Re: Need casio service information




Seth Goodman wrote:

>Just out of curiosity, why isn't ntpd sufficient for your needs?

NTPD isn't very useful when the task at hand is doing an
independent test of NTPD to make sure that it is working
without gross errors.

If you are under the impression that such errors are rare, see
http://xenia.media.mit.edu/~nelson/research/ntp-survey99/
Which found that 3% of the NTP servers surveyed had offsets
of 128ms or greater, and some were off by many seconds!

John S. wrote:

>Guy Macon <http://www.guymacon.com/> wrote:
>
>> John S. wrote:
>>
>> >...would keep the watch well within useful accuracy...
>>
>> Not good enough for me. I use my watch as a time reference
>> to check NTP servers for gross errors, and I need it to be
>> accurate within a tenth of a second.
>
>Does it display to the tenth of a second? Most digitals display to the
>whole second only.

If you are looking at a digital display that changes once per second
and you hold your digital watch that changes once per second right
below it, you can see the error if one of them is a tenth of a second
off or more. Look at a spot between the two and your peripheral
vision sees them change at the same time. One can also set the
Casio alarm and compare the start of beeping to the display or
beep of the unit under test.

>Using the built-in timer would not be reliable because it really isn't
>possible to consistently hit that button and come up with the same
>number.

Also, it measures elapsed time, not absolute time. The stopwatch
on a Casio does have another use, though; wait until the top of the
hour and hit start right as you hear the hourly beep. From then on
the stopwatch will count up in synch with the man display - until
the next radio update. After that the stopwatch-to-main differene
tells you whether the watch is slow or fast; very convenient for
tweaking that adjustment pot.

--
Guy Macon <http://www.guymacon.com/>





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