[time-nuts] 53132A Polish UHS Time Base Option Interesting Ovservation

D W watsondaniel3 at gmail.com
Tue May 12 11:49:55 EDT 2015


And this is where one question leads to another. For an oscillator that is going to be used at very high velocities and accelerations, like in a missile, would it be calibrated somehow under the target G force? Or would you just compensate some other way? Or just not worry about it?

Dan

> On May 12, 2015, at 6:51 AM, Bob Camp <kb8tq at n1k.org> wrote:
> 
> Hi
> 
> All  OCXO’s are sensitive to acceleration. Gravity is one form of acceleration. A
> sensitivity in the 0.5 to 2 ppb / G is not uncommon. 
> 
> Bob
> 
>> On May 11, 2015, at 9:24 PM, J. L. Trantham <jltran at att.net> wrote:
>> 
>> I recently obtained a 53132A and added the HP Opt 010 High Stability Time
>> Base option with a 10811 variant OCXO.
>> 
>> 
>> 
>> I left it on for over a week and it, ultimately, seemed to slow down in its
>> drift, with the displayed frequency, as it 'read' my GPSDO, slowly
>> decreasing, suggesting that the Time Base was, slowly, increasing in
>> frequency.
>> 
>> 
>> 
>> I then removed the HP option and installed a Polish UHS Time Base option
>> with a Morion DOCXO.  After about 72 hours, it seemed to stabilize.  I then
>> 'calibrated' the 53132A by connecting my GPSDO to Channel 1.  The displayed
>> frequency was +/- 1 to 2 mHz of 10.000 000 000 MHz for the past week or so,
>> with no drift noticeable.
>> 
>> 
>> 
>> I had 'calibrated' the 53132A with it sitting at about +30 degrees, propped
>> up on its 'handle' in a 'vertical' position.  I then had occasion to move
>> the 'handle' under the unit whereby the unit was 'flat', at which point the
>> displayed frequency dropped to 9.999 999 997 MHz, +/- 1 to 2 mHz.  The
>> displayed frequency was the same this evening when I came home.  When I
>> again 'elevated' the unit by moving the handle to its more 'vertical'
>> position, the displayed frequency moved to 10.000 000 000 MHz +/- 1 to 2
>> mHz.
>> 
>> 
>> 
>> I'm not sure what this means.  
>> 
>> 
>> 
>> It is a 'repeatable' observation.  It displayed the lower frequency all day
>> and when I 'elevated' the 53132A this evening, the frequency again went to
>> 10.000 000 000 Mhz.  Is this a 'gravity' effect?  Is this an issue with the
>> DOCXO?  Is this an issue with the 53132A?  If I am correct in my
>> calculations, the displayed frequency is +/- 1 to 2 parts in 10E-10 of 10
>> MHz, assuming my GPSDO is accurate and stable.  Otherwise, the GPSDO and
>> 53132A 'drift' is exactly the same.
>> 
>> 
>> 
>> I would appreciate anyone's thoughts regarding this analysis and observation
>> and how to go about 'quantifying' it in a more scientific method, assuming
>> it's worth pursuing.
>> 
>> 
>> 
>> Thanks in advance.
>> 
>> 
>> 
>> Joe
>> 
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