On 1/15/2021 8:30 PM, paul swed wrote:
Not sure how hard it might be to get a thermocouple into the oven. That would give you a hint. Regards Paul
Seems to me you already have a temperature sensor in the OCXO.
If you temperature soak it overnight and monitor the frequency as power is applied, you should see the starting freq of the oscillator. The heater will come on immediately and start it warming up, but the oscillator should stabilize in less than a 100 ms or so, and the heater should not be a major factor. Do this at several temps and you should get a pretty decent picture.
I suspect the fly in the ointment in this approach is that the oven temp is usually picked to be around the flattest spot in the temp/freq curve. You may not see much resolution.
You can also monitor oven current which I guess should translate to a temperature error term, though I'm not sure off hand how you'd calibrate that.
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