[time-nuts] Another "atomic" clock question
hmurray at megapathdsl.net
Sat Mar 1 22:38:07 EST 2014
> I am trying to understand how this is done. Should I ever get a rubidium
> standard, I'd want to check its calibration, and that's not a trivial
If you assume your rubidium is stable, then it's pretty easy to check and/or
The trick is that you need someplace to stand. A PC running ntp is good long
term. There is a tradeoff between good and long. Good is ambiguous, but
both how-good is your PC clock and how good/accurate a measurement do you
want are appropriate.
Probably the simplest way is to get one of tvb's preprogrammed PICs.
One approach is to use a picDIV to make a PPS and then monitor that.
If you have Linux, you can feed the PPS to a serial port. My hack for
counting 60Hz will work fine at 1 Hz.
Another approach is to use a picPET and connect a modem control signal from
the monitoring PC to the Event input on the picPET. Then the data collection
program grabs the time, flaps a modem control signal, grabs the time again,
then grabs the text from the picPET and logs everything.
These are my opinions. I hate spam.
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