[time-nuts] Adjusting accuracy of a Casio G-Shock watch

[Hal Murray]

> Interestingly, the module has a pad that gives off a stepped square wave at
> 32768/48 Hz. So with well calibrated equipment (which we all have of course)
> it is trivial to adjust the trimmer to put the watch back to decent
> accuracy. Using the smallest adjustment of the trimmer that I could muster I
> could get it down to about 0.5 in 10^6 or 1 second in around 20 days. Not as
> good as when I got it - but I was probably just lucky. 

A while ago, there was either a story here or a URL that eventually led to 
the story about how to set a mechanical watch.  The problem is that it varies 
slightly depending upon temperature and orientation and ....

The recipe was roughtly:
  Record the time offset and time.
  Wear it "normally" for a week or two.
  Record the new time offset and time.
  That lets you calculate the frequency offset.
  Now, take it apart so you can adjust it,
  Measure the current frequency.
  Calculate the target frequency of current-offset.
  Adjust to the target frequency.


-- 
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