Re: [time-nuts] quartz clock/watch question
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: n1...@dartmouth.edu >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 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 >>> 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.
Re: [time-nuts] quartz clock/watch question
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 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 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. ___ 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.
Re: [time-nuts] quartz clock/watch question
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 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 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.
Re: [time-nuts] quartz clock/watch question
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 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 > 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.
Re: [time-nuts] quartz clock/watch question
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 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.
Re: [time-nuts] quartz clock/watch question
> 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] quartz clock/watch question
The short answer is the vast majority of watches have nothing done to them short of subtracting off a bias at a single temperature. More work is done for thermocompensated movements such as measuring offsets with temperature and creating digital counts tables. Ronald ___ 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] quartz clock/watch question
When a quartz watch or clock is assembled, what method is used to get it as accurate as possible? ___ 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.
