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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. Frequency counter, 200 Hz to < 1.0E+05 Hz
Relative expanded uncertainty (k = 2, level of confidence 95%) in Hz/Hz: 6E-09
Procedure using frequency synthesizers with external atomic time base
Averaging time: variable
Approved on 19 October 2009
Internal NMI service identifier: ON/DSHO/2424
 
Frequency. Frequency counter, 1.0E+05 Hz to < 640.0E+06 Hz
Relative expanded uncertainty (k = 2, level of confidence 95%) in Hz/Hz: 1E-08
Procedure using frequency synthesizers with external atomic time base
Averaging time: variable
Approved on 19 October 2009
Internal NMI service identifier: ON/DSHO/2424
 
Frequency. Frequency counter, 6.4E+08 Hz to < 1.28E+09 Hz
Relative expanded uncertainty (k = 2, level of confidence 95%) in Hz/Hz: 4E-10
Procedure using frequency synthesizers with external atomic time base
Averaging time: variable
Approved on 19 October 2009
Internal NMI service identifier: ON/DSHO/2424
 
Frequency. Frequency counter, 1.28E+09 Hz to < 2.56E+09 Hz
Relative expanded uncertainty (k = 2, level of confidence 95%) in Hz/Hz: 4E-10
Procedure using frequency synthesizers with external atomic time base
Averaging time: variable
Approved on 19 October 2009
Internal NMI service identifier: ON/DSHO/2424
 
Frequency. General frequency source, 0.1 MHz
Relative expanded uncertainty (k = 2, level of confidence 95%) in Hz/Hz: 3.2E-13
Time interval counter method
Averaging time: 1 h
Approved on 19 October 2009
Internal NMI service identifier: ON/DSHO/2423
 
Frequency. General frequency source, 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


 
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