Well, so given the goal (stability at tau, for example) find the best measure and adjust rates (maybe they are not the same) given the oscillator-to-be-disciplined characteristics.
On Mon, May 7, 2012 at 11:44 PM, Magnus Danielson < mag...@rubidium.dyndns.org> wrote: > On 05/07/2012 10:59 PM, Azelio Boriani wrote: > >> Yes, interesting, now I realize... but: >> >>> the larger the deviation becomes and lower frequency it will have... and >>> >> both makes it>harder to suppress by filtering. >> > > Filtering at what level? Lengthen the sampling time? The average build up? >> That is, now I'm not aware and think that I have to correct as slowly as >> possible because I think that the oscillator has to be disturbed to a >> minimum. Then I see low frequency large deviations, so I think, OK, I have >> to average longer to account for. Is this the filtering you are referring >> to? So that one ends up increasing the slowness of the system getting only >> very slow frequency very large deviations. >> Thanks for the help >> > > If you have a little frequency error the longer you wait to do any > adjustment the larger phase-deviation that frequency error will result in. > If you sample to seldom, then you rely on your DAC resolution and stability > inbetween your samples, the clock will essentially be in hold-over. If this > is 1 ms, 1 s or 1000 s will make a difference. > > That relates to sampling rate, which puts a limit to the loop bandwidth > you can have. > > But my main reaction was to the sample-rate vs. measure and adjust rate > (i.e. sample rate), and I wanted to point out that there is a merit in > sampling (much) faster. The modulation waveform is only to illustrate the > averaging behaviour. > > 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. > _______________________________________________ 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.