Erkki Keldo
Majandus- ja tööstusminister
Majandus- ja Kommunikatsiooniministeerium
[email protected]
Suur-Ameerika 1
10122, Tallinn Meie 02.06.2026 nr 1-6.6/61
Optiliste suuruste ja elektrilise võimsuse riigietaloni kinnitamise
ja temperatuuri riigietaloni laiendamise taotlused
Lugupeetud Erkki Keldo
AS Metrosert esitab vastavalt mõõteseadusele ja majandus- ja kommunikatsiooniministri määrusele „Riigi-
ja tugietalonide valiku, kinnitamise, säilitamise ja kasutamise kord, nende säilitamiseks, arendamiseks,
kalibreerimiseks ja rahvusvaheliseks võrdlemiseks tehtavate põhjendatud kulutuste loetelu ning riigi- ja
tugietalonide nimistu“ taotlused optiliste suuruste ja elektrilise võimsuse riigietaloni kinnitamiseks ja
temperatuuri riigietaloni laiendamiseks.
Lugupidamisega
/Allkirjastatud digitaalselt/
Lauri Lillepea
Juhatuse liige
AS Metrosert
Lisad: Optiliste suuruste riigietaloni taotlus ja lisad:
1_Optiliste suuruste riigietaloni taotlus
1_1_Fiber_optic_power_meter_comparison_1310_1550_nm
1_2_Pilot Study Comparison _Final Report_A3.1.4
Elektrilise võimsuse riigietaloni taotlus ja lisad:
2_Elektrilise võimsuse riigietaloni taotlus
2_1_00 Euramet.EM-K5.2018 Comparison Report V3.6.2
Temperatuuri riigietaloni laienduse taotlus ja lisad:
3_Temperatuuri riigietaloni laienduse taotlus
3_1_K001
3_2_AG_2024_R_0014 EN_Metrosert LAB03
A pilot comparison on calibration of fiber optic power meter
Ferhat Sametoglu1, Toomas Kubarsepp2 Pedro Corredera3
1
TUBITAK UME, Gebze, Turkey, 2AS Metrosert, Tallinn, Estonia, 3IO-CSIC, Madrid, Spain,
Corresponding e-mail address:
[email protected]
A pilot comparison on the calibration of a fiber
optic power meter has been carried out between
TUBITAK UME, IO-CSIC and AS Metrosert,
within the EURAMET project “Supporting
smart specialization and stakeholder linkage in
Photometry and Radiometry (20SCP01 Smart
PhoRA). The agreed wavelengths and power
levels for comparison were 1310 nm and 1550 nm Figure 1. Comparison artefact
and 0 dBm (1 mW) and -23 dBm (5 μW),
Power sensor includes a InGaAs sensor element
respectively. TUBITAK UME piloted the
with 5 mm in diameter which covers the range from
comparison and its power meter was used as the
800 nm to 1700 nm in a power range from +3 dBm
comparison artefact. This contribution describes
to -110 dBm. The instrument has FC-adaptor in
the methodology used in the comparison, the
order to connect FC/PC fiber optic patchcord.
traceability and uncertainties of each of the
laboratories involved and the analysis of the MEASUREMENTS
results.
The measurand was the calibration factor of the
INTRODUCTION optical power over a FC/PC connector. The
calibration of the device at each the laboratory was
In 2020, European Metrology Programme for
performed at nominal laser wavelengths of 1310 nm
Innovation and Research (EMPIR) Project, Smart
and 1550 nm. The corrections in dB at each
PhoRa “Supporting smart specialization and
wavelength were determined using the following
stakeholder linkage in Photometry and Radiometry”
equation:
was started. Work package 3 (WP3) of this project is
focused on metrology for fibre optics. In this WP3,
(1)
Eesti Metroloogia Keskasutus (the NMI of Estonia
AS Metrosert) is work jointly with the DI of Spain
where Pc is the determined calibration factor, Pref is
(IO-CSIC) and NMI of Turkey (TUBITAK UME) to
the reference optical power measured using the
provide metrology for smart specialization in fibre
reference device by each the laboratory and PDUT is
optics [1]. The aim of this WP3 is to develop the
the optical power measured by the artefact.
expertise of NMIs/DIs in Estonia and Turkey to
At TUBITAK UME, Pref was measured using a
enable them to fulfil the needs of their regional
FC-adaptored InGaAs-detector, which is traceable to
industry in the field of fibre optics in the sense of a
optical power scale of PTB [2]. The best expanded
smart specialisation.
uncertainty (k = 2) with this realization is ±2.2 % (±
One of the activities of WP3 was to organise a
0.098 dB). IO-CSIC uses as reference an electrically
pilot study in spectral responsivity of fibre optics
calibrated pyroelectric radiometer (ECPR RS-5900)
detector between the tree laboratories. A commercial
traceable to the optical power scale of the IO-CSIC,
fiber optic power meter device owned by TUBITAK
with a best expanded uncertainty (k = 2) is ±1.0 %
UME was circulated between the laboratories.
(±0.043 dB) [4, 5]. On the other hand, AS Metrosert
COMPARISON ARTEFACT uses a transmission trap radiometer, consisting of
The comparison artefact was HP 8153A Lightwave two InGaAs photodiodes in polarisation independent
Multimeter having HP 81532A model of power configuration [6], traceable to the Aalto University
sensor (Fig. 1). optical power scale (the best expanded uncertainty
(k = 2) is ±5.0 % (±0.20 dB).
The laser sources used in the comparison are Table 2. Calculated En values.
the ones used by each laboratory in their regular Power level CSIC/TUBITAK CSIC/AS
protocols. TUBITAK UME used two DFB laser λ / nm
/ dBm UME Metrosert
sources with central wavelengths of 1310.0 nm and 1310.0 0,0 0,60 -0,88
1549.9 nm, IO-CSIC used two tunable lasers at 1310.0 -23,0 0,49 -0,11
1310.0 nm and 1550.0 nm, while AS Metrosert used 1549.9 0,0 -0,40 -0,37
two Fabry-Perot lasers with central wavelengths of 1549.9 -23,0 -0,49 0,26
1309.2 nm and 1545.5 nm, with 6 and 8 longitudinal
modes respectively. CONCLUSION
RESULTS & DISCUSION A pilot comparison on the calibration of fiber optic
power meter between three metrology institutes
The results of the comparison are shown in Table 1 (TUBITAK UME, IO-CSIC and AS Metrosert) is
and Fig. 2. performed within the described European project
Table 1. Correction factor and uncertainty obtained by study. In the comparison, TUBITAK UME was the
each laboratory. pilot laboratory, IO-CSIC and AS Metrosert were
Power participating laboratories. Comparison
Correction Uncertainty
Lab. λ (nm) level measurements have been completed and are under
(dB) (dB (k = 2))
(dBm) evaluation. Therefore, results obtained at agreed
1310.0 0 0.035 0.098 wavelengths and optical power levels including
TUBITAK
1310.0 -23 0.012 0.098
UME
measurement uncertainties will be presented at the
1549.9 0 -0.048 0.097
conference.
1549.9 -23 -0.045 0.097
1310.0 0 -0.029 0.043 ACKNOWLEDGEMENTS
IO-CSIC
1310.0 -23 -0.041 0.043
1550.0 0 -0.006 0.043 This project 20SCP01 SmartPhoRa has received
1550.0 -23 0.007 0.043 funding from the EMPIR programme co-financed by
1309.2 0 0.15 0.20 the Participating States and from the European
Metrosert
1309.2 -23 -0.01 0.28 Union’s Horizon 2020 research and innovation
AS
1545.5 0 0.07 0.20 programme.
1545.5 -23 -0.07 0.29
REFERENCES
1.https://www.euramet.org/research-innovation/search-
research-projects/details/project/supporting-smart-
specialisation-and-stakeholder-linkage-in-photometry-
and-radiometry
2. O. Celikel et al. Cryogenic radiometer based absolute
spectral power responsivity calibration of integrating
sphere radiometer to be used in power measurements at
optical fiber communication wavelengths, Optical and
Quantum Electronics, 37(6), 529 - 543, 2005.
3. O. Bazkir et al. Realization of relative responsivity
scale with the elctrically calibrated pyroelectric
radiometer, Optics & Laser Technology, 39(1), 189-195,
2007.
4. P Corredera et al. Comparison between absolute
thermal radiometers at wavelengths of 1300 nm and
1550 nm, Metrologia, 37, 543-546, 2000.
Figure 2. Result of the comparison, in green the average
5. P Corredera et al. Absolute power measurements at
correction weighted by the uncertainty of the laboratories. wavelengths of 1300 nm and 1550 nm with a cryogenic
The results of the comparison are compatible as shown in radiometer and a tuneable laser diode. Metrologia, 37,
Table 2, where the values of IO-CSIC have been taken as 519-522, 2000.
a reference because it is the laboratory that has an 6. A. Vaigu et al, Compact two-element transmission trap
approved CMC. detector for 1550 nm wavelength, Meas. Sci. Technol.,
26, 1-6, 2015.
Pilot Comparison
on the fiber optic power responsivity between
TUBITAK UME, IO-CSIC and AS Metrosert
Activity A3.1.4
Final Report
23 March 2023
This document was prepared by:
Ferhat Sametoglu (1) Toomas Kubarsepp (2) Pedro Corredera (3)
(1) TUBITAK UME, Gebze, Kocaeli, Turkey
(2) AS Metrosert, Tallinn, Estonia
(3) IO-CSIC, Madrid, Spain
Abstract
A pilot comparison on the calibration of a fiber optic power meter has been carried out
between TUBITAK UME, IO-CSIC and AS Metrosert, within the EURAMET project
“Supporting smart specialization and stakeholder linkage in Photometry and
Radiometry”. The agreed wavelengths and power levels for comparison were 1310 nm
and 1550 nm and 0 dBm (1 mW) and -23 dBm (5 μW), respectively. TUBITAK UME
piloted the comparison and its power meter was used as the comparison artefact.
1. Introduction
In 2020, European Metrology Programme for Innovation and Research (EMPIR)
Project, Smart PhoRa “Supporting smart specialization and stakeholder linkage in
Photometry and Radiometry” was started. Work package 3 (WP3) of this project is
focused on metrology for fibre optics. In WP3, AS Metrosert (the NMI of Estonia) ,the
DI of Spain (IO-CSIC) and NMI of Turkey (TUBITAK UME) work jointly to provide
metrology for smart specialization in fibre optics [1]. The aim of this WP3 is to develop
the expertise of NMIs/DIs in Estonia and Turkey to enable them to fulfil the needs of
their regional industry in the field of fibre optics in the sense of a smart specialisation.
One of the activities of WP3 was to organise a pilot study in spectral responsivity of
fibre optics detector between the tree laboratories. A commercial fiber optic power
meter device owned by TUBITAK UME was circulated between the laboratories.
2. Participants
The pilot of the comparison is National Metrology Institute of Türkiye (TÜBITAK UME,
Türkiye). Participants of the comparison are Instituto de Optica 'Daza de Valdés' (IO-
CSIC, Spain) and Central Office of Metrology (AS METROSERT, Estonia).
3. Comparison artefact
The comparison artefact was HP 8153A Lightwave Multimeter having HP 81532A
model of power sensor (Fig. 1).
Figure 1. Comparison artefact
The optical sensor inside the HP power meter is an InGaAs-based sensor element.
According to technical specification, the sensor size is 5 mm in diameter and covers
the range from 800 nm to 1700 nm in a power range from +3 dBm to -110 dBm (the
IO-CSIC checked the instrument and the internal sensor, probably has a 1 mm
diameter or smaller and has a temperature control probably with two stages TE cooler
to achieve a very low noise (-110 dBm)). The sensor is connected by an optical fiber
(with lens in the input) and the instrument has FC-adaptor. The optical input of the
connector is covered with a special cover to protect it from dust and unnecessary
particles. The device has a permanent identifying serial number (2946 G07109) on the
back of the instrument. Only parameter of correct wavelength should be changed by
using key “Param” on the front panel of the device. Minimum warm-up time of the
device is 15 minutes.
The correct on n dB for the compar son should be calculated by us ng the follow ng
equat on:
= − (1)
where Pref (dBm) refer to the optical power measured by the reference meter of the
participant and Ptest (dBm) refer to the optical power measured by the comparison
artefact.
4. Protocol of the comparison
TUBITAK UME prepared a draft comparison protocol on October 6, 2022 and sent it
to the participants for their evaluation. After several suggestions, the final protocol was
formed in line with the comments received on December 6, 2022. The TUBITAK UME
calibrated the power meter first at the agreed wavelengths and power levels and then
sent it to the IO-CSIC. The IO-CSIC calibrated the power meter and performed
additional measurement on the linearity of the instrument at 1550 nm in order to be
sure of possible differences between the measurements. After that IO-CSIC sent the
device to the AS Metrosert. The AS Metrosert calibrated the power meter and sent it
to the TUBITAK UME for final measurement at TUBITAK UME. The TUBITAK UME
recalibrated the power meter to check the drift during the comparison period. After this
process, the participating laboratories prepared a report containing the measurement
setup, measurement results and uncertainty budget and sent it to the pilot laboratory.
At the TUBITAK UME the measurement were done over the period 1 December 2022
– 6 December 2022 (first round) and over the period 13 February 2023 – 14 February
2023 (second round). At the IO-CSIC the measurements were done over the period
13 December 2022 - 27 December 2022. At the AS Metrosert the measurements were
done over the period 2 January 2022 - 17 January 2023.
5. Comparison measurements and results
5.1. TUBITAK UME Measurements
5.1.1 Laboratory conditions
The TUBITAK UME uses a central automation system for the control of ambient
conditions and a calibrated relative humidity and temperature meter manufactured by
TUBITAK UME (M/N: ESL1012V2, S/N: 084) was used to measure the related
parameters. The temperature and relative humidity in the calibration area have been
maintained at (23 ± 2) ºC and (45 ± 10) %rh, respectively.
5.1.2 Traceability
The TUBITAK UME uses an InGaAs detector manufactured by NPL (M/N: InGaAs and
S/N: TKIG1) as a reference in optical power measurements, which has a InGaAs
photodiode with a 5 mm diameter active area and mounted in a window-less can which
is itself mounted in a 35 mm diameter cylindrical detector housing. The generated
photocurrent at the output of the detector is converted to voltage by using a calibrated
transimpedance amplifier manufactured by VINCULUM (M/N: SP042 and S/N: SP042-
01-007) and a calibrated high-precision digital multimeter manufctured by Agilent (M/N:
3458A and S/N: US28029775) is used to measure voltage. The spectral responsivity
of the reference detector is traceable to the PTB, whereas the transimpedance
amplifier and the digital multimeter are traceable to the TUBITAK UME.
The wavelength measurements of the lasers were carried out using an optical
spectrum analyser (OSA) manufactured by Anritsu (M/N: MS9740A and S/N:
6260878459) which has an acetylene calibration cell as an internal calibration standard
that recalibrates the equipment as programmed. The TUBITAK UME does not have a
calibration service on this subject. Therefore for verification purposes, the wavelength
measurement performance of the device was checked at 1064 nm in the Time and
Frequency Laboratory of the TUBITAK UME.
5.1.3 Measurement facility and the calibration procedure
The comparison artifact was calibrated using the measurement setup showing in the
Figure 2.
Figure 2. Photograph showing the calibration setup of TUBITAK UME
DFB laser sources manufactured by Agilent (M/N: 8163B and S/N: DE42100688) with
two laser modules at 1310 nm and 1550 nm (M/N: 81663A) were used as sources in
the calibration. After the measurements were completed with the first laser (1310 nm),
the other laser (1550 nm) was used. Output of the laser source used was connected
to an optical attenuator manufactured by Agilent (M/N: 8156A and S/N: 3328 G 02645)
using the first FC/PC patchcord and output from optical attenuator connected to the
reference detector using the second FC/PC patchcord. All tips of patchcords have been
carefully cleaned before connection. After stabilization period of all electronic devices,
the power level of 1 mW (0 dBm) was aligned by using the reference system by using
the obtained voltage, gain of the transimpedance amplifier and the spectral
responsivity of the reference detector in unit of mW and then mathematically converted
to the unit of dBm. During voltage measurement, both the number of reading and the
number of power line cycles of the digital multimeter were set to 50. The measurements
repeated 10 times. After this process, the fiber optic patchcord was disconnected from
the reference detector and connected to the calibrated device and 10 measurements
were made. The same measurements were repeated for the second agreed power
level, 0,005 mW (-23 dBm).
The same operations were performed for the wavelength of 1550 nm.
Table 1 gives the summary of results and uncertainties.
Table 1. Calibration results and uncertainties of TUBITAK UME
Optical Optical power
Wavelength power DUT Correction Uncertainty
(nm) Reference (dBm) (dB) k=2
(dBm)
1310.0 nm 0,002 -0,033 0,035 0,098
1310.0 nm -23,01 -23,02 0,012 0,098
1549.9 nm 0,018 0,066 -0,048 0,097
1549.9 nm -23,00 -22,96 -0,045 0,097
Figures 3 shows the results of the lasers measured by OSA.
Figures 3. Measurement results of the laser sources with a wavelength of 1310 nm
(left side) and 1550 nm (right side).
5.1.4 Uncertainty budget
The calibration uncertainty at agreed wavelengths and power levels are given in Table
1 and detailed uncertainty budgets at 1310 nm and 1550 nm wavelengths are shown
from Table 2 to Table 5.
Table 2. Uncertainty budget at 1310 nm wavelength and 0 dBm power level
# Quantity, Estimate, standard sensitivity uncertainty
Xi xi uncertainty, coefficient, contribution,
u(xi) ci ui(y)
Reference power measurement
1 Measured voltage 10,25782 V 0,00229 V 9,76·10-5 W/V 5,01·10-14 W2
2 Calibration factor of DMM 0,001162 V 0,000020 V -9,76·10-5 W/V 3,81·10-18 W2
3 Transimpedance gain 10001 V/A 0,5 V/A -1,00·10-14 2,50·10-15 W2
(A*W2)/V
4 Spectral responsivity of 1,025 A/W 0,010 A/W -9,76·10-4 W2/A 1,00·10-10 W2
detector
5 Annual drift of the detector 0 0,001 A/W 9,76·10-4 W2/A 9,53·10-13 W2
responsivity
6 Laser stability 0 0,003 1,00·10-3 W 7,85·10-12 W2
7 Connection repeatability 0 0,004 1,00·10-3 W 1,85·10-11 W2
Measured reference power 1,00 mW k=1 0,011 mW
k=2 0,023 mW
1 Measured reference power 0,002 dBm 0,049 dBm 1 dBm 2,38·10-3 dB2
2 Measured power (artefact) -0,033 dBm 0,003 dBm -1 dBm 8,55·10-6 dB2
Calculated correction (Eq.1) 0,035 dB k=1 0,049 dB
k=2 0,098 dB
Table 3. Uncertainty budget at 1310 nm wavelength and -23 dBm power level
# Quantity, Estimate, standard sensitivity uncertainty
Xi xi uncertainty, coefficient, contribution,
u(xi) ci ui(y)
Reference power measurement
1 Measured voltage 0,512404 6,20·10-5 V 9,76·10-6 W/V 3,66·10-19 W2
V
2 Calibration factor of DMM 0,0001690 V 1,00·10-6 V -9,76·10-6 W/V 9,52·10-23 W2
3 Transimpedance gain 99974 V/A 5,0 V/A -5,00·10-11 6,25·10-20 W2
(A*W2)/V
4 Spectral responsivity of 1,025 A/W 0,010 A/W -4,88·10-6 W2/A 2,50·10-15 W2
detector
5 Annual drift of the detector 0 0,001 A/W 4,88·10-6 W2/A 2,38·10-17 W2
responsivity
6 Laser stability 0 0,003 5,00·10-6 W 2,56·10-16 W2
7 Connection repeatability 0 0,004 5,00·10-6 W 4,00·10-16 W2
Measured reference power 0,005 mW k=1 0,000056 mW
k=2 0,00011 mW
1 Measured reference power -23,011 dBm 0,049 dBm 1 dBm 2,37·10-3 dB2
2 Measured power (artefact) -23,023 dBm 0,003 dBm -1 dBm 7,61·10-6 dB2
Calculated correction (Eq.1) 0,012 dB k=1 0,049 dB
k=2 0,098 dB
Table 4. Uncertainty budget at 1550 nm wavelength and 0 dBm power level
# Quantity, Estimate, standard sensitivity uncertainty
Xi xi uncertainty, coefficient, contribution,
u(xi) ci ui(y)
Reference power measurement
1 Measured voltage 11,3387 V 0,00104 V 8,86·10-5 W/V 8,40·10-15 W2
2 Calibration factor of DMM 0,001162 V 0,000020 V -8,86·10-5 W/V 3,14·10-18 W2
3 Transimpedance gain 10001 V/A 0,5 V/A -1,00·10-7 2,52·10-15 W2
(A*W2)/V
4 Spectral responsivity of 1,129 A/W 0,011 A/W -8,89·10-4 W2/A 1,01·10-10 W2
detector
5 Annual drift of the detector 0 A/W 0,001 A/W 8,89·10-4 W2/A 7,91·10-13 W2
responsivity
6 Laser stability 0 0,003 1,00·10-3 W 9,07·10-12 W2
7 Connection repeatability 0 0,004 1,00·10-3 W 1,16·10-11 W2
Measured reference power 1,00 mW k=1 0,011 mW
k=2 0,023 mW
1 Measured reference power 0,018 dBm 0,049 dBm 1 dBm 2,37·10-3 dB2
2 Measured power (artefact) 0,066 dBm 0,003 dBm -1 dBm 8,55·10-6 dB2
Calculated correction (Eq.1) -0,048 dB k=1 0,049 dB
k=2 0,097 dB
Table 5. Uncertainty budget at 1550 nm wavelength and -23 dBm power level
# Quantity, Estimate, standard sensitivity uncertainty
Xi xi uncertainty, coefficient, contribution,
u(xi) ci ui(y)
Reference power measurement
1 Measured voltage 0,565728 V 3,31·10-5 V 8,86·10-6 W/V 8,58·10-20 W2
2 Calibration factor of DMM 0,0001690 V 1,00·10-6 V -8,86·10-6 W/V 7,85·10-23 W2
3 Transimpedance gain 99974 V/A 5,0 V/A -5,01·10-11 6,28·10-20 W2
(A*W2)/V
4 Spectral responsivity of 1,129 A/W 0,011 A/W -4,44·10-6 W2/A 2,51·10-15 W2
detector
5 Annual drift of the detector 0 A/W 0,001 A/W 4,44·10-6 W2/A 1,97·10-17 W2
responsivity
6 Laser stability 0 0,003 5,01·10-6 W 2,26·10-16 W2
7 Connection repeatability 0 0,004 5,01·10-6 W 4,02·10-16 W2
Measured reference power 0,005 mW k=1 0,000056 mW
k=2 0,00011 mW
1 Measured reference power -23,001 dBm 0,048 dBm 1 dBm 2,35·10-3 dB2
2 Measured power (artefact) -22,956 dBm 0,003 dBm -1 dBm 7,61·10-6 dB2
Calculated correction (Eq.1) -0,045 dB k=1 0,049 dB
k=2 0,097 dB
5.2. IO-CSIC Measurements
5.2.1. Laboratory conditions
A calibrated thermo-hygrometer (DELTA OHM (M/N: HD2101-1R and S/N: 13038962)
with a temperature & relative humidity sensor (Sicram (M/N: RH-Pt100 and S/N:
13042304) was used for temperature measurements. The temperature and relative
humidity in the calibration area has been maintained at (23 ± 2) ºC and (25 ± 5) %rh,
respectively
5.2.2. Traceability
An electrically calibrated pyroelectric radiometer (ECPR) was used as a reference
radiometer in the measurements. The ECPR is manufactured by LASER PROBE (M/N:
Rs-5900/RsP-590 and S/N: 045-121-003) and use a chopper in the normal operation
(M/N: CtX-515 and S/N: 041-133-002/041-002-001). The ECPR is traceable to the
standard cryogenic radiometer of the IO-CSIC and the Si trap detectors at the
wavelength of 633 nm. The responsivity value of the radiometer at this wavelength and
the corrections for IR wavelengths due to the change in absorbance of the black
coating of the radiometer are taken into account in its IR responsivity used in this
report. The recognized uncertainty in CMC for optical fiber power meters of IO-CSIC
is ± 1 % (± 0,043 dB) [2, 3].
Wavelength measurements of the lasers used were carried out by using an
interferometric wavelength meter manufactured by EXFO (M/N: WA-1650 and S/N:
352391). The recognized uncertainty in CMC is 3 pm.
5.2.3. Measurement facility and the calibration procedure
The calibration of the calibration artefact was done directly by comparison with the
ECPR in the setup shown in the Figure 4.
Figure 4. The calibration setup of the IO-CSIC
The whole assembly is made on single mode 10/125 µm optical fiber (SMF-28), the
collimators allow the light to be taken out of the fiber to make it possible to use the
ECPR chopper. The connectors used on the ECPR and the PM test are FC-PC. By
modifying the collimation, optical power levels at each wavelength were selected to the
required values of 0 dBm and -23 dBm, respectively.
The lasers used for the calibration are two tunable lasers manufactured by EXFO
Tunincs XS (M/N: 3642 HE-1300 and S/N 1010262) for 1310 nm, and EXFO (M/N:
T100S-HP-CLU+EWT and S/N: EO19440032) for 1550 nm. The spectra of the lasers
used for the calibration are shown in the Figure 5.
Figure 5. The spectra of the lasers used for the calibration.
The measurements were performed after careful cleaning of the fiber optic connectors
and selection of the desired power levels at each wavelength. Before starting the
measurements, the wavelength was selected in the calibration artefact (PM Test) and
the equipment was zeroing as well as the ECPR. The measurements were taken after
10 connections and disconnections of the fiber optic connector alternately between the
ECPR and the calibrated artefact. Between measurements, the movement of the
chopper was stopped and waited to ensure that it did not interrupt the optical path. The
calibration results are given in Table 6.
Table 6. Summary of calibration results of the IO-CSIC
Uncertainty Optical Optical Correcti Uncertainty
Wavelength
k=2 Power Power on k=2 Uncertainty
FC
k=2
λ/nm λ/nm Pref/dBm Pref/mW dB dB
1310,0000 0,0030 0,06 1,014 -0,029 0,043 0,9934 0,0099
1310,0000 0,0030 -23,00 0,005 -0,041 0,043 0,9907 0,0099
1550,0060 0,0030 0,05 1,012 -0,006 0,043 0,999 0,010
1550,0060 0,0030 -22,95 0,005 0,007 0,043 1,002 0,010
FC is calculated using the following equation:
Pref (mW )
FC = (2)
PTEST (mW )
Additional measurement on the linearity of the power meter between +3 dBm and -24 dBm
levels has been performed by the stimulus additive method at 1550 nm wavelength [4,5]. The
results are shown in the Table 7 and Figure 6.
Table 7. Linearity measurement results
Optical Optical
NL Uncertainty NL Uncertainty
Power Power
(dBm) (W) (dB) (dB) (k = 2) (k = 2)
3,04 2,016·10-3 0,0482 0,0020 1,0112 0,0005
-0,01 9,975·10-4 0,0000 0,0020 1,0000 0,0005
-3,02 4,988·10-4 0,0003 0,0020 1,0001 0,0005
-6,02 2,498·10-4 0,0006 0,0028 1,0001 0,0007
-9,04 1,248·10-4 0,0019 0,0035 1,0004 0,0008
-12,04 6,255·10-5 0,0022 0,0040 1,0005 0,0009
-15,05 3,125·10-5 0,0035 0,0045 1,0008 0,0010
-18,05 1,566·10-5 0,0033 0,0049 1,0008 0,0011
-21,06 7,836·10-5 0,0041 0,0053 1,0010 0,0012
-24,06 3,931·10-5 0,0054 0,0057 1,0013 0,0013
Between +3 dBm and 0 dBm it shows a non-linearity jump of 1%, probably due to a change in
the analogue-to-digital converter, although the PM test shows a good linearity between the
values of 0 dBm and -23 dBm with a cumulative non-linearity of less than 1.0013 ± 0.0013 on
the calibration factor and (0.0054 ± 0.0057) dB on the correction. In any cases this non-linearity
correction factor are smaller than the uncertainty of the absolute correction factor.
0.060
0.050
Non-linearyty (dB)
0.040
0.030
0.020
0.010
0.000
-0.010
-30 -20 -10 0 10
Optical Power (dBm)
Figure 6. Linearity of the comparison artifact at 1550 nm wavelength.
5.2.4. Uncertainty budget
The calibration uncertainty at agreed wavelengths and power levels are given in Table
6 and detailed uncertainty budgets at 1310 nm and 1550 nm wavelengths are shown
from Table 8 to Table 11.
Table 8. Uncertainty budget at 1310 nm wavelength and 0 dBm power level
DETAILED UNCERTAINTIES
Contribution
Standard Type of Degrees of Sensitivity to
Magnitude Symbol Value uncertainty assessment freedom coefficient uncertainty
X x u(x) n c u(y)
Standard reading PS(λ ) 1,0151E-03 6,11E-07 A 9 979 5,979E-04
Standard resolution δ PS(λ ) 0,0000 2,89E-07 B 100 979 2,825E-04
Responsivity KS(λ ) 0,9988 3,78E-03 B 100 1 3,764E-03
Drift of standard δ KS(λ ) 0,0000 1,15E-03 B 100 1 1,147E-03
Test reading PX(λ ) 1,0231E-03 6,16E-07 A 9 971 5,979E-04
Test resolution δ PX(λ ) 0,0000 2,89E-07 B 100 971 2,803E-04
Calibration Factor KX(λ ) 0,9934 n ef 5,000E+05 3,990E-03
k= 2,0000
Calibration Factor (k=2) KX(λ ) 0,9934 0,0080
Calibration Factor (CMC) KX(λ ) 0,9934 0,0099
Table 9. Uncertainty budget at 1310 nm wavelength and -23 dBm power level
DETAILED UNCERTAINTIES
Contribution
Standard Type of Degrees of Sensitivity to
Magnitude Symbol Value uncertainty assessment freedom coefficient uncertainty
X x u(x) n c u(y)
Standard reading PS(λ ) 5,0260E-06 9,80E-09 A 9 197113 1,931E-03
Standard resolution δ PS(λ ) 0,0000 2,89E-09 B 100 197113 5,690E-04
Responsivity KS(λ ) 0,9988 3,78E-03 B 100 1 3,754E-03
Drift of standard δ KS(λ ) 0,0000 1,15E-03 B 100 1 1,144E-03
Test reading PX(λ ) 5,0795E-06 9,90E-09 A 9 195036 1,931E-03
Test resolution δ PX(λ ) 0,0000 2,89E-09 B 100 195036 5,630E-04
Calibration Factor KX(λ ) 0,9907 n ef 5,000E+05 4,410E-03
k= 2,0000
Calibration Factor (k=2) KX(λ ) 0,9907 0,0088
Calibration Factor (CMC) KX(λ ) 0,9907 0,0099
Table 10. Uncertainty budget at 1550 nm wavelength and 0 dBm power level
DETAILED UNCERTAINTIES
Contribution
Standard Type of Degrees of Sensitivity to
Magnitude Symbol Value uncertainty assessment freedom coefficient uncertainty
X x u(x) n c u(y)
Standard reading PS(λ ) 1,0122E-03 1,53E-06 A 9 987 1,507E-03
Standard resolution δ PS(λ ) 0,0000 2,89E-07 B 100 987 2,848E-04
Responsivity KS(λ ) 0,9988 3,78E-03 B 100 1 3,784E-03
Drift of standard δ KS(λ ) 0,0000 1,15E-03 B 100 1 1,153E-03
Test reading PX(λ ) 1,0148E-03 1,53E-06 A 9 984 1,507E-03
Test resolution δ PX(λ ) 0,0000 2,89E-07 B 100 984 2,841E-04
Calibration Factor KX(λ ) 0,9987 n ef 5,000E+05 4,243E-03
k= 2,0000
Calibration Factor (k=2) KX(λ ) 0,9987 0,0085
Calibration Factor (CMC) KX(λ ) 0,999 0,010
Table 11. Uncertainty budget at 1550 nm wavelength and -23 dBm power level
DETAILED UNCERTAINTIES
Contribution
Standard Type of Degrees of Sensitivity to
Magnitude Symbol Value uncertainty assessment freedom coefficient uncertainty
X x u(x) n c u(y)
Standard reading PS(λ ) 5,0710E-06 9,80E-09 A 9 197536 1,935E-03
Standard resolution δ PS(λ ) 0,0000 2,89E-09 B 100 197536 5,702E-04
Responsivity KS(λ ) 0,9988 3,78E-03 B 100 1 3,796E-03
Drift of standard δ KS(λ ) 0,0000 1,15E-03 B 100 1 1,157E-03
Test reading PX(λ ) 5,0687E-06 9,79E-09 A 9 197627 1,935E-03
Test resolution δ PX(λ ) 0,0000 2,89E-09 B 100 197627 5,705E-04
Calibration Factor KX(λ ) 1,0017 n ef 5,000E+05 4,452E-03
k= 2,0000
Calibration Factor (k=2) KX(λ ) 1,0017 0,0089
Calibration Factor (CMC) KX(λ ) 1,002 0,010
5.3. AS Metrosert Measurements
5.3.1. Laboratory conditions
A thermo-hygrometer from Rotronic S/N A190303825 calibrated by AS Metrosert was
used to record laboratory conditions. The temperature and relative humidity in the
calibration area has been maintained as (20.0 - 20.6) ºC and (24 -28) %rh, respectively.
5.3.2. Traceability
In the measurements the photodetector 2XIGA [6] was used as a reference detector
whose spectral responsivity is traceable to Aalto University. The photocurrent of the
detector was measured by using the digital multimeter type 1281 from Wavetek S/N
45019 which is traceable to national standard of electrical quantities of AS Metrosert.
The wavelengths of the lasers (type LPS-1310-FC, S/N 220620-21 and type LPS-
1550-FC, S/N 22030-18 both from Thorlabs) were not measured, the datasheets
provided by the manufacturer was used instead.
5.3.3. Measurement facility and the calibration procedure
The measurement set-up used in the measurement at AS Metrosert is depicted in
Figure 7.
Figure 7. The measurement set-up used for the pilot study on the fiber optic
power meter calibration at AS Metrosert.
In the measurements the photodetector 2XIGA was used as a reference detector. The
photodetector includes two InGaAs-photodiodes type G8370-10 (windowless) from
Hamamatsu. The configuration of photodiodes in the detector is insensitive to the
polarization state of incoming beam [6].
As the light sources two diode lasers from Thorlabs were used
a) CWL λ=1309.2 nm, bandwidth Δλ not specified, number of longitudinal
modes 6 (manufacturer specifications) (Figure 8)
b) CWL λ =1545.5 nm, bandwidth Δλ not specified, number of modes 8
(manufacturer specifications) (Figure 9)
Figure 8. The spectra of the laser Thorlabs 220620-21 (1310 nm) at 20,5 mA.
Figure 9. The spectra of the laser Thorlabs 220330-18 (1550 nm) at 23,1 mA.
The lasers’ current and temperature assembled in LD/TEC mount for Thorlabs Fiber-
Pigtailed Laser Diodes model LDM9LP were set by using current driver LDC202C (S/N
M00834933) and temperature controller TEC200C (S/N M00657257), both from
Thorlabs. In the measurements with photodetector 2XIGA, the collimators model
F240FC-C and model F240FC-1550 were used with the lasers at the wavelengths
1309.2 nm and 1545.5 nm, respectively.
The photocurrent from the detector 2XIGA was recorded by using digital multimeter
Wavetek 1281.
The device under test (the comparison artefact) was powered on and let to warm up
for 1 hour before start of measurements. Only parameter of correct wavelength was
changed by using key “Param” on the front panel of DUT.
The measurements were performed in cycles. The sequence in the measurement
cycle was:
a) Optical power measurement with reference detector with collimator attached to
the fiber laser output;
b) Optical power measurement with DUT without collimator attached to the fiber
laser output;
c) Optical power measurement with reference detector with collimator attached to
the fiber laser output.
In total, 10 measurement cycles were conducted at each laser wavelength and each
optical power level.
Table 12 gives the summary of results and uncertainties.
Table 12. Calibration results and uncertainties of AS Metrosert
Optical Calibration Type A Type B Total
Wavelength power Factor Standard Standard Expanded
(nm) (correction / Uncertainty Uncertainty Uncertainty
(dBm)
dB) (a) (k=1) (b) (k=1) (c) k=2 (d)
1309,2 -23 -0,01 0,13 0,05 0,28
-20 0,06 0,10 0,05 0,22
-10 0,06 0,11 0,05 0,24
0 0,15 0,09 0,05 0,20
1545,5 -23 -0,07 0,12 0,08 0,29
-20 -0,01 0,13 0,05 0,27
-10 0,08 0,09 0,05 0,22
0 0,07 0,08 0,05 0,20
5.3.4. Uncertainty budget
The calibration uncertainty at agreed wavelengths and power levels are given in Table
12 and the detailed uncertainty budgets at 1310 nm and 1550 nm wavelengths are
shown in Tables 13- 16.
Table 13. Uncertainty budget at 1310 nm wavelength and 0 dBm power level
Reference Value Standard Unit PDF Standard uncertainty
deviation contribution, dB
Calibration of responsivity 0,9646 0,0193 mA/mW Normal -0,087
Aging 0 0,0096 mA/mW Uniform -0,013
Spatial uniformity 0 0,0193 mA/mW Uniform -0,025
Effect of collimator 0 0,0019 mA/mW Uniform -0,005
Fibre connection 0 0,008 dB Uniform 0,005
DMM calibration 0 1 µA Normal -0,005
DMM reading 919,69 1,46E+00 µA Normal -0,007
DMM resolution 0 0,01 µA Uniform -0,00001
LD stability 0 0,010 - Uniform -0,013
LD wavelength 0 0,2 nm Uniform 0,0007
Calibrated power meter
Reading -0,36 0,004 dBm Normal 0,004
Resolution 0,001 dBm Uniform 0,0003
Fibre connection 0,120 dBm Uniform 0,035
Combined standard uncertainty
Type A 0,087
Type B 0,047
Total (k=1) 0,099
Expanded uncertainty (k=2) 0,20
Table 14. Uncertainty budget at 1310 nm wavelength and -23 dBm power level
Reference Value Standard Unit PDF Standard uncertainty
deviation contribution, dB
Calibration of responsivity 0,9646 0,0193 mA/mW Normal -0,087
Aging 0 0,0096 mA/mW Uniform -0,013
Spatial uniformity 0 0,0193 mA/mW Uniform -0,025
Effect of collimator 0 0,0019 mA/mW Uniform -0,005
Fibre connection 0 0,008 dB Uniform 0,005
DMM calibration 0 0,1 µA Normal -0,096
DMM reading 4,52 1,57E-02 µA Normal -0,015
DMM resolution 0 0,01 µA Uniform -0,00277
LD stability 0 0,010 - Uniform -0,013
LD wavelength 0 0,2 nm Uniform 0,0007
Calibrated power meter
Reading -23,42 0,012 dBm Normal 0,012
Resolution 0,001 dBm Uniform 0,0003
Fibre connection 0,120 dB Uniform 0,035
Combined standard uncertainty
Type A 0,131
Type B 0,047
Total (k=1) 0,140
Expanded uncertainty (k=2) 0,28
Table 15. Uncertainty budget at 1550 nm wavelength and 0 dBm power level
Reference Value Standard Unit PDF Standard uncertainty
deviation contribution, dB
Calibration of responsivity 1,146 0,0184 mA/mW Normal -0,069
Aging 0 0,0115 mA/mW Uniform -0,013
Spatial uniformity 0 0,0229 mA/mW Uniform -0,025
Effect of collimator 0 0,0023 mA/mW Uniform -0,005
Fibre connection 0 0,002 dB Uniform 0,001
DMM calibration 0 1 µA Normal -0,004
DMM reading 1162,1 9,4E+00 µA Normal -0,035
DMM resolution 0 0,01 µA Uniform -0,00001
LD stability 0 0,020 - Uniform -0,025
LD wavelength 0 0,2 nm Uniform 0,0006
Power meter
Reading -0,018 0,024 dBm Normal 0,024
Resolution 0,001 dBm Uniform 0,0003
Fibre connection 0,120 dBm Uniform 0,035
Combined standard uncertainty
Type A 0,082
Type B 0,051
Total (k=1) 0,097
Expanded uncertainty (k=2) 0,20
Table 16. Uncertainty budget at 1550 nm wavelength and -23 dBm power level
Reference Value Standard Unit PDF Standard uncertainty
deviation contribution, dB
Calibration of responsivity 1,146 0,0229 mA/mW Normal -0,087
Aging 0 0,0115 mA/mW Uniform -0,013
Spatial uniformity 0 0,0229 mA/mW Uniform -0,025
Effect of collimator 0 0,0023 mA/mW Uniform -0,005
Fibre connection 0 0,002 dB Uniform 0,001
DMM calibration 0 0,1 µA Normal -0,077
DMM reading 5,61 2,2E-02 µA Normal -0,017
DMM resolution 0 0,01 µA Uniform -0,00223
LD stability 0 0,02 - Uniform -0,025
LD wavelength 0 0,2 nm Uniform 0,0006
Calibrated power meter
Reading -23,15 0,021 dBm Normal 0,021
Resolution 0 0,001 dBm Uniform 0,0003
Fibre connection 0 0,120 dBm Uniform 0,069
Combined standard uncertainty
Type A 0,119
Type B 0,079
Total (k=1) 0,143
Expanded uncertainty (k=2) 0,29
6. Results and conclusion
A pilot comparison on the calibration of fiber optic power meter between three metrology
institutes (TUBITAK UME, IO-CSIC and AS Metrosert) is performed within the described
European project study. In the comparison, TUBITAK UME was the pilot laboratory, IO-CSIC
and AS Metrosert were participating laboratories. The comparison results of three participants
at agreed wavelengths and power levels are shown in Table 17 and Figure 10 [7]. Ratios of
IO-CSIC to TUBITAK UME and IO-CSIC to AS Metrosert were used in the calculations. As can
be seen from the figure, there are good agreement between the results at both wavelengths.
Table 17. Correction factor and uncertainty obtained by each laboratory
LAB. λ Power level Correction Uncertainty
(nm) (dBm) (dB) (dB (k = 2))
1310.0 0 0,035 0,098
TUBITAK UME 1310.0 -23 0,012 0,098
1549.9 0 -0,048 0,097
1549.9 -23 -0,045 0,097
1310.0 0 -0,029 0,043
1310.0 -23 -0,041 0,043
IO-CSIC
1550.0 0 -0,006 0,043
1550.0 -23 0,007 0,043
1309.2 0 0,15 0,20
1309.2 -23 -0,01 0,28
AS Metrosert
1545.5 0 0,07 0,20
1545.5 -23 -0,07 0,29
Figure 10. Comparison results showing the correction (dB) versus optical power
measurements at 0 dBm and - 23 dBm of three participants at 1310 nm and 1550 nm
wavelengths
References
1. https://www.euramet.org/research-innovation/search-research-
projects/details/project/supporting-smart-specialisation-and-stakeholder-linkage-in-
photometry-and-radiometry
2. P Corredera et al. Comparison between absolute thermal radiometers at wavelengths
of 1300 nm and 1550 nm, Metrologia, 37, 543-546, 2000.
3. P Corredera et al. Absolute power measurements at wavelengths of 1300 nm and 1550
nm with a cryogenic radiometer and a tuneable laser diode. Metrologia, 37, 519-522,
2000
4. Corredera P, Hernanz M L, Campos J, Fontecha J L, Pons A and Corrons A Application
of an addition method to obtain the non-linearity of optical fibre instrumentation. OFMC
’97 Conf. Digest (NPL, Teddington) pp 146–9, 1997
5. P Corredera, ML Hernanz, M González-Herráez, J Campos. Anomalous non-linear
behaviour of InGaAs photodiodes with overfilled illumination, Metrologia 40 (1), S150,
2004
6. Aigar Vaigu et al 2015 Meas. Sci. Technol. 26 055901, DOI 10.1088/0957-
0233/26/5/055901
7. F.Sametoglu, T. Kubarsepp, P.Corredera. A pilot comparison on calibration of fiber
optic power meter. 15th International Conference on New Developments and
Applications in Optical Radiometry (NEWRAD 2023), 11-15 September 2023, NPL,
Teddington, UK.
Optiliste suuruste jälgitavusahel, mõõte- ja abivahendeid ning etalone
iseloomustavate metroloogiliste parameetrite, laboriruumi ja personali kirjeldus
1. Sissejuhatus ..................................................................................................................................... 1
2. Optiliste suuruste riigietaloni mõõtevõime ........................................................................................ 2
2. Optiliste suuruste riigietaloni jälgitavusahel ....................................................................................... 2
3. Optiliste suuruste riigietaloni mõõte- ja abivahendid ......................................................................... 4
3.1 Mõõtevahendid ühiku säilitamisel ja edastamisel ........................................................................ 4
3.2 Abivahendid ................................................................................................................................... 5
4. Etaloni metroloogilisi omadusi tõendavad dokumendid .................................................................... 7
5. Optiliste suuruste riigietaloni laboriruum ........................................................................................... 7
6. Optiliste suuruste riigietaloni säilitamise, kasutamise ja arendamisega seotud personal ................. 7
7. Optiliste suuruste riigietaloni säilitamise, kasutamise ja arendamise tasuvusanalüüs ...................... 7
1. Sissejuhatus
Optiliste suuruste riigietaloni tasemel mõõtmisvõime on tarvilik eeldus kõrgel tasemel
rakendusuuringutele ja metroloogiliste teenuste arendamiseks valdkondades nagu autonoomsed
sõidukid, kvantside, säästvate LED-valgusallikate kasutamine, sensor- ja materjalitehnoloogia.
Optiliste suuruste mõõtevõime tagamine riigietaloni tasemel kindlustab, et oleme Eestis võimelised
testima uut tehnoloogiat näiteks kaitsetööstuses või turvaliste sidelahenduste juurutamisel. Optiliste
suuruste riigietaloni arendamise käigus on muu hulgas töötatud välja või laiendatud järgmisi
teenuseid:
• Optiliste mõõtevahendite kalibreerimisteenus (teenus arendatud, akrediteerimisel), näiteks
kiudoptilisi mõõtevahendeid kasutavad telekommunikatsiooniettevõtted ja
elektroonikatööstus.
• Meditsiinivaldkonna optiliste seadmete toimimise katsetused – AS Metrosert on
hetkeseisuga võimeline seadmeid (näiteks kosmeetilisteks protseduurideks kasutatavad
laserid) teatud ulatuses laboris kontrollima,
• Kvantkommunikatsiooni võrgu seadmete ja võrgu testimine: teadus- ja arendusprojektide
raames on arendatud välja võimekus testida kvantvõtmejaotusseadmete (QKD) allikate
kvaliteeti.
Optiliste suuruste riigietaloni arendusprojekti käigus ja sellega kaasnenud võimekuse ülesehitamise
tulemusena on Metrosert osalenud järgnevates teadus- ja arendusprojektides, mis on panustanud
kas mõõtevõime või siis teenuste arendusse:
1. SEQUME – mõõtevõime arendamine üksikute footonite tasemeni.
2. EstQCI – kvantvõtmejaotusseadmete testimisvõimekuse arendamine
3. S-CALe UP - etalondetektori arendamine ultravioleti (250…400) nm ja lähedase infrapuna
(800…1000) nm lainepikkuste piirkondadesse madala määramatusega.
4. NEWSTAND - spektraalse kiiritustiheduse etalonallika arendamine, et katta lai lainepikkuste
vahemik 250 nm kuni 2500 nm.
5. NoQTeS - jälgitavate mõõtmis- ja karakteriseerimismeetodite väljatöötamine
kvantsensortehnoloogiate jaoks, mis on vajalikud teemandi värvitsentritel põhinevate
seadmete standardimise toetamiseks.
Optiliste suuruste riigietaloni tasemel mõõtevõime hoidmine ja jätkuv arendamine tagab, et Eestis on
olemas eeldused edasiseks teadus- ja arendustegevuseks erinevatel optilise võimsuse tasemetel, sh
madalatel valgusvoogudel põhinevate tehnoloogiate (nt kvanttehnoloogilised rakendused)
arendamiseks ja ettevõtete vastavasuunalise teadus- ja arendustegevuse toetamiseks. Jätkuv edasine
teadus- ja arendustegevus ja rahvusvahelise koostöö madalate footonvoogude mõõtmiste jälgitavuse
tagamiseks on oluline, sest rahvusvaheliselt puuduvad selleks veel standardsed alused.
Riigi- ja tugietalonide nimistu kehtestab valdkonna eest vastutav minister määrusega. Hetkel kehtivas
määruses on optilised suurused esindatud tugietalonina.
1
2. Optiliste suuruste riigietaloni mõõtevõime
Taotletav etalon on järgmistele optilistele suurustele:
Mõõdetav suurus Mõõtepiirkond Kalibreerimis- ja mõõtevõime, U(k=2)
(5...15) lx 5,0%
Valgustustihedus (15…2000) lx 2,3%
(>2000...5000) lx 5,0%
(3,0…0,5)%; =(400…450) nm,
(0,22...0,71) A/W 0,5%; =(450…750) nm
(0,5…2)%; =(750…950) nm
Spektraalne
tundlikkus*
(0,8…1,55) A/W 5%; =1310 nm, 1550 nm
kus tähistab valguse lainepikkust
*Optilise võimsuse vahemik 1 W...1 mW.
2. Optiliste suuruste riigietaloni jälgitavusahel
Riigietaloniga sooritatavate mõõtetulemuste jälgitavus rahvusvahelise SI süsteemiga on tagatud
etalonluksmeetrite ja etalondetektorite kalibreerimisega primaaretaloni suhtes Euroopa
metroloogiainstituutides. Nendeks on hetkel etalonluksmeetri ja infrapunase piirkonna
etalondetektori puhul Hispaania metroloogiainstituut IO-CSIC, LED-etalonallika puhul Saksamaa
metroloogiainstituut PTB ja nähtava piirkonna etalondetektori puhul Soome metroloogiainstituut
MIKES/AALTO. Optiliste suuruste riigietaloni jälgitavusahel on illustreerituna esitatud allpool.
2
Optiliste suuruste riigietaloni sooritatavate mõõtetulemuste jälgitavus valgustustiheduse mõõtmistel
on tõendatud Eesti Akrediteerimiskeskuse poolt. Spektraalse tundlikkuse jälgitavus on tagatud
nähtavas piirkonnas MIKES-Aalto referentsdetektori kaudu ja infrapunases piirkonnas lainepikkustel
1310 nm ja 1550 nm on võimekus leidnud kinnitust rahvusvahelisel võrdlusmõõtmisel.
3
3. Optiliste suuruste riigietaloni mõõte- ja abivahendid
3.1 Mõõtevahendid ühiku säilitamisel ja edastamisel
Etalon Tüüp Nr Mõõtepiirkond Laiendmääramatus Kalibreeritud Kalibreerija
1 2 3 4 5 6 7
PRC Krochmann
Etalonluksmeeter 150320 / 150320 (0,3...5000) lx 0,8 % 10.2024 IO-CSIC
RadioLux 111
342,19 cd 0,76 %
LED-etalonallikas LIS-A OS40005A09 07.2025 PTB
16,278 cd 0,87 %
Etalondetektor (ränipõhine) MET S03-S1337 2311011 (0,22...0,71) A/W (0,051...0,098)% 03.2026 Aalto
(0,010...0,012) A/W
Etalondetektor (InGaAs-
2XIGA 2305001 (0,8…1,55) A/W =1310 nm, 1550 nm, 07.2023 IO-CSIC
põhine)
1625 nm
4
3.2 Abivahendid
Mõõtevahend Tüüp Nr Mõõtepiirkond Laiendmääramatus Kalibreeritud Kalibreerija
1 2 3 4 5 6 7
Fotomeetriline pink ФС-M-4.1 782045 kuni 3 m - - -
(0…125) V
Toiteallikas PTN 125-1 4145 17530 - - -
(0…1) A
6A
Lamp-valgusallikas Wi41/G - - -
31 V
(0…120) V - - -
Toiteallikas Agilent 6675A MY41001713
(0…18) A
400…2300 nm,
NKTP superkontiinum laser SuperK FIANIUM K0128672 - - -
FIU-6 PP 150 kHz - 78 MHz
Selekteeriv lainepikkuste LLTF CONTRAST SR-
VIS-HP8-HF2-F12M- M000011019 (400…1000) nm
filter
NKTP
Selekteeriv lainepikkuste
(1000…2300) nm
filter
Laser LPS-1310-FC 220620-21 1309,2 nm - - -
Laser LPS-1550-FC 220330-18 1545,5 nm - - -
Laser LDH-D-C-690 010470088 689 nm
Laser PIL1-155-40FC 1160 1550 nm, kuni 40MHz
5
Ampermeeter B2987B MY61390201 2 pA…20 mA 1·10-4 pA...3,9·10-4 mA 16.04.2026 Metrosert
Ampermeeter B2981B MY61390220 2 pA…20 mA 1·10-4 pA...3,9·10-4 mA 20.04.2026 Metrosert
100 nA…2 mA,
Multimeeter Wavetek 1281 45019
0.1 V…100 V
6
4. Etaloni metroloogilisi omadusi tõendavad dokumendid
Metroloogilisi omadusi tõendavad dokumendid on:
1. Eesti Akrediteerimiskeskuse akrediteerimistunnistus nr K001 (valgustustihedus).
2. Fotodetektori rahvusvaheline võrdlusmõõtmine „Pilot Comparison on the fiber optic power
responsivity between TUBITAK UME, IO-CSIC and AS Metrosert, SmartPhora A3.1.4“
(spektraalne tundlikkus).
5. Optiliste suuruste riigietaloni laboriruum
ASi Metrosert Tallinna labori ruumid asuvad aadressil Teaduspargi 8, Tallinn.
Erinõudeid laboriruumi keskkonnatingimustele seatud ei ole, laboriruumid on ilma akendeta ja
valgustustiheduse laboriruumi siseseinad on värvitud mustaks.
Keskkonna temperatuur laborites on vahemikus 20 °C…23 °C / stabiilsus ±2,0 °C.
Mõõtmisel kasutatavatele riigietaloni seadmetele ja abivahenditele on vajalikud tingimused
laboriruumides tagatud. Nendeks on tavatemperatuur, temperatuuri stabiilsus, elektritoide ja vajalik
õhuniiskus.
6. Optiliste suuruste riigietaloni säilitamise, kasutamise ja
arendamisega seotud personal
Optiliste suuruste riigietaloni säilitamisega ja arendamisega tegelevad Meelis-Mait Sildoja, Matt
Rammo ja Toomas Kübarsepp. Töötajate akadeemilised CV-d on leitavad Eesti Teadusinfosüsteemist
ETIS (www.etis.ee).
7. Optiliste suuruste riigietaloni säilitamise, kasutamise ja arendamise
tasuvusanalüüs
Aastatel 2022-2025 on Metrosert investeerinud optiliste suuruste riigietaloni arendusprojekti raames
põhivara ehk seadmete soetamiseks 536 407 eurot, investeerimiseks vajalikud vahendid pärinevad
peamiselt majandus- ja kommunikatsiooniministeeriumi teadus- ja arendusrahastusest. Seega ei võta
allolev analüüs arvesse seadmete amortisatsioonikulusid, sest investeeringuteks vajalikud vahendid
on Metroserdile laekunud investeeringu tegemise aastal sihtfinantseeringuga.
Optiliste suuruste riigietaloniga teenitav tulu koosneb kahest komponendist. Müügitulu hõlmab
teenuseid nagu kalibreerimine ja mõõtmine, samuti optiliste suurustega seotud
konsultatsiooniteenuseid ja ettevõtetele teostatavaid TA-projekte. Tulu teadus- ja
7
arendusprojektidest on rahvusvahelistest taotlusvoorudest laekuv granditulu teadus- ja
arendustegevusteks. Prognoosid on tehtud 2025. aasta reaalsete andmete alusel.
Optiliste suuruste riigietaloni kulude peamise osa moodustavad tööjõukulud, arvestatud on kahe
(doktorikraadiga) teaduri ja ühe juhtivteaduri palgakulu, võttes arvesse iga-aastast võimalikku
korrektuuri. Teise kulukomponendi moodustavad investeeringud, mis on vajalikud valdkonna
edasiseks arendustegevuses. Otsekulude hulgas on erinevad väikevahendid ja materjalid igapäevase
töö elluviimiseks. Üldkuludes on lisaks pindade ja administratiivkuludele ka kõik muud kulud, nt
tarkvara, side, laborite koristus, elekter ja soojus jne. Üldkulude määraks on arvestatud 25%
kuludest. Optiliste suuruste riigietaloni prognoositavad tulud ja kulud on esitatud tabelis 4.
Optiliste suuruste kulude ja tulude prognoos ei võta arvesse tulu, mida saavad erinevad ettevõtted ja
asutused lisandunud kalibreerimisteenuste ja TA-tegevuse tulemusena. Võttes arvesse
kvanttehnoloogia valdkonna kiiret arengut, samuti valgusel põhinevate tehnoloogiate
kasutuselevõttu näiteks meditsiinis, on lisaks otsesele tulule oluline laiem kasu sellest, et Eestis on
olemas valdkondlik kompetents. Selle kompetentsi toel on võimalik lisaks kalibreerimisteenuse
osutamisele toetada uue tehnoloogiliste lahenduste arendamist ja uue tehnoloogia kasutuselevõttu.
Tegevuse heaks näiteks on turvalise side ja kvantvõtmejaotusega seonduv, mille käigus Metrosert on
optiliste suuruste riigietaloni arendamise käigus saadud teadmisi kasutades arendanud välja
kompetentsi kvantkindlate võrkude testimiseks.
Tabel 4. Optiliste suuruste riigietaloni tulud ja kulud viie aasta perspektiivis
2026 2027 2028 2029 2030
Tulud 205000 210000 255000 267000 295000
Teenuste müük (konsultatsioon, TA-teenused 45000 50000 55000 67000 70000
ja mõõteteenused)
Tulu rahvusvahelistest TA-projektidest 160000 160000 200000 200000 225000
Kulud -403750 -438050 -475094 -515122 -558393
Valdkonna otsekulud -25000 -27000 -29000 -31000 -33000
Personaliga seotud kulud -218000 -235440 -254275 -274617 -296587
Valdkonna arendamiseks vajalikud -100000 -110000 -121000 -133100 -146410
investeeringud
Üldkulud 25% (sh pindadega seotud kulud, -60750 -65610 -70818,8 -76404,3 -82397
admin kulud)
Kokku -198750 -228050 -220094 -248122 -263393
8
Final report of the EURAMET.EM-
K5.2018 comparison on AC power
Gertjan Kok (VSL)
Helko van den Brom (VSL)
Pierre-Jean Janin (LNE)
Adrian Wheaton (NPL)
Kristian Dauke (PTB)
Draft B
March 2026
EURAMET.EM-K5.2018 Draft B Page 2 of 46
1 INTRODUCTION
The Mutual Recognition Arrangement (MRA) requests that the metrological equivalence of national
measurement standards is determined by a set of key comparisons organised by the Consultative
Committees of the CIPM working closely together with the Regional Metrology Organisations (RMO).
Recently, the international key comparison CCEM-K5.2017 of 50/60 Hz standards was organized
under the auspices of the Consultative Committee of Electromagnetism (CCEM). As a follow-up, the
regional key comparison EURAMET.EM-K5.2018 has been conducted between the participating
National Metrology Institutes (NMIs) and Designated Institutes (DIs). Most of the participating
NMIs/DIs are members of EURAMET but one NMI from COOMET also participated.
In this EURAMET.EM-K5.2018 comparison the comparability of power measurements between the
participants was assessed. The aim of the comparison was to determine the participants‘ Degrees of
Equivalence (DoE) referred to the linked key comparison reference value of the related CCEM key
comparison CCEM-K5.2017. The comparison protocol was based on the procedures used during the
CCEM-K5.2017 comparison and followed the CCEM Guidelines for Planning, Organizing, Conducting
and Reporting Key, Supplementary and Pilot Comparisons [1].
This report presents the outcomes of the EURAMET.EM-K5.2018 key comparison. The analysis of the
comparison results with respect to the CMC claims of the participating institutes and the measures to
be taken in the case of inconsistencies are not within the scope of this report.
EURAMET.EM-K5.2018 Draft B Page 3 of 46
2 PARTICIPANS AND ORGANISATION
In total 22 laboratories participated in the comparison. The coordination was shared by four NMIs:
VSL, PTB, NPL, and LNE. VSL was responsible for the general coordination, the analysis and the
reporting, PTB performed the stability measurements for both standards, LNE was responsible for
the practical organisation of the comparison, and NPL assisted in the reporting.
The comparison was organised in two parallel loops, referred to as A and B. Four weeks were allowed
for each participant including transportation time to the next participant. However, due to the
COVID-19 pandemic, it was not possible to keep to the original schedule due to laboratory closures
and local restraints imposed on the laboratories. Nevertheless, the measurements by all 22
participants were completed in a time frame of less than two years. No technical issues occurred
with any of the transfer standards.
The full list of participants is presented in alphabetical order in Table 1.
Table 1 - Participants of the comparison
BEV Bundesamt für Eich- und Vermessungswesen Austria
BIM Bulgarian Institute of Metrology Bulgaria
CEM Centro Español de Metrología Spain
CMI Ceský Metrologický Institut Czech Republic
EIM Hellenic Institute of Metrology Greece
GUM Glówny Urzad Miar Poland
INM Institutul Național de Metrologie Romania
INRIM Istituto Nazionale di Ricerca Metrologica Italy
JV Justervesenet Norway
LNE Laboratoire National de Métrologie et d’Essais France
METAS Federal Institute of Metrology Switzerland
METROSERT AS Metrosert Estonia
MIKES VTT Centre for Metrology of the Technical Research Centre of Finland
Finland
MIRS/SIQ Metrology Institute of the Republic of Slovenia / Slovenian Slovenia
Institute of Quality and Metrology
NPL National Physical Laboratory United Kingdom
PTB Physikalisch-Technische Bundesanstalt Germany
RISE Research Institutes of Sweden Sweden
SMU Slovenský Metrologický Ústav Slovakia
TRESCAL Trescal Denmark Denmark
TUBITAK UME Ulusal Metroloji Enstitüsü Turkey
UMTS State Enterprise "Ukrmetrteststandard" Ukraine
VSL VSL B.V. Netherlands
EURAMET.EM-K5.2018 Draft B Page 4 of 46
3 TRANSFER STANDARDS
3.1 DESCRIPTION OF THE TRAVELLING STANDARDS
Two travelling standards of the type RADIAN RD-22-332S were used in this key comparison in two
parallel loops. These standards were adapted to measure active power at 120 V and 240 V and 5 A
with outstanding stability in time. PTB provided travelling standard with serial number S/N 207172
that was used in loop A and VSL provided travelling standard with serial number S/N 208014 that was
used in loop B.
The standards and accompanying accessories (connectors and power supplies) were provided with
an individual rugged plastic container, suitable for shipping the standards by air. The standards were
packaged with a temperature/humidity miniature logger. During measurements at the participant’s
laboratory, the logger remained on the top surface of the travelling standard, mainly close to the
backlit LCD of the travelling standard, in order to log measurements of ambient temperature and
humidity. The logging data were downloaded and monitored by PTB in order to keep track of the
changes of temperature or humidity which may have occurred during transportation or while staying
at the participating laboratory.
The reference standards were provided with a 24 V DC power supply, which was connected to the
mains at 240 V, 50 Hz. The auxiliary power to the travelling standard was to be applied at least 4
hours before starting the tests.
3.2 QUANTITY TO BE MEASURED
The participating laboratories reported a single power measurement for each of the 10 possible
combinations of voltage, current, and power factor referred to in Table 2. In this Table, “lead” is
defined as the current phase leading the voltage phase, and “lag” as the current phase lagging the
voltage phase. The measurement result reported was the calibration error of the travelling standard,
defined as the difference between the value of the measured quantity indicated by the travelling
standard and the applied value as determined by the participating laboratory, and divided by the
nominal apparent power in VA. The value and uncertainty of the calibration were expressed in the
unit μW/VA. The error is defined positive if the travelling standard's indication is larger than the
applied value as determined by the participating laboratory.
Table 2 - Parameters for the measurement of active power
Parameter Value
RMS voltage 120 V, 240 V
RMS current 5A
Power factor 1.0, 0.5 lead, 0.5 lag, 0 lead, 0 lag
Frequency 53 Hz
EURAMET.EM-K5.2018 Draft B Page 5 of 46
3.3 CIRCULATION SCHEME
The circulation scheme and time schedule are shown in Table 3 (Loop A) and Table 4(Loop B).
Table 3 – Travelling schedule of loop A
Duration
NMI/DI Country Start date End date
(calendar days)
PTB Germany 04/02/2019
GUM Poland 04/02/2019 28/02/2019 24
PTB Germany 04/03/2019 08/03/2019 4
CMI Czech Republic 15/03/2019 16/04/2019 32
SMU Slovakia 16/04/2019 22/05/2019 36
BEV Austria 22/05/2019 24/06/2019 33
INM Romania 26/06/2019 26/08/2019 61
PTB Germany 29/08/2019 30/09/2019 32
UME Turkey 04/11/2019 15/11/2019 11
MIRS/SIQ Slovenia 06/12/2019 16/01/2020 41
INRIM Italy 17/01/2020 24/02/2020 38
BIM Bulgaria 27/02/2020 11/06/2020 105
EIM Greece 12/06/2020 13/07/2020 31
PTB Germany 10/08/2020 14/08/2020 4
UMTS Ukraine 06/11/2020 10/12/2020 34
PTB Germany 17/12/2020 06/01/2021 20
Table 4 – Travelling schedule of loop B
Duration
NMI/DI Country Start date End date
(calendar days)
PTB Germany 04/02/2019
TRESCAL Denmark 05/02/2019 05/03/2019 28
PTB Germany 11/03/2019 14/03/2019 3
RISE Sweden 18/03/2019 23/04/2019 36
MIKES VTT Finland 24/04/2019 24/05/2019 30
METROSERT Estonia 27/05/2019 21/06/2019 25
VSL Netherlands 26/06/2019 26/08/2019 61
PTB Germany 27/08/2019 30/09/2019 34
JV Norway 01/11/2019 02/12/2019 31
METAS Switzerland 13/01/2020 17/03/2020 64
CEM Spain 18/05/2020 18/06/2020 31
LNE France 26/06/2020 04/08/2020 39
PTB Germany 18/08/2020 21/08/2020 3
NPL United Kingdom 08/09/2020 23/11/2020 76
PTB Germany 30/11/2020 18/12/2020 18
EURAMET.EM-K5.2018 Draft B Page 6 of 46
4 MEASUREMENT DESCRIPTION
4.1 METHOD OF MEASUREMENT OF ACTIVE POWER
The participating laboratories followed their usual measurement procedure to achieve their best
measurement capabilities within the allowed time frame for the comparison. Measurement results
of individual laboratories were accompanied by a description of the method used and a layout of the
primary current circuit with dimensions. The individual participants’ measurement results are
summarized in Appendix A, the data used for the calculations is provided as a separate digital
supplement with a detailed explanation in Appendix B, and the participants’ reports are shown in
Appendix C.
The measurement setups used by the participants in this comparison show great similarities. The
calibration signals are generated using a phantom power approach, generating voltage and current in
two separate circuits. This is done using a power calibrator or a function generator with
transimpedance and transconductance amplifiers. The calibration signals are applied simultaneously
to the device(s) under test and the reference setup, which typically consists of either voltage and
current scaling devices in combination with two sampling voltmeters or a commercial reference
power meter. The phase relation between voltage and current measurement is defined using an
external trigger. Voltage scaling is done using a resistive divider or an inductive voltage divider.
Current to voltage conversion is done using a current shunt or a current transformer together with a
current shunt.
4.2 MEASUREMENT CONDITIONS
The travelling standard was kept in the laboratory before the measurements for a period of time
such that it reached stable temperature. The temperature and relative humidity were reported in
the individual results. The value and uncertainty of the ambient temperature and relative humidity of
the laboratory were reported. The travelling standard was de-energized between each set of
measurements for 1 minute, followed by a warm up period of at least 15 minutes.
Voltage and current sources were set to 53 Hz with voltage and current magnitudes within 0.2 % of
the values shown in Table I. At every power factor, the required number of measurements were
taken as stated in the procedures of the calibration laboratory. Readings of active power, voltage,
current, power factor and frequency displayed on the backlit LCD of the travelling standard were
recorded. The average of at least five sets of measurements was computed.
4.3 UNCERTAINTY OF MEASUREMENT
All participants provided their results with the associated measurement uncertainty and a complete
uncertainty budget including the Type A and Type B evaluations of the uncertainty of the NMI/DI’s
calibration system. The expanded uncertainty was calculated for a level of confidence of 95.45 %,
corresponding to k = 2 for a normal distribution. The measurement uncertainty was determined
according to the ISO Guide to the Expression of Uncertainty in Measurement (GUM). All participants
supplied a statement of traceability to SI units.
EURAMET.EM-K5.2018 Draft B Page 7 of 46
5 RESULTS OF MEASUREMENT
5.1 DATA ANALYSIS
As stated by the CIPM MRA, “RMO key comparisons must be linked to the corresponding CIPM key
comparisons by means of joint participants” and “only key comparisons carried out by a Consultative
Committee or the BIPM lead to a key comparison reference value”. For a key comparison carried out
by a regional metrology organization the link to the key comparison reference value is obtained by
reference to the results from those institutes which have also taken part in the CIPM key
comparison.” In this RMO key comparison the following approach has been employed for each of the
compared quantities:
1. An internal RMO reference value has been calculated based on the submitted results by the
participants of the Euramet comparison only, as well as degrees-of-equivalence.
2. For the laboratories participating both in the CIPM and in the Euramet comparison, a
comparison of the degrees-of-equivalence obtained in each of the comparisons has been
made, resulting in a linking correction.
3. This linking correction can be used to calculate an updated, linked RMO reference value, as
well as updated, linked degrees of equivalence.
In the next sections these steps will be presented in more detail. First, the calculation of the internal
RMO reference value for the Euramet.EM-K5.2018 comparison is explained. This calculation will be
performed following the mainstream approach presented in [2] extended to the general, multi-
dimensional case in [3], as there are two loops in the comparison. After this, the calculation of the
linking correction will be presented in more detail, after which the computed numerical values for
the linked degrees of equivalence will be presented. The analysis finishes with a brief discussion.
5.2 SYMBOLS AND ABBREVIATIONS
In order not to make the notation too complex the test point is not explicitly indexed as a parameter
in the notation. The mathematical model and analysis process has been repeated for each of the ten
test points which are specified by the required voltage, current and PF values. Where relevant, the
loop is indicated with superscript 𝐴 or 𝐵. The notation is introduced in Table 5 for loop 𝐴; the
notation for loop 𝐵 is defined in an analogous way.
Table 5 - Symbols and abbreviations. The notation for loop B is defined in an analogous way as that for loop A.
MRA Mutual Recognition Agreement
CIPM International Committee of Weights and Measures
CCEM Consultative Committee for Electricity and Magnetism
RMO Regional Metrology Organization
Euramet RMO for Europe
TS Travelling Standard: artefact that has been sent around
PL Pilot Laboratory: laboratory where the standards have been repeatedly measured (in this
case PTB)
REF RMO comparison reference value
KCRV Key Comparison Reference Value of the CIPM comparison to which this comparison links
LKCRV Linked Key Comparison Reference Value, the updated REF after linking it to the CIPM
comparison based on the results of the linking laboratories
EURAMET.EM-K5.2018 Draft B Page 8 of 46
RDOE RMO Degree of Equivalence, calculated with respect to REF
DOE Degree Of Equivalence, calculated with respect to the LKCRV
𝑦0𝐴 true value of loop 𝐴: the unknown value of the calibration error of TS 𝐴
𝐴
𝑦ref RMO reference value in loop 𝐴, the best estimate of 𝑦0𝐴 based on the provided
measurement results of the measurements performed within the RMO comparison only
𝐴 LKCRV in loop 𝐴
𝑦lkcrv
ℓ correction term for linking the CIPM KCRV to the RMO REF value and similarly for linking
the DOEs
𝑦𝑖 measured value by laboratory 𝑖, whereby the index 𝑖 implicitly specifies if TS 𝐴 or TS 𝐵
has been measured. The PL has two indices, one for each TS.
𝑦𝑖,𝑗 𝑗-th repetition of measured value by laboratory 𝑖 (only relevant for the PL)
𝛿𝑖𝐴 instrument instability of TS 𝐴 measured at laboratory 𝑖
𝜂𝑖 measurement error of laboratory 𝑖
𝑢𝑖 standard uncertainty of 𝜂𝑖 provided by laboratory 𝑖
𝑟 correlation coefficient of the measurement error for any laboratory when performing
repeated measurements (relevant for the PL and for the linking laboratories)
𝐴
𝑢TS standard uncertainty of 𝛿𝑖𝐴 (value independent of laboratory 𝑖)
𝑢(𝑦𝑖 ) 𝐴 𝐵
standard uncertainty of 𝑦𝑖 , combining 𝑢𝑖 and 𝑢TS (or 𝑢TS )
𝑛𝐴 number of participating laboratories in loop 𝐴
𝑚 number of repetitions at the PL for each test point
𝐴 index of the PL in loop 𝐴
𝑖𝑃𝐿
𝑘 coverage factor for the expanded uncertainty
𝑑′𝑖 RMO degree of equivalence of laboratory 𝑖 (i.e. with respect to REF)
𝐸′𝑖 normalized RDOE of laboratory 𝑖 (i.e. with respect to REF)
𝑑𝑖 degree of equivalence of laboratory 𝑖 with respect to LKCRV
𝐸𝑖 normalized DOE of laboratory 𝑖 (i.e. with respect to LKCRV)
5.3 ASSUMPTIONS
Some of the modelling assumptions and choices that have been used to solve the mathematical
model are listed below. The pertinence of the assumptions has been verified by means of the data
wherever possible.
• The uncertainties of all laboratories are considered independent.
• For repetitive measurements, the uncertainty of individual laboratories is assumed to be
largely systematic, i.e. the measurement uncertainties for the same laboratory have
correlation coefficient 𝑟 = 0.8.
• The PL has participated with the average result of the 5 repeated stability measurements. In
view of the assumed correlation, the PL laboratory uncertainty for the mean equals
𝑢 √(1 + 4𝑟)/5 = 0.92 𝑢, whereby 𝑢 is the uncertainty provided for each of the five
measurements. The additional random uncertainty due to the TS will average out by a factor
1/√5.
• Although the PL is assumed to have some random uncertainty, the observed variation in the
repeated stability measurement results by the PL is entirely attributed to the instabilities of
EURAMET.EM-K5.2018 Draft B Page 9 of 46
the two TSs in order not to underestimate the TS uncertainty if the assumed correlation
coefficient 𝑟 would be too low.
• The instrument instabilities are fully random, no drift correction over time is needed. (This
has been verified by fitting a line to the repeated stability measurements at the PL, and
verifying that the slope coefficient of the line is not statistically different from zero.)
• The link with the related CCEM-K5.2017 comparison (KCRV) is based on the calculation of a
correction term to the degrees of equivalence in this Euramet RMO comparison (RDOEs) in
order to establish linked degrees of equivalence (LDOEs). This procedure can also be
interpreted as the calculation of new linked reference values for the Euramet.EM-K5.2018
comparison. The correction term due to the link turned out to be insignificant in view of its
uncertainty, but can nevertheless be used to align the realized DOEs in both comparisons as
much as possible.
A more detailed discussion of the instrument instabilities based on the results of the repeated
measurements at the PL can be found in section 5.6.
5.4 MATHEMATICAL MODEL
The measured value 𝑦𝑖𝐴 (i.e., the calibration error) of TS 𝐴 by laboratory 𝑖 at a specific test point can
be modelled as a sum of the true value 𝑦0𝐴 , the (mean-zero) instrument instability 𝛿𝑖𝐴 , and the
(mean-zero) measurement error 𝜂𝑖 of the laboratory in the following way (similarly for TS 𝐵):
𝑦𝑖 = 𝑦0𝐴 + 𝛿𝑖𝐴 + 𝜂𝑖 1 ≤ 𝑖 ≤ 𝑛𝐴 (1)
𝑦𝑖 = 𝑦0𝐵 + 𝛿𝑖𝐵 + 𝜂𝑖 𝑛 𝐴 + 1 ≤ 𝑖 ≤ 𝑛 𝐴 + 𝑛𝐵 (2)
where the laboratories with indices 1 to 𝑛 𝐴 have measured TS 𝐴 in loop 𝐴 and the laboratories with
indices 𝑛 𝐴 + 1 to 𝑛 𝐴 + 𝑛𝐵 TS 𝐵 in loop 𝐵. As the PL has measured both TSs, it has two corresponding
𝐴 𝐵
indices denoted by 𝑖𝑃𝐿 and 𝑖𝑃𝐿 . As the measurement error of the PL is assumed to be correlated
between various measurements, the correlation between 𝜂𝑖𝐴 and 𝜂𝑖𝐵 can be used to connect the
𝑃𝐿 𝑃𝐿
results of loops 𝐴 and 𝐵 with each other. In this analysis it is assumed that the errors are largely
correlated, i.e.,
𝑟 (𝜂𝑖𝐴 , 𝜂𝑖𝐵 ) = 0.8 (3)
𝑃𝐿 𝑃𝐿
The standard uncertainty 𝑢𝑖 of the measurement error 𝜂𝑖 is provided by laboratory 𝑖 itself:
𝑢(𝜂𝑖 ) = 𝑢𝑖
𝐴 𝐵
The standard uncertainties 𝑢TS and 𝑢TS of the travelling standards are determined based on the 𝑚 =
5 repeated measurements by the PL and are the same for each laboratory. This calculation is
presented in section 5.6. These values only depend on the TS and not on the laboratory 𝑖:
𝑢(𝛿𝑖𝐴 ) = 𝑢TS
𝐴
𝑢(𝛿𝑖𝐵 ) = 𝑢TS
𝐵
The combined uncertainty 𝑢(𝑦𝑖 ) of the measurements 𝑦𝑖 follows from combining the laboratory
𝐴 𝐵
uncertainty 𝑢𝑖 with the instrument instability uncertainty 𝑢TS or 𝑢TS . For the laboratories which
measured the standard once (all but the PL), this yields:
EURAMET.EM-K5.2018 Draft B Page 10 of 46
2
𝑢(𝑦𝑖 ) = √𝑢𝑖2 + 𝑢 𝑇𝑆
𝐴
1 ≤ 𝑖 ≤ 𝑛 𝐴, 𝐴
𝑖 ≠ 𝑖𝑃𝐿 (4)
2
𝑢(𝑦𝑖 ) = √𝑢𝑖2 + 𝑢𝐵𝑇𝑆 𝑛 𝐴 + 1 ≤ 𝑖 ≤ 𝑛 𝐴 + 𝑛𝐵 , 𝐵
𝑖 ≠ 𝑖𝑃𝐿 (5)
The PL has measured both standards five times. It is assumed that the PL laboratory uncertainties are
correlated for different measurements with correlation coefficient 𝑟 according to equation (3),
whereas the instrument stability uncertainty is random, and is averaged over the five measurements.
The reported values 𝑦𝑖𝐴 and 𝑦𝑖𝐵 are the mean values over all repeated measurements. The
𝑃𝐿 𝑃𝐿
combined uncertainties in loop 𝐴 and 𝐵 for the PL are now given by
2
𝑢(𝑦𝑖𝐴 ) = √(𝑢𝑖2𝐴 (1 + 4𝑟) + 𝑢 𝑇𝑆
𝐴
)/5 (6)
𝑃𝐿 𝑃𝐿
2
𝑢(𝑦𝑖𝐵 ) = √(𝑢𝑖2𝐵 (1 + 4𝑟) + 𝑢𝐵𝑇𝑆 )/5 . (7)
𝑃𝐿 𝑃𝐿
The equations (1) and (2) above can be written in matrix notation in the following form:
𝒚 = 𝑋 𝒚0 + 𝜹 + 𝜼 (8)
with
𝑦1 𝛿1𝐴 𝜂1
1 0 ⋮
⋮ ⋮ ⋮ ⋮
𝑦𝑛𝐴 1 0 𝑦𝐴 𝛿𝑛𝐴𝐴 𝜂𝑛𝐴
𝒚= 𝑦𝑛𝐴 +1 , 𝑋= , 𝒚0 = ( 0𝐵 ), 𝜹= , 𝜼= 𝜂𝑛𝐴 +1
0 1 𝑦0 𝛿𝑛𝐵𝐴 +1
⋮ ⋮ ⋮ ⋮ ⋮
(𝑦𝑛𝐴 +𝑛𝐵 ) (0 1) (𝜂
𝐵 𝑛 +𝑛𝐵 )
𝐴
(𝛿𝑛𝐴 +𝑛𝐵 )
and associated covariance matrix of 𝜹 + 𝜼 given by
𝑣1,1 ⋯ 𝑣1,𝑛𝐴 +𝑛𝐵
𝑉𝒚 = ( ⋮ ⋱ ⋮ ). (9)
𝑣𝑛𝐴 +𝑛𝐵 ,1 ⋯ 𝑣𝑛𝐴 +𝑛𝐵 ,𝑛𝐴 +𝑛𝐵
The only non-zero entries 𝑣𝑖,𝑗 of the covariance matrix 𝑉𝒚 are given by the diagonal entries 𝑣𝑖,𝑖 and
the entries resulting from the covariance of the measurements by the PL:
𝑣𝑖,𝑖 = 𝑢2 (𝑦𝑖 )
𝑣𝑖𝐴 ,𝑖𝐵 = 𝑣𝑖𝐵 ,𝑖𝐴 = 𝑟 𝑢𝑖𝐴 𝑢𝑖𝐵 .
𝑃𝐿 𝑃𝐿 𝑃𝐿 𝑃𝐿 𝑃𝐿 𝑃𝐿
Note that even in the case of 𝑟 = 1, the variables 𝑦𝑖𝐴 and 𝑦𝑖𝐵 would not be fully correlated due to
𝑃𝐿 𝑃𝐿
the random uncertainties of the TSs.
The solution of the weighted least squares problem corresponding to (8) and (9) follows from
minimizing the function
EURAMET.EM-K5.2018 Draft B Page 11 of 46
𝒂 ↦ (𝒚 − 𝑋𝒂)T 𝑉𝒚 −1 (𝒚 − 𝑋𝒂).
𝐴𝐵 𝐴 𝐵 T
̂ = 𝒚ref
The solution 𝒂 = (𝑦ref , 𝑦ref ) and associated covariance matrix 𝑉𝒂̂ are given by
−1
𝐴𝐵
𝒚ref = 𝑉𝒚−1 T −1
𝐴𝐵 𝑋 𝑉𝒚 𝒚 and 𝑉𝒚𝐴𝐵 = (𝑋 T 𝑉𝒚−1 𝑋) .
ref ref
𝐴 𝐵
In section 0, 𝑦ref will be referred to by REF-A, and 𝑦ref by REF-B.
The RMO degrees of equivalence (RDOE) 𝑑′𝑖 are defined by
𝐴
𝑑′𝑖 = 𝑦𝑖 − 𝑦ref for 1 ≤ 𝑖 ≤ 𝑛𝐴 (10)
𝐵
𝑑′𝑖 = 𝑦𝑖 − 𝑦ref for 𝑛𝐴 + 1 ≤ 𝑖 ≤ 𝑛𝐴 + 𝑛𝐵 (11)
or in vector notation
𝐴𝐵
𝒅′ = 𝒚 − 𝒚ref with 𝒚ref = 𝑋 𝒚ref
The uncertainty of the DOEs are given by the covariance matrix
𝑉𝒅′ = 𝑉𝒚 − 𝑉𝒚ref where 𝑉𝒚ref = 𝑋 𝑉𝒚𝐴𝐵 𝑋 T
ref
See [3] for the details of the computation.
Component-wise this corresponds to
𝐴
𝑢(𝑑′𝑖 ) = √𝑢2 (𝑦𝑖 ) − 𝑢2 (𝑦ref ) for 1 ≤ 𝑖 ≤ 𝑛 𝐴
𝐵
𝑢(𝑑′𝑖 ) = √𝑢2 (𝑦𝑖 ) − 𝑢2 (𝑦ref ) for 𝑛 𝐴 + 1 ≤ 𝑖 ≤ 𝑛 𝐴 + 𝑛𝐵
𝐴 𝐵
where 𝑢2 (𝑦ref ) and 𝑢2 (𝑦ref ) are given by entries (1,1) and (2,2) of the 2 × 2 matrix 𝑉𝒂̂.
The (signed) normalized RDOE 𝐸′𝑖 equals 𝑑′𝑖 normalized by 𝑘 𝑢(𝑑′𝑖 ) where 𝑘 denotes a coverage
factor, usually 𝑘 = 2. The expression for 𝐸′𝑖 is then given by
𝑑′𝑖
𝐸′𝑖 =
2 𝑢(𝑑′𝑖 )
For PTB two RDOEs, 𝑑′𝑖𝐴 and 𝑑′𝑖𝐵 , are available corresponding to the measurement of the two TSs.
𝑃𝐿 𝑃𝐿
These DOEs can be combined into a single RDOE 𝑑′PL by computing their uncertainty weighted
average in the following way, where 𝒆 = (1,1)T, 𝒅′PL = (𝑑′𝑖𝐴 , 𝑑′𝑖𝐴 )T and 𝑉𝒅′PL denotes the
𝑃𝐿 𝑃𝐿
covariance matrix of 𝒅′PL:
−1/2
𝑢(𝑑′PL ) = (𝒆T 𝑉𝒅′PL −1 𝒆) (12)
𝑑′PL = (𝒆T 𝑉𝒅′PL −1 𝒅′PL ) 𝑢2 (𝑑′PL ) (13)
The normalized RDOE 𝐸′PL then follows from 𝐸′PL = 𝑑′PL / (2 𝑢(𝑑′PL )).
EURAMET.EM-K5.2018 Draft B Page 12 of 46
5.5 LARGEST SUBSET OF CONSISTENT VALUES AND DETERMINATION OF THE RMO
REFERENCE VALUE
There are various methods for assessing if the results provided by the laboratories are consistent. In
[2] and [3] a chi-squared test is proposed. This test provides valid results (i.e., with a correct
significance level) regarding the consistency of the measured values by the laboratories if the
uncertainties provided by all laboratories are appropriate. If some laboratories overestimated and
others underestimated their uncertainties, the chi-squared test may not have the desired
significance level. The test may indicate consistency in a situation where there actually is a problem
and where further analysis is required. Furthermore, in the case one laboratory underestimates its
uncertainty this may result in a shift of the reference value resulting in unreasonably high 𝐸′𝑖 values
for other laboratories. This may not be fair to these other laboratories and it may not give a proper
representation of the capabilities of the participants of the comparison.
ISO 17043 [4] suggests that
• |𝐸′𝑖 | ≤ 1 indicates “satisfactory” performance and generates no signal;
• |𝐸′𝑖 | > 1 indicates “unsatisfactory” performance and generates an action signal.
In this report this latter approach has been followed in the following way: for every test point the
reference value is calculated using the results of all laboratories and the 𝐸′𝑖 values for all laboratories
are calculated. If one or more laboratories have a value with |𝐸′𝑖 | > 1, the laboratory with the
highest absolute value is excluded from contributing to the calculation of the reference value and the
evaluation of the mathematical model is repeated without the measurement result of that
laboratory. If there are still laboratories with |𝐸′𝑖 | > 1 the process is repeated again by excluding one
additional lab, and this iteratively continues until all laboratories contributing to the reference value
for a specific test point have |𝐸′𝑖 | ≤ 1. After establishing the reference value the degrees of
equivalence for the excluded laboratories can be calculated using
𝐴 𝐴
𝑢(𝑑′𝑖 ) = √𝑢2 (𝑦𝑖 ) + 𝑢2 (𝑦ref ) if 1 ≤ 𝑖 ≤ 𝑛 𝐴 and laboratory 𝑖 not contributing to 𝑦ref
𝐵 𝐵
𝑢(𝑑′𝑖 ) = √𝑢2 (𝑦𝑖 ) + 𝑢2 (𝑦ref ) if 𝑛 𝐴 + 1 ≤ 𝑖 ≤ 𝑛 𝐴 + 𝑛𝐵 and laboratory 𝑖 not contributing to 𝑦ref
𝐴 𝐵
Note the plus sign in the equations above which is due to the fact that 𝑦𝑖 and 𝑦ref resp. 𝑦ref are now
independent. The normalized error values with respect to the RMO reference value for these
laboratories can be calculated in the usual way by means of 𝐸′𝑖 = 𝑑′𝑖 /(2 𝑢(𝑑′𝑖 )).
Bilateral DOEs 𝑑′𝑖𝑗 between laboratories 𝑖 and 𝑗 and their uncertainties 𝑢(𝑑′ 𝑖𝑗 ) can now be
calculated using the vector 𝒆𝑖𝑗 = (0, … ,0,1,0, … ,0, −1,0, … 0)T , whereby the 1 is at position 𝑖 and
the -1 is at position 𝑗, in the following way:
𝑑′𝑖𝑗 = 𝒆T𝑖𝑗 𝒅′ = 𝑑′𝑖 − 𝑑′𝑗 (14)
𝑢(𝑑′ 𝑖𝑗 ) = √𝒆T𝑖𝑗 𝑉𝒅′ 𝒆𝑖𝑗 = √𝑢2 (𝑑′ 𝑖 ) + 𝑢2 (𝑑′𝑗 ) − 2 𝑢(𝑑′ 𝑖 , 𝑑′𝑗 ), (15)
where 𝑢(𝑑′ 𝑖 , 𝑑′𝑗 ) denotes the covariance between 𝑑′ 𝑖 and 𝑑′𝑗 , corresponding to entry (𝑖, 𝑗) from 𝑉𝒅′ .
EURAMET.EM-K5.2018 Draft B Page 13 of 46
The bilateral DOEs have not been reported in this document, but are part of the digital supplement
(that is considered Appendix D of this report, not printed out in this document, but with a read-me as
Appendix B of this document).
5.6 CALCULATION OF THE TRAVELING STANDARD INSTABILITIES
As overall (single) reported values from the PL for each loop the mean values of the 𝑚 = 5 repeated
measurements 𝑦𝑖𝐴 ,𝑗 and 𝑦𝑖𝐵 ,𝑗 (1 ≤ 𝑗 ≤ 5) are used:
𝑃𝐿 𝑃𝐿
5
1
𝑦𝑖𝐴 = ∑ 𝑦𝑖𝐴 ,𝑗
𝑃𝐿 5 𝑃𝐿
𝑗=1
5
1
𝑦𝑖𝐵 = ∑ 𝑦𝑖𝐵 ,𝑗
𝑃𝐿 5 𝑃𝐿
𝑗=1
𝐴
The standard uncertainties 𝑢TS = 𝑢(𝛿𝑖𝐴 ) and 𝑢TS
𝐵
= 𝑢(𝛿𝑖𝐵 ) due to the instabilities of the traveling
standards are calculated from the standard deviation of the repeated measurements:
5
𝐴
1 2
𝑢TS =√ ∑ (𝑦𝑖𝐴 ,𝑗 − 𝑦𝑖𝐴 )
4 𝑃𝐿 𝑃𝐿
𝑗=1
5
𝐵
1 2
𝑢TS =√ ∑ (𝑦𝑖𝐵 ,𝑗 − 𝑦𝑖𝐵 )
4 𝑃𝐿 𝑃𝐿
𝑗=1
The resulting values for the standard uncertainty of TS 𝐴 and 𝐵 can be found in Table 6.
𝐴
Table 6 - Calculated standard uncertainty 𝑢 𝑇𝑆 and 𝑢𝐵𝑇𝑆 for instrument instability per test point expressed in ppm.
Test point 120 V 120 V 120 V 120 V 120 V 240 V 240 V 240 V 240 V 240 V
5A 5A 5A 5A 5A 5A 5A 5A 5A 5A
PF = 1 0.5 lead 0 lead 0.5 lag 0 lag PF = 1 0.5 lead 0 lead 0.5 lag 0 lag
𝐴
𝑢TS [ppm] 2.4 1.4 1.2 1.8 0.9 2.8 1.2 1.2 1.7 0.7
𝐵
𝑢TS [ppm] 0.6 0.7 1.1 0.2 0.4 1.4 0.9 0.7 1.0 0.6
In appendix A all measurement data is listed and plotted, including the repeated measurements by the
PTB. From these plots it becomes clear that no systematic drift is present, which has been confirmed
by a statistical test for the significance of the fitted slope.
5.7 LINKING PROCEDURE
In order to link this RMO (Euramet) comparison to the worldwide CIPM (CCEM) comparison, the
results of the four linking laboratories LNE, PTB, RISE and VSL in both comparisons have been
(CIPM)
considered. Let 𝑑𝑖 denote the degree of equivalence of laboratory 𝑖 in the CIPM comparison
and 𝑑𝑖 its degree of equivalence in the RMO comparison after correction of 𝑑𝑖′ by means of the
linking procedure. In view of the mean zero measurement errors for all laboratories, and in the case
of consistent measurements, it should hold in particular for the DOEs of linking laboratories that
EURAMET.EM-K5.2018 Draft B Page 14 of 46
(CIPM)
𝑑𝑘 ≈ 𝑑𝑘 (16)
whereby inequality can be due to the uncertainties in all of the considered measurements as well as
the behaviour of the TSs. The goal of the linking procedure is to determine a linking correction ℓ that
can be used to compute linked DOEs 𝑑𝑖 for the laboratories not participating in the CIPM comparison
based on the RMO DOE 𝑑′𝑖 . This will be done according to
𝑑𝑖 = 𝑑′𝑖 + ℓ (17)
If the model including all reported and calculated uncertainties and assumed correlations
appropriately fits the data, the linking correction value ℓ will be insignificantly different from 0 in
view of its uncertainty. Still this DOE correction can be used to align the realized CIPM and RMO
DOEs as much as possible.
Note that equation (17) can also be interpreted as the computation of an updated reference value
for the RMO comparison, that is called in this report the ‘linked key comparison reference value’
(LKCRV), by writing
𝑑𝑖 = 𝑑′𝑖 + ℓ = 𝑦𝑖 − 𝑦ref + ℓ = 𝑦𝑖 − (𝑦ref − ℓ),
indicating that the LKCRV can be defined by
𝑦lkcrv = 𝑦ref − ℓ (18)
such that 𝑑𝑖 = 𝑦𝑖 − 𝑦lkcrv . This computation can be performed for both loop 𝐴 and 𝐵.
(CIPM) (CIPM) (CIPM)
Writing 𝑑𝑘 = 𝑦𝑘 − 𝑦kcrv and 𝑑𝑘 = 𝑦𝑘 − 𝑦lkcrv , equation (16) can be transformed into
(CIPM) (CIPM)
𝑦lkcrv ≈ 𝑦kcrv − 𝑦𝑘 + 𝑦𝑘
showing that the estimate of the LKCRV does not depend on the RMO internal reference value 𝑦ref .
The difference in all these formulations and possible definitions of a linking correction term is how
the contributions of the individual linking laboratories will be weighted when computing the overall
estimate of the link and its uncertainty.
In this report the linking correction ℓ has been defined by equation (17). Based on the measurement
results of each linking laboratory and equations (16) and (17) estimates ℓ𝑘 of ℓ can be calculated by
means of
(CIPM)
ℓ𝑘 = 𝑑𝑘 − 𝑑′𝑘 (19)
The evaluation of the uncertainties of the ℓ𝑘 is more complicated than the calculation of the values
ℓ𝑘 , as the underlying terms are correlated. Calling the (drift corrected) measurement data of the
CIPM comparison 𝒙 and its full uncertainty matrix 𝑉𝒙 and introducing
𝒙 𝑉𝒙 (cov)
𝒛 = (𝒚) and 𝑉𝒛 = ( ),
(cov) 𝑉𝒚
the correlations between the measurements in the CIPM and in the RMO comparison can now be
integrated by inserting appropriate covariance terms in the matrix 𝑉𝒛 in the submatrices indicated by
(cov). This has been done by means of the same procedure used for constructing 𝑉𝒚 above (and 𝑉𝒙 in
the CIPM analysis), using the same correlation coefficient from equation (3). By stacking all linear
EURAMET.EM-K5.2018 Draft B Page 15 of 46
transformations described in this report and similarly for the CIPM analysis, sensitivity matrices
𝐶 (CIPM) and 𝐶 (RMO) can be calculated such that
𝒅(CIPM) = 𝐶 (CIPM) 𝒙 and 𝒅′ = 𝐶 (RMO) 𝒚
Note that 𝒙, 𝑉𝒙 and 𝐶 (CIPM) have all been made digitally available in the digital supplement to the
report of the CCEM-K5.2017 comparison which is related this Euramet.EM-K5.2018 comparison. Let
(CIPM)
𝐶link contain only the rows of 𝐶 (CIPM) that correspond to linking laboratories, and similarly for
(RMO)
𝐶link . By defining
𝐶
(CIPM)
0 1 0 0 −1 0 0
𝐶link = ( link (RMO)
) and 𝐹 = (0 ⋱ 0 0 ⋱ 0 )
0 𝐶link 0 0 1 0 0 −1
the vector 𝓵 containing the estimates ℓ𝑘 and their associated covariance matrix 𝑉𝓵 can be computed
from
𝓵 = 𝐹 𝐶link 𝒛 and 𝑉𝓵 = 𝐹 𝐶link 𝑉𝒛 𝐶link T 𝐹 T.
The uncertainty-weighted estimate of the linking correction ℓ of equation (17) and its uncertainty
𝑢(ℓ) can now be computed in a similar way as what was done in equations (12) and (13). However,
in order to assure that the computed uncertainty 𝑢(ℓ) is not unrealistically low compared to the
observed dispersion of the ℓ𝑘 , a chi-squared test of the consistency of the entries of 𝓵 in view of the
covariance matrix 𝑉𝓵 was performed at a 95 % confidence level. It was seen as inappropriate to
exclude any linking laboratory from contributing to the computation of the linking correction, as the
individual analyses of the CCEM and Euramet comparisons had not excluded any of these results
either. In the case of inconsistency, an additional uncertainty term 𝛿ℓ𝑘 was added to equation (17)
for the linking laboratories with an uncertainty just large enough to make the consistency test pass,
i.e.
𝑑𝑘 = 𝑑′𝑘 + ℓ + 𝛿ℓ𝑘 (20)
2
The uncertainties 𝑢 (𝛿ℓ𝑘 ) have been chosen identical for each linking laboratory, which will be
called 𝑢2 (𝛿ℓ). This procedure corresponds to adding a diagonal matrix 𝑉𝜹𝓵 with entries 𝑢2 (𝛿ℓ) on
the diagonal to 𝑉𝓵 before calculating the weighted average. Denoting the vector with calculated
weights 𝒈, it is found that
ℓ = 𝒈T 𝓵
̃)
𝑢2 (ℓ) = 𝒈T (𝑉𝓵 + 𝑉𝜹𝓵 ) 𝒈 = 𝒈T 𝑉𝓵 𝒈 + 𝒈T 𝑉𝜹𝓵 𝒈 = 𝒈T 𝑉𝓵 𝒈 + (𝒈T 𝒈)𝑢2 (𝛿ℓ) = 𝒈T 𝑉𝓵 𝒈 + 𝑢2 (𝛿ℓ
̃ ) = (𝒈T 𝒈)𝑢2 (𝛿ℓ). The uncertainty 𝑢(𝛿ℓ
where 𝑢2 (𝛿ℓ ̃ ) is the uncertainty that is quadratically added
to the uncertainty of ℓ and it is roughly about a factor 2 smaller than the added uncertainty 𝑢(𝛿ℓ) to
the results of the individual linking laboratories, which is due to the averaging effect of using four
linking laboratories. The uncertainty 𝑢(𝛿ℓ̃ ) is also used in the uncertainty calculation of the LKCRV of
equation (18), i.e.:
̃)
𝑢2 (𝑦lkcrv ) = 𝑢2 (𝑦ref − ℓ) + 𝑢2 (𝛿ℓ (21)
̃ ) = 2.1 ppm), point 4 (𝑢(𝛿ℓ
The points with increased linking uncertainty were: point 1 (𝑢(𝛿ℓ ̃ ) = 1.2
̃ ) = 1.1 ppm) and point 10 (𝑢(𝛿ℓ
ppm), point 9 (𝑢(𝛿ℓ ̃ ) = 0.04 ppm). The finally obtained values and
uncertainties of the linking value can be found in Table 7. Note that the absolute value of each linking
EURAMET.EM-K5.2018 Draft B Page 16 of 46
correction is smaller than twice its standard uncertainty which indicates that there is no significant
difference between the CIPM DOEs and the Euramet DOEs.
Table 7 - Linking values and their expanded uncertainties (k = 2) of the Euramet comparison with the CIPM comparison for
each of the ten test points.
Test 120 V 120 V 120 V 120 V 120 V 240 V 240 V 240 V 240 V 240 V
point 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A
PF = 1 0.5 lead 0 lead 0.5 lag 0 lag PF = 1 0.5 lead 0 lead 0.5 lag 0 lag
ℓ -4.6 -1.3 1.1 -3.2 -1.1 -3.6 -2.2 2.4 -3.4 -1.2
(2𝑢(ℓ)) (6.3) (3.9) (3.5) (4.7) (3.4) (4.5) (3.8) (3.4) (4.4) (3.3)
Using a similar matrix-based approach as above, the uncertainty 𝑢(𝑑𝑖 ) of the linked DOE 𝑑𝑖 of
equation (20) can be computed in a way that respects all involved covariances, as well as the
̃ ) of the link.
calculated additional uncertainty 𝑢(𝛿ℓ
Finally, note that the linking procedure does not affect the value and uncertainty of the bilateral
DOEs between the RMO partners as the linking term ℓ does not affect the difference between DOEs.
Thus we have for the DOEs 𝑑𝑖𝑗 after linking
′
𝑑𝑖𝑗 = 𝑑𝑖𝑗
EURAMET.EM-K5.2018 Draft B Page 17 of 46
6 RESULTS OF THE COMPARISON
6.1 RMO REFERENCE VALUES AND LINKED KEY COMPARISON REFERENCE VALUE
In Table 8 and Table 9, respectively, for each test point the linked key comparison reference values
𝐴 𝐵 𝐴 𝐵
𝑦lkcrv resp. 𝑦lkcrv with expanded uncertainty (𝑘 = 2), the RMO reference values 𝑦ref and 𝑦ref with
expanded uncertainty (𝑘 = 2) and the reported values by each laboratory for loop 𝐴 resp. 𝐵 are
shown, together with the expanded combined uncertainty 2 𝑢(𝑦𝑖 ) calculated using equations (3), (4),
(5) and (6) and the values in Table 7. Measurement results not contributing to the calculation of the
RMO reference value have been marked with an asterisk. Graphs with a visual representation of the
measured values and reported expanded laboratory uncertainties 2 𝑢𝑖 can be found in appendix A.
Table 8 - LKCRV and RMO reference values and reported values with expanded combined uncertainties (k = 2) in parentheses
for loop A. The results marked with an asterisk (*) have not contributed to the calculation of the RMO reference value.
Test120 V 120 V 120 V 120 V 120 V 240 V 240 V 240 V 240 V 240 V
point 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A
Lab PF = 1 0.5 lead 0 lead 0.5 lag 0 lag PF = 1 0.5 lead 0 lead 0.5 lag 0 lag
14.2 5.7 -0.9 7.2 -1.1 20.8 11.1 -1.8 11.5 -1.4
LKCRV-A (7.4) (5.1) (4.7) (5.7) (4.6) (6.0) (5.1) (4.7) (5.6) (4.6)
9.6 4.4 0.3 4.0 -2.2 17.1 8.9 0.5 8.1 -2.6
REF-A (5.4) (4.8) (4.2) (4.9) (4.1) (5.4) (4.9) (4.2) (5.0) (4.2)
-8.0 -1.0 3.0 -7.0 -3.0 4.0 5.0 4.0 -2.0 -4.0
GUM (53.2) (32.1) (32.1) (32.2) (32.1) (53.3) (32.1) (32.1) (32.2) (32.0)
6.2 6.2 1.9 1.6 -4.4 18.0 12.2 3.8 5.5 -6.0
CMI (24.5) (14.3) (8.5) (14.5) (8.4) (24.7) (14.2) (8.5) (14.4) (8.3)
-1.5 2.8 4.2 -4.9 -5.6 11.7 8.9 4.4 1.6 -5.8
SMU (61.4) (71.9) (71.8) (71.6) (73.0) (65.6) (74.8) (75.7) (71.1) (77.8)
-5.5 -0.0 -4.1 0.5 1.7 6.6 6.4 3.6 3.0 11.4
BEV (58.9) (56.3) (53.8) (55.9) (54.3) (58.1) (55.0) (53.8) (55.6) (55.0)
18.0 3.0 16.0 21.0 12.0 16.0
- - - -
INM (54.2) (58.1) (64.1) (52.3) (58.1) (52.1)
-8.7* -5.4 -0.1 -2.3 -0.5 5.7 4.5 2.4 -0.1 -3.6
TUBITAK (17.4) (14.0) (12.6) (14.2) (12.5) (19.0) (15.2) (14.0) (15.4) (13.9)
10.6 3.4 -3.8 6.9 1.8 21.3 7.7 -5.4 13.9 3.5
PTB (9.4) (9.3) (9.2) (9.3) (9.2) (9.5) (9.2) (9.2) (9.3) (9.2)
-1.2 -1.2 0.4 -0.6 -0.5 0.5 -3.1 -4.1 2.1 1.6
SIQ (25.4) (25.2) (25.1) (25.3) (25.1) (25.6) (25.1) (25.1) (25.2) (25.0)
1.6 -0.8 -0.1 -0.4 -2.7 11.9 7.2 3.2 2.8 -5.5
INRIM (15.9) (13.9) (13.2) (14.1) (13.1) (17.0) (14.3) (13.6) (14.5) (13.5)
-15.8* 32.8* 2.2 -48.8* -12.8 -7.3* 40.5* 5.7 -48.1* -16.1
BIM (14.6) (24.2) (24.0) (24.3) (24.0) (15.2) (24.3) (24.2) (24.4) (24.1)
8.0 11.3 1.3 -12.3 -18.3 18.1 16.8 21.8 -7.9 -17.1
EIM (117.1) (107.6) (103.6) (106.7) (103.6) (116.8) (107.5) (104.3) (107.2) (104.9)
4.1 3.3 4.4 -1.5 -0.3 2.5 2.4 3.7 -0.4 -2.0
UMTS (18.8) (26.6) (23.5) (26.5) (23.5) (19.0) (26.5) (23.3) (26.6) (23.2)
EURAMET.EM-K5.2018 Draft B Page 18 of 46
Table 9 - LKCRV and RMO reference values and reported values with expanded combined uncertainties (k = 2) in parentheses
for loop B. The results marked with an asterisk (*) have not contributed to the calculation of the RMO reference value.
Test
120 V 120 V 120 V 120 V 120 V 240 V 240 V 240 V 240 V 240 V
point 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A
Lab PF = 1 0.5 lead 0 lead 0.5 lag 0 lag PF = 1 0.5 lead 0 lead 0.5 lag 0 lag
LKCRV-B 2.8 3.5 0.7 1.8 -2.4 2.6 2.9 -2.9 2.1 -0.9
(6.1) (3.7) (3.4) (4.4) (3.2) (4.6) (3.7) (3.3) (4.4) (3.3)
REF-B -1.8 2.1 1.8 -1.4 -3.5 -1.0 0.6 -0.5 -1.3 -2.1
(3.8) (3.9) (3.5) (4.1) (3.4) (3.9) (4.1) (3.4) (4.2) (3.4)
Trescal 27.0 29.0* 18.0 -2.0 -21.0 27.0 30.0* 13.0 1.0 -19.0
(32.0) (22.0) (18.1) (23.0) (19.0) (33.1) (24.1) (18.0) (23.1) (18.0)
RISE 2.7 3.8 5.2 -0.5 -6.5 6.2 7.6 -6.2 0.4 -1.4
(11.1) (10.1) (10.2) (10.0) (10.0) (11.3) (10.1) (10.1) (10.2) (10.1)
VTT -4.4 12.0 16.7* -16.7* -18.6* -1.5 15.8* 19.0* -17.8* -21.1*
(6.1) (11.1) (13.2) (11.0) (13.0) (6.6) (11.1) (13.1) (11.2) (13.1)
Metrosert -7.2 -5.5 -4.4 -1.8 1.7 -5.2 -5.3 -5.9 0.6 3.3
(44.6) (23.9) (10.1) (23.9) (9.9) (44.7) (24.0) (10.0) (24.0) (10.0)
VSL 5.0 3.0 0.0 3.0 -2.0 0.0 -2.0 -3.0 2.0 0.0
(11.1) (8.1) (6.4) (8.0) (6.0) (11.3) (7.2) (6.1) (8.2) (6.1)
JV -8.5 1.0 5.6 -10.2 -8.9 -4.2 4.6 7.4 -9.5 -10.1
(28.0) (28.0) (28.1) (28.0) (28.0) (32.1) (32.0) (32.0) (32.1) (32.0)
PTB -4.1 -2.4 -2.0 -1.6 0.0 -1.5 -2.4 -4.7 1.6 2.4
(9.2) (9.2) (9.2) (9.2) (9.2) (9.2) (9.2) (9.2) (9.2) (9.2)
METAS 0.5 2.4 2.4 -2.2 -4.7 4.8 8.5 7.1 -4.0 -9.1
(15.1) (15.1) (15.2) (15.0) (15.0) (15.2) (15.1) (15.1) (15.1) (15.0)
CEM -4.4 3.9 20.7 -2.5 20.6 -3.5 -4.4 9.5 4.2 41.1
(49.0) (44.2) (42.1) (42.0) (47.0) (49.2) (43.0) (45.0) (43.0) (50.0)
LNE 6.0 4.0 0.1 2.3 -3.6 -2.7 3.4 3.1 0.1 -6.2
(25.9) (17.1) (12.0) (17.1) (11.9) (26.0) (17.1) (11.9) (17.2) (11.9)
NPL 18.6 31.3 18.6 6.2 -15.3 3.7 30.7 18.9 -20.1 -30.5*
(25.9) (40.7) (21.0) (40.7) (20.9) (26.0) (40.8) (20.8) (40.8) (20.9)
6.2 DEGREES OF EQUIVALENCE WITH THE RMO REFERENCE VALUE
For each test point and each laboratory, the degree of equivalence 𝑑′𝑖 with respect to the RMO
reference values is shown in Table 10. For PTB a combined DOE was calculated based on the two
DOEs for the two TSs.
Table 10 - DOEs with respect to the RMO reference values with expanded combined uncertainties (k = 2). The measurement
results marked with an asterisk (*) have not contributed to the calculation of the RMO reference values.
Test 120 V 120 V 120 V 120 V 120 V 240 V 240 V 240 V 240 V 240 V
point 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A
Lab PF = 1 0.5 lead 0 lead 0.5 lag 0 lag PF = 1 0.5 lead 0 lead 0.5 lag 0 lag
GUM -17.61 -5.36 2.74 -11.03 -0.79 -13.15 -3.85 3.46 -10.12 -1.36
(52.93) (31.77) (31.81) (31.83) (31.79) (53.02) (31.72) (31.81) (31.79) (31.75)
CMI -3.45 1.81 1.64 -2.46 -2.23 0.82 3.31 3.26 -2.62 -3.36
(23.85) (13.46) (7.43) (13.62) (7.32) (24.05) (13.35) (7.42) (13.50) (7.18)
SMU -11.16 -1.61 3.92 -8.92 -3.42 -5.47 0.01 3.89 -6.54 -3.14
(61.14) (71.70) (71.72) (71.43) (72.91) (65.42) (74.68) (75.62) (70.90) (77.70)
BEV -15.09 -4.39 -4.32 -3.57 3.86 -10.50 -2.43 3.09 -5.08 14.05
(58.67) (56.10) (53.61) (55.70) (54.14) (57.86) (54.82) (53.63) (55.38) (54.84)
INM 8.39 -1.36 11.97 3.85 3.15 7.88
- - - -
(53.93) (57.87) (63.92) (52.03) (57.85) (51.87)
TUBITAK -18.31* -9.76 -0.36 -6.33 1.71 -11.45 -4.35 1.86 -8.22 -0.96
(18.20) (13.14) (11.91) (13.31) (11.83) (18.17) (14.40) (13.35) (14.54) (13.22)
EURAMET.EM-K5.2018 Draft B Page 19 of 46
Test 120 V 120 V 120 V 120 V 120 V 240 V 240 V 240 V 240 V 240 V
point 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A
Lab PF = 1 0.5 lead 0 lead 0.5 lag 0 lag PF = 1 0.5 lead 0 lead 0.5 lag 0 lag
PTB 1.09 -1.76 -3.97 1.88 3.83 3.48 -1.52 -5.35 5.00 5.62
(7.67) (7.86) (8.12) (7.84) (8.12) (7.81) (7.80) (8.11) (7.80) (8.10)
SIQ -10.81 -5.56 0.14 -4.63 1.71 -16.65 -11.95 -4.64 -6.02 4.24
(24.86) (24.70) (24.76) (24.79) (24.72) (25.05) (24.64) (24.76) (24.73) (24.68)
INRIM -8.01 -5.11 -0.33 -4.38 -0.51 -5.25 -1.67 2.70 -5.32 -2.87
(14.91) (13.05) (12.54) (13.18) (12.48) (16.09) (13.48) (12.97) (13.63) (12.83)
BIM -25.37* 28.45* 1.95 -52.80* -10.63 -24.44* 31.67* 5.11 -56.23* -13.42
(15.61) (24.64) (23.63) (24.76) (23.59) (16.16) (24.79) (23.81) (24.89) (23.73)
EIM -1.62 6.96 0.99 -16.37 -16.07 0.98 7.99 21.21 -16.06 -14.45
(116.95) (107.45) (103.49) (106.57) (103.51) (116.64) (107.41) (104.22) (107.06) (104.82)
UMTS -5.51 -1.06 4.14 -5.53 1.91 -14.65 -6.45 3.16 -8.52 0.64
(18.00) (26.12) (23.14) (26.00) (23.11) (18.27) (26.06) (22.94) (26.14) (22.86)
Trescal 28.80 26.86* 16.18 -0.61 -17.47 28.02 29.36* 13.53 2.32 -16.93
(31.80) (22.39) (17.80) (22.63) (18.71) (32.88) (24.40) (17.72) (22.70) (17.71)
RISE 4.54 1.69 3.37 0.88 -2.99 7.23 6.93 -5.65 1.71 0.67
(10.41) (9.29) (9.64) (9.12) (9.44) (10.64) (9.29) (9.50) (9.29) (9.47)
VTT -2.62 9.86 14.93* -15.33* -15.09* -0.50 15.15* 19.49* -16.45* -18.99*
(4.84) (10.36) (13.63) (11.75) (13.45) (5.31) (11.86) (13.50) (11.93) (13.50)
Metrosert -5.40 -7.64 -6.22 -0.41 5.23 -4.18 -5.94 -5.37 1.92 5.37
(44.46) (23.61) (9.53) (23.55) (9.34) (44.51) (23.61) (9.39) (23.61) (9.36)
VSL 6.80 0.86 -1.82 4.39 1.53 1.02 -2.64 -2.47 3.32 2.07
(10.41) (7.10) (5.37) (6.87) (5.02) (10.64) (5.93) (5.12) (7.09) (5.06)
JV -6.71 -1.17 3.75 -8.81 -5.39 -3.23 3.98 7.91 -8.22 -8.04
(27.78) (27.76) (27.87) (27.70) (27.81) (31.88) (31.78) (31.85) (31.78) (31.84)
METAS 2.34 0.29 0.54 -0.85 -1.16 5.84 7.90 7.61 -2.70 -7.03
(14.58) (14.54) (14.76) (14.43) (14.64) (14.74) (14.53) (14.67) (14.53) (14.65)
CEM -2.60 1.76 18.88 -1.11 24.13 -2.48 -5.04 10.03 5.52 43.17
(48.90) (44.02) (41.91) (41.80) (46.88) (49.07) (42.84) (44.89) (42.84) (49.90)
LNE 7.81 1.85 -1.72 3.69 -0.08 -1.73 2.72 3.65 1.40 -4.12
(25.66) (16.66) (11.54) (16.56) (11.38) (25.75) (16.65) (11.42) (16.65) (11.40)
NPL 20.45 29.12 16.74 7.62 -11.78 4.70 30.06 19.42 -18.81 -28.43*
(25.59) (40.55) (20.69) (40.52) (20.65) (25.68) (40.55) (20.57) (40.55) (21.15)
6.3 NORMALIZED DEGREES OF EQUIVALENCE WITH RESPECT TO RMO REFERENCE
VALUE
The (signed) normalized degrees of equivalence with respect to the RMO reference value for all test
points and laboratories in both loops are shown in Table 11. The entries that have an absolute value
larger than 1 have been printed in bold. It turned out that these entries exactly correspond to those
who were earlier on excluded from contributing to the calculation of the RMO reference value.
Table 11 - Normalized errors per laboratory and test point. Normalized DOEs with absolute value greater than 1 have been
printed in bold.
Test 120 V 120 V 120 V 120 V 120 V 240 V 240 V 240 V 240 V 240 V
point 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A
Lab PF = 1 0.5 lead 0 lead 0.5 lag 0 lag PF = 1 0.5 lead 0 lead 0.5 lag 0 lag
GUM -0.33 -0.17 0.09 -0.35 -0.02 -0.25 -0.12 0.11 -0.32 -0.04
CMI -0.14 0.13 0.22 -0.18 -0.30 0.03 0.25 0.44 -0.19 -0.47
SMU -0.18 -0.02 0.05 -0.12 -0.05 -0.08 0.00 0.05 -0.09 -0.04
BEV -0.26 -0.08 -0.08 -0.06 0.07 -0.18 -0.04 0.06 -0.09 0.26
EURAMET.EM-K5.2018 Draft B Page 20 of 46
Test 120 V 120 V 120 V 120 V 120 V 240 V 240 V 240 V 240 V 240 V
point 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A
Lab PF = 1 0.5 lead 0 lead 0.5 lag 0 lag PF = 1 0.5 lead 0 lead 0.5 lag 0 lag
INM 0.16 -0.02 - 0.19 - 0.07 0.05 - 0.15 -
TUBITAK -1.01 -0.74 -0.03 -0.48 0.14 -0.63 -0.30 0.14 -0.57 -0.07
PTB 0.14 -0.22 -0.49 0.24 0.47 0.44 -0.20 -0.66 0.64 0.69
SIQ -0.44 -0.23 0.01 -0.19 0.07 -0.66 -0.48 -0.19 -0.24 0.17
INRIM -0.54 -0.39 -0.03 -0.33 -0.04 -0.33 -0.12 0.21 -0.39 -0.22
BIM -1.63 1.15 0.08 -2.13 -0.45 -1.51 1.28 0.21 -2.26 -0.57
EIM -0.01 0.06 0.01 -0.15 -0.16 0.01 0.07 0.20 -0.15 -0.14
UMTS -0.31 -0.04 0.18 -0.21 0.08 -0.80 -0.25 0.14 -0.33 0.03
Trescal 0.91 1.20 0.91 -0.03 -0.93 0.85 1.20 0.76 0.10 -0.96
RISE 0.44 0.18 0.35 0.10 -0.32 0.68 0.75 -0.59 0.18 0.07
VTT -0.54 0.95 1.10 -1.30 -1.12 -0.10 1.28 1.44 -1.38 -1.41
Metrosert -0.12 -0.32 -0.65 -0.02 0.56 -0.09 -0.25 -0.57 0.08 0.57
VSL 0.65 0.12 -0.34 0.64 0.30 0.10 -0.45 -0.48 0.47 0.41
JV -0.24 -0.04 0.13 -0.32 -0.19 -0.10 0.13 0.25 -0.26 -0.25
METAS 0.16 0.02 0.04 -0.06 -0.08 0.40 0.54 0.52 -0.19 -0.48
CEM -0.05 0.04 0.45 -0.03 0.51 -0.05 -0.12 0.22 0.13 0.87
LNE 0.30 0.11 -0.15 0.22 -0.01 -0.07 0.16 0.32 0.08 -0.36
NPL 0.80 0.72 0.81 0.19 -0.57 0.18 0.74 0.94 -0.46 -1.34
6.4 DEGREES OF EQUIVALENCE WITH RESPECT TO THE LINKED KEY COMPARISON
REFERENCE VALUES
For each test point and each laboratory, the degree of equivalence 𝑑𝑖 with respect to the linked
CCEM key comparison reference values is shown in Table 12. This also includes the four laboratories
that took part in the CCEM key comparison themselves. A plot of these results is shown in Figure 1.
Table 12 - DOEs with respect to the LKCRVs with expanded combined uncertainties (k = 2) per test point for all laboratories,
including the laboratories that took part in the CCEM comparison.
Test 120 V 120 V 120 V 120 V 120 V 240 V 240 V 240 V 240 V 240 V
point 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A
Lab PF = 1 0.5 lead 0 lead 0.5 lag 0 lag PF = 1 0.5 lead 0 lead 0.5 lag 0 lag
GUM -22.19 -6.68 3.87 -14.20 -1.94 -16.78 -6.10 5.84 -13.54 -2.58
(53.45) (32.15) (32.09) (32.32) (32.05) (53.37) (32.11) (32.08) (32.26) (32.02)
CMI -8.03 0.48 2.77 -5.63 -3.38 -2.81 1.07 5.64 -6.04 -4.58
(24.98) (14.35) (8.56) (14.72) (8.38) (24.80) (14.26) (8.51) (14.59) (8.30)
SMU -15.74 -2.93 5.05 -12.09 -4.57 -9.10 -2.24 6.27 -9.96 -4.36
(61.59) (71.87) (71.84) (71.64) (73.02) (65.70) (74.85) (75.73) (71.12) (77.81)
BEV -19.67 -5.71 -3.19 -6.74 2.71 -14.13 -4.68 5.48 -8.50 12.84
(59.14) (56.32) (53.78) (55.98) (54.30) (58.17) (55.05) (53.79) (55.66) (55.00)
INM 3.81 -2.68 - 8.80 - 0.22 0.90 - 4.46 -
(54.44) (58.09) (64.16) (52.37) (58.06) (52.16)
TUBITAK -22.89 -11.08 0.77 -9.50 0.56 -15.08 -6.60 4.24 -11.64 -2.18
(18.88) (14.06) (12.64) (14.43) (12.52) (19.14) (15.24) (13.99) (15.55) (13.86)
PTB -3.49 -3.09 -2.84 -1.29 2.68 -0.16 -3.77 -2.97 1.59 4.40
(9.60) (8.66) (8.65) (9.06) (8.60) (8.63) (8.61) (8.59) (8.95) (8.58)
SIQ -15.39 -6.88 1.27 -7.80 0.56 -20.28 -14.20 -2.26 -9.44 3.02
(25.95) (25.20) (25.12) (25.41) (25.06) (25.77) (25.15) (25.10) (25.34) (25.03)
EURAMET.EM-K5.2018 Draft B Page 21 of 46
Test 120 V 120 V 120 V 120 V 120 V 240 V 240 V 240 V 240 V 240 V
point 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A
Lab PF = 1 0.5 lead 0 lead 0.5 lag 0 lag PF = 1 0.5 lead 0 lead 0.5 lag 0 lag
INRIM -12.59 -6.44 0.80 -7.55 -1.66 -8.88 -3.91 5.08 -8.73 -4.09
(16.66) (13.97) (13.25) (14.32) (13.13) (17.18) (14.38) (13.62) (14.71) (13.49)
BIM -29.95 27.13 3.08 -55.97 -11.78 -28.07 29.42 7.49 -59.65 -14.64
(16.41) (24.70) (24.01) (24.93) (23.94) (16.37) (24.83) (24.17) (25.03) (24.09)
EIM -6.20 5.64 2.12 -19.54 -17.22 -2.65 5.74 23.59 -19.48 -15.67
(117.19) (107.57) (103.57) (106.71) (103.59) (116.79) (107.52) (104.30) (107.20) (104.91)
UMTS -10.09 -2.38 5.27 -8.70 0.76 -18.28 -8.70 5.54 -11.94 -0.58
(19.48) (26.59) (23.53) (26.59) (23.47) (19.24) (26.54) (23.31) (26.72) (23.23)
Trescal 24.22 25.54 17.32 -3.79 -18.62 24.38 27.11 15.91 -1.09 -18.15
(32.55) (22.35) (18.38) (23.35) (19.23) (33.35) (24.34) (18.29) (23.42) (18.28)
RISE -0.04 0.36 4.51 -2.29 -4.14 3.60 4.69 -3.26 -1.71 -0.55
(11.01) (9.31) (9.54) (9.56) (9.40) (10.25) (9.34) (9.43) (9.61) (9.43)
VTT -7.20 8.54 16.06 -18.51 -16.24 -4.14 12.91 21.88 -19.87 -20.20
(8.46) (11.53) (13.62) (11.86) (13.42) (7.70) (11.72) (13.48) (12.00) (13.47)
Metrosert -9.98 -8.96 -5.08 -3.59 4.08 -7.82 -8.19 -2.99 -1.49 4.15
(45.00) (24.15) (10.58) (24.24) (10.34) (44.86) (24.17) (10.42) (24.30) (10.40)
VSL 2.22 -0.46 -0.68 1.21 0.38 -2.62 -4.89 -0.09 -0.09 0.85
(11.11) (7.49) (6.02) (7.93) (5.62) (10.15) (6.57) (5.54) (7.61) (5.57)
JV -11.29 -2.49 4.89 -11.98 -6.53 -6.86 1.74 10.29 -11.64 -9.25
(28.63) (28.21) (28.25) (28.29) (28.16) (32.36) (32.20) (32.16) (32.30) (32.16)
METAS -2.24 -1.04 1.68 -4.03 -2.30 2.21 5.66 9.99 -6.11 -8.25
(16.14) (15.39) (15.45) (15.54) (15.29) (15.76) (15.42) (15.35) (15.63) (15.34)
CEM -7.18 0.44 20.02 -4.29 22.98 -6.12 -7.29 12.41 2.11 41.95
(49.39) (44.31) (42.16) (42.19) (47.09) (49.39) (43.15) (45.12) (43.22) (50.10)
LNE 3.23 0.52 -0.59 0.52 -1.23 -5.36 0.47 6.04 -2.02 -5.34
(25.74) (16.69) (11.49) (16.67) (11.37) (25.75) (16.72) (11.58) (16.83) (11.39)
NPL 15.86 27.79 17.88 4.45 -12.93 1.07 27.82 21.81 -22.22 -29.65
(26.52) (40.87) (21.19) (40.92) (21.12) (26.28) (40.88) (21.06) (40.96) (21.13)
EURAMET.EM-K5.2018 Draft B Page 22 of 46
EURAMET.EM-K5.2018 Draft B Page 23 of 46
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Figure 1: Degrees of equivalence with respect to the linked KCRV of the CCEM comparison. For the linking laboratories the
linked DOEs of the Euramet comparison are plotted with red circles, whereas the DOEs of the CCEM are printed with green
triangles and to the corresponding laboratory names an asterisk has been added. The dashed horizontal line corresponds to
the Euramet internal reference value.
6.5 NORMALIZED DEGREES OF EQUIVALENCE WITH RESPECT TO LINKED KEY
COMPARISON REFERENCE VALUE
The (signed) normalized degrees of equivalence with respect to the linked key comparison reference
value for all test points and laboratories are shown in Table 13. This also includes the four
laboratories the took part in the CCEM comparison themselves. In comparison with Table 11, NPL has
obtained an additional result with absolute En-value larger than 1.
Table 13 - Normalized linked DOEs per test point for all laboratories, including the laboratories that took part in the CCEM
comparison. Normalized linked DOEs with absolute value greater than 1 have been printed in bold.
Test 120 V 120 V 120 V 120 V 120 V 240 V 240 V 240 V 240 V 240 V
point 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A
Lab PF = 1 0.5 lead 0 lead 0.5 lag 0 lag PF = 1 0.5 lead 0 lead 0.5 lag 0 lag
GUM -0.42 -0.21 0.12 -0.44 -0.06 -0.31 -0.19 0.18 -0.42 -0.08
CMI -0.32 0.03 0.32 -0.38 -0.40 -0.11 0.08 0.66 -0.41 -0.55
SMU -0.26 -0.04 0.07 -0.17 -0.06 -0.14 -0.03 0.08 -0.14 -0.06
BEV -0.33 -0.10 -0.06 -0.12 0.05 -0.24 -0.08 0.10 -0.15 0.23
INM 0.07 -0.05 - 0.14 - 0.00 0.02 - 0.09 -
TUBITAK -1.21 -0.79 0.06 -0.66 0.04 -0.79 -0.43 0.30 -0.75 -0.16
PTB -0.36 -0.36 -0.33 -0.14 0.31 -0.02 -0.44 -0.35 0.18 0.51
SIQ -0.59 -0.27 0.05 -0.31 0.02 -0.79 -0.56 -0.09 -0.37 0.12
INRIM -0.76 -0.46 0.06 -0.53 -0.13 -0.52 -0.27 0.37 -0.59 -0.30
BIM -1.83 1.10 0.13 -2.24 -0.49 -1.71 1.19 0.31 -2.38 -0.61
EIM -0.05 0.05 0.02 -0.18 -0.17 -0.02 0.05 0.23 -0.18 -0.15
UMTS -0.52 -0.09 0.22 -0.33 0.03 -0.95 -0.33 0.24 -0.45 -0.03
Trescal 0.74 1.14 0.94 -0.16 -0.97 0.73 1.11 0.87 -0.05 -0.99
RISE -0.00 0.04 0.47 -0.24 -0.44 0.35 0.50 -0.35 -0.18 -0.06
VTT -0.85 0.74 1.18 -1.56 -1.21 -0.54 1.10 1.62 -1.66 -1.50
Metrosert -0.22 -0.37 -0.48 -0.15 0.39 -0.17 -0.34 -0.29 -0.06 0.40
EURAMET.EM-K5.2018 Draft B Page 26 of 46
Test 120 V 120 V 120 V 120 V 120 V 240 V 240 V 240 V 240 V 240 V
point 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A
Lab PF = 1 0.5 lead 0 lead 0.5 lag 0 lag PF = 1 0.5 lead 0 lead 0.5 lag 0 lag
VSL 0.20 -0.06 -0.11 0.15 0.07 -0.26 -0.74 -0.02 -0.01 0.15
JV -0.39 -0.09 0.17 -0.42 -0.23 -0.21 0.05 0.32 -0.36 -0.29
METAS -0.14 -0.07 0.11 -0.26 -0.15 0.14 0.37 0.65 -0.39 -0.54
CEM -0.15 0.01 0.47 -0.10 0.49 -0.12 -0.17 0.28 0.05 0.84
LNE 0.13 0.03 -0.05 0.03 -0.11 -0.21 0.03 0.52 -0.12 -0.47
NPL 0.60 0.68 0.84 0.11 -0.61 0.04 0.68 1.04 -0.54 -1.40
6.6 FURTHER ANALYSES
Some further analyses have been performed that have not been described in detail in this report.
A check has been performed regarding correlation between the reported calibration error and the
realized value of the nominal quantities specifying each test point (voltage amplitude, current
amplitude, phase difference, frequency) resp. the realized ambient conditions (temperature,
pressure). No significant correlation has been found, indicating that the error of the travelling
standards is not sensitive to small variations of the test point and to fluctuations of the ambient
conditions.
When combining the two DOEs of PTB it has been verified if the individual DOEs are consistent in
view of the assumed uncertainties and correlation. This turned out to be the case except for test
point 2 and test point 6. It was not possible to find the root cause for this small inconsistency, and no
action was taken.
EURAMET.EM-K5.2018 Draft B Page 27 of 46
7 COMMENTS ON SPECIFIC NMI RESULTS
The comments in sections 7.1 and 7.2 were provided by BIM and Trescal, respectively.
7.1 BIM RESULTS
After the Draft A report was distributed to the participants, BIM has performed an extensive
evaluation of the comparison results. For the purpose of this comparison an Excel file was used
especially prepared for calculation of the comparison results. We found an incorrect formula in the
Excel file (from 2020), were the reference value and the measured value were swapped. After the
corrections were made, we calculated the corresponding values of En and found that part of our new
results are in line with the LCKRV results for the instrument/traveling standard RD 207172 that we
measured. However, for some results the uncertainty was increased from 24 to 35 ppm in order to
obtain En values smaller than 1. As a result of participating in the comparison for PF = 0.5 lead/lag,
the uncertainty of our CMCs registered in KCDB will be increased by 10 ppm.
LKCRV and RMO reference values and reported values with expanded combined uncertainties (k = 2)
Test 120 V 120 V 120 V 120 V 120 V 240 V 240 V 240 V 240 V 240 V
point 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A
Lab PF = 1 0.5 lead 0 lead 0.5 lag 0 lag PF = 1 0.5 lead 0 lead 0.5 lag 0 lag
14.2 5.7 -0.9 7.2 -1.1 20.8 11.1 -1.8 11.5 -1.4
LKCRV-A (7.4) (5.1) (4.7) (5.7) (4.6) (6.0) (5.1) (4.7) (5.6) (4.6)
BIM 15 -19 -7 +38 -13 18 -22 6 44 -9
(14) (35) (24) (35) (24) (14) (35) (24) (35) (24)
DOEs with respect to the LKCRVs with expanded combined uncertainties (k = 2) per test point
Test 120 V 120 V 120 V 120 V 120 V 240 V 240 V 240 V 240 V 240 V
point 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A
Lab PF = 1 0.5 lead 0 lead 0.5 lag 0 lag PF = 1 0.5 lead 0 lead 0.5 lag 0 lag
BIM 0.8 -24.7 -6.2 30.8 -11.9 -2.7 -33.1 7.9 32.5 -7.6
(15.8) (35.4) (24.5) (35.5) (24.4) (15.2) (35.4) (24.5) (35.5) (24.4)
Normalized linked DOEs per test point
Test 120 V 120 V 120 V 120 V 120 V 240 V 240 V 240 V 240 V 240 V
point 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A
Lab PF = 1 0.5 lead 0 lead 0.5 lag 0 lag PF = 1 0.5 lead 0 lead 0.5 lag 0 lag
BIM 0.05 -0.70 -0.25 0.87 -0.49 -0.18 -0.94 0.32 0.92 -0.31
These results allow us to verify the measurement capabilities of BIM at a significantly better level
than the official comparison.
7.2 TRESCAL RESULTS
As our results are not in good agreement with the majority of the participants, we have tried to
identify some possible sources for this:
1. At the end our report we added the following note:
“3) Shortly after the completion of the intercomparison measurements and after the travelling
standard was sent to the next participant, an issue with the Fluke 52120A current amplifier was
observed. During a final check a change in output was detected depending on the presence or
EURAMET.EM-K5.2018 Draft B Page 28 of 46
absence of a Low to Ground connection on the amplifier. This prompted a correction of –19 ppm
of all 5 A reference current measurements, and this is included in all the reported measurement
results. For reasons unknown later measurements failed to reproduce this rather large
difference. This and the fact that the travelling standard had already been sent to the next
participant means that it is not entirely clear whether this issue was significant during the time
of the intercomparison measurements.
This has not changed, so we have recalculated all measurement results by removing the
correction of –19 ppm.
2. In our report we stated that the influence of the asymmetric nature of the set-up due to the
current Tee could be neglected at low frequencies. We have now put this to the test by
investigating the influence of our current Tee on the phase by using two NI PXI-5922 digitizers in
differential mode. Each side of the current Tee is measured independently against a reference
signal (voltage channel), with the side of the current Tee not used shorted. The result of this is a
difference between the high and the low side of the current Tee of –0.00008° at 53 Hz, which is
a correction to be added to the reference phase measurements.
3. With the same set-up a further possible influence, not previously considered, was investigated
by connecting the SP 120 V and 240 V resistive voltage dividers to the voltage channel as well,
including the capacitive loads and the NMIA buffer amplifiers. In this case the low side of the
current Tee was measured both with and without the dividers connected. The result is a
correction of –0.00014° with the 120 V divider and –0.00009° with the 240 V divider, also to be
added to the reference phase measurements.
Both measurement results and uncertainties have been recalculated by applying these corrections,
and an uncertainty component of ±0.0003° due to the influence on phase has also been added.
The results of these corrections are shown in the table below as “Reevaluated” next to the original
“Reported” numbers.
Nominal set points Results: Reported /
Reevaluated
Voltage Current Power Phase Frequency Error Value Expanded
Factor Angle Uncertainty
V A deg Hz µW/VA µW/VA
120 5 1 0 53 27 / 8 32 / 32
120 5 0,5 lead 60 53 29 / 17 22 / 24
120 5 0 lead 90 53 18 / 15 18 / 20
120 5 0,5 lag -60 53 -2 / -8 23 / 24
120 5 0 lag -90 53 -21 / -17 19 / 20
240 5 1 0 53 27 / 8 33 / 33
240 5 0,5 lead 60 53 30 / 18 24 / 24
240 5 0 lead 90 53 13 / 10 18 / 19
240 5 0,5 lag -60 53 1 / -6 23 / 24
240 5 0 lag -90 53 -19 / -16 18 / 19
EURAMET.EM-K5.2018 Draft B Page 29 of 46
8 DISCUSSION AND SUMMARY
In this comparison two standards for power measurement have been circulated in two parallel loops.
In loop 𝐴, 12 laboratories participated, whereas 11 laboratories participated in loop 𝐵. Each
participant calibrated the standard at 10 test points and the results were reported to VSL. PTB
participated in both loops and measured the standards five times in order to assess the stability of
the standards. The standards turned out to possess no systematic drift. Random standard
uncertainties due to instrument instability were determined in the range of 0.2 to 2.8 ppm,
depending on the test point and the standard. The laboratory uncertainty of the PL was assumed to
be substantially correlated and this was used to connect both loops to each other.
The comparison results were linked to the CIPM comparison results by means of the results of four
laboratories participating in both comparisons. Both RMO reference values, RMO degrees of
equivalence and normalized RMO degrees of equivalence, as well as linked key comparison reference
values, linked degrees of equivalence and normalized linked degrees of equivalence were calculated.
In the calculation of the RMO reference results, provided measurement results with an absolute
value of the normalized error exceeding 1 were excluded from contributing to the RMO reference
value in an iterative way. It turned out that 17 of the 22 laboratories were fully consistent with each
other for all 10 test points.
Linking the RMO results to the CIPM comparison results did not significantly change the
observations. Due to small changes in calculated En-values, one laboratory obtained an additional
test point with absolute En-value larger than 1.
9 REFERENCES
[1] CCEM Guidelines for Planning, Organizing, Conducting and Reporting Key, Supplementary and
Pilot Comparisons. CCEM, 21 March 2007
[2] M G Cox, The evaluation of key comparison data, Metrologia 39, 589, 2002
[3] L Nielsen, Evaluation of measurement intercomparisons by the method of least squares, DFM
Technical Report, 2000, DOI: 10.13140/RG.2.2.12239.02728
[4] ISO/IEC 17043:2010, Conformity assessment - General requirements for proficiency testing,
Switzerland, 2010
EURAMET.EM-K5.2018 Draft B Page 30 of 46
APPENDIX A: REPORTED MEASUREMENT VALUES
In Table 14 and Table 15 the reported values 𝑦𝑖 and reported expanded uncertainties 2𝑢𝑖 are shown
for loop 𝐴 and loop 𝐵, whereas a graphical representation is presented in Figures 2 and 3.
Table 14 - Reported measurement values with reported expanded uncertainties (k = 2) for loop A.
Approximate 120 V 120 V 120 V 120 V 120 V 240 V 240 V 240 V 240 V 240 V
Laboratory
measurement 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A
name
date PF = 1 0.5 lead 0 lead 0.5 lag 0 lag PF = 1 0.5 lead 0 lead 0.5 lag 0 lag
10.2 2.3 -5.2 8.2 3.1 21.6 7.0 -6.7 15.0 4.5
PTB-1 30-1-2019
(10.0) (10.0) (10.0) (10.0) (10.0) (10.0) (10.0) (10.0) (10.0) (10.0)
-8.0 -1.0 3.0 -7.0 -3.0 4.0 5.0 4.0 -2.0 -4.0
GUM 8-2-2019
(53.0) (32.0) (32.0) (32.0) (32.0) (53.0) (32.0) (32.0) (32.0) (32.0)
6.8 1.5 -2.4 3.8 1.3 16.5 5.9 -3.7 11.6 3.2
PTB-2 7-3-2019
(10.0) (10.0) (10.0) (10.0) (10.0) (10.0) (10.0) (10.0) (10.0) (10.0)
6.2 6.2 1.6 -4.4 18.0 12.2 5.5 -6.0
CMI 3-4-2019 1.9 (8.2) 3.8 (8.2)
(24.0) (14.0) (14.0) (8.2) (24.0) (14.0) (14.0) (8.2)
-1.5 2.8 4.2 -4.9 -5.6 11.7 8.9 4.4 1.6 -5.8
SMU 26-4-2019
(61.2) (71.8) (71.8) (71.5) (73.0) (65.4) (74.8) (75.7) (71.0) (77.8)
-5.5 -0.0 -4.1 0.5 1.7 6.6 6.4 3.6 3.0 11.4
BEV 5-6-2019
(58.7) (56.2) (53.7) (55.8) (54.3) (57.8) (55.0) (53.7) (55.5) (55.0)
18.0 3.0 16.0 21.0 12.0 16.0
INM 1-8-2019 - - - -
(54.0) (58.0) (64.0) (52.0) (58.0) (52.0)
11.8 4.6 -3.5 7.2 1.2 22.4 8.6 -5.0 13.2 3.0
PTB-3 18-9-2019
(10.0) (10.0) (10.0) (10.0) (10.0) (10.0) (10.0) (10.0) (10.0) (10.0)
-8.7 -5.4 -0.1 -2.3 -0.5 5.7 4.5 2.4 -0.1 -3.6
TUBITAK 13-11-2019
(16.7) (13.7) (12.4) (13.7) (12.4) (18.1) (15.0) (13.8) (15.0) (13.8)
-1.2 -1.2 0.4 -0.6 -0.5 0.5 -3.1 -4.1 2.1 1.6
SIQ 14-1-2020
(25.0) (25.0) (25.0) (25.0) (25.0) (25.0) (25.0) (25.0) (25.0) (25.0)
1.6 -0.8 -0.1 -0.4 -2.7 11.9 7.2 3.2 2.8 -5.5
INRIM 20-2-2020
(15.1) (13.6) (13.0) (13.6) (13.0) (16.0) (14.1) (13.4) (14.1) (13.4)
-15.8 32.8 2.2 -48.8 -12.8 -7.3 40.5 5.7 -48.1 -16.1
BIM 27-5-2020
(13.8) (24.0) (23.9) (24.0) (23.9) (14.2) (24.2) (24.1) (24.2) (24.1)
8.0 11.3 1.3 -12.3 -18.3 18.1 16.8 21.8 -7.9 -17.1
EIM 29-6-2020
(117.0) (107.5) (103.5) (106.6) (103.6) (116.6) (107.5) (104.3) (107.1) (104.9)
11.2 4.3 -3.1 6.7 0.9 22.6 8.5 -5.1 13.8 2.9
PTB-4 12-8-2020
(10.0) (10.0) (10.0) (10.0) (10.0) (10.0) (10.0) (10.0) (10.0) (10.0)
4.1 3.3 4.4 -1.5 -0.3 2.5 2.4 3.7 -0.4 -2.0
UMTS 29-11-2020
(18.2) (26.4) (23.4) (26.2) (23.4) (18.2) (26.4) (23.2) (26.4) (23.2)
13.2 4.5 -4.7 8.5 2.3 23.6 8.6 -6.3 15.8 3.9
PTB-5 5-1-2021
(10.0) (10.0) (10.0) (10.0) (10.0) (10.0) (10.0) (10.0) (10.0) (10.0)
Table 15 - Reported measurement values with reported expanded uncertainties (k = 2) for loop B.
Approximate 120 V 120 V 120 V 120 V 120 V 240 V 240 V 240 V 240 V 240 V
Laboratory
measurement 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A
name
date PF = 1 0.5 lead 0 lead 0.5 lag 0 lag PF = 1 0.5 lead 0 lead 0.5 lag 0 lag
-4.5 -2.5 -2.8 -1.5 0.4 -0.5 -2.8 -5.5 2.5 3.1
PTB-1 30-1-2019
(10.0) (10.0) (10.0) (10.0) (10.0) (10.0) (10.0) (10.0) (10.0) (10.0)
27.0 29.0 18.0 -2.0 -21.0 27.0 30.0 13.0 1.0 -19.0
Trescal 4-3-2019
(32.0) (22.0) (18.0) (23.0) (19.0) (33.0) (24.0) (18.0) (23.0) (18.0)
-4.3 -3.2 -0.3 -1.6 -0.1 -2.7 -2.6 -4.5 -0.1 2.0
PTB-2 13-3-2019
(10.0) (10.0) (10.0) (10.0) (10.0) (10.0) (10.0) (10.0) (10.0) (10.0)
2.7 3.8 5.2 -0.5 -6.5 6.2 7.6 -6.2 0.4 -1.4
RISE 5-4-2019
(11.0) (10.0) (10.0) (10.0) (10.0) (11.0) (10.0) (10.0) (10.0) (10.0)
-4.4 12.0 16.7 -16.7 -18.6 -1.5 15.8 19.0 -17.8 -21.1
VTT 23-5-2019
(6.0) (11.0) (13.0) (11.0) (13.0) (6.0) (11.0) (13.0) (11.0) (13.0)
-7.2 -5.5 -4.4 -1.8 1.7 -5.2 -5.3 -5.9 0.6 3.3
Metrosert 7-6-2019
(44.6) (23.9) (9.9) (23.9) (9.9) (44.6) (23.9) (9.9) (23.9) (9.9)
EURAMET.EM-K5.2018 Draft B Page 31 of 46
Approximate 120 V 120 V 120 V 120 V 120 V 240 V 240 V 240 V 240 V 240 V
Laboratory
measurement 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A
name
date PF = 1 0.5 lead 0 lead 0.5 lag 0 lag PF = 1 0.5 lead 0 lead 0.5 lag 0 lag
5.0 3.0 0.0 3.0 -2.0 0.0 -2.0 -3.0 2.0 0.0
VSL 4-8-2019
(11.0) (8.0) (6.0) (8.0) (6.0) (11.0) (7.0) (6.0) (8.0) (6.0)
-4.5 -2.6 -2.7 -1.6 0.1 -3.2 -2.9 -4.8 1.7 2.6
PTB-3 18-9-2019
(10.0) (10.0) (10.0) (10.0) (10.0) (10.0) (10.0) (10.0) (10.0) (10.0)
-8.5 1.0 5.6 -10.2 -8.9 -4.2 4.6 7.4 -9.5 -10.1
JV 27-11-2019
(28.0) (28.0) (28.0) (28.0) (28.0) (32.0) (32.0) (32.0) (32.0) (32.0)
0.5 2.4 2.4 -2.2 -4.7 4.8 8.5 7.1 -4.0 -9.1
METAS 15-3-2020
(15.0) (15.0) (15.0) (15.0) (15.0) (15.0) (15.0) (15.0) (15.0) (15.0)
-4.4 3.9 20.7 -2.5 20.6 -3.5 -4.4 9.5 4.2 41.1
CEM 13-6-2020
(49.0) (44.2) (42.0) (42.0) (47.0) (49.2) (43.0) (45.0) (43.0) (50.0)
6.0 4.0 0.1 2.3 -3.6 -2.7 3.4 3.1 0.1 -6.2
LNE 22-7-2020
(25.9) (17.1) (11.8) (17.1) (11.8) (25.9) (17.1) (11.8) (17.1) (11.8)
-3.0 -1.3 -1.5 -1.9 -0.6 -0.3 -0.9 -3.6 1.6 1.6
PTB-4 18-8-2020
(10.0) (10.0) (10.0) (10.0) (10.0) (10.0) (10.0) (10.0) (10.0) (10.0)
18.6 31.3 18.6 6.2 -15.3 3.7 30.7 18.9 -20.1 -30.5
NPL 9-11-2020
(25.8) (40.7) (20.9) (40.7) (20.9) (25.8) (40.7) (20.8) (40.7) (20.8)
-4.1 -2.5 -2.8 -1.5 0.2 -0.8 -2.9 -4.9 2.0 2.7
PTB-5 2-12-2020
(10.0) (10.0) (10.0) (10.0) (10.0) (10.0) (10.0) (10.0) (10.0) (10.0)
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Figure 2: Plot of the measurement results with expanded uncertainties (k = 2) as provided by the laboratories for loop A.
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Figure 3: Plot of the measurement results with expanded uncertainties (k = 2) as provided by the laboratories for loop B.
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APPENDIX B: READ-ME FILE TO DIGITAL SUPPLEMENT
In order to facilitate further analysis and uptake of the intercomparison measurement data and
computed results, the main parts of this analysis have been made available in the form of a digital,
machine-readable supplement. The main data structures of interest have been encoded in JSON
format which is available in the form of .json file as supplementary file. This also includes the bilateral
degrees of equivalence 𝑑′𝑖𝑗 and the uncertainties 𝑢(𝑑′ 𝑖𝑗 ) which have not been presented in this
report. The values of 𝑑′𝑖𝑗 are stored in the variable Calc.bildoe_per_lab_lab_pnt, whereas the values
of 𝑢(𝑑′ 𝑖𝑗 ) are stored in the variable Calc.ubildoe_per_lab_lab_pnt. As the linking procedure only
adds a constant term ℓ to all RMO degrees of equivalence 𝑑′𝑖 , there is no difference between RMO
degrees of equivalence 𝑑′𝑖𝑗 = 𝑑′𝑖 − 𝑑′𝑗 and the linked degrees of equivalence 𝑑𝑖𝑗 = 𝑑𝑖 − 𝑑𝑗 .
Furthermore, the full covariance matrices of the corrected measurement results and of the DoEs are
given as well as matrices with sensitivity coefficients, which can be of use when linking
complementary comparisons to this regional (RMO) comparison.
The data structure is split into three parts:
• ‘Gen’ contains some general variables;
• ‘Stab’ contains the measurement results of the stability measurements;
• ‘Meas’ contains the provided measurement results by the participating laboratories;
• ‘Calc’ contains the computed results as explained in the main part of this document.
• ‘Link’ contains an additional set of computed results as explained in the main part of this
document.
A detailed explanation of all variable names contained in the digital supplement can be found in
Table 16.
Table 16: Explanation of the variable names contained in the digital supplement
Variable name Explanation Reference
in report
General variables (Gen)
• n_pnts Number of test points (= 10) Table 2
• n_labs Number of participating laboratories (= 22, PTB is Table 3 and
counted once) Table 4
• n_ts Number of travelling standards (= 2) Section 3.1
• meas_pnt_defs_per_pnt Definition of test points Table 2
• laboratory_name_per_lab Names of the participating laboratories Table 3 and
Table 4
• extended_laboratory_name_ Names of the participating laboratories with an Table 3 and
per_labext additional postfix -A or -B depending on the Table 4
travelling standard being reported on
• rho_measurement_uncertainty Assumed correlation coefficient between Equation (3)
provided measurement results by the same
laboratory for the same nominal quantity (= 0.8)
Stability measurement data (Stab)
EURAMET.EM-K5.2018 Draft B Page 44 of 46
Variable name Explanation Reference
in report
• lab_name The name of the laboratory performing the Section 2
stability measurements (= PTB)
• date_per_rep_ts_pnt The measurement dates of the stability Table 14
measurements for each repeated measurement, and Table
traveling standard and test point 15
• y_per_rep_ts_pnt The measured values of the stability Table 14
measurements and Table
15
• uy_per_rep_ts_pnt The standard uncertainties of the stability Table 14
measurements and Table
15
Provided measurement data (Meas)
• date_per_labext_pnt Matrix containing the measurement dates for Table 14
each laboratory (with postfixes -A and -B) and and Table
each test point 15
• y_per_labext_pnt Matrix containing the provided measurement Table 14
values for each laboratory (with postfix -A or -B) and Table
and each test point 15
• uy_per_labext_pnt Matrix containing the provided standard Table 14
uncertainty for each laboratory (with postfix -A or and Table
-B) and each test point 15
Calculated results (Calc)
• ycor_per_labext_pnt Measured values after correction for drift per Not
laboratory and test point. Identical to applicable
y_per_labext_pnt in this comparison.
• vycor_per_labext_labext_pnt Covariance matrix with squared standard Equation (9)
uncertainties of the provided values augmented
with TS uncertainty for each pair of laboratories
per test point.
• ref_per_ts_pnt Matrix containing the computed REFs for each of 𝒚ref
the TSs for each test point
• vref_per_ts_ts_pnt 3D-matrix whereby each 2D-slice (per test point, 𝑉𝒚ref
3rd dimension) contains the covariance matrix of
the computed REFs for each pair of TSs
• sens_ref_ycor_per_ts_labext_pnt 3D-matrix whereby each 2D-slice (per test point, formula for
3rd dimension) contains the sensitivity coefficients 𝒚ref
or weights for each of the REFs w.r.t. each of the
provided measurement values
• rdoe_ts_per_labext_pnt Matrix containing the RDOEs before merging for Equation
each laboratory (with postfix -A or -B) and for (10) and
each test point (11)
• vrdoe_ts_per_labext_labext_pnt 3D-matrix whereby each 2D-slice (per test point, 𝑉𝒅′
3rd dimension) contains the covariance matrix of
the RDOEs for each pair of laboratories (with
postfix -A or -B)
EURAMET.EM-K5.2018 Draft B Page 45 of 46
Variable name Explanation Reference
in report
• sens_rdoe_ts_per_labext_labext_pnt 3D-matrix whereby each 2D-slice (per test point, Based on
3rd dimension) contains the sensitivity coefficients calculations
of the RDOE for each of the laboratories w.r.t. for 𝒅′
each of the provided measurement values
• rdoe_per_lab_pnt Matrix containing the merged RDOEs for each Equation
laboratory (only relevant for PTB) (13)
• urdoe_per_lab_pnt Standard uncertainties of the merged RDOEs per 𝑢(𝑑′𝑖 ) and
laboratory and test point Equation
(12)
• vrdoe_per_lab_lab_pnt 3D-matrix whereby each 2D-slice (per test point, modified
3rd dimension) contains the covariance matrix of version of
the merged RDOEs for each pair of laboratories 𝑉𝒅′
(only relevant for PTB)
• sens_rdoe_ycor_per_lab_labext_pnt 3D-matrix whereby each 2D-slice (per test point, Based on
3rd dimension) contains the sensitivity coefficients calculations
of the RDOE for each of the laboratories w.r.t. for 𝒅′
each of the provided measurement values (only
relevant/ different for PTB)
• bilrdoe_per_lab_lab_pnt 3D-matrix whereby each 2D-slice (per test point, Equation
3rd dimension) contains the bilateral DOEs for each (14)
pair of laboratories
• ubilrdoe_per_lab_lab_pnt 3D-matrix whereby each 2D-slice (per test point, Equation
3rd dimension) contains the standard uncertainty (15)
of the bilateral DoEs for each pair of laboratories
Calculated results w.r.t. linking (Link)
• link_per_pnt value of the link between the RMO REF value and ℓ
the CIPM KCRV per test point
• ulink_per_pnt uncertainty of the link between the RMO REF 𝑢(ℓ)
value and the CIPM KCRV per test point
• ylkcrv_per_ts_pnt LKCRV: updated reference value of the RMO Equation
comparison after linking with the CIPM (18)
comparison per TS and per test point
• uylkcrv_per_ts_pnt standard uncertainty of the LKCRV Equation
(21)
• ldoe_per_lab_pnt Matrix containing the DOEs for each laboratory Equation
after linking with the CIPM key comparison (17)
• uldoe_per_lab_pnt Matrix containing the standard uncertainty of the 𝑢(𝑑𝑗 )
DOEs for each laboratory after linking with the
CIPM key comparison
• vldoe_per_lab_lab_pnt 3D-matrix whereby each 2D-slice (per test point, 𝑉𝒅
3rd dimension) contains the covariance matrix of
the linked DOEs for each pair of laboratories after
linking with the CIPM key comparison
EURAMET.EM-K5.2018 Draft B Page 46 of 46
APPENDIX C: PARTICIPANT REPORTS
Elektrilise võimsuse mõõtühiku riigietaloni jälgitavusahel, mõõte- ja
abivahendeid ning etalone iseloomustavate metroloogiliste parameetrite,
laboriruumi ja personali kirjeldus
Sisukord
1. Sissejuhatus....................................................................................................................2
2. Mõisted ...........................................................................................................................2
3. Mõõte- ja abivahendid .....................................................................................................3
4. Jälgitavusahel ..................................................................................................................4
5. Mõõtevõime ....................................................................................................................5
6. Etaloni metroloogilisi omadusi tõendavad dokumendid ....................................................5
7. Laboriruum .....................................................................................................................6
8. Riigietaloni säilitamisega ja kasutamisega seotud personal ..............................................7
9. Riigietaloni säilitamise ja kasutamise tasuvusanalüüs ......................................................7
1
1. Sissejuhatus
Elektrilise võimsuse täpne ja usaldusväärne mõõtmine on muutunud üha olulisemaks olukorras,
kus elektrivõrk koosneb erinevatest ja erinevatel tingimustel töötavatest tootmisüksustest nagu
näiteks tuule- ja päikesepargid. Samuti on muutunud ja muutumas tarbimine, näiteks on
lisandunud elektriautode laadimisvõrgustik. Elektrilise võimsuse riigietaloni toel on võimalik
osutada või arendada järgnevaid teenuseid:
• Elektrilise võimsuse analüsaatorite ja mõõturite kontroll ja kalibreerimine ja elektrilise
võimsuse kalibraatorite kalibreerimine – teenus on vajalik eelkõige
elektroonikaettevõtetele, samuti elektrotehnika tootmise ja elektrienergia mõõtmisega
seotud ettevõtetele
• Uute teenuste arendus: elektriautode laadimisjaamade taatlemine/kontroll
• Digitaalsetes alajaamades kasutatavate seadmete kalibreerimine
Samuti on elektrilise võimsuse riigietaloni toel võimalik ellu viia ettevõtteid toetavat teadus- ja
arendustegevust, näiteks on elektrilise võimsuse etaloni mõõtevahendeid ja tarkvara kasutatud
ühe transpordiettevõtte rongi rattapaari impedantsi (näivtakistuse) kontrolliks, mis tagab, et
raudteeohutust kindlustavad tõkkepuud avanevad õigeaegselt. Samuti liigub arendustegevus
suunas, mis võimaldab tegeleda meditsiiniseamete kontrolliga, täpsemalt bioelektrilise
impedantsi analüüsiks kasutavate seadmete puhul.
Riigi- ja tugietalonide nimistu kehtestab valdkonna eest vastutav minister määrusega. Hetkel
kehtiva määruse alusel on elektriline võimsus alates 2019. aastast tugietalon.
2. Mõisted
Aktiivvõimsus (P), ühik W – vahelduvvoolu hetkvõimsuse keskväärtus ühe perioodi kestel.
Siinuselise voolu I ja pinge U võimsus väljendatuna P = U∙I∙ cos φ.
Mittesiinuselise perioodilise voolu I ja pinge U võimsus väljendatakse järgmiselt:
𝑃 = ∑𝑛 𝑃𝑛 = ∑𝑛 𝑈𝑛 𝐼𝑛 cos 𝜑𝑛 ,
kus Un ja In on pinge ning voolu harmooniliste RMS väärtused, φn – faasierinevused pinge ja voolu
harmooniliste vahel.
Näivvõimsus (S), ühik VA – pinge efektiivväärtuse U ja voolu efektiivväärtuse I korrutis: S = U∙I.
Mittesiinuselise perioodilise voolu I ja pinge U korral näivvõimsust väljendatakse järgmiselt:
𝑆 = √∑𝑛 𝑈𝑛2 ∙ ∑𝑛 𝐼𝑛2 .
Reaktiivvõimsus (Q), ühik var – siinuselise voolu I ja pinge U korral reaktiivvõimsust
väljendatakse järgmiselt: Q = U∙I∙ sin φ.
Reaktiivvõimsus (Budeanu definitsioon QB), ühik var – mittesiinuselise perioodilise voolu I ja
pinge U korral reaktiivvõimsust väljendatakse järgmiselt: 𝑄𝐵 = ∑𝑛 𝑄𝑛 = ∑𝑛 𝑈𝑛 𝐼𝑛 sin 𝜑𝑛 .
Reaktiivvõimsus (Fryze definitsioon QF), ühik var – mittesiinuselise perioodilise voolu I ja
pinge U korral reaktiivvõimsust väljendatakse järgmiselt: 𝑄𝐹 = √𝑆 2 − 𝑃2 .
Siinuselise signaali puhul QB = QF.
Moonutusvõimsus (DB), ühik VA – mittesiinuselise perioodilise voolu I ja pinge U korral
moonutusvõimsust väljendatakse järgmiselt: 𝐷𝐵 = √𝑆 2 − 𝑃2 − 𝑄𝐵2 = √𝑄𝐹2 − 𝑄𝐵2 . Siinuselise
signaali puhul DB = 0.
2
Harmooniliste kogumoonutused (THD), pinge harmooniliste kogumoonutused väljendatakse
∑ 𝑈2
järgmiselt: THD𝑢 = √ 𝑛>12 𝑛 . Voolu harmooniliste kogumoonutused väljendatakse järgmiselt:
𝑈1
∑𝑛>1 𝐼𝑛2
THD𝑖 = √ .
𝐼12
Efektiivväärtused mittesiinuselise perioodilise signaali korral: 𝑈𝑡𝑟𝑚𝑠 = √∑𝑛 𝑈𝑛2 ;
𝐼𝑡𝑟𝑚𝑠 = √∑𝑛 𝐼𝑛2 .
Diskreetimisvattmeeter – diskreetimispõhimõttel toimiv etalonvattmeeter elektrivõimsuse
mõõtmiseks.
3. Mõõte- ja abivahendid
Elektrilise võimsuse riigietalon põhineb diskreetimisvattmeetril, mis koosneb neljast
põhikomponendist:
• Analoog-digitaalmuundurid (A/D muundurid): kaks diskreetimisfunktsiooniga
multimeetrit, mida kasutatakse A/D-muunduritena.
• Pingejagurid: üheksa etalonlaboris projekteeritud ja valmistatud pingejagurit, millel on
väike AC–DC erinevus ja minimaalne faasinihe nimipingetel kuni 1000 V.
• Voolušundid: üheksa koaksiaalse ehitusega voolušunti, mille nimivool on kuni 20 A.
• Andmehõive- ja töötlustarkvara: etalonlaboris arendatud tarkvara PowerLF 1.2 kasutab
mitmeharmoonilist vähimruutude ajadomeeni algoritmi.
Pingejagurite ja voolušuntide konstruktsioon ning hoolikalt valitud komponendid
võimaldavad vähendada muundurite AC–DC erinevust, faasinihet, temperatuurimõjusid ja
võimsusteguritest tulenevat mõõtemääramatust. Diskreetimisvattmeetri SWM3458
rakendust elektrilise võimsuse mõõturite kalibreerimisel on näidatud joonisel 1.
(a) (b)
Joonis 1. Diskreetimisvattmeetri kasutamine elektrilise võimsuse mõõturi kalibreerimisel: (a)
mõõteskeem ja (b) mõõtesüsteemi foto.
3
Tabel 1. Mõõtevahendid elektrilise võimsuse ühiku säilitamisel
Mõõtevahend Tüüp Number Mõõtepiirkond Laiendmääramatus
(k =2 )
Multimeeter Keysight 3458A MY45047495 (0,01…1,2) V (25…60) μV/V
±180° (0,1..6,0) m°
(0,04…20) kHz
Multimeeter Keysight 3458A MY45047490 (0,01…1,2) V (25…60) μV/V
±180° (0,1..6,0) m°
(0,04…10) kHz
Signaali- Keysight MY48007984 (2,5…100) kHz 10 μHz/Hz
generaator 33210A
Pingejagurite RVD1, RVD2, VD01, VD02, (1…1000) V (20…160) μV/V
komplekt RVD3, RVD4, VD03, VD04, ±180° (0,2..18,3) m°
RVD5, RVD6, VD05, VD06, (0,04…10) kHz
RVD7, RVD8, VD07, VD08,
RVD9 VD09
Voolušuntide MU SIQ18059, (0,01…20) A (20…50) μA/A
komplekt SIQ18060, ±180° (0,2..18,3) m°
SIQ17056, (0,04…10) kHz
SIQ17057,
SIQ17058,
SIQ17059,
SIQ17060,
SIQ17061,
SIQ17062,
SIQ17063,
SIQ21030
Tabel 2. Abivahendid elektrilise võimsuse ühiku säilitamisel
Mõõtevahend Tüüp Number Mõõtepiirkond
Kalibraator Fluke 5730A 4191501 22 µV…1100V
10 Hz…1 MHz
9 µA…2,2A
10 Hz…10 kHz
Vooluvõimendi Fluke 52120A 5676703 50 mA…120 A
DC…10 kHz
Võimsuse Calmet CP11B 26088 (0,5…560) V
kalibraator 1 mA…120 A
(40…500) Hz
4. Jälgitavusahel
Diskreetimisvattmeetri komponendid on kalibreeritud vastavate etalonide suhtes, kasutades
astmelist kalibreerimisprotseduuri ja diskreetimismeetodit. Lihtsustatud elektrilise võimsuse
mõõtmise jälgitavusahel on esitatud joonisel 2. Mõõtevahendid, mis on vajalikud mõõtmise
jälgitavuse tagamiseks, on kalibreeritud Eesti metroloogia keskasutuses AS Metrosert ja Tšehhi
metroloogiainstituudis CMI.
4
Joonis 2. Elektrilise võimsuse mõõtmise jälgitavuse skeem
5. Mõõtevõime
Elektrilise võimsuse riigietaloni aparatuur võimaldab osutada kalibreerimisteenust tabelis 3
esitatud mõõteulatustes. Kalibreerimisel kasutatakse juhendit KJ/EE-5.1 „Elektrivõimsuse
allikad ja mõõturid“.
Tabel 3. Elektrilise võimsuse riigietaloni kalibreerimis- ja mõõtevõime
Mõõdetav suurus Mõõtepiirkond Laiendmääramatus
(k = 2)
Aktiivvõimsus, P** (0…20) kW (70...160) μW/VA
Näivvõimsus, S** (0…20) kVA*** (70...160) μVA/VA
Reaktiivvõimsus, Q** (0…20) kvar (70...160) μvar/VA
**Elektrilist võimsust (aktiiv-, näiv- ja reaktiivvõimsust) mõõdetakse järgmistes parameetrite
vahemikes: elektripinge (1...1000) V, elektrivool (0,05...20) A, sagedus (45...65) Hz, võimsustegur
(1…0).
*** Vahelduvvoolu elektrilise võimsuse mõõtühikutena kasutatakse erinimetusega ühikuid
voltamper (V·A) vahelduvvoolu näivvõimsuse ja varr (var) vahelduvvoolu reaktiivvõimsuse
tähistamiseks.
6. Etaloni metroloogilisi omadusi tõendavad dokumendid
5
Riigietaloni kalibreerimis- ja mõõtevõime on akrediteeritud Eesti Akrediteerimiskeskuse poolt
(akrediteerimistunnistus nr K001), Tabel 3.
Mõõtetulemuste tõepärasuse kindlustamiseks etalonlabor on edukalt osalenud aastatel 2018-
2020 toimunud laboritevahelises võrdlusmõõtmises:
• EURAMET.EM-K5.2018 „KEY COMPARISON OF 50 / 60 Hz POWER“, 2019.
Elektrilise võimsuse riigietaloni aparatuuriga on osaletud järgmistes rahvusvahelistes
projektides:
• 15RPT04 TracePQM „Traceability routes for electrical power quality measurements,“
2016-2019.
• 17RPT03 DIG-AC „A digital traceability chain for AC voltage and current,“ 2018-2022.
• 21NRM02 Digital-IT „Metrology for digital substation instrumentation,“ 2022-2025 .
Elektrilise võimsuse riigietaloni aparatuuriga saadud uurimistöö tulemused on avaldatud
eelretsenseeritud teadusajakirjades:
• A. Pokatilov, "A High-Precision and Low-Complexity Framework for Calibration of Stand-Alone
Merging Units," in IEEE Transactions on Instrumentation and Measurement, vol. 74, pp. 1-6, 2025,
Art no. 1013706, doi: 10.1109/TIM.2025.3590834.
• Ireland, Jane; Reuvekamp, Patrick G; Williams, Jonathan; Peral, David; Diaz de Aguilar, Javier;
Sanmamed, Yolander; Šíra, Martin; Mašláň, Stanislav; Rzodkiewicz, Witold; Bruszewski, Patryk;
Sadkowski, G; Sosso, Andrea; Cabral, Vitor; Malmbekk, Helge; Pokatilov, Andrei; Herick, Jonas;
Behr, Ralf; Ozturk, Tezgul; Arifovic, Mehedin; Ilić, Damir (2023). A method for using Josephson
voltage standards for direct characterization of high performance digitizers to establish AC voltage
and current traceability to SI. Measurement Science and Technology, 34 (1), 015003.
• A. Pokatilov, T. Kübarsepp and V. Vabson, "Effect of Keysight 3458A Jitter on Precision of Phase
Difference Measurement," in IEEE Transactions on Instrumentation and Measurement, vol. 65,
no. 11, pp. 2595-2600, Nov. 2016, doi: 10.1109/TIM.2016.2593965.
7. Laboriruum
Elektriliste suuruste mõõtühikute riigietalone säilitatakse ja kasutatakse ASi Metrosert poolt
renditud laboris aadressiga Teaduspargi 8, Tallinn.
Allpool on kirjeldatud Teaduspargi 8 elektriliste suuruste mõõtühikute riigietalonide laboriruumi
tingimusi.
Üldkirjeldus Laboriruum külgneb välisseinaga,
koridoriga, ning aja ja sageduse laboriga.
Laboril on ainult üks sissepääs, selle uks on
lukustatav ja juurdepääs on piiratud arvul
ASi Metroserdi töötajatel.
Labor on ekraneeritud
elektromagnetkiirguse häiringute suhtes
vaskplekiga, sumbuvus sageduse piirkonnas
100 MHz-2 GHz on 60 dB.
Labor on jaotatud vaheseinaga kaheks:
alalispinge ja elektrilise takistuse etalonide
ruum (21,8 m2) ning elektrilise võimsuse
etaloni ruum (22,8 m2). Labor on varustatud
piisava elektrivõimsusega.
6
Aknad: Laboril aknad puuduvad
Ruumi kõrgus: Laboriruumi kõrgus on 2,4 m
Juurdepääs laborile: Juurdepääsu koridoride laius kitsaimas
kohas on 1,6 m
Paiknemine: 2. korrus
Konditsioneerimine On rakendatud eraldi konditsioneerimine
Vahemik: 22,0 °C…24,0 °C
Temperatuuri seadepunkt/stabiilsus:
Stabiilsus: ±1 °C
Vahemik: 40 %…50 %
Suhtelise õhuniiskuse seadepunkt/stabiilsus:
Stabiilsus: ±5 %
Labori kogupindala: 44,6 m2
8. Riigietaloni säilitamise ja kasutamisega seotud personal
Elektrilise võimsuse mõõtühiku riigietaloni säilitamisega ja kasutamisega tegeleb Andrei
Pokatilov, kes on ASi Metrosert töötaja olnud aastast 2002 (Curriculum Vitae vt
https://www.etis.ee/CV/Andrei_Pokatilov/est/). A. Pokatilov on lõpetanud Tallinna
Tehnikaülikooli elektroonika ja biomeditsiinitehnika erialal ning kaitses samas valdkonnas
tehnikamagistri kraadi 2003. a. ning filosoofiadoktori (elektroonika) kraadi 2008. a.
A. Pokatilov töötab ASis Metrosert elektriliste suuruste valdkonna vanemteadurina. Ta on läbi
katsetanud ja töösse juurutanud kõik elektrilise võimsuse mõõtühiku etaloni koosseisu kuuluvad
mõõte- ja abivahendid, erilist rõhku on ta pööranud seadmete töö automatiseerimisele.
A. Pokatilov on osalenud lektorina elektriliste mõõtmiste alal mitmel siseriiklikul seminaril ja
koolitusel. A. Pokatilov on EURAMETi elektriliste suuruste ning magnetismi tehnilise komitee
Eesti esindaja.
9. Riigietaloni säilitamise ja kasutamise tasuvusanalüüs
Aastatel 2023-2025 on Metrosert investeerinud elektrilise võimsuse riigietaloni arendusprojekti
raames põhivara ehk seadmete soetamiseks 12 000 eurot ja väikevahendite soetamiseks ca
20 000 eurot, investeerimiseks vajalikud vahendid pärinevad peamiselt majandus- ja
kommunikatsiooniministeeriumi teadus- ja arendusrahastusest. Tasuvusanalüüs ei võta arvesse
seadmete amortisatsioonikulu, sest investeeringuteks vajalikud vahendid on Metroserdile
laekunud investeeringu tegemise aastal sihtfinantseeringuga.
Elektrilise võimsuse riigietaloniga teenitav tulu koosneb kahest komponendist. Müügitulu
hõlmab teenuseid nagu kalibreerimine ja mõõtmine, samuti elektrilise võimsusega seotud
konsultatsiooniteenuseid ja ettevõtetele teostatavaid TA-projekte. Tulu teadus- ja
arendusprojektidest on rahvusvahelistest taotlusvoorudest laekuv granditulu teadus- ja
arendustegevusteks. Prognoosid on tehtud 2025. aasta reaalsete andmete alusel.
7
Elektrilise võimsuse riigietaloni kulude peamise osa moodustavad tööjõukulud, arvestatud
kolmandik teaduri palgakulust, võttes arvesse iga-aastast võimalikku korrektuuri. Teise
kulukomponendi moodustavad investeeringud, mis on vajalikud valdkonna edasiseks
arendustegevuses. Otsekulude hulgas on erinevad väikevahendid ja materjalid igapäevase töö
elluviimiseks. Üldkuludes on lisaks pindade ja administratiivkuludele ka kõik muud kulud, nt
tarkvara, side, laborite koristus, elekter ja soojus jne. Üldkulude määraks on arvestatud 25%
kuludest. Kulude ja tulude prognoos on esitatud tabelis 4.
Kulude ja tulude prognoos puudutab ainult otseselt AS Metroserdi tegevusega seotud kulusid ja
tulusid, kuid ei hõlma tulu, mida saavad AS Metroserdi teenuseid kasutavad ettevõtted
paranenud täpsusega kalibreerimisteenuse, TA-nõustamise vms teenuse osutamise
tulemusena. See tulu ületab tõenäoliselt oluliselt AS Metroserdi poolt teenitavat otsest tulu
teenustest.
Tabel 4. Elektrilise võimsuse riigietaloni tulude ja kulude prognoos
2026 2027 2028 2029 2030
Tulud 15000 31000 37100 43310 49641
Teenuste müük (konsultatsioon ja 10000 11000 12100 13310 14641
mõõteteenused)
Tulu rahvusvahelistest TA-projektidest 5000 20000 25000 30000 35000
Kulud -51108 -55696 -60702 -66163 -72121
Valdkonna otsekulud -8000 -8800 -9680 -10648 -11713
Personaliga seotud kulud -20886 -22557 -24361 -26310 -28415
Valdkonna arendamiseks vajalikud -15000 -16500 -18150 -19965 -21962
investeeringud
Üldkulud 25% (sh pindadega seotud -7222 -7839 -8510 -9240 -10032
kulud, admin kulud)
Kokku -36108 -24696 -23602 -22853 -22480
8
LISA tunnistusele nr K001
ANNEX to the certificate No K001
Leht/Page 1/30
Lisa kehtib perioodil 09.07.2025 kuni 22.03.2029
This annex is valid from 09.07.2025 to 22.03.2029
LISA AS Metrosert akrediteerimistunnistusele nr K001
ANNEX to the accreditation certificate No K001 of Metrosert Ltd
1. Kalibreerimis- ja mõõtevõime akrediteerimisulatuses on:
Calibration and measurement capability (CMC) in accreditation scope is:
Labori asukoht: Riigietalonilabor, Teaduspargi 8, Tallinn
Location of laboratory: National Standard Laboratory, Teaduspargi 8, Tallinn
Mõõdetav suurus / Laiendmääramatus*
Nimiväärtus või Meetodi lühikirjeldus ja märkused
Nr kalibreerimisobjekt Expanded
mõõtepiirkond Brief description of measurement
No Measured quantity / calibration Measurement
Nominal value or range procedure and remarks
object Uncertainty*
Pikkus / Length
(0,5…100) mm (0,05 + 0,5 × L) µm Võrdlemine etalonotsmõõduga
Comparison with standard gauge block
Otsmõõdud (100…500) mm (0,2 + 0,9 × L) µm
1 L – pikkus meetrites / length in meters
Length measures
KJ/EP-1.03 vers 1.03
(500…1000) mm (0,2 + 2 × L) μm (EVS-EN ISO 3650:1999)
Võrdlemine laserinterferomeetriga
Pikkusmõõdud Comparison with laser interferometer
2 1 mm…120 m (0,06 + 0,015 × L) mm
Line measures of length L – pikkus meetrites / length in meters
MSKJ 039 vers 4
LISA tunnistusele nr K001
ANNEX to the certificate No K001
Leht/Page 2/30
Lisa kehtib perioodil 09.07.2025 kuni 22.03.2029
This annex is valid from 09.07.2025 to 22.03.2029
Mõõdetav suurus / Laiendmääramatus*
Nimiväärtus või Meetodi lühikirjeldus ja märkused
Nr kalibreerimisobjekt Expanded
mõõtepiirkond Brief description of measurement
No Measured quantity / Measurement
Nominal value or range procedure and remarks
calibration object Uncertainty*
Mass / Mass
1; 2; 5; 10; 20 mg 0,0020 mg
50 mg 0,0030 mg
100 mg 0,0040 mg
200 mg 0,0050 mg
500 mg 0,0060 mg
1g 0,0030 mg
2g 0,0040 mg
5g 0,0050 mg
Etalonvihi massi leppeline 10 g 0,0060 mg Asendusmeetod
väärtus 20 g 0,0080 mg Substitution method
3
Conventional mass of standard 50 g 0,010 mg KJ/EM-01 vers 5
weight 100 g 0,015 mg (OIML R 111-1-e04)
200 g 0,030 mg
500 g 0,075 mg
1 kg 0,100 mg
2 kg 0,50 mg
5 kg 1,5 mg
10 kg 2,0 mg
20 kg 4,0 mg
50 kg 15 mg
LISA tunnistusele nr K001
ANNEX to the certificate No K001
Leht/Page 3/30
Lisa kehtib perioodil 09.07.2025 kuni 22.03.2029
This annex is valid from 09.07.2025 to 22.03.2029
Mõõdetav suurus / Laiendmääramatus*
Nimiväärtus või Meetodi lühikirjeldus ja märkused
Nr kalibreerimisobjekt Expanded
mõõtepiirkond Brief description of measurement
No Measured quantity / calibration Measurement
Nominal value or range procedure and remarks
object Uncertainty*
Temperatuur / Temperature
-196 °C 0,080 °C
Võrdlusmeetod
(-80…-40) °C 0,040 °C Comparison method
(-40…+200) °C 0,0080 °C KJ/ET-1.2 vers 2
(DKD-R 5-1)
Etalonplaatina (+200…+400) °C 0,040 °C
takistustermomeetrid ja
tööstuslikud plaatina -38,8344 °C (Hg) 0,0035 °C
4
takistustermomeetrid 0,01 °C (H2O) 0,0010 °C
SPRT and industrial resistance Kalibreerimine kinnispunktis
thermometers 29,7646 °C (Ga) 0,0020 °C
Fixed point calibration
156,5985 °C (In) 0,0030 °C KJ/ET-1.2 vers 2
(DKD-R 5-1)
231,928 °C (Sn) 0,0049 °C
419,527 °C (Zn) 0,0066 °C
-15 °C…+120 °C (1,0…2,0) ºC Võrdlusmeetod / Comparison method
Termokaamerad
5 KJ/ET-3.01 vers 2
Thermovisors +120 °C…+500 °C (2,0…5,0) °C (OIML R 141:2008)
Elektrilised suurused / Electrical quantities
10 V; 1 V 1,0 µV/V
(10…100) mV 5×10-6 × Um + 0,1 µV Võrdlusmeetod
Alalispinge mõõdud (100…1000) mV 1×10-6 × Um + 0,5 µV
6 Comparison method
DC voltage measures (1…10) V 1×10-6 × Um + 2 µV KJ/EE-1.3 vers 3
(10…100) V 3×10-6 × Um
(100…1000) V 4×10-6 × Um
LISA tunnistusele nr K001
ANNEX to the certificate No K001
Leht/Page 4/30
Lisa kehtib perioodil 09.07.2025 kuni 22.03.2029
This annex is valid from 09.07.2025 to 22.03.2029
Mõõdetav suurus / Laiendmääramatus*
Nimiväärtus või Meetodi lühikirjeldus ja märkused
Nr kalibreerimisobjekt Expanded
mõõtepiirkond Brief description of measurement
No Measured quantity / calibration Measurement
Nominal value or range procedure and remarks
object Uncertainty*
(1…10) mΩ 5,0 μΩ/Ω Võrdlusmeetod
Etalontakistid
7 (10…100) mΩ 2,0 μΩ/Ω Comparison method
Standard resistors
100 mΩ…100 kΩ 1,0 μΩ/Ω KJ/EE-2.4 vers 4
(0…20) kW (70…160) μW/VA
(0…20) kVA (70…160) μVA/VA
Elektrivõimsuse allikad ja (0…20) kvar (70…160) μvar/VA
mõõturid, vahelduvvool (45…65) Hz
Power sources and meters, AC (1…1000) V
(0,05…20) A
PF (1…0)
Voolu ja pinge signaali kuju: f1 = 50 Hz põhiharmoonilise suhtes
Current and voltage waveform: harmoonilised / harmonics / in relation to
1…50 fundamental harmonic
pinge harmoonilised Võrdlusmeetod
8 voltage harmonics (10…500) V 100 µV/V Comparison method
KJ/EE-5.1 vers 1
voolu harmoonilised
current harmonics (0,5…5) A 100 µA/A
Pinge harmooniliste
kogumoonutused THDu
Total harmonics distortion of
(0…100) %
voltage THDu
(10…500) V 0,03 %
Voolu harmooniliste
(0,5…5) A
kogumoonutused THDi
Total harmonics distortion of
current THDi
LISA tunnistusele nr K001
ANNEX to the certificate No K001
Leht/Page 5/30
Lisa kehtib perioodil 09.07.2025 kuni 22.03.2029
This annex is valid from 09.07.2025 to 22.03.2029
Labori aadress: Teaduspargi 8, Tallinn
Location of laboratory: Teaduspargi 8, Tallinn
Mõõdetav suurus / Laiendmääramatus*
Meetodi lühikirjeldus ja märkused
Nr kalibreerimisobjekt Nimiväärtus või mõõtepiirkond Expanded
Brief description of measurement
No Measured quantity / Nominal value or range Measurement
procedure and remarks
calibration object Uncertainty*
Pikkus / Length
Võrdlemine etalonotsmõõduga
Comparison with standard gauge block
Otsmõõdud (0,5…100) mm (0,07 + 0,6 × L) μm
9 L – pikkus meetrites / length in meters
Gauge blocks (100…1000) mm (0,2 + 2 × L) μm
KJ/EP-1.03 vers 1.03
(ISO 3650:1998)
Võrdlusmeetod
Joonmõõdud Comparison method
10 1 mm…120 m (0,06 + 0,015 × L) mm
Line measures of length L – pikkus meetrites / length in meters
MSKJ 039 vers 4
Võrdlemine etalonpikkusmõõtudega
Comparison with standard measures
Pikkusmõõturid ja -mõõdud
L – pikkus meetrites / length in meters
Length measuring (0,01…1000) mm (0,5 + 5 × L) μm
11 MSKJ 040 vers 3; MSKJ 041 vers 3; MSKJ
instruments, material (1000…2500) mm (10 + 5 × L) μm
042 vers 3; MSKJ 054 vers 2
measures of length
EURAMET cg-2 vers 2.1
EURAMET cg-6 vers 3.0
Võrdlemine etalonmõõtudega
Laserkaugusmõõturid
12 (0,01…40) m (1,0…2,0) mm Comparison with standard measures
Laser distance meters
MSKJ 051 vers 2
Võrdlemine etalonmõõtudega
Nurgamõõdud
13 (0…360)º 1,0’’ Comparison with standard measures
Angle gauges
MSKJ 049 vers 1
Kõrvalekalle 90º nurgast,
Võrdlemine etalonmõõtudega
Nurgikud haara pikkusel kuni 800 mm
14 5,0 µm Comparison with standard measures
Rightangles Deviation from 90º angle, side
MSKJ 090 vers 1
length up to 800 mm
LISA tunnistusele nr K001
ANNEX to the certificate No K001
Leht/Page 6/30
Lisa kehtib perioodil 09.07.2025 kuni 22.03.2029
This annex is valid from 09.07.2025 to 22.03.2029
Mõõdetav suurus / Laiendmääramatus*
Meetodi lühikirjeldus ja märkused
Nr kalibreerimisobjekt Nimiväärtus või mõõtepiirkond Expanded
Brief description of measurement
No Measured quantity / Nominal value or range Measurement
procedure and remarks
calibration object Uncertainty*
Võrdlemine etalonmõõtudega
Loodid, kaldemõõturid Comparison with standard measures
15 (0…360)º 1’’ (0,0050 mm/m)
Levels, clinometers Loodi pikkus / Level length ≤ 4 m
MSKJ 091 vers 2
Võrdlemine etalonmõõtudega, kolme
Silindrilised keermekaliibrid, Väliskeere (1…200) mm, samm
traadi meetod ja kahe kuuli meetod
keerme keskläbimõõt (0,3…8) mm
16 3,0 μm Comparison with standard measures,
Pitch diameter of parallel Sisekeere (2,6…200) mm,
three wire and two ball method
thread gauges samm (0,45…8) mm
EURAMET cg-10 vers 2.1
Mass / Mass
1; 2; 5; 10 mg 0,0060 mg
20 mg 0,010 mg
50 mg 0,010 mg
100 mg 0,010 mg
200 mg 0,020 mg
500 mg 0,020 mg
1g 0,030 mg
2g 0,040 mg Asendusmeetod
Vihi massi leppeline väärtus 5g 0,050 mg Substitution method
17
Conventional mass of weight 10 g 0,060 mg MSKJ 012 vers 4
20 g 0,080 mg (OIML R 111-1-e04)
50 g 0,10 mg
100 g 0,10 mg
200 g 0,30 mg
500 g 0,80 mg
1 kg 1,0 mg
2 kg 3,0 mg
5 kg 8,0 mg
LISA tunnistusele nr K001
ANNEX to the certificate No K001
Leht/Page 7/30
Lisa kehtib perioodil 09.07.2025 kuni 22.03.2029
This annex is valid from 09.07.2025 to 22.03.2029
Mõõdetav suurus / Laiendmääramatus*
Meetodi lühikirjeldus ja märkused
Nr kalibreerimisobjekt Nimiväärtus või mõõtepiirkond Expanded
Brief description of measurement
No Measured quantity / Nominal value or range Measurement
procedure and remarks
calibration object Uncertainty*
10 kg 20 mg
20 kg 30 mg
50 kg 250 mg
500 kg 8,0 g
2000 kg 70 g
(1…500) mg 0,0030 mg
500 mg…1 g 0,020 mg Kaalude koormamine vihtidega või
(1…2) g 0,030 mg jõumasinast ja etalonjõuandurist
(2…10) g 0,040 mg koosneva mõõtesüsteemi abil
Mitteautomaatkaalud
(10…20) g 0,050 mg Loading with weights or using testing
18 Non-automatic weighing
(20…50) g 0,060 mg machine and force transducer
instruments
(50…100) g 0,10 mg m – vihtide mass või koormus /
100 g…20 kg 1 × 10-6 × m mass of weights or applied load
(20…5000) kg 2 × 10-5 × m EURAMET cg-18 vers 4.0
(5…50) t 5 × 10-5 × m
Maht ja kulu / Volume and flow
(2…100) μl 0,15 μl
(100…200) μl 0,20 μl
(200…500) μl 0,40 μl Destilleeritud veega täidetud mahumõõdu
(500…1000) μl 0,60 μl kaalumine arvestades vee tihedust antud
(1…5) ml 3,0 μl temperatuuril
(5…50) ml 10 μl Weighing of capacity measure filled with
Mahumõõdud
19 (50…100) ml 20 μl distilled water taking into account density
Capacity measures
(100…250) ml 40 μl of water at given temperature
(250…500) ml 60 μl MSKJ 038 vers 5
(500…1000) ml 150 μl (ISO 4787:2021)
(1…2) l 300 μl (ISO 8655-6:2022)
(2…5) l 0,90 ml
(5…10) l 2,0 ml
LISA tunnistusele nr K001
ANNEX to the certificate No K001
Leht/Page 8/30
Lisa kehtib perioodil 09.07.2025 kuni 22.03.2029
This annex is valid from 09.07.2025 to 22.03.2029
Mõõdetav suurus / Laiendmääramatus*
Meetodi lühikirjeldus ja märkused
Nr kalibreerimisobjekt Nimiväärtus või mõõtepiirkond Expanded
Brief description of measurement
No Measured quantity / Nominal value or range Measurement
procedure and remarks
calibration object Uncertainty*
(10…20) l 4,0 ml
(20…50) l 9,0 ml
(50…100) l 18 ml
(100…200) l 80 ml
(200…300) l 100 ml
Joogiveega täidetud mahumõõdu
(300…500) l 125 ml
kaalumine
(500…1 000) l 250 ml
Weighing of capacity measure filled with
(1 000…2 000) l 500 ml
potable water
(2 000…5 000) l 1200 ml
MSKJ 038 vers 5; MSKJ 022 vers 3
Võrdlusmeetod. Kalibreerimine veega
Vedelike arvestid,
Comparison method. Calibration with
kulumõõturid
20 (0,006…25) m3/h (0,4…0,5) % water
Liquid volume meters. Flow
DN10…DN65
meters
MDK KJ 325 vers 3
Rõhk / Pressure
Võrdlemine etalon
(3,5…202) kPa 6×10-5 × p raskuskolbmanomeetriga või
(0,2…2,5) MPa 5×10-5 × p etalonmanomeetriga
Raskuskolbmanomeetrid
21 (2,5…3,5) MPa 6,5×10-5 × p Comparison with standard pressure
Pressure balances
(3,5…70) MPa 9×10-5 × p balance or standard manometer
(70…140) MPa 1,2×10-4 × p p – rõhk Pa / pressure in Pa
EURAMET cg-3 vers 2.0
(-96…-3,5) kPa 1,5×10-4 × p
(-3,5…3,5) kPa 0,1 Pa + 1,3×10-4 × p
Võrdlusmeetod
Ala- ja ülerõhu (3,5…202) kPa 6×10-5 × p
Comparison method
22 mõõtevahendid (0,2…2,5) MPa 5×10-5 × p
p – rõhk Pa / pressure in Pa
Vacuum and pressure gauges (2,5…3,5) MPa 6,5×10-5 × p
MSKJ 037 vers 5
(3,5…70) MPa 9×10-5 × p
(70…140) MPa 1,2×10-4 × p
LISA tunnistusele nr K001
ANNEX to the certificate No K001
Leht/Page 9/30
Lisa kehtib perioodil 09.07.2025 kuni 22.03.2029
This annex is valid from 09.07.2025 to 22.03.2029
Mõõdetav suurus / Laiendmääramatus*
Meetodi lühikirjeldus ja märkused
Nr kalibreerimisobjekt Nimiväärtus või mõõtepiirkond Expanded
Brief description of measurement
No Measured quantity / Nominal value or range Measurement
procedure and remarks
calibration object Uncertainty*
Võrdlusmeetod
Absoluutrõhu mõõtevahendid
(3…200) kPa 2,3 Pa + 5,4 × 10-5 × p Comparison method
23 Absolute pressure measuring
(0,2…70) MPa 20 Pa + 1,2 × 10-4 × p p – rõhk Pa / pressure in Pa
instruments
MSKJ 037 vers 5
Temperatuur / Temperature
Termomeetrid (v.a
(-95…0) ºC (0,20…0,050) ºC
termopaarid ja
(>0…100) ºC 0,050 ºC Võrdlemine etalontermomeetriga
infrapunatermomeetrid)
24 (>100…200) ºC (0,060…0,15) ºC Comparison with standard thermometer
Thermometers (excl.
(>200…400) ºC (0,30…0,60) ºC EURAMET cg-8 vers 3.1
thermocouples and radiation
(>400…700) ºC 1,2 ºC EURAMET cg-11 vers 2.0
thermometers)
MDK KJ 303 vers 3
Termopaarid
25 (-95…+1100) ºC (0,60…2,0) ºC
Thermocouples
Infrapunatermomeetrid Võrdlusmeetod / Comparison method
26 (-30…+300) ºC (1,0…2,0) ºC
Radiation thermometers MSKJ 081 vers 3
Võrdlemine etalontermomeetriga
Temperatuuri kalibraatorid (-40…+400) ºC (0,20…0,60) ºC
27 Comparison with standard thermometer
Temperature calibrators (>400…1100) ºC (1,2…2,0) ºC
EURAMET cg-13 vers 4.0
Optilised suurused / Optical quantities
(5…15) lx 5,0 % Võrdlusmeetod
Luksmeetrid
28 (15…2000) lx 2,3 % Comparison method
Luxmeters
(>2000…5000) lx 5,0 % MDK KJ 321 vers 4
T = (1…100) %
Lainepikkustel / at wavelengths (0,10…0,40) %T
Võrdlusmeetod
Valgusfiltrid (250…900) nm
29 Comparison method
Filters spektri tipu lainepikkus / peak MSKJ 062 vers 3
wavelength 0,3 nm
(240…880) nm
LISA tunnistusele nr K001
ANNEX to the certificate No K001
Leht/Page 10/30
Lisa kehtib perioodil 09.07.2025 kuni 22.03.2029
This annex is valid from 09.07.2025 to 22.03.2029
Mõõdetav suurus / Laiendmääramatus*
Meetodi lühikirjeldus ja märkused
Nr kalibreerimisobjekt Nimiväärtus või mõõtepiirkond Expanded
Brief description of measurement
No Measured quantity / Nominal value or range Measurement
procedure and remarks
calibration object Uncertainty*
XYZ värviruum / color space
0 ≤ X , Y , Z ≤ 100 0,6…1,0
Võrdlusmeetod
Värvimõõturid ja -mõõdud CIELab värviruum / color space
30 Comparison method
Color meters and measures 0 ≤ L * ≤ 100 0,6…5
MSKJ 073 vers 1
-128 ≤ a * ≤ +127 2…20
-127 ≤ b * ≤ +127 1…10
Elektrilised suurused / Electrical quantities
Võrdlusmeetod / Comparison method
1 μV…100 mV 0,5 μV + 5 × 10-6 × U
Alalispinge mõõdud ja U – mõõdetava pinge väärtus / value of
100 mV…1 V 0,5 μV + 2 × 10-6× U
mõõturid measurable voltage
31 1 V…10 V 2 μV + 1 × 10-6× U
DC voltage measures and EURAMET cg-15 vers 3.0
10 V…100 V 10 μV + 4 × 10-6 × U
meters MSKJ 503 vers 4
100 V…1 kV 0,4 mV + 1 × 10-5 × U
MSKJ 016 vers 2
1 nA…1 mA 0,5 nA + 5 × 10-6 × I
Võrdlusmeetod
(1…10) mA 5 nA + 8 × 10-6 × I
Comparison method
(10…100) mA 0,08 µA + 1 × 10-5 ×I
Alalisvoolu mõõdud ja I – mõõdetava alalisvoolu väärtus /
(0,1…1) A 0,8 µA + 1 × 10-5 × I
32 mõõturid value of measurable DC current
(1…10) A 8 µA + 2 × 10-5 × I
DC current measures, meters EURAMET cg-15 vers 3.0
(10…100) A 10 µA + 5 × 10-5 × I
MSKJ 016 vers 2
(100…220) A 0,1 mA + 5 × 10-4 × I
MSKJ 503 vers 4
220 A…1 kA (1,2…2,0) %
(0…20) kW (120…450) μW/VA
(0…20) kVA (120…450) μVA/VA
Elektrivõimsuse allikad ja (0…20) kvar (120…450) μvar/VA Võrdlusmeetod
mõõturid, vahelduvvool Tingimustel / At conditions Comparison method
33
Power sources and meters, f = (45…65) Hz MSKJ 507 vers 4
AC U = (1…1000) V KJ/EE-5.1 vers 1
I = (0,05…20) A
PF (1…0)
LISA tunnistusele nr K001
ANNEX to the certificate No K001
Leht/Page 11/30
Lisa kehtib perioodil 09.07.2025 kuni 22.03.2029
This annex is valid from 09.07.2025 to 22.03.2029
Mõõdetav suurus / Laiendmääramatus*
Meetodi lühikirjeldus ja märkused
Nr kalibreerimisobjekt Nimiväärtus või mõõtepiirkond Expanded
Brief description of measurement
No Measured quantity / Nominal value or range Measurement
procedure and remarks
calibration object Uncertainty*
0,1 mV…20 V
f = 10 Hz…1 MHz Võrdlusmeetod
(20…200) V Comparison method
Vahelduvpinge mõõdud ja f = 10 Hz…100 kHz f – sagedusvahemik / frequency range
34 mõõturid (0,002…1,0) % EURAMET cg-15 vers 3.0
AC voltage measures, meters (200…750) V EURAMET cg-7 vers 1.0
f = 15 Hz…100 kHz MSKJ 507 vers 4
(750…1000) V MSKJ 016 vers 2
f = 15 Hz…30 kHz
10 µA…11 A
Võrdlusmeetod
f = 10 Hz…5 kHz
Comparison method
Vahelduvvoolu mõõdud ja
10 µA…100 A f – sagedusvahemik / frequency range
35 mõõturid (0,004…1) %
f = 45 Hz…1 kHz EURAMET cg-15 vers 3.0
AC current measures, meters
MSKJ 507 vers 4
10 µA…3 kA
MSKJ 016 vers 2
f = 50 Hz
Z=(0,01 Ω…110 kΩ) Võrdlusmeetod / Comparison method
Vahelduvvoolu takistuse ja
f = 20 Hz…1 MHz; (0,01…1,3) % Testvool: / test current: (25 mA…30 A)
impedantsi mõõdud ja
cos φ >0,95 f – sagedusvahemik / frequency range
36 mõõturid
MSKJ 015 vers 3
AC resistance and impedance Z=(25 mΩ…1,8 kΩ)
5,0 mΩ…10 Ω MSKJ 016 vers 2
measures, meters f = 50 Hz; cos φ >0,95 (EN 61557-1-6:2007)
1 pF…1 nF
f = 50 Hz…1 MHz
Mahtuvuse mõõdud ja 1 nF...100 nF Võrdlusmeetod
mõõturid f = 50 Hz...20 kHz Comparison method
37 (0,004…0,10) %
Capacitance measures, 100 nF...1 µF f – sagedusvahemik / frequency range
meters f = 50 Hz...8 kHz MSKJ 015 vers 3
1 µF...100 µF
f = 50 Hz...1 kHz
LISA tunnistusele nr K001
ANNEX to the certificate No K001
Leht/Page 12/30
Lisa kehtib perioodil 09.07.2025 kuni 22.03.2029
This annex is valid from 09.07.2025 to 22.03.2029
Mõõdetav suurus / Laiendmääramatus*
Meetodi lühikirjeldus ja märkused
Nr kalibreerimisobjekt Nimiväärtus või mõõtepiirkond Expanded
Brief description of measurement
No Measured quantity / Nominal value or range Measurement
procedure and remarks
calibration object Uncertainty*
0,1 mΩ 0,010 μΩ
1 mΩ 0,010 μΩ
10 mΩ 0,050 μΩ
100 mΩ 0,20 μΩ
1Ω 2,0 μΩ
10 Ω 0,020 mΩ
Üheväärtuselised alalispinge Võrdlusmeetod
100 Ω 0,20 mΩ
takistusmõõdud Comparison method
38 1 kΩ 2,0 mΩ
DC resistance measures: MSKJ 014 vers 5
10 kΩ 0,020 Ω
specific values KJ/EE-2.4 vers 4
100 kΩ 0,20 Ω
1 MΩ 6,0 Ω
10 MΩ 0,10 kΩ
100 MΩ 1,4 kΩ
1 GΩ 0,018 MΩ
10 GΩ 0,30 MΩ
(0,1…1) mΩ 0,05 µΩ + 3 × 10-5 × R
(1…10) mΩ 0,05 µΩ + 1 × 10-5 × R
(10…100) mΩ 0,1 µΩ + 5 × 10-6 × R
(0,1…1) Ω 0,2 µΩ + 2 × 10-6 × R Võrdlusmeetod
(1…10) Ω 2 µΩ + 2 × 10-6 × R Comparison method
Mitmeväärtuselised (10…100) Ω 0,02 mΩ + 2 × 10-6 × R R – mõõdetava takistuse väärtus /
alalispinge takistusmõõdud ja (0,1…1) kΩ 0,2 mΩ + 2 × 10-6 × R value of measurable resistance
39 -mõõturid EURAMET cg-15 vers 3.0
(1…10) kΩ 2 mΩ + 2 × 10-6 × R
Variable DC resistance MSKJ 014 vers 5
measures and meters (10…100) kΩ 0,02 Ω + 6 × 10-6 × R MSKJ 016 vers 2
(0,1…1) MΩ 0,6 Ω + 1 × 10-5 × R KJ/EE-2.4 vers 4
(1…10) MΩ 9 Ω + 2 × 10-5 × R (EN 61557-1-6:2007)
(10…100) MΩ 0,12 kΩ + 2 × 10-5 × R
(0,1…1) GΩ 1,9 kΩ + 5 × 10-5 × R
(1…40) GΩ 160 kΩ + 3 × 10-4 × R
LISA tunnistusele nr K001
ANNEX to the certificate No K001
Leht/Page 13/30
Lisa kehtib perioodil 09.07.2025 kuni 22.03.2029
This annex is valid from 09.07.2025 to 22.03.2029
Mõõdetav suurus / Laiendmääramatus*
Meetodi lühikirjeldus ja märkused
Nr kalibreerimisobjekt Nimiväärtus või mõõtepiirkond Expanded
Brief description of measurement
No Measured quantity / Nominal value or range Measurement
procedure and remarks
calibration object Uncertainty*
(1,0…59,5) MS/m
Elektrijuhtivuse mõõdud Võrdlusmeetod
DC (0,2…0,7) %
40 Electrical conductivity Comparison method
Sagedustel / At frequencies
measures KJ/EE-4.0 vers 1
(60; 120; 240; 480) kHz (0,6…1,4) %
Kõrgepinge allikad ja Väljundpinge / Output voltage
mõõturid, alalispinge (1…30) kV
41 (0,02…0,05) %
High voltage sources and Sisendpinge / Input voltage
meters, DC (1…10) kV Võrdlusmeetod
Comparison method
Väljundpinge / Output voltage f – sagedusvahemik / frequency range
Kõrgepinge allikad ja
(1…30) kV MSKJ 504 vers 2
mõõturid, vahelduvpinge
42 Sisendpinge / Input voltage (0,2…0,4) %
High voltage sources and
(1…10) kV
meters, AC
f = (45…65) Hz
Sagedus ja aeg / Frequency and time
Sagedusmõõdud, 10 MHz 8×10-11 × f
signaalallikad
43
Frequency measures, signal
0,001 Hz…8 GHz (1×10-5…1×10-10) × f Võrdlusmeetod
sources
Comparison method
t – aeg / time, s
44 Periood / Period (1/f) 125 ps…1000 s (1×10-5…1×10-10) × t f – sagedus / frequency, Hz
Ajaintervalli MSKJ 069 vers 4
mõõdud/mõõturid MSKJ 506 vers 2
45 (10…999999) s ≥0,050 s MSKJ 016 vers 2
Time interval measures,
meters EURAMET cg-7 vers 1.0
NIST SP 960-12
10 MHz 8×10-11 × f
Sagedusmõõturid
46
Frequency meters 0,001 Hz…2,2 GHz (2×10-5…1×10-10) × f
LISA tunnistusele nr K001
ANNEX to the certificate No K001
Leht/Page 14/30
Lisa kehtib perioodil 09.07.2025 kuni 22.03.2029
This annex is valid from 09.07.2025 to 22.03.2029
Mõõdetav suurus / Laiendmääramatus*
Meetodi lühikirjeldus ja märkused
Nr kalibreerimisobjekt Nimiväärtus või mõõtepiirkond Expanded
Brief description of measurement
No Measured quantity / Nominal value or range Measurement
procedure and remarks
calibration object Uncertainty*
Müra / Noise
94 dB; 104 dB; 114 dB
sagedustel/at frequencies
31,5 Hz; 63,0 Hz; 125 Hz;
250 Hz; 500 Hz; 1 kHz; 2 kHz; Võrdlusmeetod
Müramõõturid ja kalibraatorid
4 kHz; 8 kHz; 12,5 kHz; Comparison method
47 Sound level meters and (0,10…1,0) dB
16 kHz MSKJ 064 vers 4
calibrators
EN 61672-3:2013
(10…140) dB
sagedustel/at frequencies
63 Hz…16 kHz
Füüsikalis-keemilised suurused / Physicochemical quantities
Vees lahustunud hapniku Võrdlusmeetod
48 sisalduse mõõturid (6…13) mg/l 0,10 mg/l Comparison method
Dissolved oxygen meters MSKJ 092 vers 2
Mootorsõidukite heitgaaside CO (0…7) % vol
Võrdlusmeetod
analüsaatorid CO2 (0…16) % vol
49 2 %, Min 0,01% vol Comparison method
Instruments for measuring O2 (0…21) % vol
OIML R 99-e08
vehicle exhaust emissions HC (0…2000) 10-4 % vol
Võrdlusmeetod
CO2 mõõturid
50 (200…10000) ppm (30…250) ppm Comparison method
CO2 meters
MSKJ 082 vers 1
Võrdlemine etalontihedusmõõturiga või
etalonainega
Vedelike tihedusmõõturid (0,00010…0,0070) Comparison with standard density meter
51 (0,650…1,840) g/cm3
Liquid density meters g/cm3 or reference materials
MDK KJ 064 vers 4
MDK KJ 320 vers 5
LISA tunnistusele nr K001
ANNEX to the certificate No K001
Leht/Page 15/30
Lisa kehtib perioodil 09.07.2025 kuni 22.03.2029
This annex is valid from 09.07.2025 to 22.03.2029
Mõõdetav suurus / Laiendmääramatus*
Meetodi lühikirjeldus ja märkused
Nr kalibreerimisobjekt Nimiväärtus või mõõtepiirkond Expanded
Brief description of measurement
No Measured quantity / Nominal value or range Measurement
procedure and remarks
calibration object Uncertainty*
(10…95) %rh
(1,5…2,5) %rh
(20…25) °C Võrdlusmeetod kliimakapis
Comparison method in a climate chamber
Suhtelise õhuniiskuse (10…95) %rh MSKJ 058 vers 4
(2,5…5,0) %rh
mõõturid (10…20) °C; (25…40) °C
52
Relative air humidity
measuring devices (5…95) %rh
(0,6…1,2) %rh Võrdlusmeetod niiskusgeneraatoris
(10…25) °C
Comparison method in a humidity
(5…90) %rh generator
(1,3…2,3) %rh MSKJ 058 vers 4
(25…60) °C
Liikumisparameetrid / Motion parameters
Sõidukite kiirendus- ja
Staatiline nurgameetod
aeglustusmõõturid
53 (0...9,81) m/s2 0,02 m/s2 Static angular method
Vehicle accelerometers and
MSKJ 094 vers 1
decelerometers
LISA tunnistusele nr K001
ANNEX to the certificate No K001
Leht/Page 16/30
Lisa kehtib perioodil 09.07.2025 kuni 22.03.2029
This annex is valid from 09.07.2025 to 22.03.2029
Labori aadress: Spektri 6, Tartu
Location of laboratory: Spektri 6, Tartu
Mõõdetav suurus / Laiendmääramatus*
Nimiväärtus või Meetodi lühikirjeldus ja märkused
Nr kalibreerimisobjekt Expanded
mõõtepiirkond Brief description of measurement
No Measured quantity / Measurement
Nominal value or range procedure and remarks
calibration object Uncertainty*
Pikkus / Length
Võrdlusmeetod
Joonmõõdud Comparison method
54 1 mm…50 m (0,1 + 0,05 L) mm
Line measures of length L – pikkus meetrites / length in meters
MSKJ 039 vers 4
Pikkusmõõturid ja - Võrdlemine etalonpikkusmõõtudega
mõõdud Comparison with standard measures
(0,01…1000) mm (0,5 + 5 L) μm
55 Length measuring L – pikkus meetrites / length in meters
(>1000…2000) mm (40 + 5 L) μm
instruments, material MSKJ 040 vers 3; MSKJ 041 vers 3; MSKJ
measures of length 042 vers 3
Võrdlemine etalonmõõtudega
Loodid, kaldemõõturid
56 (0…360)º 10’’ (0,050 mm/m) Comparison with standard measures
Levels, clinometers
MSKJ 091 vers 2
Võrdlemine etalonmõõtudega
Laserkaugusmõõturid
57 (0,01…20) m (2,0…3,0) mm Comparison with standard measures
Laser distance meters
MSKJ 051 vers 2
Mass / Mass
(1; 2; 5; 10; 20; 50) mg 0,020 mg
(100; 200; 500) mg 0,050 mg
1g 0,030 mg
Vihi massi leppeline Asendusmeetod
2g 0,040 mg
väärtus Substitution method
58 5 g, 10 g 0,050 mg
Conventional mass of OIML R 111-1-e04
20 g, 50 g 0,080 mg
standard weight MSKJ 012 vers 4
100 g 0,15 mg
200 g 0,30 mg
500 g 2,5 mg
LISA tunnistusele nr K001
ANNEX to the certificate No K001
Leht/Page 17/30
Lisa kehtib perioodil 09.07.2025 kuni 22.03.2029
This annex is valid from 09.07.2025 to 22.03.2029
Mõõdetav suurus / Laiendmääramatus*
Nimiväärtus või Meetodi lühikirjeldus ja märkused
Nr kalibreerimisobjekt Expanded
mõõtepiirkond Brief description of measurement
No Measured quantity / Measurement
Nominal value or range procedure and remarks
calibration object Uncertainty*
1 kg 15 mg
2 kg 30 mg
5 kg 25 mg
10 kg 50 mg
20 kg 100 mg
500 kg 8,0 g
(1…100) mg 0,010 mg
100 mg…1 g 0,020 mg Kaalude koormamine vihtidega
Mitteautomaatkaalud (1…10) g 0,040 mg Loading with weights
59 Non-automatic weighing (10…50) g 0,060 mg m – kasutatavate vihtide mass /
instruments (50…100) g 0,10 mg mass of weights
100 g…20 kg 1×10-6 × m EURAMET cg-18 vers 4.0
(20…5000) kg 2×10-5 × m
Maht ja kulu / Volume and flow
(2…100) μl 0,20 µl
Destilleeritud veega täidetud mahumõõdu
(100…500) μl 0,50 µl
kaalumine arvestades vee tihedust antud
(>0,5…1) ml 1,0 μl
temperatuuril
(>1…10) ml 3,0 μl
Weighing of capacity measure filled with
Mahumõõdud (>10…25) ml 10 μl
60 distilled water taking into account density
Capacity measures (>25…50) ml 20 μl
of water at given temperature
(>50…100) ml 40 μl
MSKJ 038 vers 5
(>100…1000) ml 0,10 ml
(ISO 4787:2021)
(>1…10) l 0,70 ml
(ISO 8655-6:2022)
(>10…200) l 0,10 %
Võrdlusmeetod. Kalibreerimine veega
Comparison method. Calibration with
Vedelike arvestid
61 (0,02…20) m3/h (0,4…0,5) % water
Liquid volume meters
DN15…DN40
MDK KJ 325 vers 3
LISA tunnistusele nr K001
ANNEX to the certificate No K001
Leht/Page 18/30
Lisa kehtib perioodil 09.07.2025 kuni 22.03.2029
This annex is valid from 09.07.2025 to 22.03.2029
Mõõdetav suurus / Laiendmääramatus*
Nimiväärtus või Meetodi lühikirjeldus ja märkused
Nr kalibreerimisobjekt Expanded
mõõtepiirkond Brief description of measurement
No Measured quantity / Measurement
Nominal value or range procedure and remarks
calibration object Uncertainty*
Rõhk / Pressure
(-95…0) kPa 0,25 kPa
(0…40) kPa 0,08 kPa
Ala- ja ülerõhu (>40…140) kPa 0,14 kPa
Võrdlusmeetod
mõõtevahendid (140…700) kPa 0,10 %
62 Comparison method
Vacuum and pressure (0,7…1,4) MPa 1,4 kPa
MSKJ 037 vers 5
gauges (1,4…7) MPa 0,10 %
(7…14) MPa 14 kPa
(14…70) MPa 0,10 %
Temperatuur / Temperature
Termomeetrid (v.a
termopaarid ja
infrapunatermomeetrid) Võrdlemine etalontermomeetriga
63 (-40…+275) °C (0,090…0,30) °C
Thermometers (excl. Comparison with standard thermometer
thermocouples and EURAMET cg-8 vers 3.1
radiation thermometers) MDK KJ 303 vers 3
Termopaarid
64 (-40…+275) °C (0,60…3,0) °C
Thermocouples
Infrapunatermomeetrid Võrdlusmeetod / Comparison method
65 (-30…+150) °C (1,0…2,0) °C
Radiation thermometers MSKJ 081 vers 3
Sagedus ja aeg / Frequency and time
Võrdlusmeetod / Comparison method
Ajaintervalli mõõturid
66 ≥10 s 0,050 s MSKJ 069 vers 4
Time interval meters
NIST SP 960-12
LISA tunnistusele nr K001
ANNEX to the certificate No K001
Leht/Page 19/30
Lisa kehtib perioodil 09.07.2025 kuni 22.03.2029
This annex is valid from 09.07.2025 to 22.03.2029
Mõõdetav suurus / Laiendmääramatus*
Nimiväärtus või Meetodi lühikirjeldus ja märkused
Nr kalibreerimisobjekt Expanded
mõõtepiirkond Brief description of measurement
No Measured quantity / Measurement
Nominal value or range procedure and remarks
calibration object Uncertainty*
Võrdlusmeetod / Comparison method
Tahhomeetrid
67 0,15 Hz…3,5 kHz (6,7 10-3…4,0 10-5) ƒ ƒ – sagedus / frequency, Hz
Tachometers
MSKJ 506 vers 2
Füüsikalis-keemilised suurused / Physicochemical quantities
Etalonniiskusmõõturiga võrdlemine
Õhuniiskuse mõõturid kliimakapis
(10…95) %rh
68 Air humidity measuring (2,0…3,0) %rh Comparison with standard humidity
(20…25) °C
devices transducer in a climate chamber
MSKJ 058 vers 4
Alkomeetrid Võrdlusmeetod / Comparison method
69 (0,00…3,00) mg/l (0,0060…0,20) mg/l
Breath analysers MSKJ 066 vers 2
Liikumisparameetrid / Motion parameters
Dopplereffektiga
kiirusmõõturid Võrdlusmeetod
(20…100) km/h 0,50 km/h
70 Instruments for Comparison method
(>100…320) km/h 0,5 %
measuring the speed of MSKJ 067 vers 3
vehicles, Doppler effect
Laserkiirusmõõturid Võrdlusmeetod labori tingimustes
Laser instruments for (20…100) km/h 0,50 km/h Comparison method in laboratory
71
measuring speed of (>100…320) km/h 0,5 % conditions
vehicles MSKJ 068 vers 2
LISA tunnistusele nr K001
ANNEX to the certificate No K001
Leht/Page 20/30
Lisa kehtib perioodil 09.07.2025 kuni 22.03.2029
This annex is valid from 09.07.2025 to 22.03.2029
Labori asukoht: Sompa 1A, Jõhvi
Location of laboratory: Sompa 1A, Jõhvi
Mõõdetav suurus / Laiendmääramatus*
Nimiväärtus või Meetodi lühikirjeldus ja märkused
Nr kalibreerimisobjekt Expanded
mõõtepiirkond Brief description of measurement
No Measured quantity / Measurement
Nominal value or range procedure and remarks
calibration object Uncertainty*
Pikkus / Length
Võrdlusmeetod
Joonmõõdud Comparison method
72 1 mm…30 m (0,1 + 0,06 L) mm
Line measures of length L – pikkus meetrites / length in meters
MSKJ 039 vers 4
Pikkusmõõturid ja mõõdud
Võrdlemine etalonpikkusmõõtudega
Length measuring
73 (0,5…1000) mm (0,0030…0,020) mm Comparison with standard measures
instruments, material
MSKJ 040 vers 3; MSKJ 041 vers 3
measures of length
Mass / Mass
(10; 20; 50; 100; 200;
500) mg 0,10 mg
1g 0,10 mg
Asendusmeetod
Vihi massi leppeline väärtus 2g 0,12 mg
Substitution method
74 Conventional mass of 5 g; 10 g 0,16 mg
OIML R 111-1-e04
standard weight 20 g; 50 g 0,25 mg
MSKJ 012 vers 4
100 g 0,50 mg
200 g 1,0 mg
500 g 8,0 mg
(1…100) mg 0,010 mg
100 mg…1 g 0,020 mg
Kaalude koormamine vihtidega
(1…10) g 0,040 mg
Mitteautomaatkaalud Loading with weights
(10…50) g 0,060 mg
75 Non-automatic weighing m – kasutatavate vihtide mass /
(50…100) g 0,10 mg
instruments mass of weights
100 g…1 kg 1×10-6 × m
EURAMET cg-18 vers 4.0
(1…20) kg 1×10-5 × m
(20…2000) kg 2×10-5 × m
LISA tunnistusele nr K001
ANNEX to the certificate No K001
Leht/Page 21/30
Lisa kehtib perioodil 09.07.2025 kuni 22.03.2029
This annex is valid from 09.07.2025 to 22.03.2029
Mõõdetav suurus / Laiendmääramatus*
Nimiväärtus või Meetodi lühikirjeldus ja märkused
Nr kalibreerimisobjekt Expanded
mõõtepiirkond Brief description of measurement
No Measured quantity / Measurement
Nominal value or range procedure and remarks
calibration object Uncertainty*
Maht ja kulu / Volume and flow
Destilleeritud veega mahumõõdu
(2…100) μl 0,30 μl
kaalumine arvestades vee tihedust antud
(100…500) μl 0,50 μl
temperatuuril
500 μl…1 ml 1,0 μl
Weighing of capacity measure filled with
Mahumõõdud (1…10) ml 3,0 μl
76 distilled water taking into account density
Capacity measures (10…25) ml 10 μl
of water at given temperatuure
(25…50) ml 20 μl
MSKJ 038 vers 5
(50…100) ml 40 μl
(ISO 4787:2021)
(100…1000) ml 0,20 ml
(ISO 8655-6:2022)
Rõhk / Pressure
(-95…0) kPa 0,25 kPa
(0…40) kPa 0,08 kPa
(>40…140) kPa 0,14 kPa
Ala- ja ülerõhu Võrdlusmeetod
(140…700) kPa 0,10 %
77 mõõtevahendid Comparison method
(0,7…1,4) MPa 1,4 kPa
Vacuum and pressure gauges MSKJ 037 vers 5
(1,4…7) MPa 0,10 %
(7…14) MPa 14 kPa
(14…70) MPa 0,10 %
Temperatuur / Temperature
Võrdlusmeetod
Termomeetrid
78 (-40…+350) ºC (0,10…0,30) ºC Comparison method
Thermometers
MDK KJ 303 vers 3
Sagedus ja aeg / Frequency and time
Võrdlusmeetod
Ajaintervalli mõõturid Comparison method
79 10 s…3600 s 0,10 s
Time interval meters MSKJ 069 vers 4
NIST SP 960-12
LISA tunnistusele nr K001
ANNEX to the certificate No K001
Leht/Page 22/30
Lisa kehtib perioodil 09.07.2025 kuni 22.03.2029
This annex is valid from 09.07.2025 to 22.03.2029
Kalibreerimine väljaspool püsilaborit
On-site calibration
Mõõdetav suurus / Laiendmääramatus*
Nimiväärtus või Meetodi lühikirjeldus ja märkused
Nr kalibreerimisobjekt Expanded
mõõtepiirkond Brief description of measurement
No Measured quantity / Measurement
Nominal value or range procedure and remarks
calibration object Uncertainty*
Pikkus / Length
Pikkuse mõõtemasinad (pideva
Objekti pikkus mm või cm, Võrdlusmeetod
toimega), mõõterattad
loenduri näidu põhjal / 0,05 % Comparison method
80 Length measuring instruments
Length of object in mm or Min 1 mm MSKJ 095 vers 1
(continuous measurement), road
cm indicated by counter (OIML R 66-e85)
measuring wheels
Võrdlemine etalonpikkusmõõtudega
Comparison with standard
measures
Pikkusmõõturid (0,01…1000) mm (1,5 + 5 × L) μm L – pikkus meetrites / length in
81
Length measuring instruments (>1000…2000) mm (10 + 5 × L) μm meters
MSKJ 040 vers 3
MSKJ 041 vers 3
MSKJ 042 vers 3
Võrdlusmeetod
Mõõtejoonlauad, stadiomeetrid, Comparison method
82 mõõtekiilud 1 mm…3 m (0,06 + 0,09 × L) mm L – pikkus meetrites / length in
Rulers, stadiometers, taper gauges meters
MSKJ 039 vers 4
Võrdlemine etalonmõõtudega
Nurgamõõturid Comparison with standard
83 (0…360)º 5,0’’
Angle measuring instruments measures
MSKJ 047 vers 1
Pindepaksusmõõturid Võrdlemine etalonmõõtudega
84 Coating thickness measuring (0,01…3) mm (1,1…10) µm Comparison with standard
instruments measures
LISA tunnistusele nr K001
ANNEX to the certificate No K001
Leht/Page 23/30
Lisa kehtib perioodil 09.07.2025 kuni 22.03.2029
This annex is valid from 09.07.2025 to 22.03.2029
Mõõdetav suurus / Laiendmääramatus*
Nimiväärtus või Meetodi lühikirjeldus ja märkused
Nr kalibreerimisobjekt Expanded
mõõtepiirkond Brief description of measurement
No Measured quantity / Measurement
Nominal value or range procedure and remarks
calibration object Uncertainty*
MSKJ 046 vers 2
Ultraheli paksusmõõturid
(ISO 2178:2016)
85 Ultrasound thickness measuring (0,5…200) mm 10 µm
instruments
Mass / Mass
(1…100) mg 0,010 mg
100 mg…1 g 0,020 mg
(1…10) g 0,040 mg Kaalude koormamine vihtidega
(10…50) g 0,060 mg Loading with weights
Mitteautomaatkaalud
86 (50…100) g 0,10 mg m – kasutatavate vihtide mass /
Non-automatic weighing instruments
100 g…20 kg 1 × 10-6 × m mass of weights
(20…5000) kg 2 × 10-5 × m EURAMET cg-18 vers 4.0
(5…60) t 5 × 10-5 × m
(60…150) t 1 × 10-4 × m
Automaatpiirkaalud, automaatsed
Kaalude koormamine vihtidega
gravimeetrilised annustid, tsüklilise
Loading with weights
toimega summeerkaalud, pideva
m – kasutatavate vihtide mass /
toimega summeerkaalud
mass of weights
87 Automatic catchweighers, automatic 5 g…20 t 5 × 10-5 × m
OIML R 51-e06
gravimetric filling instruments,
OIML R 61-e17
discontinuous totalisers, continuous
OIML R 107-e07
totalizing automatic weighing
OIML R 50-e14
instruments
Kaalude koormamine vihtidega
Loading with weights
Automaatsed raudteekaalud
88 (3…150) t 2 × 10-4 × m m – kasutatavate vihtide mass /
Automatic rail-weighbridges
mass of weights
OIML R 106-e11
LISA tunnistusele nr K001
ANNEX to the certificate No K001
Leht/Page 24/30
Lisa kehtib perioodil 09.07.2025 kuni 22.03.2029
This annex is valid from 09.07.2025 to 22.03.2029
Mõõdetav suurus / Laiendmääramatus*
Nimiväärtus või Meetodi lühikirjeldus ja märkused
Nr kalibreerimisobjekt Expanded
mõõtepiirkond Brief description of measurement
No Measured quantity / Measurement
Nominal value or range procedure and remarks
calibration object Uncertainty*
Kaalude koormamine määratud
massiga sõidukite ülesõitudega
Automaatkaalud liikuva sõiduki
Loading with vehicles in motion
kaalumiseks
89 (1…72) t (0,04…1,0) % which masses is previously
Automatic instruments for weighing
measured
road vehicles in motion
AWICal WIM Guide 2018
OIML R 134-e06
Maht ja kulu / Volume and flow
Min 2 l
Vedelike arvestid; kütusetankurid Mahumeetod, massimeetod
Kulu/flow max 2500 l/min
90 Meters for the measurement of 0,15 % Volume and mass method
Min 2 kg
quantities of liquids fuel dispencers MSKJ 053 vers 4
Kulu/flow max 5000 kg/min
Massimeetod
Liikuvad mõõtemahutid, mis on (5000…20000) l 0,20 % Mass method
püsivalt paigaldatud sõidukile või MSKJ 022 vers 3
91
raudteeveeremile Mahumeetod
Road and rail tanks (500…120000) l 0,20 % Volume method
MSKJ 022 vers 3
Horisontaal- ja vertikaalmahutid
Mahumeetod või geomeetriliste
Horisontal and vertical tanks
mõõtmiste meetod
Mõõtemahutite juurde kuuluvad ning
Volume or geometrical
laadimissõlmi ühendavad
measurement method
92 püsitorustikud 20 l…30000 m3 0,30 %
MSKJ 045 vers 5
Pipelines for measurements
(ISO 7507-4:2010)
associated with tanks
(ISO 12917-1:2017)
and connected to loading or
(ISO 7507-1:2003)
unloading terminals
LISA tunnistusele nr K001
ANNEX to the certificate No K001
Leht/Page 25/30
Lisa kehtib perioodil 09.07.2025 kuni 22.03.2029
This annex is valid from 09.07.2025 to 22.03.2029
Mõõdetav suurus / Laiendmääramatus*
Nimiväärtus või Meetodi lühikirjeldus ja märkused
Nr kalibreerimisobjekt Expanded
mõõtepiirkond Brief description of measurement
No Measured quantity / Measurement
Nominal value or range procedure and remarks
calibration object Uncertainty*
Võrdlemine etalonpikkusmõõduga
Comparison with standard length
Vedelikunivoo mõõturid
measure
93 Measuring devices for measuring the (0,01…30) m (0,5 + 9 × 10-2 × L) mm
L – kõrgus meetrites / height in
level of liquid
meters
MSKJ 048 vers 2
Rõhk / Pressure
(-95…-2,5) kPa 0,10 %, min 0,050 kPa Võrdlusmeetod
Ala- ja ülerõhu mõõtevahendid
94 (-2,5…2,5) kPa 1 Pa Comparison method
Vacuum and pressure gauges
2,5 kPa…70 MPa 0,10 %, min 0,050 kPa MSKJ 037 vers 5
Temperatuur / Temperature
Võrdlusmeetod
Termostaadid, termokapid Comparison method
95 Temperature controlled chambers, (-95…+300) °C (0,10…0,80) °C EURAMET cg-13 vers 4.0
liquid baths and ovens EURAMET cg-20 vers 5.0
MSKJ 080 vers 3
Termomeetrid ja
Võrdlusmeetod
temperatuurimeerikud
96 (-95…+700) °C (0,20…1,5) °C Comparison method
Thermometers and temperature
MDK KJ 303 vers 3
recorders
Võrdlusmeetod
Ahjud
97 (200…1550) °C (2,0…5,0) °C Comparison method
Furnaces
MSKJ 080 vers 3
Võrdlusmeetod
Kliimakapid (10…60) °C 0,30 °C Comparison method
98
Climate chambers (1…95) %rh (1,2…3,0) %rh EURAMET cg-20 vers 5.0
MSKJ 080 vers 3
LISA tunnistusele nr K001
ANNEX to the certificate No K001
Leht/Page 26/30
Lisa kehtib perioodil 09.07.2025 kuni 22.03.2029
This annex is valid from 09.07.2025 to 22.03.2029
Mõõdetav suurus / Laiendmääramatus*
Nimiväärtus või Meetodi lühikirjeldus ja märkused
Nr kalibreerimisobjekt Expanded
mõõtepiirkond Brief description of measurement
No Measured quantity / Measurement
Nominal value or range procedure and remarks
calibration object Uncertainty*
(-50…+1200) °C
Sisend: alalispinge, Võrdlusmeetod
Temperatuurimuundurid
99 takistus 0,50 °C Comparison method
Temperature converters
Input: DC voltage or EURAMET cg-11 vers 2.0
resistance
Jõud ja vääne / Force and torque
Kaalu koormamine vihtidega ja jõu
mõõtmine dünamomeetri ning
spetsiaalrakiste abil
Piduristendid 100 kg…20 t 0,4 % (mass)
100 Loading with weights and
Brake testers (0,5…40) kN (0,5…1,0) %
measuring force using force gauge
and special fixtures
MDK KJ 008 vers 5
Koormamine katsemasinal või
1 N…1 MN 0,10 % vihtidega
Dünamomeetrid, jõuandurid
Loading with testing machine or
101 Dynamometers, force gauges and
weights
transducers
1 MN…2 MN 0,15 % MSKJ 071 vers 4
(ISO 376:2011)
Etalonjõuanduriga võrdlemine või
vihtidega koormamine
1 N…5 kN 0,03 %
Katsemasinad Comparison with standard force
102 (5…1000) kN 0,07 %
Force testing machines transducer or loading with weights
(1…2) MN 0,15 %
MSKJ 070 vers 4
(ISO 7500-1:2018)
Võrdlusmeetod
Comparison method
Väändemõõturid
103 (0,01…3000) N·m (0,1…1,0) % EURAMET cg-14 vers 2.0
Torque measuring devices
MSKJ 072 vers 4
(ISO 6789-1-2:2017)
LISA tunnistusele nr K001
ANNEX to the certificate No K001
Leht/Page 27/30
Lisa kehtib perioodil 09.07.2025 kuni 22.03.2029
This annex is valid from 09.07.2025 to 22.03.2029
Mõõdetav suurus / Laiendmääramatus*
Nimiväärtus või Meetodi lühikirjeldus ja märkused
Nr kalibreerimisobjekt Expanded
mõõtepiirkond Brief description of measurement
No Measured quantity / Measurement
Nominal value or range procedure and remarks
calibration object Uncertainty*
Optilised suurused / Optical quantities
Võrdlusmeetod
Klaaside läbipaistvusmõõturid Läbipaistvus:
104 2,0 %T Comparison method
Window-transmittance meters (5…100) %T
MSKJ 063 vers 4
T = (0…100) % (0,040…0,40) %T
lainepikkustel /
Spektrofotomeetrid,
at wavelengths Võrdlusmeetod
fotokolorimeetrid
105 (250…1000) nm Comparison method
Spectrophotometers
spektri tipu lainepikkus / MSKJ 061 vers 2
Photocolorimeters
peak wavelength 0,30 nm
(240…880) nm
Võrdlusmeetod
Refraktomeetrid (0…65) % mas (0,020…0,070) % mas
106 Comparison method
Refractometers 1,33…1,46 1 × 10-4
MSKJ 057 vers 2
Elektrilised suurused / Electrical quantities
Võrdlusmeetod
1 µV…100 mV 0,5 µV + 5 × 10-6 × U
Comparison method
100 mV…1V 0,5 µV + 2 × 10-6 × U
Alalispinge mõõdud ja mõõturid U – mõõdetava pinge väärtus /
107 1 V…10V 2 µV + 1 × 10-6 × U
DC voltage measures and meters value of measurable voltage
10V…100 V 10 µV + 4 × 10-6 × U
EURAMET cg-15 vers 3.0
100 V…1 kV 0,4 mV + 1 × 10-5 × U
MSKJ 503 vers 4
1 nA…1 mA 0,5 nA + 5 × 10-6 × I
Võrdlusmeetod
(1…10) mA 5 nA + 8 × 10-6 × I
Comparison method
(10…100) mA 0,08 µA + 1 × 10-5 × I
Alalisvoolu mõõdud ja mõõturid I – mõõdetava alalisvoolu väärtus /
108 (0,1…1) A 0,8 µA + 1 × 10-5 × I
DC current measures, meters value of measurable DC current
(1…10) A 8 µA + 2 × 10-5 × I
EURAMET cg-15 vers 3.0
(10…220) A 0,1 mA + 5 × 10-4 × I
MSKJ 503 vers 4
220 A…1 kA (1,2…2,0) %
LISA tunnistusele nr K001
ANNEX to the certificate No K001
Leht/Page 28/30
Lisa kehtib perioodil 09.07.2025 kuni 22.03.2029
This annex is valid from 09.07.2025 to 22.03.2029
Mõõdetav suurus / Laiendmääramatus*
Nimiväärtus või Meetodi lühikirjeldus ja märkused
Nr kalibreerimisobjekt Expanded
mõõtepiirkond Brief description of measurement
No Measured quantity / Measurement
Nominal value or range procedure and remarks
calibration object Uncertainty*
0,1 mV…20 V
f = 10 Hz...1 MHz Võrdlusmeetod
(20…200) V Comparison method
f = 10 Hz...100 kHz f – sagedusvahemik / frequency
(0,01…1,0) % range
(200…750) V EURAMET cg-15 vers 3.0
Vahelduvpinge ja -voolu mõõdud ja f = 15 Hz...100 kHz EURAMET cg-7 vers 1.0
mõõturid MSKJ 507 vers 4
109 (750…1000) V
AC voltage and AC current measures
and meters f = 15 Hz…30 kHz
Võrdlusmeetod
10 µA…11 A;
Comparison method
f = 10 Hz…5 kHz
f – sagedusvahemik / frequency
(0,02…1,0) %
range
10 µA…3 kA
EURAMET cg-15 vers 3.0
f = 50 Hz
MSKJ 507 vers 4
(0,1…1) mΩ 0,05 µΩ + 3 × 10-5 × R
(1…10) mΩ 0,05 µΩ + 1 × 10-5 × R
(10…100) mΩ 0,1 µΩ + 5 × 10-6 × R
(0,1…1) Ω 0,2 µΩ + 2 × 10-6 × R
(1…10) Ω 2 µΩ + 2 × 10-6 × R Võrdlusmeetod
Mitmeväärtuselised alalispinge (10…100) Ω 0,02 mΩ + 2 × 10-6 × R Comparison method
takistusmõõdud ja -mõõturid (0,1…1) kΩ 0,2 mΩ + 2 × 10-6 × R R – mõõdetava takistuse väärtus /
110
DC resistance measures: multi (1…10) kΩ 2 mΩ + 2 × 10-6 × R value of measurable resistance
values; meters (10…100) kΩ 0,02 Ω + 6 × 10-6 × R EURAMET cg-15 vers 3.0
(0,1…1) MΩ 0,6 Ω + 1 × 10-5 × R MSKJ 014 vers 5
(1…10) MΩ 9 Ω + 2 × 10-5 × R
(10…100) MΩ 0,12 kΩ + 2 × 10-5 × R
(0,1…1) GΩ 1,9 kΩ + 5 × 10-5 × R
(1…10) GΩ 160 kΩ + 3 × 10-4 × R
LISA tunnistusele nr K001
ANNEX to the certificate No K001
Leht/Page 29/30
Lisa kehtib perioodil 09.07.2025 kuni 22.03.2029
This annex is valid from 09.07.2025 to 22.03.2029
Mõõdetav suurus / Laiendmääramatus*
Nimiväärtus või Meetodi lühikirjeldus ja märkused
Nr kalibreerimisobjekt Expanded
mõõtepiirkond Brief description of measurement
No Measured quantity / Measurement
Nominal value or range procedure and remarks
calibration object Uncertainty*
Väljundpinge / Output
Kõrgepinge allikad ja mõõturid, voltage
111 alalispinge (1…30) kV (0,06…0,8) %
High voltage sources and meters, DC Sisendpinge / Input voltage
(1…10) kV
Võrdlusmeetod
Comparison method
Väljundpinge / Output
MSKJ 504 vers 2
voltage
Kõrgepinge allikad ja mõõturid,
(1…30) kV
112 vahelduvpinge (0,2…0,9) %
Sisendpinge / Input voltage
High voltage sources, AC
(1…10) kV
f = (45…65) Hz
Sagedus ja aeg / Frequency and time
Sagedusmõõdud
113 1 Hz…1300 MHz (1 × 10-6…1 × 10-8) × f
Frequency measures Võrdlusmeetod
Comparison method
10 ns…2×104 s (10 ns…1,3 × 10-8 × t) t – aeg / time, s
Ajaintervalli mõõdud/mõõturid f – sagedus / frequency, Hz
114 (10…n × 86 400) s
Time interval measures and meters 0,050 s MSKJ 069 vers 4
(n ≤ 30) MSKJ 506 vers 2
Sagedusmõõturid, signaalallikad EURAMET cg-7 vers 1.0
115 0,01 Hz…1300 MHz (1 × 10-1…1 × 10-5) × f
Frequency meters, signal sources
Füüsikalis-keemilised suurused / Physicochemical quantities
Võrdlusmeetod
pH-meetrid
116 pH (2,0…9,3) 0,03 Comparison method
pH-meters
MSKJ 060 vers 4
Mootorsõidukite heitgaaside Neeldumistegur / Võrdlemine etalonfiltriga
117 suitsususe mõõturid Light absorption coefficient 0,025 m-1 Comparison with standard filter
Vehicle exhaust gas opacity meters (0…10) m-1 MSKJ 065 vers 3
LISA tunnistusele nr K001
ANNEX to the certificate No K001
Leht/Page 30/30
Lisa kehtib perioodil 09.07.2025 kuni 22.03.2029
This annex is valid from 09.07.2025 to 22.03.2029
Mõõdetav suurus / Laiendmääramatus*
Nimiväärtus või Meetodi lühikirjeldus ja märkused
Nr kalibreerimisobjekt Expanded
mõõtepiirkond Brief description of measurement
No Measured quantity / Measurement
Nominal value or range procedure and remarks
calibration object Uncertainty*
Võrdlemine etalonainega
Vedelike tihedusmõõturid
118 (0,690…1,620) g/cm3 0,00010 g/cm3 Comparison method
Liquid density meters
MDK KJ 320 vers 5
Võrdlusmeetod
Vedelike elektrijuhtivuse mõõturid 14,94 µS/cm… 0,080 µS/cm…
119 Comparison method
Electrical conductivity meters 24,80 mS/cm 0,080 mS/cm
MSKJ 093 vers 2
*Kalibreerimis- ja mõõtevõime on väljendatud laiendmääramatusena U (k=2). Väärtus protsentides on esitatud protsendina
mõõtetulemusest (kui ei ole märgitud teisiti).
*Calibration and measurement capability is expressed as expanded uncertainty U (k=2). Values expressed as percentage are from
measurement result (if not described directly).
2. Kalibreerimist teostav struktuuriüksus: riigietaloni labor, MTD üksus
Part of legal entity that provides calibration:
3. Labor on akrediteeritud standardi EVS-EN ISO/IEC 17025:2017 nõuete kohaselt
Laboratory is accredited against the requirements of standard EVS-EN ISO/IEC 17025:2017
Märkus: käesolev akrediteerimistunnistuse lisa on välja antud seoses akrediteerimisulatuse laiendamise, kitsendamise, kalibreerimis- ja
mõõtevõime ning selle väljendusviisi täpsustamise ja Tartu labori aadressi muutumisega ning see asendab 09.12.2024 välja antud lisa.
Note: the annex is issued due to the extension and reduction of the accreditation scope, adjustment of calibration and measurement
capability and its presentation, change of the address of laboratory in Tartu and it replaces annex issued on 09.12.2024.
Paavo Ruzitš
Katsetamise, kalibreerimise ja mõõtmise üksuse akrediteerimisjuht
EAK juhataja ülesannetes
Tallinn, 09.07.2025
AG Metrology S.r.l.
Strada San Faustino, 155/N
41124 Modena Italy
Tel. +39 059 3970648
[email protected]
www.agmetrology.it, www.agmetrology.com
Accreditation # 108949
FINAL REPORT N° AG_2024_R_0014 EN
SEQUENTIAL COMPARISON RESULTS
PT2023_017 - 17043T_02_EX
for Standard platinum resistance thermometer
1. REFERENCE LABORATORY
Accredited according to ISO / IEC 17025:2017 by Certificate of accreditation n° LK-002 Slovenska Akreditacija ILAC MRA Signatory
LMK - UNIVERZA V LJUBLJANI, FAKULTETA ZA ELEKTROTEHNIKO
Tržaška cesta 25
SI-1000 Ljubljana - Slovenija
2. DATE OF INTERCOMPARISON
The measurements for this intercomparison were carried out in the period from 10-2023 to 01-2024 with 6 participating laboratories,
who performed measurements on the traveling sample Hart Scientific 5628 sn. 0501 .The reference laboratory specified above,
accredited according to ISO IEC 17025:2017 by Certificate of accreditation n° LK-002 Slovenska Akreditacija ILAC MRA Signatory,
performed measurements before first participanting laboratory and after last participanting laboratory.
3. CONFIDENTIALITY STATEMENT
AG Metrology keeps all data regarding the performance of individual participants, or groups of participants, strictly confidential. Data is
accordingly protected and stored in areas on networks with restricted access. The relationship between results and the laboratories that
submitted them will never be disclosed. Only the laboratory is granted access to its performance through the assigned code number.
4. POLICY STATEMENT
The evaluation reports of AG Metrology’s proficiency testing schemes are provided for the purpose of communicating the proficiency
demonstrated by participants on specific calibrations. The reports are intended to be used in support of demonstrating competence in
calibration, fulfilling quality control requirements as stipulated in written standards on showing such competence, and claims of
calibration and measurement capabilities.
APPROVED BY: DRAWN BY:
Giorgia Calzolari Andrea Meda
Coordinator Technical manager
We welcome your questions, complaints and suggestions for improvement of this test and our operations in general
Report FInale Pagina 1 di 23
PT2023_017 - 17043T_02_EX Final Report Page 1 of 23
AG Metrology S.r.l.
Strada San Faustino, 155/N
41124 Modena Italy
Tel. +39 059 3970648
[email protected]
www.agmetrology.it, www.agmetrology.com
Accreditation # 108949
FINAL REPORT N° AG_2024_R_0014 EN
TABLE OF CONTENTS
1. REFERENCE LABORATORY 1
2. DATE OF INTERCOMPARISON 1
3. CONFIDENTIALITY STATEMENT 1
4. POLICY STATEMENT 1
5. ORGANISATION 3
6. PARTICIPANTS 3
7. PROFICIENCY TESTING SCHEME 3
8. TRAVELLING STANDARD 3
9. QUANTITY TO BE MEASURED 3
10. MEASUREMENT INSTRUCTIONS 3
11. FEEDBACK CONTROL OF THE MEASUREMENT RESULTS 4
12. CORRECTIVE ACTIONS ADOPTED 4
13. DETERMINATION OF REFERENCE VALUES 5
14. STABILITY ASSESMENT 5
15. DETERMINATION OF MEASUREMENT UNCERTAINTY OF REFERENCE VALUES 6
16. RESULTS OF INTERLABORATORY COMPARISON REFERENCE VALUES 7
17. EVALUATION CRITERIA 8
18. DETERMINATION OF CORRESPONDING TEMPERATURE VALUES OF PARTICIPANT LABORATORIES 9
19. RESULTS OF INTERLABORATORY COMPARISON, PARTICIPANT LABS VALUES 10
20. GRAPHICAL PRESENTATION OF ERRORS 16
21. GRAPHICAL PRESENTATION OF THE NORMALIZED ERROR 17
22. COMMENTS AND CONCLUSIONS 23
23. DISCUSSION, COMPLAINS AND APPEAL ON THE RESULTS 23
24. REFERENCES 23
25. AMENDMENT RECORD 23
Report FInale Pagina 2 di 23
PT2023_017 - 17043T_02_EX Final Report Page 2 of 23
AG Metrology S.r.l.
Strada San Faustino, 155/N
41124 Modena Italy
Tel. +39 059 3970648
[email protected]
www.agmetrology.it, www.agmetrology.com
Accreditation # 108949
FINAL REPORT N° AG_2024_R_0014 EN
5. ORGANISATION
This interlaboratory comparison was organized by AG Metrology S.r.l.
AG Metrology S.r.l. is an Italian PTP accredited in accordance with the requirements of the ISO/IEC-17043:2010 by PJLA, signatory of the
ILAC MRA mutual recognition agreements, with accreditation n° 108949 and certificate n° L22-398.
6. PARTICIPANTS
Participants list, contact information and events calendar are shown in the attached document 'PT2023_017 - 17043T_02_EX
Partecipanti - participants Annex A rev.02'.
The comparison was performed according to the expected schedule.
7. PROFICIENCY TESTING SCHEME
A Sequential scheme was adopted for the comparison.
8. TRAVELLING STANDARD
A Hart Scientific 5628 sn. 0501 Standard platinum resistance thermometer was used as travelling standard.
9. QUANTITY TO BE MEASURED
The error from the nominal value.
10. MEASUREMENT INSTRUCTIONS
The measurement instructions and those for traveling sample transporting and storing are given in the attached document 'Istruzioni
tecniche - technical instructions 17043T_02_EX ' and were provided to the Participants via e-mail.
Report FInale Pagina 3 di 23
PT2023_017 - 17043T_02_EX Final Report Page 3 of 23
AG Metrology S.r.l.
Strada San Faustino, 155/N
41124 Modena Italy
Tel. +39 059 3970648
[email protected]
www.agmetrology.it, www.agmetrology.com
Accreditation # 108949
FINAL REPORT N° AG_2024_R_0014 EN
11. FEEDBACK CONTROL OF THE MEASUREMENT RESULTS
After completion of the measurements of all ILC participants and of the reference laboratory the pre-evaluation of the measurement
results was performed consisting in En-numbers calculation at each measurement point.
Consequently, each ILC participant received a table with its measured values and stated uncertainties, taken from its calibration
certificate and used for such pre-evaluation, for the purposes of a feedback control.
If a participant has detected any disagreement (any spelling mistakes in its calibration certificate, any incorrectly entered values to the
table, etc.) he was supposed to respond by 5 working days from riceivement of the mail and to deliver new corrected documents with, in
case of measurement values, an evidence that it was really just a mistake (a copy of the corresponding measurement record).
If a participant had not responded by a given date the original measurement values were used for the final evaluation and are presented
in this Report.
12. CORRECTIVE ACTIONS ADOPTED
No corrective actions have been adopted.
Report FInale Pagina 4 di 23
PT2023_017 - 17043T_02_EX Final Report Page 4 of 23
AG Metrology S.r.l.
Strada San Faustino, 155/N
41124 Modena Italy
Tel. +39 059 3970648
[email protected]
www.agmetrology.it, www.agmetrology.com
Accreditation # 108949
FINAL REPORT N° AG_2024_R_0014 EN
13. DETERMINATION OF REFERENCE VALUES
The reference values were calculated by AG Metrology as the average of the calibration results reported in the certificates
- LMK0321P187
- LMK0322P220
- LMK0323P238
- LMK0224P214
issued by LMK - UNIVERZA V LJUBLJANI, FAKULTETA ZA ELEKTROTEHNIKO by applying the following equation:
∑𝑛𝑛𝑖𝑖=1 𝑥𝑥𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟
𝑥𝑥𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟 =
𝑛𝑛
Where:
𝑥𝑥𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟 is the average reference value
𝑥𝑥𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟 is the result of the i calibration
𝑛𝑛 is number of calibration performed
The obtained results are approximated according to the indications reported in the documents [3], [4], [5].
14. STABILITY ASSESMENT
The decision was to evaluate the stability of the traveling standard for each single measurement point, according to the equation:
∑𝑛𝑛𝑖𝑖=1 𝑥𝑥𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟 − 𝑥𝑥𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟
𝑥𝑥𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟 =
𝑛𝑛
Where:
𝑢𝑢𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟 is the standard uncertainty of stability
𝑥𝑥𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟 is the result of the i calibration
𝑥𝑥𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟 is the average reference value
𝑛𝑛 is number of calibration performed
Report FInale Pagina 5 di 23
PT2023_017 - 17043T_02_EX Final Report Page 5 of 23
AG Metrology S.r.l.
Strada San Faustino, 155/N
41124 Modena Italy
Tel. +39 059 3970648
[email protected]
www.agmetrology.it, www.agmetrology.com
Accreditation # 108949
FINAL REPORT N° AG_2024_R_0014 EN
15. DETERMINATION OF MEASUREMENT UNCERTAINTY OF REFERENCE VALUES
The measurement uncertainty associated with the reference values is calculated as the maximum uncertainty value detected
according to equation:
𝑈𝑈𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟 = 𝑀𝑀𝑀𝑀𝑀𝑀 𝑈𝑈𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟 ; 𝑈𝑈𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟
Where:
𝑈𝑈𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟 is the maximum extended uncertainty
𝑈𝑈𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟 is the extended uncertainty on initial calibration
𝑈𝑈𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟 is the extended uncertainty on final calibration
Then it was summed quadratically with the expanded stability uncertainty, applying the formula:
2 2
𝑈𝑈𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟 = 𝑈𝑈𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟 + 𝑈𝑈𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟
Where:
𝑈𝑈𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟 is the reference expanded uncertainty inclusive of the stability contribution
𝑈𝑈𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟 is the maximum extended uncertainty
𝑈𝑈𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟 is the extende uncertainty of stability
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Strada San Faustino, 155/N
41124 Modena Italy
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16. RESULTS OF INTERLABORATORY COMPARISON REFERENCE VALUES
TABLE A1: Reference values with associated uncertainties
NOMINAL VALUE ERROR EXPANDED UNCERTAINTY (K=2) EXPANDED UNCERTAINTY (K=2)
(Measured - Reference) UrefM UrefMS
-196.000 °C 0.110 °C 0.020 °C 0.026 °C
-80.000 °C 0.403 °C 0.008 °C 0.039 °C
-40.000 °C 0.495 °C 0.005 °C 0.025 °C
0.000 °C 0.585 °C 0.005 °C 0.010 °C
100.000 °C 0.838 °C 0.005 °C 0.023 °C
250.000 °C 1.231 °C 0.005 °C 0.035 °C
400.000 °C 1.633 °C 0.012 °C 0.056 °C
550.000 °C 2.043 °C 0.012 °C 0.091 °C
580.00 °C 2.13 °C 0.02 °C 0.10 °C
600.00 °C 2.18 °C 0.02 °C 0.11 °C
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17. EVALUATION CRITERIA
Participants were asked to report their measurements in an excel sheet prepared by AG Metrology S.r.l. or in a
calibration report / certificate.
Section 19 contains the overview of the results of the participants, including the errors and the associated extended
uncertainties.
Normalized error (En) was calculated to allow evaluation of the results.
The En number is calculated according to:
𝑥𝑥𝑙𝑙𝑙𝑙𝑙𝑙 − 𝑥𝑥𝑟𝑟𝑟𝑟𝑟𝑟𝑀𝑀
𝐸𝐸𝐸𝐸 =
2 2
𝑈𝑈𝑙𝑙𝑙𝑙𝑙𝑙 + 𝑈𝑈𝑟𝑟𝑟𝑟𝑟𝑟𝑀𝑀𝑀𝑀
Where:
𝑥𝑥𝑙𝑙𝑙𝑙𝑙𝑙 is the result (error) of participant laboratory
𝑥𝑥𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟 is the result (error) of refrence laboratory
𝑈𝑈𝑙𝑙𝑙𝑙𝑙𝑙 is the expanded uncertainty (k=2) given by participant laboratory
𝑈𝑈𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟 is the expanded uncertainty (k=2) given by refrence laboratory, including stability
Criteria for performance evaluation will be based on statistical determination for En number:
|En| ≤ 1 Satisfactory result
|En| > 1 Unsatisfactory result
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18. DETERMINATION OF CORRESPONDING TEMPERATURE VALUES OF PARTICIPANT LABORATORIES
UUT resistance values measured by participating laboratories were converted to temperature, according to indication reported on
document "Measurement Standard Laboratory of New Zealand Technical Guide 21 Using SPRT Calibration Certificates".
We used standard coefficients of reference function reported in table 1 of the document and 25.5 Ω as R(273.16 K) nominal one
provided by manufacturer of traveling standard.
For the measuring range from 13.8033 K to 273.15 K we used the function
1 𝑖𝑖
15
𝑊𝑊𝑟𝑟 𝑇𝑇90 6 − 0.65
𝑇𝑇90 𝑊𝑊𝑟𝑟 = 273.16 𝐵𝐵0 + � 𝐵𝐵𝑖𝑖
0.35
𝑖𝑖=1
For the measuring range from 0.01 °C to 961.78 °C we used the function
9 𝑖𝑖
𝑊𝑊𝑟𝑟 𝑇𝑇90 − 2.64
𝑇𝑇90 𝑊𝑊𝑟𝑟 = 273.15 + 𝐷𝐷0 + � 𝐷𝐷𝑖𝑖
1.64
𝑖𝑖=1
Below the calculated values, approximated according to the indications reported in the documents [3], [4], [5].
LAB01 LAB02
UUT RESISTANCE UUT CALCULATED UUT RESISTANCE UUT CALCULATED
READING TEMPERATURE READING TEMPERATURE
17.3341 Ω -79.27 °C 17.307 Ω -79.53 °C
21.4908 Ω -39.17 °C 21.475 Ω -39.33 °C
25.5592 Ω 0.60 °C 25.559 Ω 0.59 °C
35.6045 Ω 100.90 °C 35.656 Ω 101.42 °C
50.0869 Ω 251.22 °C 50.087 Ω 251.22 °C
63.9074 Ω 401.63 °C 63.874 Ω 401.26 °C
81.2817 Ω 602.17 °C 77.017 Ω 551.60 °C
LAB03 LAB04
UUT RESISTANCE UUT CALCULATED UUT RESISTANCE UUT CALCULATED
READING TEMPERATURE READING TEMPERATURE
4.7885 Ω -195.820 °C
17.3008 Ω -79.592 °C 17.3018 Ω -79.58 °C
21.4579 Ω -39.492 °C 21.4684 Ω -39.39 °C
25.5593 Ω 0.593 °C 25.5587 Ω 0.59 °C
35.5946 Ω 100.800 °C 35.5777 Ω 100.63 °C
50.0867 Ω 251.214 °C 50.0701 Ω 251.04 °C
63.857 Ω 401.07 °C 63.8968 Ω 401.51 °C
81.126 Ω 600.30 °C 79.5867 Ω 581.96 °C
LAB05 LAB06
UUT RESISTANCE UUT CALCULATED UUT RESISTANCE UUT CALCULATED
READING TEMPERATURE READING TEMPERATURE
17.3147 Ω -79.458 °C 17.2999 Ω -79.600 °C
21.4639 Ω -39.434 °C 21.4549 Ω -39.522 °C
25.5590 Ω 0.590 °C 25.5595 Ω 0.595 °C
35.6001 Ω 100.855 °C 35.6006 Ω 100.860 °C
50.0768 Ω 251.109 °C 50.0912 Ω 251.262 °C
63.9033 Ω 401.584 °C 63.9229 Ω 401.802 °C
81.2789 Ω 602.13 °C 81.2483 Ω 601.764 °C
Report FInale Pagina 9 di 23
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19. RESULTS OF INTERLABORATORY COMPARISON, PARTICIPANT LABS VALUES
the following tables show the results of the participants, approximated according to the indications reported in the
documents [3], [4], [5], together with the normalized errors (En). En values greater than 1 are displayed in red
characters.
TABLE A1A: LAB01 results
REFERENCE VALUE UUT READING ERROR EXPANDED UNCERTAINTY NORMALIZED
PARTICIPANT LAB PARTICIPANT LAB (K=2) ERROR
Ulab En
-79.68 °C 17.3341 Ω 0.41 °C 0.15 °C 0.05
-39.70 °C 21.4908 Ω 0.53 °C 0.15 °C 0.23
-0.01 °C 25.5592 Ω 0.61 °C 0.15 °C 0.17
100.02 °C 35.6045 Ω 0.88 °C 0.15 °C 0.28
249.94 °C 50.0869 Ω 1.28 °C 0.15 °C 0.32
399.92 °C 63.9074 Ω 1.71 °C 0.30 °C 0.25
599.89 °C 81.2817 Ω 2.28 °C 0.30 °C 0.31
GRAPHICAL PRESENTATION RESULTS LAB01
2.8
2.7
2.6
2.5
2.4
2.3
2.2
2.1
2.0
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
-100.00 -50.00 0.00 50.00 100.00 150.00 200.00 250.00 300.00 350.00 400.00 450.00 500.00 550.00 600.00 650.00
Reference error °C "LAB01 error °C
Report FInale Pagina 10 di 23
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Strada San Faustino, 155/N
41124 Modena Italy
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Accreditation # 108949
FINAL REPORT N° AG_2024_R_0014 EN
the following tables show the results of the participants, approximated according to the indications reported in the
documents [3], [4], [5], together with the normalized errors (En). En values greater than 1 are displayed in red
characters.
TABLE A1B: LAB02 results
REFERENCE VALUE UUT READING ERROR EXPANDED UNCERTAINTY NORMALIZED
PARTICIPANT LAB PARTICIPANT LAB (K=2) ERROR
Ulab En
-79.92 °C 17.307 Ω 0.39 °C 0.06 °C -0.18
-39.82 °C 21.475 Ω 0.49 °C 0.06 °C -0.08
0.00 °C 25.559 Ω 0.59 °C 0.06 °C 0.08
100.59 °C 35.656 Ω 0.83 °C 0.05 °C -0.15
250.01 °C 50.087 Ω 1.21 °C 0.11 °C -0.18
399.63 °C 63.874 Ω 1.63 °C 0.11 °C -0.02
549.55 °C 77.017 Ω 2.05 °C 0.11 °C 0.05
GRAPHICAL PRESENTATION RESULTS LAB02
2.2
2.1
2.0
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
-100.00 -50.00 0.00 50.00 100.00 150.00 200.00 250.00 300.00 350.00 400.00 450.00 500.00 550.00 600.00
Reference error °C "LAB02 error °C
Report FInale Pagina 11 di 23
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AG Metrology S.r.l.
Strada San Faustino, 155/N
41124 Modena Italy
Tel. +39 059 3970648
[email protected]
www.agmetrology.it, www.agmetrology.com
Accreditation # 108949
FINAL REPORT N° AG_2024_R_0014 EN
the following tables show the results of the participants, approximated according to the indications reported in the
documents [3], [4], [5], together with the normalized errors (En). En values greater than 1 are displayed in red
characters.
TABLE A1C: LAB03 results
REFERENCE VALUE UUT READING ERROR EXPANDED UNCERTAINTY NORMALIZED
PARTICIPANT LAB PARTICIPANT LAB (K=2) ERROR
Ulab En
-195.921 °C 4.7885 Ω 0.101 °C 0.080 °C -0.11
-79.980 °C 17.3008 Ω 0.388 °C 0.040 °C -0.27
-39.979 °C 21.4579 Ω 0.487 °C 0.020 °C -0.25
0.010 °C 25.5593 Ω 0.583 °C 0.020 °C -0.09
99.968 °C 35.5946 Ω 0.832 °C 0.020 °C -0.20
249.993 °C 50.0867 Ω 1.221 °C 0.040 °C -0.19
399.47 °C 63.857 Ω 1.60 °C 0.66 °C -0.05
598.02 °C 81.126 Ω 2.28 °C 0.93 °C 0.11
GRAPHICAL PRESENTATION RESULTS LAB03
3.4
3.2
3.0
2.8
2.6
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
-200.0 -150.0 -100.0 -50.0 0.0 50.0 100.0 150.0 200.0 250.0 300.0 350.0 400.0 450.0 500.0 550.0 600.0 650.0
Reference error °C "LAB03 error °C
Report FInale Pagina 12 di 23
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AG Metrology S.r.l.
Strada San Faustino, 155/N
41124 Modena Italy
Tel. +39 059 3970648
[email protected]
www.agmetrology.it, www.agmetrology.com
Accreditation # 108949
FINAL REPORT N° AG_2024_R_0014 EN
the following tables show the results of the participants, approximated according to the indications reported in the
documents [3], [4], [5], together with the normalized errors (En). En values greater than 1 are displayed in red
characters.
TABLE A1D: LAB04 results
REFERENCE VALUE UUT READING ERROR EXPANDED UNCERTAINTY NORMALIZED
PARTICIPANT LAB PARTICIPANT LAB (K=2) ERROR
Ulab En
-79.97 °C 17.3018 Ω 0.39 °C 0.06 °C -0.18
-39.91 °C 21.4684 Ω 0.52 °C 0.06 °C 0.38
0.00 °C 25.5587 Ω 0.59 °C 0.05 °C 0.10
99.82 °C 35.5777 Ω 0.81 °C 0.05 °C -0.51
249.82 °C 50.0701 Ω 1.22 °C 0.05 °C -0.18
399.84 °C 63.8968 Ω 1.67 °C 0.10 °C 0.32
579.81 °C 79.5867 Ω 2.15 °C 0.10 °C 0.14
GRAPHICAL PRESENTATION RESULTS LAB04
2.4
2.3
2.2
2.1
2.0
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
-100.00 -50.00 0.00 50.00 100.00 150.00 200.00 250.00 300.00 350.00 400.00 450.00 500.00 550.00 600.00
Reference error °C "LAB04 error °C
Report FInale Pagina 13 di 23
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AG Metrology S.r.l.
Strada San Faustino, 155/N
41124 Modena Italy
Tel. +39 059 3970648
[email protected]
www.agmetrology.it, www.agmetrology.com
Accreditation # 108949
FINAL REPORT N° AG_2024_R_0014 EN
the following tables show the results of the participants, approximated according to the indications reported in the
documents [3], [4], [5], together with the normalized errors (En). En values greater than 1 are displayed in red
characters.
TABLE A1E: LAB05 results
REFERENCE VALUE UUT READING ERROR EXPANDED UNCERTAINTY NORMALIZED
PARTICIPANT LAB PARTICIPANT LAB (K=2) ERROR
Ulab En
-79.837 °C 17.3147 Ω 0.379 °C 0.031 °C -0.48
-39.917 °C 21.4639 Ω 0.483 °C 0.031 °C -0.30
0.007 °C 25.5590 Ω 0.583 °C 0.013 °C -0.13
100.025 °C 35.6001 Ω 0.830 °C 0.042 °C -0.17
249.900 °C 50.0768 Ω 1.209 °C 0.042 °C -0.41
399.988 °C 63.9033 Ω 1.596 °C 0.095 °C -0.34
599.96 °C 81.2789 Ω 2.17 °C 0.15 °C -0.08
GRAPHICAL PRESENTATION RESULTS LAB05
2.5
2.4
2.3
2.2
2.1
2.0
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
-100.00 -50.00 0.00 50.00 100.00 150.00 200.00 250.00 300.00 350.00 400.00 450.00 500.00 550.00 600.00 650.00
Reference error °C "LAB05 error °C
Report FInale Pagina 14 di 23
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AG Metrology S.r.l.
Strada San Faustino, 155/N
41124 Modena Italy
Tel. +39 059 3970648
[email protected]
www.agmetrology.it, www.agmetrology.com
Accreditation # 108949
FINAL REPORT N° AG_2024_R_0014 EN
the following tables show the results of the participants, approximated according to the indications reported in the
documents [3], [4], [5], together with the normalized errors (En). En values greater than 1 are displayed in red
characters.
TABLE A1F: LAB06 results
REFERENCE VALUE UUT READING ERROR EXPANDED UNCERTAINTY NORMALIZED
PARTICIPANT LAB PARTICIPANT LAB (K=2) ERROR
Ulab En
-79.984 °C 17.2999 Ω 0.384 °C 0.005 °C -0.48
-40.002 °C 21.4549 Ω 0.480 °C 0.004 °C -0.59
0.010 °C 25.5595 Ω 0.585 °C 0.006 °C 0.00
100.032 °C 35.6006 Ω 0.828 °C 0.007 °C -0.42
250.052 °C 50.0912 Ω 1.210 °C 0.008 °C -0.58
400.169 °C 63.9229 Ω 1.633 °C 0.010 °C 0.00
599.836 °C 81.2483 Ω 1.928 °C 0.010 °C -2.3
GRAPHICAL PRESENTATION RESULTS LAB06
2.4
2.3
2.2
2.1
2.0
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
-100.00 -50.00 0.00 50.00 100.00 150.00 200.00 250.00 300.00 350.00 400.00 450.00 500.00 550.00 600.00 650.00
Reference error °C "LAB06 error °C
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20. GRAPHICAL PRESENTATION OF ERRORS
The following graph provide a quick overview of the errors (xLab) in comparison with the other participants for kind of
measurements.
GRAPHICAL PRESENTATION OF ERRORS
2.4
2.3
2.2
2.1
2.0
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
-200.0 -150.0 -100.0 -50.0 0.0 50.0 100.0 150.0 200.0 250.0 300.0 350.0 400.0 450.0 500.0 550.0 600.0 650.0
Reference LAB01 LAB02 LAB03 LAB04 LAB05 LAB06
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21. GRAPHICAL PRESENTATION OF THE NORMALIZED ERROR
GRAPHICAL PRESENTATION NORMALIZED ERROR LAB01
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0.60
0.55
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
-0.05 -80 -40 0 100 250 400 600
-0.10
-0.15
-0.20
-0.25
-0.30
-0.35
-0.40
-0.45
-0.50
-0.55
-0.60
-0.65
-0.70
-0.75
-0.80
-0.85
-0.90
-0.95
-1.00
Report Finale Pagina 17 di 23
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GRAPHICAL PRESENTATION NORMALIZED ERROR LAB02
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0.60
0.55
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
-0.05 -80 -40 0 101 250 400 550
-0.10
-0.15
-0.20
-0.25
-0.30
-0.35
-0.40
-0.45
-0.50
-0.55
-0.60
-0.65
-0.70
-0.75
-0.80
-0.85
-0.90
-0.95
-1.00
Report Finale Pagina 18 di 23
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Strada San Faustino, 155/N
41124 Modena Italy
Tel. +39 059 3970648
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Accreditation # 108949
FINAL REPORT N° AG_2024_R_0014 EN
GRAPHICAL PRESENTATION NORMALIZED ERROR LAB03
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0.60
0.55
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
-0.05 -196 -80 -40 0 100 250 399 598
-0.10
-0.15
-0.20
-0.25
-0.30
-0.35
-0.40
-0.45
-0.50
-0.55
-0.60
-0.65
-0.70
-0.75
-0.80
-0.85
-0.90
-0.95
-1.00
Report Finale Pagina 19 di 23
PT2023_017 - 17043T_02_EX Final Report Page 19 of 23
AG Metrology S.r.l.
Strada San Faustino, 155/N
41124 Modena Italy
Tel. +39 059 3970648
[email protected]
www.agmetrology.it, www.agmetrology.com
Accreditation # 108949
FINAL REPORT N° AG_2024_R_0014 EN
GRAPHICAL PRESENTATION NORMALIZED ERROR LAB04
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0.60
0.55
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
-0.05 -80 -40 0 100 250 400 580
-0.10
-0.15
-0.20
-0.25
-0.30
-0.35
-0.40
-0.45
-0.50
-0.55
-0.60
-0.65
-0.70
-0.75
-0.80
-0.85
-0.90
-0.95
-1.00
Report Finale Pagina 20 di 23
PT2023_017 - 17043T_02_EX Final Report Page 20 of 23
AG Metrology S.r.l.
Strada San Faustino, 155/N
41124 Modena Italy
Tel. +39 059 3970648
[email protected]
www.agmetrology.it, www.agmetrology.com
Accreditation # 108949
FINAL REPORT N° AG_2024_R_0014 EN
GRAPHICAL PRESENTATION NORMALIZED ERROR LAB05
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0.60
0.55
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
-0.05 -80 -40 0 100 250 400 600
-0.10
-0.15
-0.20
-0.25
-0.30
-0.35
-0.40
-0.45
-0.50
-0.55
-0.60 FINAL REPORT N° AG_2024_R_0014
-0.65
-0.70
-0.75
-0.80
The following graph provide a graphical overview of the results by participant.
-0.85
-0.90
-0.95
-1.00
Report Finale Pagina 21 di 23
PT2023_017 - 17043T_02_EX Final Report Page 21 of 23
AG Metrology S.r.l.
Strada San Faustino, 155/N
41124 Modena Italy
Tel. +39 059 3970648
[email protected]
www.agmetrology.it, www.agmetrology.com
Accreditation # 108949
FINAL REPORT N° AG_2024_R_0014 EN
GRAPHICAL PRESENTATION NORMALIZED ERROR LAB06
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
-80 -40 0 100 250 400 600
-0.1
-0.2
-0.3
-0.4
-0.5
-0.6
-0.7
-0.8
-0.9
-1.0
-1.1
-1.2
-1.3
-1.4
-1.5
-1.6
-1.7
-1.8
-1.9
-2.0
-2.1
-2.2
-2.3
-2.4
-2.5
Report Finale Pagina 22 di 23
PT2023_017 - 17043T_02_EX Final Report Page 22 of 23
AG Metrology S.r.l.
Strada San Faustino, 155/N
41124 Modena Italy
Tel. +39 059 3970648
[email protected]
www.agmetrology.it, www.agmetrology.com
Accreditation # 108949
FINAL REPORT N° AG_2024_R_0014 EN
22. COMMENTS AND CONCLUSIONS
The PT2023_017 - 17043T_02_EX comparison was performed with 6 participating laboratories.
1 of 6 laboratories having one or more unsatisfactory results.
23. DISCUSSION, COMPLAINS AND APPEAL ON THE RESULTS
There is an opportunity for each participant to discuss its own results after presenting the Preliminary Report.
The participant has the opportunity to file a complaint during the PT activities or to make an appeal after the final report is issued by
leaving your contact details at
[email protected]
24. REFERECES
[1] "ISO/IEC 17025:2017 General requirements for the competence of testing and calibration laboratories"
[2] "ISO/IEC 17043:2010 Conformity assessment — General requirements for proficiency testing"
[3] "JCGM 100:2008 GUM 1995 with minor corrections
Evaluation of measurement data — Guide to the expression of uncertainty in measurement"
[4] "DKD-L 13-3 Rounding of Results and Measurement Uncertainties in Calibration Certificates"
[5] "NIST GLP 9 Good Laboratory Practice for Rounding Expanded Uncertainties and Calibration Values"
[6] "ISO 13528:2022 Statistical methods for use in proficiency testing by interlaboratory comparison"
[7] "Measurement Standard Laboratory of New Zealand Technical Guide 21 Using SPRT Calibration Certificates"
[8] Istruzioni tecniche - technical instructions 17043T_02_EX
[9] PT2023_017 - 17043T_02_EX Partecipanti - participants Annex A rev.02
25. AMENDMENT RECORD
Rev. Subject of change Data Redatto da
00 First issue 17/05/2024 G. Calzolari
Report FInale Pagina 23 di 23
PT2023_017 - 17043T_02_EX Final Report Page 23 of 23
AG Metrology S.r.l.
Strada San Faustino, 155/N
41124 Modena Italy
Tel. +39 059 3970648
[email protected]
www.agmetrology.it, www.agmetrology.com
Accreditation # 108949
Istruzioni al partecipante del Proficiency Measuring instructions for participant of Proficiency
Testing Testing
PT2023_017 - 17043T_02_EX
Oggetto del confronto interlaboratorio Proficiency testing object
Termometro a resistenza di platino industriale Industrial platinum resistance thermometer
Campione viaggiante Traveler measurement sample
'Hart Scientific 5628 sn. 0501 '''Hart Scientific 5628 sn. 0501
Laboratorio di riferimento Reference laboratory
LMK - UNIVERZA V LJUBLJANI, FAKULTETA ZA ELEKTROTEHNIKO
Tržaška cesta 25
SI-1000 Ljubljana - Slovenija
Certificate of accreditation n° LK-002 Slovenska Akreditacija ILAC MRA Signatory
Coordinatore Coordinator
Responsabile del confronto e segreteria tecnica: Contact person :
dr.ssa Giorgia Calzolari
email :
[email protected]
Tel +39 335 7054933
Referente tecnico: Contact persons in case of technical questions:
Andrea Meda
email :
[email protected]
Tel +39 340 4917966
Introduzione Introduction
Lo scopo della prova valutativa è il confronto dei risultati dei laboratori The purpose of the proficiency test is to compare the results of the
partecipanti alla taratura di un Termometro a resistenza di platino participating laboratories during calibration for measurements on a
industriale. Si raccomanda ai partecipanti di utilizzare la proprima Industrial platinum resistance thermometer. It is recommended that the
procedura standard durante la taratura e, se possibile, di evitare participants use their standard procedure during the calibration and if
misurazioni extra. Lo strumento deve essere utilizzato dal laboratorio possible, avoid making extra time-consuming measurements.The
partecipante esclusivamente per eseguire questo protocollo, ogni altro instrument must also be used by the participating Laboratory
utilizzo è assolutamente vietato. exclusively to carry out the calibration protocol present within this
document. Any other use is absolutely prohibited.
Istruzioni al partecipante
Pagina 1 di 6 Instructions for participant Page 1 of 6
AG Metrology S.r.l.
Strada San Faustino, 155/N
41124 Modena Italy
Tel. +39 059 3970648
[email protected]
www.agmetrology.it, www.agmetrology.com
Accreditation # 108949
Istruzioni al partecipante del Proficiency Measuring instructions for participant of Proficiency
Testing Testing
PT2023_017 - 17043T_02_EX
Partecipanti e pianificazione Participants and planning
Per la lista dei partecipanti ed il calendario di partecipazione fare For participants list and calendar participation , refer to attachment A
riferimento all'allegato A "PT2023_017 - 17043T_02_EX Pianificazione - "PT2023_017 - 17043T_02_EX Pianificazione - Planning"
Planning"
Se il partecipante prevede difficoltà nel rispettare le scadenze, il If the participant anticipates difficulties in keeping the deadlines, the
coordinatore deve essere contattato immediatamente. Il termine per la coordinator must be contacted immediately.
comunicazione dei risultati è di 5 giorni dopo che l'apparecchiatura ha Deadline for reporting the results is 5 days after the equipment has left
lasciato il laboratorio. In caso di problemi o dubbi sui risultati del the laboratory. If there are any problems or doubt regarding the results
laboratorio partecipante, il laboratorio verrà immediatamente of the participant laboratory, the laboratory will be contacted
contattato. Qualsiasi sospetto che l'attrezzatura sia difettosa o derivata, immediately. Any suspicion that the equipment is defect or drifted, will
porterà alla restituzione dell'attrezzatura al laboratorio di riferimento, lead to return of the equipment to the reference laboratory, which then
che quindi effettuerà un ulteriore controllo e intraprenderà le azioni will make an extra check and take an appropriate action.
appropriate.
Trasporto dell'attrezzatura Transport of equipment
Lo strumento per il confronto viaggerà riposto in una scatola di The equipment for comparison will travel stored in transportation box
trasporto e all'interno di una custodia protettiva adeguatamente and inside a protective case suitably covered with shockproof
rivestita con materiale di imballaggio antiurto. Il laboratorio packaging material. The participating laboratory will have to return the
partecipante dovrà restituire lo strumento dopo aver riconfezionato instrument after having faithfully repacked the original packaging
fedelmente l'imballo originale (condizioni di arrivo). Non appena il (arrival conditions). As soon as the participating laboratory receives the
laboratorio partecipante riceve l'attrezzatura, il coordinatore deve equipment the coordinator shall be informed (e.g. by e-mail). The
essere informato (ad esempio tramite e-mail). Il Laboratorio deve aprire equipment is then unpacked, and an inspection carried out. If the
l’imballo ed ispezionare l’attrezzatura: se l'apparecchiatura presenta equipment has any visible damage due to transportation, this must be
danni visibili dovuti al trasporto, è necessario segnalarlo al coordinatore reported to the coordinator before the calibration begins. Each
prima dell'inizio della taratura. Ogni laboratorio partecipante provvede participating laboratory arranges to organize at its own expense and
ad organizzare a proprie spese e cura il trasporto al laboratorio take care of the transport to the next laboratory according to the
successivo secondo lo schema riportato al paragrafo "Partecipanti e scheme reported in the paragraph "Participants and Planning".
Pianificazione".
Istruzioni al partecipante
Pagina 2 di 6 Instructions for participant Page 2 of 6
AG Metrology S.r.l.
Strada San Faustino, 155/N
41124 Modena Italy
Tel. +39 059 3970648
[email protected]
www.agmetrology.it, www.agmetrology.com
Accreditation # 108949
Istruzioni al partecipante del Proficiency Measuring instructions for participant of Proficiency
Testing Testing
PT2023_017 - 17043T_02_EX
Descrizione della strumentazione Description of equipment
Il Laboratorio riceverà il seguente strumento: 'Hart Scientific 5628 sn. The laboratory will receive the following equipment: 'Hart Scientific
0501. 5628 sn. 0501.
Condizioni ambientali Environmental conditions
La taratura viene eseguita a temperatura e umidità relativa in Calibration is carried out at an ambient temperature and relative
conformità con le procedure di taratura del laboratorio partecipante e humidity in accordance with the calibration procedures of the
devono essere riportate. Se applicabile, prima di eseguire la taratura, lo participating laboratory, and they shall be reported.
strumento deve essere posto in equilibrio termoigrometrico con If applicable before performing the calibration, the instrument must be
l'ambiente secondo le procedure di taratura del laboratorio placed in a thermo-hygrometric equilibrium with the environment in
partecipante. accordance with the calibration procedures of the participating
laboratory
Istruzioni al partecipante
Pagina 3 di 6 Instructions for participant Page 3 of 6
AG Metrology S.r.l.
Strada San Faustino, 155/N
41124 Modena Italy
Tel. +39 059 3970648
[email protected]
www.agmetrology.it, www.agmetrology.com
Accreditation # 108949
Istruzioni al partecipante del Proficiency Measuring instructions for participant of Proficiency
Testing Testing
PT2023_017 - 17043T_02_EX
Imballaggio e disimballaggio Packing and unpacking
La procedura per il disimballaggio è la seguente: Procedure for unpacking is as follows:
1) Ispezionare la scatola di trasporto per rilevare eventuali 1) Inspect the transportation box for damage. If the box is
danni. Se la scatola è danneggiata, contattare il damaged, the coordinator shall be contacted before
coordinatore prima di continuare continuing
2) Disimballare l'apparecchiatura e verificare che tutte le 2) Unpack the equipment and check that all equipment
apparecchiature menzionate nella sezione "Descrizione mentioned in the section “Description of equipment” is
dell'apparecchiatura" siano presenti present
3) Nel caso mancasse qualche componente dell'attrezzatura, 3) If any equipment is missing, the coordinator or the
contattare il coordinatore participant shall be contacted.
4) Ispezionare l'apparecchiatura. Se una qualsiasi delle 4) Inspect the equipment. If any of the equipment shows
attrezzature mostra segni visibili di danneggiamento, visible signs of damage, the coordinator or the participant
contattare il coordinatore shall be contacted
La procedura di imballaggio è la seguente: The packing procedure is as follows:
1) Posizionare l'apparecchiatura nella scatola di trasporto 1) Place the equipment in the transportation box
2) Verificare che tutta l'attrezzatura menzionata nella 2) Check that all equipment mentioned in the section
sezione "Descrizione dell'attrezzatura" sia imballata prima “Description of equipment” is packed before the
del trasporto dell'attrezzatura equipment is transported
Preparazione e configurazione UUT UUT preparation and configuration
Consentire allo strumento di equilibrarsi nell’ambiente secondo le Instrument stabilization (warm-up) before measurements should have
procedure previste dal Laboratorio, ma per almeno 2 ore. Ciò è been made according to the common laboratory practice, but at least
particolarmente necessario dopo il trasporto. Seguire attentamente le for 2 hours in the laboratory environment. Follow the manufacturer's
istruzioni contenute nel manuale d’uso allegato. Evitare vibrazioni o urti care instructions for the instrument. Avoid vibration and mechanical
alla sonda. Quando lo strumento non è utilizzato conservarlo in un shock. When not in use, it should be stored in a safe place in the
luogo sicuro nella sua scatola. In caso di dubbi consultare il manuale o provided transport boxes. Refer to the manual or contact the
chiamare il coordinatore. coordinator in a case of doubt about the above-mentioned precautions.
Istruzioni al partecipante
Pagina 4 di 6 Instructions for participant Page 4 of 6
AG Metrology S.r.l.
Strada San Faustino, 155/N
41124 Modena Italy
Tel. +39 059 3970648
[email protected]
www.agmetrology.it, www.agmetrology.com
Accreditation # 108949
Istruzioni al partecipante del Proficiency Measuring instructions for participant of Proficiency
Testing Testing
PT2023_017 - 17043T_02_EX
Preparazione e configurazione UUT UUT preparation and configuration
Posizionare con cura il termometro nel mezzo di comparatore (bagno, Probe is carefully placed in the calibration media (bath, dry block,
blocco a secco, camera climatica). Evitare vibrazioni o urti alla sonda. climatic chamber). Avoid vibration and mechanical shock. When not in
Quando la sonda non è utilizzata conservarla in un luogo sicuro nella sua use, it should be stored in a safe place in the provided transport boxes.
scatola. Verificare che la sonda sia pulita e asciutta prima di inserirla nei Check that the probe are completely clean and dry before placing them
mezzi comparatori. Assicurarsi che la sonda sia pulita e fredda prima di in the calibration media. Ensure that the probe are cooled down and
inserirla nella sua custodia. In caso di dubbi consultare il coordinatore cleaned with alcohol, if necessary, before placing them in the
transportation box. Refer to the the coordinator in a case of doubt
about the above-mentioned precautions.
Taratura Calibration
Si consiglia al partecipante di utilizzare la procedura accreditata durante It is recommended that the participant uses their standard procedure
la taratura ed evitare di effettuare misurazioni che richiedono tempo during calibration and avoid making extra time-consuming
extra, se possibile. I dettagli sulla procedura applicata possono essere measurements, if possible. Details about the applied procedure can be
indicati nel modulo di raccolta dati. stated in the report form.
I partecipanti non devono eseguire alcun trattamento termico The participants will not perform any heat treatment to the
(annealing) alla termocoppia. Per mantenere una maggiore stabilità thermocouples. To maintain their thermoelectric stability, they have to
deve essere tenuta il minor tempo possibile ad elevate temperature. be exposed as short as possible to high temperatures.
L’incertezza estesa associata a ciascuna misurazione deve includere tutti The extended uncertainty associated with each measurement must
i contributi associati allo strumento in prova, valutati secondo le include all the contributions associated with the instrument under test,
modalità operative approvate dal laboratorio partecipante. evaluated according to the operating procedures approved by the
participating laboratory.
Punti di misura Masuring points
L’UUT è da tarare ai seguenti punti, in accordo alle proprie procedure The equipment is calibrated in the following points, according to each
interne: internal procedures:
(-196, -80, -40, 0, 100, 250, 400, 600) °C
Report dei risultati Reporting of results
I risultati sono da riportare elettronicamente compilando il The results are reported electronically in the forwarded Excel
foglio di calcolo Excel inoltrato nei campi disponibili. I spreadsheet. In the report form, the participants are also asked to fill in
partecipanti sono anche invitati a compilare i dettagli sul details about the applied method, equipment and traceability, if this
metodo applicato, le attrezzature e la riferibilità, se queste information does not appear from an issued calibration certificate. The
informazioni non risultano da un certificato di taratura laboratories which normally issue calibration certificates (e.g. the
emesso. I laboratori che normalmente rilasciano certificati accredited laboratories), should send a standard certificate to the
di taratura (ad esempio i laboratori accreditati), devono coordinator. The results shall be sent to the coordinator no later than 5
inviare un certificato standard al coordinatore. I risultati days after having finalized the calibration. Electronic reporting by e-
devono essere inviati al coordinatore entro e non oltre 5 mail is preferred.
giorni dopo aver terminato la taratura, tramite e-mail.
Istruzioni al partecipante
Pagina 5 di 6 Instructions for participant Page 5 of 6
AG Metrology S.r.l.
Strada San Faustino, 155/N
41124 Modena Italy
Tel. +39 059 3970648
[email protected]
www.agmetrology.it, www.agmetrology.com
Accreditation # 108949
Istruzioni al partecipante del Proficiency Measuring instructions for participant of Proficiency
Testing Testing
PT2023_017 - 17043T_02_EX
Informazioni da restituire ai partecipanti Informations to be returned to participants
I partecipanti riceveranno un riepilogo di tutte le The participants will receive summary of all
misurazioni, i valori assegnati, le incertezze dei valori measurements, assigned values and uncertainties of
assegnati e la valutazione delle prestazioni. La valutazione assigned values, and evaluation of the performance. The
dei risultati delle misurazioni sarà effettuata sulla base del evaluation of measurement results will be made on the
numero En: basis of En number:
𝑥 𝑥
𝐸𝑛
𝑈 𝑈
dove where
il risultato del partecipante è 𝑥 is the participant’s result
il valore assegnato è 𝑥 is the assigned value
l'incertezza estesa (k=2) del risultato del partecipante è is the expanded (k=2) uncertainty of a participant’s result
𝑈
l'incertezza estesa (k=2) del valore assegnato dal is the expanded (k=2) uncertainty of the reference
laboratorio di riferimento è
𝑈 laboratory’s assigned value
I criteri per la valutazione delle prestazioni sono basati Criteria for performance evaluation will be based on
sulla determinazione statistica per il numero En: statistical determination for En number:
soddisfacente 𝐸𝑛 1 satisfactory
insoddisfacente 𝐸𝑛 1 unsatisfactory
Revisione Amendment Record
Rev. Motivo della modifica Data Compilato da Rev. Subject of change Date Compiled by
00 Prima emissione 07/10/2023 G. Calzolari 00 first issue 07/10/2023 G. Calzolari
Istruzioni al partecipante
Pagina 6 di 6 Instructions for participant Page 6 of 6
17043T_02_EX: dati del confronto interlaboratorio su un termometro a resistenza Hart
Scientific 5628
17043T_02_EX: Results for intercomparison for measurements on a resistance thermometer
Hart Scientific 5628
Nome del Laboratorio:
Name of Laboratory:
Data esecuzione misure UUT
UUT date of measurements
Descrizione dell'attrezzatura utilizzata - Description of equipment used
Dettagli relativi alle procedure di taratura utilizzate -Details concerning used calibration procedure
Campioni di riferimento (intervallo) - Reference
Catena di riferibilità - Traceability
standards (range)
Attrezzatura di riferimento (intervallo) - Auxiliary
Catena di riferibilità - Traceability
measurement equipment (range)
17043T_02_EX: dati del confronto interlaboratorio su un termometro a resistenza Hart Scientific 5628
17043T_02_EX: Results for intercomparison for measurements on a resistance thermometer Hart Scientific 5628
Valore nominale Resistenza media resistenza media Temperatura di Temperatura Error = temperature uut - Incertezza estesa di Capacità di
del riferimento sperimentale UUT riferimento calcolata UUT reference temperature taratura taratura e misura
calcolata (CMC)
Reference Calibration and
Calculated Error = temperature uut - Expanded uncertainty
Set value Reference resistance UUT resistance calculated measurement
temperature UUT reference temperature of calibration
temperature capability (CMC)
°C Ω Ω °C °C °C °C
Verifica stabilità 0 °C iniziale
0
0 °C initial stability check
-196
-80
-40
0
100
250
400
600
Verifica stabilità 0 °C finale
0
0 °C Final stability check
Indicare la norma di riferimento utilizzata per la conversione resistemza - temperatura / temperatura - resistenza
Indicate the reference standard used for conversion resistance - temperature / temperature - resistance
Temperatura Ambiente (ambient temperature): °C
Umidità relativa (Ambient relative humidity): RH
AG Metrology S.r.l.
Strada San Faustino, 155/N
41124 Modena Italy
Tel. +39 059 3970648
[email protected]
www.agmetrology.it, www.agmetrology.com
Accreditation # 108949
Istruzioni al partecipante del Proficiency Testing - Measuring instructions for participant of Proficiency
Allegato A Testing - Annex A
PT2023_017 - 17043T_02_EX
Partecipanti e pianificazione Participants and planning
Indirizzo di spedizione T.E.S.I. S.r.l. Shipping address
Zona Ind.le Castelnuovo, 242/b
52010 Subbiano (AR), Italy
Referente e recapiti Marco Porpora contact person and contact
[email protected] details
+39 348 7273923
Data ricevimento 16/10/2023 date of receipt
Data spedizione 20/10/2023 shipping date
Indirizzo di spedizione ARC Brasov Shipping address
Strada Fantanii, 17
500482 Brasov, Romania
Referente e recapiti Dragos Rotaru contact person and contact
[email protected] details
00731025893
Data ricevimento 30/10/2023 date of receipt
Data spedizione 08/11/2023 shipping date
Indirizzo di spedizione AS Metrosert Shipping address
Teaduspargi 8
12618 Tallinn, Estonia
Referente e recapiti Indrek Odrats contact person and contact
[email protected] details
+37256477492
Data ricevimento 27/11/2023 date of receipt
Data spedizione 01/12/2023 shipping date
Indirizzo di spedizione Galdabini Cesare S.p.A. Shipping address
Via Giovanni XXIII, 183
21010 Cardano al Campo (VA), Italia
Referente e recapiti Stefano Porzio contact person and contact
[email protected] details
(+39) 0331 732757
Data ricevimento 11/12/2023 date of receipt
Data spedizione 15/12/2023 shipping date
Indirizzo di spedizione AG Metrology S.r.l. Shipping address
Strada San Faustino, 155/N
41124 Modena, Italy
Indirizzo di spedizione SET Y GAD S.A.S. Shipping address
Carrera 48 # 101 A - 69
111111 Bogotá D.C., Colombia
Referente e recapiti Felipe Uribe contact person and contact
[email protected] details
+57 320 3048352
Data ricevimento 02/01/2023 date of receipt
09/01/2023
Indirizzo di spedizione AG Metrology S.r.l. Shipping address
Strada San Faustino, 155/N
41124 Modena, Italy
Referente e recapiti Andrea Meda contact person and contact
[email protected] details
+39 059 3970648
Data ricevimento 18/01/2024 date of receipt
24/01/2024
Allegato A
Pagina 1 di 1 Annex A Page 1 of 1
Temperatuuri riigietaloni mõõte- ja abivahendeid ning etalone
iseloomustavate metroloogiliste parameetrite, laboriruumi ja personali
kirjeldus
Sisukord
1. Sissejuhatus ........................................................................................................................2
2. Mõisted ...............................................................................................................................2
3. Mõõte- ja abivahendid .........................................................................................................3
4. Jälgitavusahel ......................................................................................................................4
5. Mõõtevõime ........................................................................................................................4
6. Etaloni metroloogilisi omadusi tõendavad dokumendid ........................................................4
7. Temperatuuri riigietaloni laboriruum ....................................................................................5
8. Riigietaloni säilitamisega ja kasutamisega seotud personal...................................................5
9. Temperatuuri riigietaloni ulatuse laiendamise tasuvus ..........................................................6
1
1. Sissejuhatus
Temperatuuri riigietalon koosneb kinnispunktidest, interpoleerivatest termomeetritest,
termostaatidest, takistuse mõõtesildadest, takistuspoolidest. Riigi- ja tugietalonide nimistu
kehtestab valdkonna eest vastutav minister määrusega. Hetkel kehtiva määruse kohaselt on
temperatuuri riigietalon ulatusega (-80...+400) °C.
Temperatuuri riigietaloni mõõtevõime laienduse eesmärk on läbi indiumi kinnispunkti
(156,5985 °C) lisamise kindlustada etaloni usaldusväärsus ja parem mõõtevõime. Vedela
lämmastiku keemistemperatuuri (-196 °C) lisandumine temperatuuri riigietaloni mõõtevõime
hulka tagab mõõtevõime laienemise väga madalate temperatuuride juurde, mis võimaldab
pakkuda tuge ettevõtetele ja asutustele, kellel on tarvis kalibreerida väga madalatel
temperatuuridel toimivaid seadmeid (näiteks ravimi- või vaktsiinikülmikud) või madalaid
temperatuure mõõtvaid seadmeid (näiteks termomeetrid ning temperatuurimeerikud
temperatuuritundlike ravimite ning vaktsiinide tootmisel, transpordil, ladustamisel või
levitamisel).
Tabel 1. Temperatuuri riigietaloni laienduse objektid
Kalibreerimis- või
Mõõdetav suurus/Objekt Mõõteväärtus/piirkond mõõtevõime
(laiendmääramatus, k = 2)
Temperatuur,
plaatinatakistustermomeeter 156,5985 °C 0,0030 °C
indiumi sulamispunktis
Temperatuur, termomeeter
-196 °C 0,080 °C
võrdlusmeetodil
2. Mõisted
Kinnispunkt – temperatuuriskaala reeperpunkt, tasakaaluline suletud süsteem, mille
temperatuur on määratud mingi füüsikalise protsessi (faasisiire) poolt. Seetõttu on kinnispunktid
universaalsed ja taasesitatavad.
Takistuse mõõtesild – sildlülitusel põhinev takistuse mõõtmise seade.
Interpoleeriv termomeeter – defineerib temperatuuriskaala kinnispunktide vahelises
piirkonnas.
Dewari anum - anum, millel on kahekordne sein (seinavahelises õõnsuses on tekitatud vaakum),
et tõkestada soojusvahetust ümbritseva keskkonnaga.
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3. Mõõte- ja abivahendid
Tabelites 2 ja 3 on esitatud vajalikud mõõte- ja abivahendid temperatuuri ühiku hoidmise ja
edasiandmise laienduseks, kusjuures (*) tähistatud mõõte- või abivahendid on ristkasutatavad
teiste juba kinnitatud temperatuuri riigietalonidega.
Laienduse teostamiseks on liht- või riigihankega hangitud vaid:
- indiumi kinnispunkt
- ühtlustusplokiga vedela lämmastiku dewari anum
Tabel 2. Mõõtevahendid temperatuuri ühiku säilitamise laienduseks (1 mK = 0,001 °C)
Mõõtevahend Tüüp Number Mõõtepiirkond Laiendmääramatus
Indiumi Isotech 490 411033/1 156,5985 °C 0,7 mK
kinnispunkt
Takistuse microK 70 421181/2 takistuse suhe 0,5 ppm
mõõtesild* kuni 13:1
Takistuse MI 6010T 1102105 takistuse suhe 0,1 ppm
mõõtesild* kuni 13:1
Interpoleeriv Isotech 670SQ 052 (-40..+420) °C (1...6) mK
termomeeter*
Interpoleeriv Isotech 670SQ 579 (-196...+420) °C (0,1...1,2) mK
termomeeter*
Interpoleeriv Isotech 670SQ 580 (-196...+420) °C (0,1...1,2) mK
termomeeter*
Interpoleeriv Fluke 5626 4783 (-189...+420) °C (1...2) mK
termomeeter*
Etalontakistid* 5685A 280083 10 Ω 1,0 ppm
274862 25 Ω 3,0 ppm
274521 100 Ω 1,0 ppm
474924 100 Ω 1,0 ppm
Etalontakistid* CER6000 052702-01 10 Ω 0,40 ppm
054359-09 25 Ω 0,40 ppm
067527-01 100 Ω 0,10 ppm
085828-01 300 Ω 0,21 ppm
075827-01 400 Ω 0,21 ppm
085827-02 400 Ω 0,21 ppm
Tabel 3. Abivahendid temperatuuri ühiku säilitamise laienduseks
Mõõtevahend Tüüp Number Mõõtepiirkond Gradiendid või muu
iseloomustus
Ühtlustusplokiga Fluke 10120 -196 °C (vedela Radiaalne gr. 3,6 mK
vedela 7196B-13 lämmastiku Aksiaalne gr. 33,4 mK
lämmastiku keemistemperatuur) Homogeensus 33,5 mK
dewari anum
Etalontakistite Isotech 455 431128/1 (10...30) °C Stabiilsus ja gradiendid
termostaat* kokku <0,005 °C
3
Temperatuuri microsKanner 421181/1 takistuse suhe kuni 0,1 ppm
mõõtesilla 13:1
ümberlüliti*
4. Jälgitavusahel
Mõõtevahendid, mis on vajalikud mõõtmise jälgitavuse tagamiseks, on kalibreeritud Eesti
elektriliste suuruste etalonlaboris (AS Metrosert), Soome metroloogia keskasutuses VTT/Mikes ja
N.T.P.L Isothermal Tehnology LTD-s (Ühendkuningriik).
5. Mõõtevõime
Mõõtevõime tõestamiseks on teostatud positiivse tulemusega võrdluskatseid Soome
metroloogia keskasutuses VTT/Mikes, Eesti akrediteeritud kalibreerimislaboriga GW Berg OÜ ja
rahvusvaheline võrdlusmõõtmine Sloveenia metroloogia keskasutuse LMK juhtimisel.
Temperatuuri riigietaloni aparatuur võimaldab osutada kalibreerimisteenust tabelis 4 esitatud
mõõteulatustes. Riigietaloni kalibreerimis- ja mõõtevõime on akrediteeritud Eesti
Akrediteerimiskeskuse poolt (akrediteerimistunnistus nr K001). Kalibreerimisel kasutatakse
juhendit KJ/ET-1.2 „Takistustermomeetrite kalibreerimine“. Osaliselt on mõõtevõime ka kantud
rahvusvahelisse andmebaasi KCDB.
Tabel 4. Temperatuuri riigietalon labori kalibreerimis- ja mõõtevõime
Mõõdetav suurus Nimiväärtus või Laiend- Riigietalon Sisse
mõõtepiirkond määramatus kantud
KCDB-sse
Etalonplaatina -196 °C 0,080 °C Laiendus ei
takistustermomeetrid (-80...-40) °C 0,040 °C Olemasolev töös
ja (-40...+200) °C 0,0080 °C Olemasolev töös
tööstuslikud plaatina (+200...+400) °C 0,040 °C Olemasolev töös
takistustermomeetrid -38,8344 °C (Hg) 0,0035 °C Olemasolev jah
0,01 °C (H2O) 0,0010 °C Olemasolev ootel
29,7646 °C (Ga) 0,0020 °C Olemasolev jah
156,5985 °C (In) 0,0030 °C Laiendus ei
231,928 °C (Sn) 0,0049 °C Olemasolev jah
419,527 °C (Zn) 0,0066 °C Olemasolev jah
6. Etaloni metroloogilisi omadusi tõendavad dokumendid
Metroloogilisi omadusi tõendavad dokumendid on:
1. Eesti Akrediteerimiskeskuse akrediteerimistunnistus nr K001
2. Plaatina takistustermomeetri rahvusvaheline võrdlusmõõtmine number
AG_2024_R_0014 EN.
Tõendusdokumentatsioon on taotlusele lisatud.
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7. Temperatuuri riigietaloni laboriruum
Temperatuuri riigietalone säilitatakse ja kasutatakse ASi Metrosert poolt renditavas laboris
aadressiga Teaduspargi 8, Tallinn. Tabelis 5 on kirjeldatud Teaduspargi 8 temperatuuri riigietaloni
laboriruumi tingimusi.
Tabel 5. Temperatuuri riigietaloni laboriruumi kirjeldus
Üldkirjeldus Laboriruum külgneb koridoriga, ühelt poolt optika
laboriga ja teiselt poolt füüsika-keemia laboriga.
Laboril on ainult üks sissepääs, selle uks on
lukustatav ja juurdepääs on piiratud arvul
ASi Metroserdi töötajatel.
Labor on varustatud piisava elektrivõimsusega,
ventilatsiooniga, veega, konditsioneeriga.
Laboriruumi kõik seinad on siseseinad.
Aknad: Laboril aknad puuduvad
Ruumi kõrgus: Laboriruumi kõrgus on 2,95 m
Juurdepääs laborile: Juurdepääsu koridoride laius kitsaimas kohas on
1,6 m.
Ukseava laius on 0,9 m.
Paiknemine: 2. korrus
Konditsioneerimine Üldine
Vahemik:19,0 °C…23,0 °C (töö ajal)
Temperatuuri seadepunkt/stabiilsus:
Stabiilsus: ΔT ≤ 1,0 °C/h (töö ajal)
Eriventilatsioon kuumade ja erivedelikega
töötamiseks rakendatud, labor varustatud
Ohutusnõuete täitmine tööl kuumade ja
suitsuandurite ja tulekustutustekiga ja
erivedelikega
tulekustutiga.
Üks roostevaba kraanikauss külma ja sooja veega.
Labori kogupindala: 34 m2
8. Riigietaloni säilitamisega ja kasutamisega seotud personal
Temperatuuri riigietaloni säilitamisega ja kasutamisega tegeleb Kristjan Tammik, kes on
ASi Metrosert töötaja olnud aastast 2004 ning tegelenud peale temperatuuri mõõtmiste ka
optiliste, rõhu, kulu, suhtelise niiskuse ning füüsikalis-keemiliste mõõtmistega (Curriculum Vitae
vt https://www.etis.ee/CV/Kristjan_Tammik/est/). K. Tammik on lõpetanud Tallinna
Tehnikaülikooli tehnilise füüsika eriala 2005 aastal.
K. Tammik töötab ASis Metrosert temperatuuri riigietaloni teadur-etalonihoidjana. K. Tammik on
läbi katsetanud ja töösse juurutanud kõik temperatuuri mõõtühiku etaloni koosseisu kuuluvad
mõõte- ja abivahendid. K. Tammik on osalenud lektorina temperatuuri mõõtmiste alal mitmel
siseriiklikul seminaril ja koolitusel ning osaleb audittorina ettevõtte siseaudititel. K. Tammik on
Eesti esindaja EURAMETi temperatuuri tehnilises komitees.
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9. Temperatuuri riigietaloni ulatuse laiendamise tasuvus
Aastatel 2022-2025 on Metrosert investeerinud temperatuuri riigietaloni arendamiseks põhivara
ehk seadmete soetamisse 102 424 eurot, investeerimiseks vajalikud vahendid pärinevad
peamiselt majandus- ja kommunikatsiooniministeeriumi teadus- ja arendusrahastusest, millest
laiendusega seotud kulud moodustavad väiksema osa. Suuremas osas on investeeritud
peamiselt 2004. aastast pärit kogu temperatuuri riigietaloni taristu uuendamisesse, et tagada
riigietaloni pikaaegne toimepidevus.
Temperatuuri riigietaloni laiendusega ei kaasne olulisi lisanduvaid tegevuskulusid, sest
seadmete maksumus on kaetud. Laienduse tulemusena ei ole vaja investeerida lisatööjõudu või
-laboriruumi. Küll aga võimaldab laiendus osutada senisest täpsemat kalibreerimisteenust, mille
vastu tuntakse huvi ka naaberriikidest. Samuti võimaldab temperatuuri riigietaloni laiendus
pakkuda senisest laiema ulatusega kalibreerimisteenust Eesti kalibreerimislaboritele.
Tabelis 6 on esitatud kogu temperatuuri riigietaloni valdkonna tasuvusanalüüs, millest taotletav
laiendus moodustab väikese osa, mida ei ole võimalik ülejäänud teenuse tuludest ja kuludest
eristada.
Tabel 6. Temperatuuri riigietaloni valdkonna tasuvusanalüüs
2026 2027 2028 2029 2030
Tulud 25000 32000 37000 40000 44000
Teenuste müük (konsultatsioon ja 20000 22000 25000 28000 30000
mõõteteenused)
Tulu TA-projektidest 5000 10000 12000 12000 14000
Kulud -109250 -114088 -119229 -124697 -130514
Valdkonna otsekulud -10000 -11000 -12100 -13310 -14641
Personaliga seotud kulud -57400 -60270 -63284 -66448 -69770
Valdkonna arendamiseks vajalikud -25000 -25000 -25000 -25000 -25000
investeeringud
Üldkulud 25% (sh pindadega seotud kulud, -16850 -17818 -18846 -19939 -21103
admin kulud)
Kokku -84250 -82088 -82229 -84697 -86514
6
Saatja:
[email protected]
Saaja: "info - MKM" <
[email protected]>
Teema: 1-6.6/61 Optiliste suuruste ja elektrilise võimsuse riigietaloni kinnitamise ja temperatuuri riigietaloni laiendamise taotlused
Kuupäev: 2026-06-03 08:08
Tähelepanu! Tegemist on välisvõrgust saabunud kirjaga.
Tundmatu saatja korral palume linke ja faile mitte avada.
Tere
Esitame vastavalt mõõteseadusele ja majandus- ja kommunikatsiooniministri
määrusele "Riigi- ja tugietalonide valiku, kinnitamise, säilitamise ja
kasutamise kord, nende säilitamiseks, arendamiseks, kalibreerimiseks ja
rahvusvaheliseks võrdlemiseks tehtavate põhjendatud kulutuste loetelu ning
riigi- ja tugietalonide nimistu" AS Metrosert taotlused optiliste suuruste
ja elektrilise võimsuse riigietaloni kinnitamiseks ja temperatuuri
riigietaloni laiendamiseks (lisatud).
Lugupidamisega
Maris Salin
Projektide spetsialist
Teadus- ja arendusdivisjon
+372 5384 2850|
[email protected]
AS Metrosert
Teaduspargi 8 | 12618 Tallinn
www.metrosert.ee
<http://email.mg.metrosert.ee/o/eJxEzj1OAzEQQOHTrDtWY3v8V0wRAUVabjD2jJMVmEW7FudHEUX6p0_vMn7u-8Ef-sVT5Tp1XN8ohwDZCGEolY2STRkwobXF3ClhF3QAOViOIbbYobaqzL4HYQGzkQMXIYKHDNmX1fsWe5JasalKaAvCuK1D57GfesxV1Qw9T77pyya0-Fe35iIszmLnFGqUGrPDBYH_b9eCafHv5qDtu-8P7nM8lEmXZ2B-yf0FAAD__2RpQb0>