On 4/6/2011 10:33 AM, Greg Broburg wrote:
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.
An excellent reference timer is the MicroSet made by Bryan Mumford.
It will do exactly what you want and even has an available GPS
reference if you need the accuracy. I've used one for quite a few
years and have no connection with Mumford except as a customer.
Bill S
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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