[time-nuts] Measuring the accurcy of a wrist watch
max at maxsmusicplace.com
Tue Apr 15 15:39:53 UTC 2014
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
Max. K 4 O DS.
Email: max at maxsmusicplace.com
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----- Original Message -----
From: "Tom Van Baak" <tvb at LeapSecond.com>
To: "Discussion of precise time and frequency measurement"
<time-nuts at 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?
> 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
> Here's an example using a magnetic sensor:
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