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

Glenn Little WB4UIV glennmaillist at bellsouth.net
Sat Oct 10 14:18:53 UTC 2009


A 4.35 milli-Hertz(mHz)deviation is not bad at all. If you meant 4.35 
Mega-Hertz (MHz). There are a few orders of magnitude between these 
(10^-3 to 10^6).
The proper use of units is important. In some cases this improper use 
of units can be understood due to the wrong units cannot apply. In 
this case the possible wrong units could apply, so, you need to use 
the correct units so that there is no misunderstanding.

Did you mean mHz or MHz??



73
Glenn
WB4UIV

At 03:21 AM 10/10/2009, you 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
>
>
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