[ntp:questions] Sine wave offset patterns

unruh unruh at invalid.ca
Tue Sep 10 00:34:42 UTC 2013


On 2013-09-09, E-Mail Sent to this address will be added to the BlackLists <Null at BlackList.Anitech-Systems.invalid> wrote:
> Jared Watkins wrote:
>> ...
>> In pretty much all cases though when graphing the offsets
>>   I'm seeing sine wave patterns.
>>  The period is usually about 10 hours and the amplitude
>>   can vary by +-25ms for the 'closer' ones and as much
>>    as +-100ms for the more distant ones.
>> ...
>> Any ideas on what would cause it?
>
> Temperature?

That should not cause millisecond changes. Temp will change the PPM but
maybe 1PPM and if it really really bad, by 10PPM. 
But 10PPm over 10 hours is only about 30ms. And closer and more distant
really makes little sense. 
>
>



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