Le 21/12/2011 10:53, Attila Kinali a écrit :
On Tue, 20 Dec 2011 13:12:13 +1100
Jim Palfreyman<[email protected]> wrote:
Why don't they build a watch that measures the temperature and every time
you accurately set it, it adds to a small database of time change v
temperature and then adjusts itself internally.
Over time it would become quite accurate I would think.
For some of the techniques of compensation and timepieces using them,
check out
http://forums.watchuseek.com/f9/thermocompensation-methods-movements-2087.htm
It's far more economic to put the watch into a climate chamber for half
a day and do one or two cycles trough the expected range. This gives you
much more accurate data and the watch can then do simple lookup in a table
instead of doing complicated calculations.
If you do the calibration right, you can quite easily get below 1ppm
(not accounting for aging).
Attila Kinali
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