Does anyone manufacture a quartz watch in which the speed can be adjusted?

# Thread: Does anyone manufacture a quartz watch in which the speed can be adjusted?

1. ## Does anyone manufacture a quartz watch in which the speed can be adjusted?

Does anyone manufacture a quartz watch in which the speed can be adjusted?

I have \$11 Casio digital watch which I have observed weekly for the past three months. I then ran the 12 observations through a linear regression which showed that the watch gained four seconds every week. While the watch is now 53 seconds in error, the error is extremely consistent. If I could get the watch to pause for 24 milliseconds every hour, all 12 observations would have been within one second of the correct time. (Note: 11 of the 12 observations would have been within one quarter second of the correct time, so it may have been the observation itself that was in error.)

2. ## Re: Does anyone manufacture a quartz watch in which the speed can be adjusted?

What do you mean by "speed" ? The frequency of the crystal cannot be changed because it is a resonance frequency that depends on the shape of the crystal and the electronic components of the circuit (and also the temperature of the watch). The only thing that could be adjusted is the count of the cycles needed to make a second. A "standard" quartz is built with a resonance frequency of 32768 Hz so you can count 32768 cycles to make a second. You can change this constant adding or subtracting 1 or more virtual cycles to speed up or slow down the rate. Now the problem is that very few watches give the final user the possibility to change the rate and the more recent the watch is the less you have a chance to get it. Seiko 9F calibers (which is anyway already thermocompensated that is it has already a self correction algorythm based on the temperature) has a trimmer that is user adjustable. Old Longines VHP (also thermocompensated) had such a trimmer. 30 or 40 years ago it was a lot more common to put a trimmer inside the movement but honestly nowadays I don't remember a recent watch with a trimmer (or a similar device) to give the user the possibility to adjust the rate. A lot of modern calibers have a digital interface that can be used to do a lot of things but the use of this interface is mainly restricted to the manufacturer...

3. ## Does anyone manufacture a quartz watch in which the speed can be adjusted?

I know some Casio digitals have a trimmer.

https://forums.watchuseek.com/f43/ho...#/topics/83153

And there are a bunch of open source platforms for Suunto watches. I’m not sure if any give you control of the timing of the watch, though.

https://forums.watchuseek.com/f374/s...topics/1359050

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5. ## Re: Does anyone manufacture a quartz watch in which the speed can be adjusted?

Originally Posted by dicioccio
What do you mean by "speed" ? The frequency of the crystal cannot be changed because it is a resonance frequency that depends on the shape of the crystal and the electronic components of the circuit (and also the temperature of the watch). The only thing that could be adjusted is the count of the cycles needed to make a second.
Actually by using a capacitance trimmer it is possible to 'pull' the frequency of a crystal oscillator slightly and thus regulate a reference frequency. I have an old casio with a screw trimmer which I assume is turning a small variable capacitor. Whether a digital watch uses a capacitor trimmer or a digital approach (e.g. counters and clock pulse inhibit) or has no service adjustment provision at all is down to individual implementation. Some casio g-shock models have trimmer screws accessible when you take the case back off, others do not.

6. ## Re: Does anyone manufacture a quartz watch in which the speed can be adjusted?

The Russians have been producing cheap, Casioesque watches with digital rate trimmers accessible via an on-screen menu since the Soviet era.

My Elektronika 53 is currently trimmed to near enough +/-0.0 seconds per day (unworn).

The Elektronika 53 is shown, here, on a Casio bracelet.

7. ## Re: Does anyone manufacture a quartz watch in which the speed can be adjusted?

^ That is wickedly cool!

8. ## Re: Does anyone manufacture a quartz watch in which the speed can be adjusted?

Originally Posted by brandon\
^ That is wickedly cool!

9. ## Re: Does anyone manufacture a quartz watch in which the speed can be adjusted?

Originally Posted by Tom-HK
That is why you specified UNWORN hahahaha !!!

10. ## Re: Does anyone manufacture a quartz watch in which the speed can be adjusted?

Originally Posted by dicioccio
That is why you specified UNWORN hahahaha !!!
To quote Homer Simpson: it's funny because it's true.

11. ## Re: Does anyone manufacture a quartz watch in which the speed can be adjusted?

Originally Posted by Tom-HK
The Russians have been producing cheap, Casioesque watches with digital rate trimmers accessible via an on-screen menu since the Soviet era.

My Elektronika 53 is currently trimmed to near enough +/-0.0 seconds per day (unworn).

The Elektronika 53 is shown, here, on a Casio bracelet.
Tom what module is in that one. Have to look mine up.

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