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

Marv Gozum @ JHN marvin.gozum at jefferson.edu
Thu Dec 16 19:36:58 UTC 2010


I recall reading an article like this with a formal analyses of 
various quartz watches.  In this NIST worker's analysis, the Timex 
was most accurate.

http://tf.nist.gov/general/pdf/2276.pdf

The other article I read had a similar conclusion but was not as 
quantitative, and localized body heat caused by wearing it as large 
component of it inaccuracy.


At 09:25 PM 12/15/2010, time-nuts-request at febo.com wrote:
>Message: 1
>Date: Thu, 16 Dec 2010 09:53:23 +1100
>From: Jim Palfreyman <jim77742 at gmail.com>
>Subject: Re: [time-nuts] Adjusting accuracy of a Casio G-Shock watch
>To: Discussion of precise time and frequency measurement
>         <time-nuts at febo.com>
>Message-ID:
>         <AANLkTi=RC-K-oy9tE7--AGg10XMcgLvpgk-m6OQyS6p_ at mail.gmail.com>
>Content-Type: text/plain; charset=ISO-8859-1
>
>Hi Brooke,
>
>I've adjusted the watch as best I can within the limitations of the trimmer.
>The waveform was drifting 10 microseconds (slow) in about 20 seconds and so
>this should come out to 1 second in 23 days.
>
>I have now set the watch accurately and will follow it's progress. I plan to
>see how long it takes to be a second out and then re-open the cover and
>re-check the wave form.
>
> >From that I should be able to work out the relationship between the measured
>
>frequency and actual watch accuracy.
>
>Watch (*cough cough*) this space.

Best Wishes,


Marv Gozum
Philadelphia 




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