just open the box, look for the wires which going to the magnet which
drives the minute hand and measure the period time -- not the frequency,
it is to low
yes analog quarz clock slows down as the battery get old, you will be
surprised, that the driver pulse's period time dos not change, but
sometimes the divider chain or the mechanic skips a pulse, as the
battery voltage drops further suddenly the clock mechanic or the
electronic will stop working, takes less current so the battery recovers
a bit, because the magnet did not used power for a while, and will run
again for a while, the pause between two run time will be larger and
larger so the clock looks like going slower
73
Alex
On 9/12/2014 3:52 PM, Dr. David Kirkby (Kirkby Microwave Ltd) wrote:
Dr David Kirkby
Managing Director
Kirkby Microwave Ltd
Registered office: Stokes Hall Lodge, Burnham Rd, Chelmsford, Essex, CM3
6DT, United Kingdom
Registered in England and Wales as company number 08914892
http://www.kirkbymicrowave.co.uk/
Tel 07910 441670 / +44 7910 441670 (0900-2100 GMT)
On 12 Sep 2014 12:18, "Bob Camp" <kb...@n1k.org> wrote:
Hi
Hi,
If this is an RTC, it’s probably running off of a battery when the
machine is powered down. It is far more likely that the oscillator is
dropping out (stopping) rather than shifting frequency.
Good point, I never thought of that. I have however noticed that analogue
quartz clocks slow as the battery goes flat. But maybe too they stop and
start. It would make an interesting experiment to check it, but one would
need some method of logging the time from the hands. Conceptually that is
not difficult, but it needs more work than I want to do. One could do it
with a video camera and a fair bit of work writing the software. Probably
easier is logging battery voltage and current as that should show if it
starts and stops.
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