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
quietly...
73
Alex
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
compensation.
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:[email protected]] On Behalf Of Ron
Bean
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
conpensation".
https://en.wikipedia.org/wiki/Quartz_clock#Inhibition_compensation
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