Tom: I sense a nice experiment! Dry ice temps can be attained with
modest Dewars and thermoelectric fridge devices. PID controller and
bob's your uncle. Type K thermocouple modules on epay. With that
apparat, a nice set of adev vs temperature possible? Dry ice/acetone or
ethyl alcohol (everclear) slurry is often used as a calibration point
BTW. Liquid N2 may be too cold, or is it He I'm thinking of???
Don
On 2018-04-02 13:46, Tom Van Baak wrote:
Has anyone tried running a quartz oscillator at liquid nitrogen
temperatures: -196 C (-321F, 77K)? It's probably impractical
commercially, but maybe something of value to a time nut. Would that
dramatically lower temperature improve phase noise & short-term
performance? Is there a crystal cut that could be optimized for 77 K
instead of ~25 C (room) or 60 C (oven)?
If not Nitrogen, how about dry ice (-109F -78C)?
/tvb
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Dr. Don Latham
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