[time-nuts] uC ADC resolution (was: Poor man's oven)
Richard (Rick) Karlquist
richard at karlquist.com
Sun Jun 11 13:48:56 EDT 2017
On 6/11/2017 6:09 AM, Magnus Danielson wrote:
> What papers would you recommend reading?
> One of the things that we experimented on and improved was the passive
> wall to prohibit quick cooling of oven. A puff of air or the forced
> convection (fans) needed for other electronics would tie the metal
> shield very well to surrounding environment. Using a simple plastic
> wall/box as a windshield has a quite drastic effect at the rate of
> change in temperature, and allowed the oven to react better to it.
> It has proven a very good strategy to reduce the systematic effect that
> eats up stability. As systematic effect, it should not be part of ADEV,
> but if you ADEV it is there loud and clear.
On the E1938A, we tried externally cooling it by spraying it with
canned "freeze mist" and there was no observable fluctuation in
crystal temperature using the crystal in B mode (20 ppm/degree C).
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