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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)
Costa Rica, LAMETRO-ICE (Laboratorio de Metrologia, Instituto Costarricense de Electricidad)
Frequency ,
Frequency
:
1 MHz
Local frequency standard
Relative expanded uncertainty
:
3.0E-11 Hz/Hz
Direct frequency measurement of oscillator
Averaging time : 1 s to 86400 s
Gate time : 1 s
Number of measurements : 259200
Signal amplitude (V rms) : < 5 V into 50 Ω and 1 MΩ
Approved on 02 December 2014
Institute service identifier : LAMETRO-ICE/TF 2.1.2
CMC ID :
SIM-TF-CR-00000O0C-1
Frequency ,
Frequency
:
1.00E6 Hz to 2.25E8 Hz
General frequency source
Relative expanded uncertainty
:
3.0E-11 Hz/Hz
Direct frequency measurement
Averaging time : 1 s to 86400 s
Gate time : 1 s
Number of measurements : 259200
Signal amplitude (V rms) : < 5 V into 50 Ω and 1 MΩ
Approved on 02 December 2014
Institute service identifier : LAMETRO-ICE/TF 2.2.3
CMC ID :
SIM-TF-CR-00000O0H-1
Time interval ,
Time interval
:
8.64E4 s to 6.05E5 s
Period meter
Relative expanded uncertainty
:
2.0E-7 s/s to 7.0E-7 s/s
Visual comparison against standard time display
Averaging time : 1 day to 5 days
Approved on 02 December 2014
Institute service identifier : LAMETRO-ICE/TF 3.3.2
CMC ID :
SIM-TF-CR-00000O0L-1
Fibre optics ,
Responsivity
Fibre optic power meter
Relative expanded uncertainty
:
1.1 %
Laser source and reference fibre optic power meter
IEC 61315
Temperature : (23 ± 2) ºC
Humidity : (40 ± 10) %
Wavelength : 1310 nm and 1550 nm
Optical power level : 100 μW (-10 dBm)
Bandwidth : < 5 nm
Approved on 01 October 2022
Institute service identifier : LM-I-008
CMC ID :
SIM-PR-CR-00000NG2-1
Time interval ,
Time interval
:
3.28E4 Hz
Period meter
Relative expanded uncertainty
:
2.0E-10 s/s
Direct frequency measurement of internal quartz oscillator
Averaging time : 1 s to 86400 s
Gate time : 1 s
Number of measurements : 259200
Signal amplitude (V rms) : < 5 V into 50 Ω and 1 MΩ
Approved on 02 December 2014
Institute service identifier : LAMETRO-ICE/TF 3.3.1
CMC ID :
SIM-TF-CR-00000O0K-1
Frequency ,
Frequency
:
100 kHz
Local frequency standard
Relative expanded uncertainty
:
5.0E-11 Hz/Hz
Direct frequency measurement of oscillator
Averaging time : 1 s to 86400 s
Gate time : 1 s
Number of measurements : 259200
Signal amplitude (V rms) : < 5 V into 50 Ω and 1 MΩ
Approved on 02 December 2014
Institute service identifier : LAMETRO-ICE/TF 2.1.1
CMC ID :
SIM-TF-CR-00000O0B-1
Frequency ,
Frequency
:
1.00E4 Hz to 2.25E8 Hz
Frequency meter
Relative expanded uncertainty
:
3.0E-11 Hz/Hz
Direct frequecy measurement of its time base
Averaging time : 1 s to 86400 s
Gate time : 1 s
Number of measurements : 259200
Signal amplitude (V rms) : < 5 V into 50 Ω and 1 MΩ
Approved on 02 December 2014
Institute service identifier : LAMETRO-ICE/TF 2.3.2
CMC ID :
SIM-TF-CR-00000O0J-1
Fibre optics ,
Optical Length (distance scale deviation)
:
7.5 km to 100 km
OTDR
Relative expanded uncertainty
:
2.4E-5 m/m to 3.4E-5 m/m
Uncertainty table
{"row_1":{"col_1":"Nominal Walelength (nm)","col_2":"Expanded Uncertainty (m/m) (k=2)"},"row_2":{"col_1":"1310","col_2":"2.4E-5"},"row_3":{"col_1":"1550","col_2":"3.4E-5"}}
Recirculating delay line
IEC 61746-1
Temperature : (23 ± 2) °C
Humidity : (40 ± 10) %
Nominal wavelength : 1310 nm and 1550 nm
Approved on 01 October 2022
Institute service identifier : LM-I-016
CMC ID :
SIM-PR-CR-00000NFX-1
Fibre optics ,
Vacuum wavelength
:
1250 nm to 1650 nm
Fibre optic source
Absolute expanded uncertainty
:
3.9E-2 nm to 6.7E-2 nm
U = 4.24870E-10 * W^3 - 1.47601E-6 * W^2 + 1.53173E-3 * W - 0.37101 W: Wavelength to be measured in [nm]; U: Expanded uncertainty (k=2) in [nm]
Optical spectrum analyzer
IEC 62129-1
Temperature : (23 ± 2) °C
Humidity : (40 ± 10) %
Approved on 01 October 2022
Institute service identifier : LM-I-010
CMC ID :
SIM-PR-CR-00000NFV-1
Fibre optics ,
Vacuum wavelength
:
1510 nm to 1540 nm
Optical spectrum analyzer
Absolute expanded uncertainty
:
6.0E-3 nm
Absortion cell
IEC 62129-1
Temperature : (23 ± 2) °C
Humidity : (40 ± 10) %
Approved on 01 October 2022
Institute service identifier : LM-I-011
CMC ID :
SIM-PR-CR-00000NFW-1
Frequency ,
Frequency
:
10 MHz
Local frequency standard
Relative expanded uncertainty
:
3.0E-11 Hz/Hz
Direct frequency measurement of oscillator
Averaging time : 1 s to 86400 s
Gate time : 1 s
Number of measurements : 259200
Signal amplitude (V rms) : < 5 V into 50 Ω and 1 MΩ
Approved on 02 December 2014
Institute service identifier : LAMETRO-ICE/TF 2.1.4
CMC ID :
SIM-TF-CR-00000O0E-1
Frequency ,
Frequency
:
1.00E4 Hz to 2.25E8 Hz
Frequency counter
Relative expanded uncertainty
:
3.0E-11 Hz/Hz
Direct frequecy measurement of its time base
Averaging time : 1 s to 86400 s
Gate time : 1 s
Number of measurements : 259200
Signal amplitude (V rms) : < 5 V into 50 Ω and 1 MΩ
Approved on 02 December 2014
Institute service identifier : LAMETRO-ICE/TF 2.3.1
CMC ID :
SIM-TF-CR-00000O0I-1
Frequency ,
Frequency
:
1.00E4 Hz to 1.00E5 Hz
General frequency source
Relative expanded uncertainty
:
3.0E-7 Hz/Hz
Direct frequency measurement
Averaging time : 1 s to 86400 s
Gate time : 1 s
Number of measurements : 259200
Signal amplitude (V rms) : < 5 V into 50 Ω and 1 MΩ
Approved on 02 December 2014
Institute service identifier : LAMETRO-ICE/TF 2.2.1
CMC ID :
SIM-TF-CR-00000O0F-1
Frequency ,
Frequency
:
1.00E5 Hz to 1.00E6 Hz
General frequency source
Relative expanded uncertainty
:
3.0E-8 Hz/Hz
Direct frequency measurement
Averaging time : 1 s to 86400 s
Gate time : 1 s
Number of measurements : 259200
Signal amplitude (V rms) : < 5 V into 50 Ω and 1 MΩ
Approved on 02 December 2014
Institute service identifier : LAMETRO-ICE/TF 2.2.2
CMC ID :
SIM-TF-CR-00000O0G-1
Fibre optics ,
Optical Length (distance scale offset)
:
7.5 km to 100 km
OTDR
Absolute expanded uncertainty
:
5.0E-2 m to 1.3 m
Uncertainty table
{"row_1":{"col_1":"Nominal Walelength (nm)","col_2":"Expanded Uncertainty (m) (k=2)"},"row_2":{"col_1":"1310","col_2":"0.050"},"row_3":{"col_1":"1550","col_2":"1.3"}}
Recirculating delay line
IEC 61746-1
Temperature : (23 ± 2) °C
Humidity : (40 ± 10) %
Nominal wavelength : 1310 nm and 1550 nm
Approved on 01 October 2022
Institute service identifier : LM-I-016
CMC ID :
SIM-PR-CR-00000NG1-1
Frequency ,
Frequency
:
5 MHz
Local frequency standard
Relative expanded uncertainty
:
3.0E-11 Hz/Hz
Direct frequency measurement of oscillator
Averaging time : 1 s to 86400 s
Gate time : 1 s
Number of measurements : 259200
Signal amplitude (V rms) : < 5 V into 50 Ω and 1 MΩ
Approved on 02 December 2014
Institute service identifier : LAMETRO-ICE/TF 2.1.3
CMC ID :
SIM-TF-CR-00000O0D-1
