[time-nuts] OCXO and fluctuations after EFC adjustment

[Taka Kamiya]

I have a few HP10811 and was thinking of making an interesting setup:  A setup where frequency is purposely offset by user defined amount by few Hz, and make it selectable.

Under normal setup, I would use a potentiometer and EFC control the frequency.  When I adjust EFC, the frequency immediately moves but then drifts.  It takes an hour or so to settle down again, then I have to readjust.  Due to precision of my testing setup, I am unable to quantify this.  

Is this a nature of OCXO in general or is this unique to HP10811?

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(Mr.) Taka Kamiya
KB4EMF / ex JF2DKG