[time-nuts] Measuring the accurcy of a wrist watch

Chuck Harris cfharris at erols.com
Tue Apr 15 16:26:50 UTC 2014

You don't count the pulses, you measure the separation between the pulses.
Just like with the 1PPS output on your C-Beam.

-Chuck Harris

Max Robinson wrote:
> 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.

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