>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.
