[time-nuts] New precision watch

mike cook michael.cook at sfr.fr
Wed Dec 21 14:30:00 EST 2011


Le 21/12/2011 10:53, Attila Kinali a écrit :
> On Tue, 20 Dec 2011 13:12:13 +1100
> Jim Palfreyman<jim77742 at gmail.com>  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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