[time-nuts] Casio Wave Ceptor wrist watch - quick accuracy test

Dana Whitlow k8yumdoober at gmail.com
Mon Jun 11 06:30:20 EDT 2018


I bought a Casio 'atomic watch" about 3 months ago, one which uses the
'3405' module.
I've also been running checks with radio setting turned off, and mine is
coming in at
just under 1 sec per month, based on seeing how long it takes to drift one
second.

But I find that visual/aural coordination is a poor way to do business- if
the error is near
zero (or an integer number of seconds), my eye/ear/brain will shift to make
it look like
it's "right on" within a few seconds even if the initial look says it's a
little bit off.

I hadn't thought of the video approach- sure wish I had a means to record
video and
then view it frame by frame.

Dana


On Mon, Jun 11, 2018 at 3:20 AM, Esa Heikkinen <tn1ajb at nic.fi> wrote:

> Hi!
>
> There seems to be some kind of comeback going on with 80's style digital
> watches. You may find replicas of some 80's models or even re-makes of the
> original models from original manufacturer.
>
> So I decided to get one. As a time-nut my primary goal was to have radio
> controlled 'atomic' model. So I ended up to Casio Wave Ceptor
> WV-59DE-1AVEF. There's many models available from basic digital models like
> this to very nice ones with with full titanium body (analog style). But
> because of the 80's is hot it had to be digital...
>
> Wave Ceptors suport all time signals formats (US, UK/German and Japan) and
> correct standard is automatically selected when home city is set.
>
> One of the first things to do was to test the accuracy with radio
> syncronization turned off. Correct time was fist set with DCF77. Then I
> switched off the synconization. After beign about three days off there was
> no significiant visible error on time. In the video we can see however
> about one frame error, which means about 40 milliseconds. Still that's
> pretty good result for wrist watch. Also, the syncronization will occur
> once per day when the reception is good.
>
> So the watch must be at least calibrated in the factory. Don't know if the
> watch performs any kind of self-calibration according to radio
> syncronization results, most likely not - but it would be technically
> possible.
>
> So far so good, it's accurate enough - at least as new. When
> syncronization is turned on, there should never be visible error on time.
>
> Here's my test video:
> https://www.youtube.com/watch?v=_A23buFeHd0
>
> --
> 73s!
> Esa
> OH4KJU
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