[time-nuts] 60 Hz frequency and phase measurement

[Mark Sims]

Attached is a plot of line frequency measurements made by the FTM-III card in a Truetime XL-DC.  The FTM-III is meant for measuring line frequency in generating stations, etc.  It has a 0.001 Hz resolution.  This plot shows a 3 hour window of data,  histogram of the data, and ADEV/HDEV/MDEV/TDEV.  Also statistics of the data are shown in the lower left corner.
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