Hi Scott,
The EFC is a nominal 2.826 volts, which I removed and plotted the last 2
decimal places. I'd have to do a lot of fiddling to find the range, but 50uV
looks about right from the plot. I'm going to let this bake for another day or
two to see if there's a time-related element to it after the thermal stuff
averages out. After that, I plan to take the software out of hold mode and see
what the EFC plot looks like as the DAC voltage changes over time.
Bob -----------------------------------------------------------------
AE6RV.com
GFS GPSDO list:
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From: Scott Stobbe <[email protected]>
To: Bob Stewart <[email protected]>; Discussion of precise time and frequency
measurement <[email protected]>
Sent: Monday, November 7, 2016 2:48 PM
Subject: Re: [time-nuts] Thermal impact on OCXO
Another nice plot! It looks like after 2am you see temperature swings of 1.5
degF roughly every 30 minutes? Correspondingly, the EFC line which is nominally
~2.8vdc sees swings of +-50 uV?
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