[time-nuts] Z3805A cooling requirements?
Bob Camp
lists at rtty.us
Thu Dec 20 12:34:25 UTC 2012
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.
Bob
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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