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, [email protected] wrote:
Message: 1
Date: Thu, 16 Dec 2010 09:53:23 +1100
From: Jim Palfreyman <[email protected]>
Subject: Re: [time-nuts] Adjusting accuracy of a Casio G-Shock watch
To: Discussion of precise time and frequency measurement
<[email protected]>
Message-ID:
<[email protected]>
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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