[time-nuts] 53132A Polish UHS Time Base Option Interesting Ovservation
D W
watsondaniel3 at gmail.com
Tue May 12 15:49:55 UTC 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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