[time-nuts] hp10811 OCXO shipping jolt/drop survival?

Bruce Griffiths bruce.griffiths at xtra.co.nz
Sat Oct 10 07:52:45 UTC 2009


swingbyte wrote:
> Bruce Griffiths wrote:
>> swingbyte wrote:
>>  
>>> HI all ,
>>> I had a 5370 A shipped to me that suffered enough of a drop/roll to
>>> break a handle and bend the chassis such that the bottom panel had to
>>> be modified to get it back on.  When I connected the timebase output
>>> to the start input the frequency display is 10.0000000xx with the last
>>> two numbers moving about quite a lot.  Could this indicate damage to
>>> the oscillator due to the drop?  I haven't tuned up the inputs yet so
>>> this may be an artefact of that.
>>> Thanks
>>>
>>> Tim
>>>     
>>
>> Tim
>>
>> What gate time was used to measure the frequency?
>>
>> Bruce
>>
>>
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>>   
> Hi Bruce,
> With a 1s gate time it ranges from 9.999 999 996 to 10.000 000 012
> MHz  The 5335 with a 1s gate time gives 10.00000101 with the last
> digit flickering 0.   Of course what's really bad is I have two clocks
> to check now.  The std deviation  as measured by the 5370 of the 5370
> clock is ~1.8 kHz while the std dev of the 5335 clock is 7.8 kHz -
> both have 10811 OCXOs.. The 5335 measures the 5370 clock  std dev as
> 4.35mHz.  I think I'll have to check these against the Rb as I don't
> have a GPSDO yet.
> Thanks
>
> Tim
>
>
Tim

What was the gate time used for the STD deviation measurements?

Bruce




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