Martyn, is there anything special about the design to which you might attribute the low drift? Even if your unit's siblings are not "quite as good", they might still be quite a bit better than the usual run-of-the-mill Rbs.
Thanks, Dana On Wed, Apr 8, 2020 at 8:46 AM <mar...@ptsyst.com> wrote: > Hi Guys, > > Just though you'd be interested in my prototype rubidium frequency standard > I made in the 1990's. > > http://www.ptsyst.com/RFS10-FrequencyDrift.pdf > > I have measured its frequency at random intervals for the past 18 years. > > Its never been adjusted and is just free running. > > It was turned off in 2005 and sent to a customer in Japan for a few weeks, > then returned and turned back on. > > For the past 18 years its stayed within plus/minus 3 x 10E-11. > > The overall linear drift is something like 1.85 x 10E-13 per month. > > This is not an advert. There's no way any of our production units are as > good as this one, well I assume so as I've never measured any for 18 years > continuous! > > Its now over 25 years old, have hardly ever been turned off. Any day I > expect it to fail, but it keeps on running!! > > Regards > > Martyn > > > _______________________________________________ > 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.
