On 10/04/14 19:24, Richard (Rick) Karlquist wrote:
The trouble with ADEV is that if you average a long time it papers over anomalous events like crystal jumps.
ADEV is about characterizing noise powers. The better variants such as TOTADEV and TheoADEV will be even more efficient at suppressing a crystal jump. It's just not the right tool for crystal jumps.
An alternative measure might be to, instead of averaging, simply keep track of the worse case change in frequency during 1 sample period. Sort of like peak jitter versus rms jitter.
MAFE (Maximum Average Frequency Error) might be a suitable measure to apply, it's the frequency relative to MATIE (Maximum Average Time Interval Error).
MTIE (Maximum Time Interval Error) has been used for a long time characterize longer term systematics.
Maybe just doing a MFE (Maximum Frequency Error) might be the tool at hand. Just to get the ideas rolling. Cheers, Magnus _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
