[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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