[time-nuts] Z3805A cooling requirements?

Volker Esper ailer2 at t-online.de
Fri Dec 21 11:44:43 UTC 2012

Yes, I made such a setup, it's now running 22 hours. I'll post the 
results in two hours or so (if nothing evil happens to the earth, 


Am 21.12.2012 03:35, schrieb SAIDJACK at aol.com:
> Wish I had more time to play with this setup.
> How about fellow time nuts spend some time and present similar test data on
>   their OCXO's to compare?
> I was interested in the 1s to 100s ADEV, and my runs were from 8 minutes to
>   20 minutes, certainly enough time to capture data for 1s to 100s ADEV
> measurements..
> bye,
> Said
> In a message dated 12/20/2012 14:17:59 Pacific Standard Time,
> magnus at rubidium.dyndns.org writes:
> On  12/20/2012 01:34 PM, Bob Camp wrote:
>> Hi
>> Temperature  transients are not a good thing for an OCXO. If you
> deliberately use the fan  to create a transient, then yes the OCXO will not be
> happy. The question it -  what happens after the transient has settled out? The
> plot you have still  looks a lot like a step function.
> I agree. Temperature steps stresses  the OCXO oven loop and easily
> creates a gradient over the crystal. As the  oven loop tracks in, the
> frequency returns to around normal. The trouble  with forced air over a
> crystal is that the metal shield couples very well  and acts like a heat
> sink. A think plastic cover over it and forced  convection doesn't have
> the same effect. There is even being used by at  least one vendor. Works
> very well for the extra cents of manufacturing  cost.
> The HP10811 is recommended to be put in a airflow-quiet corner of  the
> world. Look at it's mounting in the HP5370A/B for  instance.
> Cheers,
> Magnus
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