[time-nuts] EFC info on Trimble 34310-T OXCO
csteinmetz at yandex.com
Sun Aug 24 20:24:19 EDT 2014
>As I said before am waiting for the small spheres and will see what happens.
Monitor carefully, as I suspect the spheres will pack too tightly
leaving too little airspace. You could easily burn down an OCXO if
this proves to be the case and the oven control loop goes
unstable. I'd put a thermal sensor on the OCXO itself for testing.
Even if it doesn't burn down, you could find that the oven
performance is degraded by (i) instability or quasi-instability of
the oven controller, or (ii) too much thermal resistance (remember,
you want to add as little thermal resistance as possible).
On the other hand, mounting the OCXO as centrally as possible inside
the outer enclosure on thermally non-conducting standoffs (teflon or
nylon), with at least an inch of air on all six sides, has proven to
work extremely well.
When I described using packing peanuts (or similar) to break up the
airflow, it was in the context of having already mounted the OCXO as
centrally as possible inside the outer enclosure on thermally
non-conducting standoffs with at least an inch of air on all six
sides. And as I said, I have not found the additional step necessary
once you have done this. It may even be counterproductive.
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