Hi There are three things people refer to as G sensitivity on a crystal oscillator:
1) 2 g tip sensitivity (flip it 180 degrees on the bench). 2) Vibration sensitivity (vibration translates into phase noise) 3) Relativistic effects (take the oscillator to the moon and it's frequency changes). The first does not apply to an atomic clock. Since (unlike quartz) they are sensitive to magnetic field, they will change when you flip them around, but for other reasons. That would make actually proving a "no sensitivity" spec difficult. The second will not impact the atomic transition in an atomic clock directly. Since they have narrow loops in them, it will impact the quartz oscillators in the atomic clock. You will indeed see vibration translate into phase noise at a ~ 2x10^-9/g sort of rate. The third does indeed apply to atomic clocks. Change the gravity and time changes. Change time and there goes frequency. This is a very real part of the spec process on space flight atomic clocks. I've never seen it worried about on crystal oscillators for space applications. Bob -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Tuesday, January 11, 2011 8:49 AM To: [email protected] Subject: [time-nuts] Sensitivity to g in atomic clocks While sensitivity to g is an usually specified parameter for crystal oscillators, I've been unable to find any indications for atomic clocks, say 5071A, or more modestly LPRO. Can anybody point me to any source of info on the subject? Thanks, Antonio I8IOV _______________________________________________ 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.
