I've opened up my Casio G-Shock watch, found an electrical point, put an oscilloscope on it and successfully adjusted it. From memory the frequency was something weird, but I still tuned it successfully to within about a second a month. I even think I posted to time-nuts on this...
Jim Palfreyman On 19 April 2014 09:25, Bob Albert <[email protected]> wrote: > I have tried to pick up the oscillator from my wristwatch and have been > unsuccessful. > > > I tried both magnetic and electric probes. Nothing. > > Bob > > On Friday, April 18, 2014 4:12 PM, Tom Van Baak <[email protected]> > wrote: > > > When a quartz watch or clock is assembled, what method is used to get it > as accurate as possible? > > Bob, > > First generation quartz watches had a tiny F/S (fast/slow) trimmer > capacitor. These days it's done with skip cycles and one-time factory > calibration. Think leap days or leap seconds -- it's easier and more > reliable than changing the frequency of the oscillator itself. It's also > one less part, easier to calibrate, and unlike active and passive > components, math has no environmental sensitivity. > > Have a quick read of 32 kHz watch IC's like: > http://www.nxp.com/documents/data_sheet/PCA2000_2001.pdf > > /tvb > > > _______________________________________________ > 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. > _______________________________________________ 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.
