Robert, Thanks that is really helpful. =Abhay
On Tue, Jun 1, 2010 at 7:48 PM, Robert Benward <rbenw...@verizon.net> wrote: > Abhay, > > The microprocessor "learns" the drift of the oscillator while it is > connected, so that when GPS is lost, it can make those corrections in > anticipation of drift. The longer it's locked to GPS, the better it learns > the drift (more history). Don't confuse the word drift with "locked", even > when locked, the oscillator is drifting and continuously being corrected. > These corrections (the voltage to the EFC or electronic frequency > correction) are an indication of the oscillator drift, even though the > output is exactly 10MHz. > > Others can provide links to useful articles. > > Bob > > > > ----- Original Message ----- From: "Abhay Parekh" <par...@berkeley.edu> > > To: "Discussion of precise time and frequency measurement" < > time-nuts@febo.com> > Sent: Tuesday, June 01, 2010 10:36 PM > Subject: [time-nuts] Training period for a Rb clock using GPS > > > Hello, >> I am a newbie at this, but have been playing around with 2 prs10s. >> For our application we need to run the clocks without gps, but we do get >> to >> sync it to gps *initially* for as long as we want. >> However, what we've noticed is that when we train it for short periods of >> time >> (< 1 hour a day) the clock drifts for a few microseconds a day once we've >> disconnected >> gps, but when we train it for say 12 hours, its drift seems to be much >> less >> (sub sub microsecond/day). >> We were wondering why this should be so! I apologize if this is obvious to >> most of you but >> I would greatly appreciate your help in shedding some light for us. >> Thanks! >> =Abhay >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.