[ntp:questions] Jitter versus polling interval

Danny Mayer mayer at ntp.org
Tue Mar 10 03:12:34 UTC 2009

David J Taylor wrote:
> David Woolley wrote:
>> Danny Mayer wrote:
>>> Increased polling frequency increases jitter.
>> I think jitter was being used loosely here, not with the specific
>> sense of high frequency variations.
> Yes, my original question referred to looking at a graph of offset plotted 
> over a day (sampling at 5-minute intervals) and trying to judge the amount 
> of short-term oscillation as opposed to the longer-term drifts (e.g. those 
> caused by temperature variations). 

Perform a FFT (Fast Fourier Transform) on the data and look for the peaks.


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