To add a bit to this discussion I recently switched from using from using
HP5370B's for long term data collection to HP5335's. For plotting the long
term drift of two of my more stable OCXO's versus a GPSDO the 5335's combined
with Timelab work fine for my limited needs. Just for grins I compared the
same sources using both the 5370B's and the 5335's at the same time and
overlaid the ADEV plots, IIRC the results were identical for Tau's of approx
2,000 seconds and higher.
At times I also compare the OCXO's to one of my better Rb's (while also
comparing the OCXO's to the GPSDO) to provide a bit of a sanity check that the
GPSDO is behaving itself. I also wrote data collection routines using that
time stamp all of the data I collect which makes later comparisions
considerably easier.
Regards
Mark S
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