[time-nuts] Tissot wrist watch

[Greg Broburg]

Many moons ago I remember having discussions
about the performance of 32k768 benders. We
used them in pacemakers, mother natures 37.0
deg crystal ovens. For the watch chip designers
the temp curves were a part of their lives. The
daily usage was a part of the plan for where to set
the rock. The wrist temperature is a part of it and
the number of hours each day on the wrist. For
watches that sat unworn the times drifted a bunch.
I believe that that was the origin of the 4M194304
references which started showing up on the fancy
translate spensive, watches.

Imagine drift numbers for a watch sitting on a
dresser in an unheated cabin over winter months
and one closer to the Equator. Not an easy way
to compensate the drift without a temp tracker
and a varactor in the watch. I guess that that is
now old news.

Greg


On 4/6/2011 12:44 PM, Tom Van Baak wrote:
> Although we normally deal with nanoseconds and picoseconds
> here on this list, the essence of being a "time nut" and the allure
> of precision timekeeping is there in the micro- and milli-second
> world as well. I can personally tell you that the Allan deviation of
> a pendulum clock is equal or more interesting than an H-maser.
>
> As Bill just mentioned, for those of you interested in wristwatch
> or pendulum clock timing, please see Bryan's site:
> http://www.bmumford.com/microset.html
>
> Antonio, I used one of Bryan's Microset timers to measure my
> (WWVB radio controlled) wristwatch:
> http://www.leapsecond.com/pages/Junghans/
>
> There's no need to wait a month before you see a 1 second
> error! -- If you can measure to 1/10 second you only have
> to wait a few days, right?
>
> If you can measure to 1/1000 second you can see the error
> within an hour. If you use a Microset  measure to 1/1000000
> second you can time and rate errors within seconds or minutes!
>
> But at this level you will also be able to measure variations due
> to temperature or humidity or pressure or orientation, or phase
> of the moon, etc. You can monitor time, rate over time; rate drift
> over time; rate over shock, etc. The Microset is really nice.
>
> Note that just because your watch is accurate to 1 second a
> month does not mean it will be accurate to 12 second a year
> or 2 minutes a decade or 1/4 second a week or 1.4 ms an hour.
> The extreme non-linearity in performance is part of the great
> fun of analyzing the performance of any clock, in the short- and 
> long-term, from mechanical to quartz to atomic clocks.
>
> /tvb
>
>> 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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