[time-nuts] Fwd: Dusty 53131A

Magnus Danielson magnus at rubidium.dyndns.org
Mon Mar 6 05:12:02 EST 2017


Hi,

To state the obvious, I think the same goes for 53132A and indeed 
several others.

Cheers,
Magnus

On 03/06/2017 08:19 AM, Bob Camp wrote:
> Hi
>
> 53131’s are dust magnets. It is not at all uncommon for them to fill up with dust,
> overheat, and die. Popping them open every 10 years or so to clean them out is
> well worth the effort.
>
> Bob
>
>> On Mar 5, 2017, at 8:54 PM, Scott Stobbe <scott.j.stobbe at gmail.com> wrote:
>>
>> Recently the fan in my 53131 has been making a pretty awful sound, so its
>> time to replace it. When I disassembled the counter I found the trim cap
>> had turned into a fur ball. Not that it really matters since it runs on an
>> external reference, but its interesting to see if the dust has any effect.
>> See https://www.flickr.com/photos/147407087@N06/32427230764/. So with the
>> unit disassembled I logged the effect of removing the dust by logging a
>> GPSDO during the cleaning process.
>>
>> Must of the dust was around the shroud of the trim cap. Near the mounting
>> terminals there was fairly minimal amounts of dust. At least in this
>> instance, if the dust had any impact on frequency, its orders of magnitude
>> below the thermal instability of the AT crystal.
>>
>> The crystal appears to be in a to-39 3-lead package. It is also
>> freestanding directly in front of the exhausting cooling fan...
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