Hi We used to do it with a microphone. Nothing fancy, just a simple little guy with the inductance resonated out at 32 KHz. The output feed a computing counter. It worked fine as long as the microphone was in contact with the watch or watch module.
Bob On Apr 18, 2014, at 7:25 PM, Bob Albert <bob91...@yahoo.com> 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 <t...@leapsecond.com> 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 -- 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.
