"Richard B. Gilbert" <rgilber...@comcast.net> wrote in message
news:ojmdnuvxob4wkv7qnz2dnuvz_vydn...@giganews.com...
[]
Getting the time into the computer takes X microseconds where X depends
on the hardware and software. Windows' clock ticks every 17
milliseconds or something like that. Other operating systems also take
a toll!
Recent version of Windows tend to run at ~1KHz, and you can set that for
Windows XP as well.
If you *really* care about the nanoseconds, you don't feed them to the
computer! If you must, please don't step in what comes out the other
end! ;-)
Indeed! Windows with a serial PPS source can achieve offsets well under
250 microseconds - see:
http://www.satsignal.eu/mrtg/feenix_ntp_2.html
Ken is reporting offsets of nearly 5 milliseconds, so there's something
else going on. I wonder what the spec of that PPS signal is, and how all
the other stuff is multiplexed onto that cable? Worth a look with the
'scope, methinks.
Cheers,
David
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