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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