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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)
France, LNE (Laboratoire national de métrologie et d'essais)
Radio frequency measurements , RF noise: phase noise : -172 dBc/Hz to 0 dBc/Hz
Oscillators, 2 port device
Absolute expanded uncertainty : 2 dB
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The expanded uncertainties given in this table are expressed in dB
Phase detector
Carrier frequency : (5 MHz to 500 MHz, 0.5 GHz to 18 GHz)
Offset frequency : 10 Hz, 100 Hz, 1 kHz, 10 kHz, 100 kHz
DUT power : > 0 dBm
Service provided by the LNE-LTFB
Approved on 06 August 2013
Institute service identifier : LNE/111
France, LNE-LTFB (Université de Franche-Comté, Laboratoire Temps-fréquence de Besançon)
Frequency , Frequency : 0.1 Hz to 1.30E9 Hz
General frequency source
Relative expanded uncertainty
8.5E-13 + 1.5E-06 / f

f in Hz, values range from 1.5E-05 to 8.5E-13

The uncertainty is expressed in Hz/Hz

Clock, counter
Averaging time : 1 000 s
Approved on 03 July 2019
Institute service identifier : LNE-LTFB/16
Frequency , Frequency : -1.00E-9 Hz/Hz to 1.00E-9 Hz/Hz
Remote frequency standard
Relative expanded uncertainty : 2.0E-13 Hz/Hz
GPS common view
Averaging time : 5 d
Approved on 03 July 2019
Institute service identifier : LNE-LTFB/21
Frequency , Frequency : 7.70E-13 Hz/Hz to 1.00E-8 Hz/Hz
Local frequency standard
Relative expanded uncertainty
max(2 % ; 2/(N/t)1/2)

The uncertainty is expressed in Hz/Hz

Disciplined frequency synthesizer
Frequency noise : < 1E-08
Averaging time, t : 1 s
Relative frequency difference : < 1E-11
Frequency, f : 5 MHz < f < 1.3 GHz
Measurement duration, N : N >= 100t
Frequency instability expressed by ADEV, rel. uncertainty of ADEV value in uncertainty
Approved on 03 July 2019
Institute service identifier : LNE-LTFB/83
Time interval , Time interval : 1.00E-5 s
Time difference meter
Absolute expanded uncertainty : 2.0E2 ns
Time interval source
This concerns the calibration of time interval meters over specific time interval values, a programmable time interval source is used to generate time intervals
Approved on 03 July 2019
Institute service identifier : LNE-LTFB/13
Time interval , Time interval : -1000 s to 1000 s
Time difference source
Absolute expanded uncertainty : 2 ns
Time interval counter
Pulse amplitude : > 1 V on 50 ohm
Rise time : < 5 ns
Approved on 03 July 2019
Institute service identifier : LNE-LTFB/4
Time interval , Time interval : 10 s
Time difference source
Absolute expanded uncertainty : 5 ms
Intervallometer, chronograph
Possibility of carrying out the measurement under controlled temperature conditions
Approved on 03 July 2019
Institute service identifier : LNE-LTFB/12
Time interval , Time interval : 1000 s to 8.64E4 s
Time difference source
Absolute expanded uncertainty : 2 µs
Time interval counter
Possibility of carrying out the measurement under controlled temperature conditions
Approved on 03 July 2019
Institute service identifier : LNE-LTFB/11
Frequency , Frequency : 5.80E-13 Hz/Hz to 1.00E-8 Hz/Hz
Local frequency standard
Relative expanded uncertainty
max(2 % ; 2/(N/t)1/2)

The uncertainty is expressed in Hz/Hz

Disciplined frequency synthesizer
Frequency noise : < 1E-08
Averaging time, t : 10 s, 100 s
Relative frequency difference : < 1E-11
Frequency, f : 5 MHz < f < 1.3 GHz
Measurement duration, N : N >= 100t
Frequency instability expressed by ADEV, rel. uncertainty of ADEV value in uncertainty
Approved on 03 July 2019
Institute service identifier : LNE-LTFB/84
Frequency , Frequency : 5.50E-12 Hz/Hz to 1.00E-8 Hz/Hz
Local frequency standard
Relative expanded uncertainty
max(2 % ; 2/(N/t)1/2)

The uncertainty is expressed in Hz/Hz

Disciplined frequency synthesizer
Frequency noise : < 1E-08
Averaging time, t : 0.1 s
Relative frequency difference : < 1E-11
Frequency, f : 5 MHz < f < 1.3 GHz
Measurement duration, N : N >= 100t
Frequency instability expressed by ADEV, rel. uncertainty of ADEV value in uncertainty
Approved on 03 July 2019
Institute service identifier : LNE-LTFB/82
Frequency , Frequency : -1.00E-9 Hz/Hz to 1.00E-9 Hz/Hz
Local frequency standard
Relative expanded uncertainty : 1.0E-13 Hz/Hz
Direct comparison to local frequency standard
Averaging time : 1 d
Traceability to UTC(OP) is provided by GPS CV link
Approved on 21 October 2001
Institute service identifier : LNE-LTFB/81
Frequency , Frequency : 1 MHz to 10 MHz
General frequency source
Relative expanded uncertainty : 6.0E-13 Hz/Hz
Clock, frequency offset multiplier, counter
Frequency : 1 MHz, 2 MHz, 2.5 MHz, 5 MHz, 10 MHz
Averaging time : 1 000 s
Approved on 03 July 2019
Institute service identifier : LNE-LTFB/14

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