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Calibration and Measurement Capabilities
Time and Frequency
In the CMCs uncertainty statements, the notation Q[a, b] stands for the root-sum-square of the terms between brackets: Q[a, b] = [a2 + b2]1/2
 
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Your selection : Time and Frequency
 
Viet Nam, VMI-STAMEQ (Viet Nam Metrology Institute, Directorate for Standards and Quality)
Complete CMCs in Time and Frequency for Viet Nam (.PDF file)
Frequency. Local frequency standard, 10 MHz
Relative expanded uncertainty (k = 2, level of confidence 95%) in Hz/Hz: 2.0E-13
Direct frequency measurement
Gate time: 1000 s
Number of measurements: 100
Amplitude: > 0.5 V (50 )
DUT effects excluded
Approved on 19 July 2010
Internal NMI service identifier: VN2.1.1
 
Frequency. Local frequency standard, 5 MHz
Relative expanded uncertainty (k = 2, level of confidence 95%) in Hz/Hz: 2.0E-13
Direct frequency measurement
Gate time: 1000 s
Number of measurements: 100
Amplitude: > 0.5 V (50 )
DUT effects excluded
Approved on 19 July 2010
Internal NMI service identifier: VN2.1.1
 
Frequency. Local frequency standard, 1 MHz
Relative expanded uncertainty (k = 2, level of confidence 95%) in Hz/Hz: 2.0E-13
Direct frequency measurement
Gate time: 1000 s
Number of measurements: 100
Amplitude: > 0.5 V (50 )
DUT effects excluded
Approved on 19 July 2010
Internal NMI service identifier: VN2.1.1
 
Time scale difference. Local clock vs UTC, -1 s to 1 s
Absolute expanded uncertainty (k = 2, level of confidence 95%) in ns: 200
Time comparison against the predicted time
1 pps amplitude: > 0.5 V (50 )
Averaging time: 5 days
Prediction time: 45 days
DUT effects excluded
Approved on 19 July 2010
Internal NMI service identifier: VN1.1.2
 
Time scale difference. Local clock vs UTC(VMI), -1 s to 1 s
Absolute expanded uncertainty (k = 2, level of confidence 95%) in ns: 2
Time interval measurement
1 pps amplitude: > 0.5 V (50 )
Averaging time: 1 day
DUT effects excluded
Approved on 19 July 2010
Internal NMI service identifier: VN1.1.1