Hi If the time offset gets to the point that it bothers the measurement, you likely are running to low a difference frequency. It is quite possible (though not easy) to get low parts in 10^-13 running an offset of 8 or 9 Hz at 10 MHz.
If you are running very precise signals, then line stretchers can be used to get everything so it hits at the same point. There are NBS papers where they talk about doing exactly this sort of thing. Results were “within a couple of microseconds” as I recall. Bob > On Jan 17, 2018, at 1:44 AM, tim...@timeok.it wrote: > > > Hi Slawek, > I have tried two versions of DMTD and I think the biggest problem with this > method is the fact that two measures made on the same DUT never coincide. > The DMTD suffers from time wrap and the measurement results are linked to > the time difference presetted by t1 and t2. > At the moment I am using the TICC with good results, attached to the noise > floor. > I think that in order to have a better resolution we need to focus on a > recent production > error multiplier such as the A7 of Quartzlock or a similar one to be > self-constructing. > http://quartzlock.com/userfiles/downloads/manuals/A7-A_&_A7-MX_Manual.pdf > Luciano > www.timeok.it > > > Da "time-nuts" time-nuts-boun...@febo.com > A "time-nuts" time-nuts@febo.com > Cc > Data Tue, 16 Jan 2018 17:58:18 +0100 > Oggetto [time-nuts] Time interval measurement vs dual mixer method > > Hello to the group! > > Have you ever measured frequency standard (or other precision oscillator) > simultanously by time interval method (difference between 1 pps ref and 1 pps > DUT) and dual mixer method (e.q. with phase/frequency comparator)? I'm very > interested in results. > > Slawek > > > > > > _______________________________________________ > 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. > <TICC noise floor.tim>_______________________________________________ > 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.
