[time-nuts] Car Clock drift - the lowly 32kHz tuning fork crystal specs
alex at pcscons.com
Sun Apr 9 22:01:05 EDT 2017
actually it does not compensate for temperature it is just for reduce
the production cost for the crystal. We --Jean Hoerni [founder of
intersil, Eurosil and one of the traitors who started Fairchild
Semiconductor] and me -- made something very similar at the time of
begin of the quartz clock era for Lipp a French watch maker in Bezancon
[a city an France the spelling is most likely not correct]. The company
exhibited it at the Basler exhibition of Horology, the clock was simple
good working and not to expensive, Ebachos --OMEGA -- people visited the
booth, they also had their quartz clock which was much more expensive
-- they looked, the Lipp clock and told na there are Rolls-Royce s and
deux chevaux [that was a simple little ugly but very reliably French car
] as response Mr. Hoerni told them yes, and there are technologies not
known in your house, the Omega people recognized him and walked away
On 4/9/2017 1:11 PM, Bill Hawkins wrote:
> Nice article in Wikipedia. Didn't see any familiar names in the
> reference list, though.
> Seems to me inhibition compensation is useful for compensating for the
> variation in purchased crystal frequencies, but not for temperature
> Also seems to me that a watch spends 2/3 of a day at wrist temperature
> and 1/3 at bedroom temperature, which varies with the seasons.
> Would a ceramic capacitor crafted for a certain temperature coefficient
> work? Can the fork have a crafted tempco?
> Bill Hawkins
> -----Original Message-----
> From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of Ron
> Sent: Sunday, April 09, 2017 12:05 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Car Clock drift - the lowly 32kHz tuning fork
> crystal specs
>> In your case, the car sits in an environment that matches their test
>> setup well. In my case ?\200? not so much.
> FWIW, mine drifts pretty badly. It's in an aftermarket stereo, and I
> don't remember when I bought it (I moved it from my previous car).
> I assume that all quartz clocks and watches these days use "inhibition
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