Hi Efratom became part of Datum a while ago. They changed the marking on the LPRO's after the ownership change.
Same product, just a new name on the door. Bob On Feb 9, 2010, at 7:28 AM, Joop wrote: >> It is best to leave your stable quartz and Rubidium oscillators >> running continuously, preferably on a UPS in case of power failure, >> for best results. >> >> Best regards, >> >> Charles >> > > I can understand. But I will not need that high accuracy very often. > So I just wanted to examine what can be expected after power-on. Just > saving a bit of environment where possible. > >> From a Datum LPRO specifications document I read: > > Warm-up: (at -20°C) (at 25°C) > Time to Lock: < 8.7 min < 5.4 min > Time to <1E-9: <10.2 min <7.3 min > Time to <4E-10: <12.7 min <10.6 min > > Frequency Retrace: <±2.5E-11 > (after 24 hrs power on @ 25°C & up to 48 hrs power off) > > I guess my readings are all within the above specs. The retrace value is > probably the limiting factor. 2.5E-11 translates in my setup to 90ns/hour. > Which looks being reached already in about 2 hours after power-on. So if > the Efratom is essentially the same as the Datum, then all looks fine. > > Joop > > > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
