For mechanical watch movements such as Rolex
and Patek quality used a microphone to resolve
the sounds of the escapement reference. They
had a strip chart recorder on the top and displayed
the recovered acoustical signature onto a plot of
against the internal crystal reference which ran a
stepper motor moving the paper. I believe that the
manufacturer was Heuer. Last look was 20 yrs ago.
Same idea for 32k768 bender time references
different type of acoustical pickup then lots of
gain and a BP filter at 32k8.
No experience with newer 4M194 style watches.
Maybe build an RF induction pickup with a 4M2
filter and amplifier to try to find it then more
cleanup to get it to a counter
Greg
On 4/6/2011 5:32 AM, [email protected] wrote:
Dear Time-Nuts,
I am afraid of being off topic with the following.
If so, I sincerely apologize.
I would like to know the precision to be expected
on time keeping from a Tissot mod. J378/478 S wrist
watch and how could be verified the fulfilment of
that specification without waiting for a long time
(probably more than one month) to observe an error
of one second.
Instructions on how to build a test basket or similar
layout would be most appreciated.
Thanks in advance,
Antonio
CT1TE
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