> 1) In an unconditioned/semi-conditioned space.   The ambient temperature can
> slew 20*C easily over the holdover period.   (Think sun hitting an outdoor
> enclosure first thing in the morning - the ambient temperature tends to rise
> quickly). 

It would be interesting to get some data on that.  Clouds blocking the sun or 
holes in the cloud cover would be a variation.

If the sun hits the enclosure, how long does it take the air inside to heat up 
and then how long does it take the gear inside to warm up?

One of the classic tools for problems like this is to attach a big blob of 
stuff to the crystal to dampen thermal changes.  When you design your test 
setup, can you leave room for a brick and collect data with and without when 
you toss it into the freezer?

-- 
These are my opinions.  I hate spam.




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