[time-nuts] Z3805A cooling requirements?

Bob Camp lists at rtty.us
Thu Dec 20 12:34:25 UTC 2012


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.

On Dec 19, 2012, at 9:28 PM, SAIDJACK at aol.com wrote:

> Bob,
> I did the test with my 53132A as a fan blowing on the 10811 after removing  
> the shielding and letting it stabilize first. The rate of flow from the 
> counter  is actually not very strong, but the effects are massive.
> Attached are the results, and they speak for themselves. There is an ADEV  
> plot with the unit inside the foil insulation without airflow showing  a 
> very nice 1E-012 to 2E-012 stability all the way up to 100s, then  the ADEV 
> with airflow on the unit, as well as 10 minutes worth of frequency  plot while 
> inside the airflow. The ADEV is about 10x worse at around 100s and  pretty 
> much goes straight up at intervals greater than 2 seconds.
> This result is in line with our DOCXO oven tests we had done some years  
> ago. QED.
> bye,
> Said
> In a message dated 12/19/2012 16:48:44 Pacific Standard Time, lists at rtty.us 
> writes:
> Hi
> Ok, what happens if you keep the air gun in the exact  same position and 
> let it stabilize for an hour with no insulation around the  OCXO ?
> Bob
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