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In the CMCs uncertainty statements, the notation Q[a, b] stands for the root-sum-square of the terms between brackets: Q[a, b] = [a 2 + b 2]1/2
Unless otherwise stated the expanded uncertainties given below correspond to k = 2 (at a 95 % level of confidence)
Luxembourg, ILNAS (Bureau Luxembourgeois de Métrologie)
Time scale difference ,
Time scale difference
:
-1 s to 1 s
Local clocks vs UTC(LUX)
Absolute expanded uncertainty
:
2 ns
Time interval counter
Pulse amplitude : > 1 V on 50 Ω
Rise time : < 5 ns
Approved on 31 August 2021
CMC ID :
EURAMET-TF-LU-00000LOL-1
Frequency ,
Frequency
:
0.1 MHz to 4.00E4 MHz
Frequency counter
Relative expanded uncertainty
:
5.0E-12 Hz/Hz
General frequency source
Averaging time : 1000 s
Approved on 31 August 2021
CMC ID :
EURAMET-TF-LU-00000LRJ-1
DC voltage (up to 1100 V) ,
DC voltage sources: single values
:
1 V
Standard cell, solid state voltage standards
DC voltage sources, multifunction calibrators
Absolute expanded uncertainty
:
2 µV
Direct comparison with calibrated standards
Approved on 13 September 2025
CMC ID :
EURAMET-EM-LU-00000PXY-1
Time scale difference ,
Time scale difference
:
-1 s to 1 s
Remote clocks vs UTC(LUX)
Absolute expanded uncertainty
:
2.0E1 ns
GPS TAIP3 common view
Averaging time : 1 d
Approved on 31 August 2021
CMC ID :
EURAMET-TF-LU-00000LOJ-1
AC current ,
AC current up to 100 A: sources
:
0.01 A to 100 A
I-source
Relative expanded uncertainty
:
1.1E2 µA/A to 3.4E2 µA/A
Uncertainty table
{"row_1":{"col_1":"<br>","col_2":"40 Hz to 1 kHz"},"row_2":{"col_1":"10 mA to 12,5 mA","col_2":"340"},"row_3":{"col_1":"> 12,5 mA to 100 mA","col_2":"110"},"row_4":{"col_1":"> 100 mA to 125 mA","col_2":"340"},"row_5":{"col_1":"> 125 mA to 1 A","col_2":"110"},"row_6":{"col_1":"> 1 A to 1,25 A","col_2":"340"},"row_7":{"col_1":"> 1,25A to 10 A","col_2":"110"},"row_8":{"col_1":"> 10 A to 12,5 A","col_2":"340"},"row_9":{"col_1":" > 12,5 A to 100 A","col_2":"130"}}
Potential difference between terminals of standard resistance
Approved on 12 September 2025
CMC ID :
EURAMET-EM-LU-00000PYE-1
DC voltage (up to 1100 V) ,
DC voltage sources: single values
:
1 V
DC voltmeter, multimeter
Absolute expanded uncertainty
:
2 µV
Direct measurement
Approved on 13 September 2025
CMC ID :
EURAMET-EM-LU-00000PY0-1
Time interval ,
Time interval
:
1000 s to 1.00E5 s
Time difference source
Absolute expanded uncertainty
:
2.0E2 ns
Time interval counter
Pulse amplitude : > 1 V on 50 Ω
Rise Time : < 10 ns
Approved on 31 August 2021
CMC ID :
EURAMET-TF-LU-00000LOI-1
Frequency ,
Frequency
:
10 kHz to 100 kHz
Frequency counter
Relative expanded uncertainty
:
2.0E-10 Hz/Hz
General frequency source
Averaging time : 1000 s
Approved on 31 August 2021
CMC ID :
EURAMET-TF-LU-00000LRA-1
AC current ,
AC current up to 100 A: sources
:
0.01 A to 100 A
I-meter
Relative expanded uncertainty
:
1.1E2 µA/A to 3.4E2 µA/A
Uncertainty table
{"row_1":{"col_1":"<br>","col_2":"40 Hz to 1 kHz"},"row_2":{"col_1":"10 mA to 12,5 mA","col_2":"340"},"row_3":{"col_1":"> 12,5 mA to 100 mA","col_2":"110"},"row_4":{"col_1":"> 100 mA to 125 mA","col_2":"340"},"row_5":{"col_1":"> 125 mA to 1 A","col_2":"110"},"row_6":{"col_1":"> 1 A to 1,25 A","col_2":"340"},"row_7":{"col_1":"> 1,25A to 10 A","col_2":"110"},"row_8":{"col_1":"> 10 A to 12,5 A","col_2":"340"},"row_9":{"col_1":"> 12,5 A to 100 A","col_2":"130"}}
Potential difference between terminals of standard resistance
Approved on 12 September 2025
CMC ID :
EURAMET-EM-LU-00000PYF-1
Frequency ,
Frequency
:
1 Hz to 1.00E4 Hz
General frequency source
Relative expanded uncertainty
:
8.0E-11 Hz/Hz to 8.0E-7 Hz/Hz
8E-07/f with f the frequency measured
Direct frequency measurement
Averaging time : 1000 s
Amplitude : 1 to 5 V (50 ohm)
Approved on 31 August 2021
CMC ID :
EURAMET-TF-LU-00000LE6-1
Frequency ,
Frequency
:
0.35 GHz to 40 GHz
General frequency source
Relative expanded uncertainty
:
2.0E-12 Hz/Hz
Direct frequency measurement
Averaging time : 1000 s
Amplitude : max 18 dBm (50 Ohm)
Approved on 31 August 2021
CMC ID :
EURAMET-TF-LU-00000LE8-1
Time interval ,
Time interval
:
1.00E-9 s to 1000 s
Time difference source
Absolute expanded uncertainty
:
2 ns
Time interval counter
Pulse amplitude : > 1 V on 50 Ω
Rise Time : < 10 ns
Approved on 31 August 2021
CMC ID :
EURAMET-TF-LU-00000LOH-1
Frequency ,
Frequency
:
10 Hz to 1.00E4 Hz
Frequency counter
Relative expanded uncertainty
:
1.0E-7 Hz/Hz to 1.0E-10 Hz/Hz
1E-6/f with f the frequency measured
General frequency source
Averaging time : 1000 s
Approved on 31 August 2021
CMC ID :
EURAMET-TF-LU-00000LR9-1
DC current (up to 100 A) ,
DC current meters: intermediate value
:
0.01 A to 10 A
I-meter
Relative expanded uncertainty
:
2.8E1 µA/A
Potential difference between terminals of standard resistance
Approved on 12 September 2025
CMC ID :
EURAMET-EM-LU-00000PYC-1
DC current (up to 100 A) ,
DC current meters: intermediate value
:
10 A to 100 A
I-source
Relative expanded uncertainty
:
3.5E1 µA/A
Potential difference between terminals of standard resistance
Approved on 12 September 2025
CMC ID :
EURAMET-EM-LU-00000PY9-1
DC current (up to 100 A) ,
DC current meters: intermediate value
:
10 A to 100 A
I-meter
Relative expanded uncertainty
:
3.5E1 µA/A
Potential difference between terminals of standard resistance
Approved on 12 September 2025
CMC ID :
EURAMET-EM-LU-00000PYD-1
DC voltage (up to 1100 V) ,
DC voltage sources: single values
:
10 V
Standard cell, solid state voltage standards
DC voltage sources, multifunction calibrators
Absolute expanded uncertainty
:
6 µV
Direct comparison with calibrated standards
Approved on 13 September 2025
CMC ID :
EURAMET-EM-LU-00000PXZ-1
Frequency ,
Frequency
:
0.01 MHz to 350 MHz
General frequency source
Relative expanded uncertainty
:
2.0E-12 Hz/Hz
Direct frequency measurement
Averaging time : 1000 s
Amplitude : 1 to 5 V (50 ohm)
Approved on 31 August 2021
CMC ID :
EURAMET-TF-LU-00000LE7-1
DC voltage (up to 1100 V) ,
DC voltage sources: single values
:
10 V
DC voltmeter, multimeter
Absolute expanded uncertainty
:
6 µV
Direct measurement
Approved on 13 September 2025
CMC ID :
EURAMET-EM-LU-00000PY1-1
DC voltage (up to 1100 V) ,
DC voltage sources: single values
:
100 V
DC voltage source, multifunction calibrators
Absolute expanded uncertainty
:
2.0E2 µV
Comparison to a reference with a resistive divider
Approved on 13 September 2025
CMC ID :
EURAMET-EM-LU-00000PY2-1
