[time-nuts] Airflow around oscillators.
bill at iaxs.net
Sun May 22 15:58:25 EDT 2005
Lessee, that's about 5x10E-6, very good for temperature at ambient.
Some of the remaining 10E-6 or 8 is removed by oven control and the
rest by the insensitivity of the oscillator to temperature change.
What is the sensitivity of the oscillator element (not the ovenized
package) to temperature change? Put another way, how good is the
oven? What I'm really asking is, do I have to get an old refrigerator
for 10E-14 or have I got down in the noise where further temperature
control produces no improvement? For the PRS-10 and 10811, that is.
From: Poul-Henning Kamp
For the old fridge model there is a much easier way: Run water of
constant temperature through the in-side loop and control the temperature
of the water actively in both directions.
I heard about this setup from some professional metrology people who
have managed milli-kelvin stability that way.
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