In the United States we can buy analog quarts watches from Wal-Mart for
under 15 dollars. When the battery dies you don't even bother to replace it
you just buy a new watch, unless...the one you have is very good. There is
a lot of variation and buying one is the luck of the draw. They can be as
bad as 1 minute a month and they always seem to be gaining. Right now I
have one that gains about 2 seconds a month. I fully intend to see if it is
possible to replace the battery when it runs down. Counting motor pulses
seems to be a little impractical because it would take 12 days to get to 1e6
accuracy.
Regards.
Max. K 4 O DS.
Email: m...@maxsmusicplace.com
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----- Original Message -----
From: "Tom Van Baak" <t...@leapsecond.com>
To: "Discussion of precise time and frequency measurement"
<time-nuts@febo.com>
Sent: Tuesday, April 15, 2014 8:52 AM
Subject: Re: [time-nuts] Measuring the accurcy of a wrist watch
Some research has shown that there is an comparable instrument for ANALOG
quarz watches. As far as I understand it does not try to detect the quarz
frequency but detects magnetic pulses from the step motors that move the
hands of the watch.
Has anyone of you ever tried to do this in a time nuts laboratory?
Ulrich,
Yes, this works well, for both those with seconds hands (one magnetic
pulse per second) and those with only minute/hour hands (one or two steps
per minute). A large coil of wire is all you need. Have a look at the
watch timing tools and sensors at http://www.bmumford.com/microset.html or
http://www.bmumford.com/mset/modelwatch1.html
Here's an example using a magnetic sensor:
http://leapsecond.com/pages/Junghans/
/tvb
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