[time-nuts] Tissot wrist watch

[Greg Broburg]

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, asmagal at fc.up.pt 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
>
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to 
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>