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Monitoring the performance of the primary frequency sources continuously through comparing it versus the transfer standards and the calibration of the secondary frequency sources periodically versus the primary ones are of the main missions assigned to any time and frequency laboratory either it was a calibration laboratory or a national metrological laboratory. An automatic Generalized System (GS) for monitoring/calibrating any frequency source that has a Relative Frequency Offset (RFO)doi:10.1051/ijmqe/2015004 fatcat:nha564udyfgpxafrev6mz6upwm