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 <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
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