Chris, Ok, one source is a PRS-10. Is it the DUT or the reference? And if it's the DUT, what is the reference source?
Dana On Tue, Jul 2, 2019 at 8:00 PM Chris Burford <cburfo...@austin.rr.com> wrote: > Hi Bob, > > I'm seeing 4.22E-12 as the slope value in the upper right of the TimeLab > phase difference plot. Is that telling me that my DUT is within +4.22ps > / sec from my reference 1PPS for the 24 hour measurement duration? > > I have attached a screen capture that will hopefully make its way > through for viewing. > > Thanks, > > Chris > > On 07/02/19 11:50:10, Bob kb8tq wrote: > > Hi > > > > The difference in seconds between the start phase and the end phase > divided by the number > > of seconds duration gives you the parts in whatever of the error. > > > > If you see 1us ( = 1x10^-6 seconds) of change in a second, you are off > by 1 ppm (or 1x10^-6). > > If you see 1 us of change in 1,000 seconds you are off by 1 ppb (or > 1x10^-9). At a bit over 10 > > days (1,000,000 seconds) your 1 us change is 1 ppt (or 1x10^-12). > > > > Bob > > > >> On Jul 2, 2019, at 10:17 AM, Chris Burford<cburfo...@austin.rr.com> > wrote: > >> > >> Is the slope value for the phase difference shown in TimeLab an average > of the overall data sample duration? The reason I ask is that my service > manual for my RFS says: > >> > >> /"//A faster way to make the comparison between the reference frequency > and the DUT is to use the time interval measurement mode of the counters. > In this case, the time intervals between the 10MHz zero crossings of the > reference frequency and the DUT are measured and averaged. If this time > interval changes by less than 10ps per second, then the DUT is within 1 > part in //10^11 of the frequency reference."/ > >> > >> I'm just curious if the phase difference slope value can be plugged in > to this equation. > >> > >> Regards, > >> > >> Chris > >> > >> > >> _______________________________________________ > >> time-nuts mailing list --time-nuts@lists.febo.com > >> To unsubscribe, go tohttp:// > lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > >> and follow the instructions there. > > _______________________________________________ > > time-nuts mailing list --time-nuts@lists.febo.com > > To unsubscribe, go tohttp:// > lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
