For digital clocks with analog hands, a 1sec pulse is easily detected by an electric guitar pick-up. The pulse is the one fed to the stepping motor. I noticed this while playing (I wear the watch on my right arm). Antonio I8IOV
>Da: [email protected] >Data: 19/04/2014 6.00 > >I have done that as well. The G-Shocks have a trimmer cap (I have a >DW-6900/module 3230). I don't remember the frequency at the adjustment >test point but it is something like 100 Hz. > >David > > >On 4/18/14 7:40 PM, Jim Palfreyman wrote: >> 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.
