Bob Camp wrote: > 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.
Actually, some cesium beam tubes are sensitive to acceleration because of beam ballistics. The 5071 CBT is specifically engineered to make this effect negligible. In Rb standards, inverting the clock might change the temperature distribution and affect the frequency that way (after a delay). Regarding relativity: the state of the art clocks at NIST supposedly are so precise that they could detect the relativistic shift between the 1st and 2nd floors of the building. Not that they fit in a elevator... Rick Karlquist N6RK _______________________________________________ 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.