It sounds like once in awhile your sampling something else too. Ground bounce of a 10 MHz buffer, or something coupling onto your phase detector, or running your adc at the edge of a timing spec?
How large would the outlier be in mV? On Wednesday, 5 October 2016, Nick Sayer via time-nuts <time-nuts@febo.com> wrote: > This is tangentially on topic, I suppose. It’s for my GPSDO. > > I notice periodically that the phase measurements seem “noisy.” You can > see that over the course of several seconds the value doesn’t change, then > it jumps a bunch and then comes right back. > > My theory at the moment is that sampling the ADC multiple times in a row > might help, but then what’s the best way to (quickly) pick which sample to > use? > > The mean would allow a bad sample undue influence. > > At the moment, I’ve coded taking 3 samples, averaging them and picking the > sample that is closest to the mean. If I’m right, and two of the samples > happen to be very close to each other and a third is an outlier, then that > seems like it would eliminate it. > > I guess what I want is the mode, but with 3 samples, that’s going to be > poorly defined (if at all). > > Anyone have any suggestions (besides a larger sample size)? > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com <javascript:;> > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ 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.