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

[Brooke Clarke]

Hi Jim:

It may not be a good idea to adjust the watch so that the frequency is 
spot on at the time the adjustment is made.
A better idea may be to wear the watch for a week and note the 
fractional time error then adjust the frequency so the offset matches 
the error.

Have Fun,

Brooke Clarke
http://www.PRC68.com


Jim Palfreyman wrote:
> Fellow time-nuts.
>
> Over in another part of the internet is a group of people who love their
> Casio G-Shock watches. These digital watches have been around for decades
> and are built very well.
>
> The one I own is an "atomic" and solar model (i.e. no battery replacement).
> However being in Tasmania, I cannot receive the low frequency time signals.
> When I first received the watch it's accuracy was excellent. Under 10
> seconds a year. I even posted on here about it. Since then though it has
> drifted somewhat.
>
> After a ton of internet searching on how to open the case and how to adjust
> these watches (this is non trivial as the models are all very different and
> no instructions existed for this model - the GW-810D) I have finally cracked
> it.
>
> 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.
>
> Over in mygshock.com they struggle with this sort of timing stuff - whereas
> my big deal was opening the case!
>
> Just posting in this in case anyone here is interesting in adjusting their
> G-Shock.
>
> Jim
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