That's got to be a misprint, 40 seconds per day is > 400ppm error. I don't
think they even make 32kHz watch crystals that inaccurate any more. Maybe it
has a ceramic resonator instead of a crystal :-).

My guess is that it should be either 40 seconds per month if they are using
medium quality crystals (< 20ppm) or 40 seconds per year if they are using
the best crystals (< 2ppm).

Back in the late 70's early 80's when I started in the meteorological
instrument industry, clock movements with better than 2ppm accuracy (1
minute/year) were inexpensive and readily available from a number of German
manufacturers. Now those companies have all been bought out by Asian
manufacturers and the standard for clock movements is 20ppm (~ 1
minute/month).

Paul

> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Liam O'Hagan
> Sent: Wednesday, December 03, 2003 11:28 PM
>
>Off topic but interestingly, my brother in law just bought a
>rediculously expensive omega watch, somewhere around the $2.5k mark, and
>the instruction book (not just a little brochure mind you, but a hard
>cover bound volume) indicates that the expected accuracy is only +/- 40
>seconds a day or so...

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