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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)
China, NIM (National Institute of Metrology)
Time scale difference ,
Time scale difference
:
-0.5 s to 0.5 s
Remote clock vs UTC(NIM)
Absolute expanded uncertainty
:
9 ns
GPS common view
Measurement time : 1 d
Approved on 05 October 2023
Institute service identifier : NIM/TF-3
CMC ID :
APMP-TF-CN-000009DY-3
Frequency ,
Frequency
:
10 MHz
Remote frequency standard
Relative expanded uncertainty
:
8.0E-14 Hz/Hz
BD common view
Measurement time : 1 d
Amplitude : > 0.5 V (50 Ω)
Approved on 24 November 2023
Institute service identifier : NIM/TF-38
CMC ID :
APMP-TF-CN-00000P0K-1
Frequency ,
Frequency
:
100 MHz
Remote frequency standard
Relative expanded uncertainty
:
8.0E-14 Hz/Hz
GPS common view
Measurement time : 1 d
Amplitude : > 0.5 V (50 Ω)
Approved on 24 November 2023
Institute service identifier : NIM/TF-16
CMC ID :
APMP-TF-CN-000009EH-2
Frequency ,
Frequency
:
5 MHz
Remote frequency standard
Relative expanded uncertainty
:
8.0E-14 Hz/Hz
GPS common view
Measurement time : 1 d
Amplitude : > 0.5 V (50 Ω)
Approved on 24 November 2023
Institute service identifier : NIM/TF-14
CMC ID :
APMP-TF-CN-000009EF-2
Time scale difference ,
Time scale difference
:
-0.5 s to 0.5 s
Remote clock vs UTC
Absolute expanded uncertainty
:
1.1E1 ns
BD common view
Measurement time : 1 d
Prediction time : 20 d
Approved on 25 October 2023
Institute service identifier : NIM/TF-36
CMC ID :
APMP-TF-CN-00000P0I-1
Frequency ,
Frequency
:
100 MHz
Remote frequency standard
Relative expanded uncertainty
:
8.0E-14 Hz/Hz
BD common view
Measurement time : 1 d
Amplitude : > 0.5 V (50 Ω)
Approved on 24 November 2023
Institute service identifier : NIM/TF-39
CMC ID :
APMP-TF-CN-00000P0L-1
Frequency ,
Frequency
:
5 MHz
Remote frequency standard
Relative expanded uncertainty
:
8.0E-14 Hz/Hz
BD common view
Measurement time : 1 d
Amplitude : > 0.5 V (50 Ω)
Approved on 24 November 2023
Institute service identifier : NIM/TF-37
CMC ID :
APMP-TF-CN-00000P0J-1
Time scale difference ,
Time scale difference
:
-0.5 s to 0.5 s
Remote clock vs UTC
Absolute expanded uncertainty
:
1.1E1 ns
GPS common view
Measurement time : 1 d
Prediction time : 20 d
Approved on 05 October 2023
Institute service identifier : NIM/TF-4
CMC ID :
APMP-TF-CN-000009DZ-2
Time scale difference ,
Time scale difference
:
-0.5 s to 0.5 s
Remote clock vs UTC(NIM)
Absolute expanded uncertainty
:
9 ns
BD common view
Measurement time : 1 d
Approved on 25 October 2023
Institute service identifier : NIM/TF-35
CMC ID :
APMP-TF-CN-00000P0H-1
Frequency ,
Frequency
:
10 MHz
Remote frequency standard
Relative expanded uncertainty
:
8.0E-14 Hz/Hz
GPS common view
Measurement time : 1 d
Amplitude : > 0.5 V (50 Ω)
Approved on 24 November 2023
Institute service identifier : NIM/TF-15
CMC ID :
APMP-TF-CN-000009EG-2
Viet Nam, VMI-STAMEQ (Viet Nam Metrology Institute, Directorate for Standards and Quality)
Items for defining ITS-90 ,
Temperature
:
419.527 °C
SPRT
Absolute expanded uncertainty
:
2 mK
Zinc freezing point cell
3-zone furnace, seal cellModified on 09 February 2015
Approved on 22 January 2013
Institute service identifier : VMI-STAMEQ/T-5-132
CMC ID :
APMP-T-VN-000006YG-1
Items for defining ITS-90 ,
Temperature
:
29.7646 °C
SPRT
Absolute expanded uncertainty
:
0.6 mK
Gallium melting point cell
Cryostat, seal cellModified on 09 February 2015
Approved on 22 January 2013
Institute service identifier : VMI-STAMEQ/T-3-132
CMC ID :
APMP-T-VN-000006YE-1
Items for defining ITS-90 ,
Temperature
:
-38.8344 °C
SPRT
Absolute expanded uncertainty
:
0.5 mK
Mercury triple point cell
Cryostat, seal cellModified on 09 February 2015
Approved on 22 January 2013
Institute service identifier : VMI-STAMEQ/T-1-132
CMC ID :
APMP-T-VN-000006YD-1
Pressure ,
Gauge pressure: oil medium
:
0.5 MPa to 100 MPa
Pressure gauge
Absolute expanded uncertainty
6.0E-05p p pressure in Mpa
The uncertainty is expressed in MPa
Direct comparison with pressure standard
Temperature : (20 ± 2) °C
Approved on 18 October 2011
Institute service identifier : VMI-P-2-3.2.2
CMC ID :
APMP-M-VN-00000617-1
Pressure ,
Absolute pressure: oil medium
:
0.5 MPa to 100 MPa
Pressure gauge
Absolute expanded uncertainty
6.0E-05p p pressure in Mpa
The uncertainty is expressed in MPa
Direct comparison with pressure standard
Temperature : (20 ± 2) °C
Approved on 18 October 2011
Institute service identifier : VMI-P-1-3.1.2
CMC ID :
APMP-M-VN-00000616-1
Pressure ,
Gauge pressure: oil medium
:
0.5 MPa to 100 MPa
Pressure balance
Absolute expanded uncertainty
5.5E-05p p pressure in Mpa
The uncertainty is expressed in MPa
Direct comparison with pressure standard: crossfloat
Temperature : (20 ± 2) °C
Approved on 18 October 2011
Institute service identifier : VMI-P-2-3.2.2
CMC ID :
APMP-M-VN-00000618-1
Items for defining ITS-90 ,
Temperature
:
231.928 °C
SPRT
Absolute expanded uncertainty
:
1.2 mK
Tin freezing point cell
3-zone furnace, seal cellModified on 09 February 2015
Approved on 22 January 2013
Institute service identifier : VMI-STAMEQ/T-4-132
CMC ID :
APMP-T-VN-000006YF-1
