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.