[time-nuts] Re: QM10 Quartz chronometer

[David G. McGaw]

But not in a chronometer.  They usually use something in the MHz range.

32kHz crystals are not very stable over temperature.  Watches rely on 
you wearing it for much of the day, keeping it at a nearly constant 
temperature and putting it on your bed stand at night, also presumably 
fairly constant.  Unfortunately they have been adopted for computer Real 
Time Clocks, which is why most computers do not keep very good time.

David N1HAC

On 11/26/21 9:14 AM, Scott McGrath wrote:
> Usually in analog quartz clocks oscillator frequency is around 32khz
>
> Content by Scott
> Typos by Siri
>
> On Nov 26, 2021, at 9:09 AM, Peter Torry via time-nuts <time-nuts at lists.febo.com> wrote:
>
> Hello list,
>
> I am restoring a Seiko Quartz QM10 Marine Chronometer that is currently inoperative. Preliminary investigations would indicate that the oscillator (TO5 header) isn't functioning therefore I am seeking any information as to its nominal frequency and whether it is just a crystal or an oscillator. I can follow the cmos dividers OK but a schematic diagram would be most useful.
>
> Any help or pointers much appreciated.
>
> Kind regards
>
> Peter   UK
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