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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
 
Brazil, ON/DSHO (Observatório Nacional/Serviço Nacional da Hora)
Complete CMCs in Time and Frequency for Brazil (.PDF file)
Frequency. General frequency source, 5 MHz
Relative expanded uncertainty (k = 2, level of confidence 95%) in Hz/Hz: 3.2E-13
Dual mixer time difference method
Averaging time: 1 h
Approved on 19 October 2009
Internal NMI service identifier: ON/DSHO/2423
 
Frequency. General frequency source, 10 MHz
Relative expanded uncertainty (k = 2, level of confidence 95%) in Hz/Hz: 3.2E-13
Dual mixer time difference method
Averaging time: 1 h
Approved on 19 October 2009
Internal NMI service identifier: ON/DSHO/2423
 
Frequency. Local frequency standard, 1 MHz
Relative expanded uncertainty (k = 2, level of confidence 95%) in Hz/Hz: 3.2E-13
Dual mixer time difference method
Averaging time: 1 h
Approved on 19 October 2009
Internal NMI service identifier: ON/DSHO/2423
 
Frequency. Local frequency standard, 5 MHz
Relative expanded uncertainty (k = 2, level of confidence 95%) in Hz/Hz: 3.2E-13
Dual mixer time difference method
Averaging time: 1 h
Approved on 19 October 2009
Internal NMI service identifier: ON/DSHO/2423
 
Frequency. Local frequency standard, 10 MHz
Relative expanded uncertainty (k = 2, level of confidence 95%) in Hz/Hz: 3.2E-13
Dual mixer time difference method
Averaging time: 1 h
Approved on 19 October 2009
Internal NMI service identifier: ON/DSHO/2423
 
Time scale difference. Local clock vs. UTC, -1 s to 1 s
Absolute expanded uncertainty (k = 2, level of confidence 95%) in ns: 46.6
Procedure using an ensemble of Cs beam frequency standards and a microphase-stepper that compose the Brazilian Atomic Time Scale (ETAB); time interval counter method, prediction time for 30 days
Averaging time: 5 days
Approved on 19 October 2009
Internal NMI service identifier: ON/DSHO/2421


 
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