[time-nuts] Logging the grid frequency....
Chris Albertson
albertson.chris at gmail.com
Fri Feb 22 12:03:52 EST 2013
People have measured AC mains period (and hence frequency) with very
simple devices. The best is just an AC plug-in power cube and a diode
to square the sine wave then this is connected directly to a DCD input
on a serial port. The Linix PPS driver will time tage each pulse with
a nanosecond timer that is good really only to about two microseconds.
This is better than good enough. All you need is a computer and a
few bucks worth of parts.
Here is one setup using DCD as the sensor
http://wwwhome.cs.utwente.nl/~ptdeboer/misc/mains.html
The newels PPS software will do the logging now. What you are left
with is a file that lists the time of each zero crossing. You get 60
new lines of text every second.
--
Chris Albertson
Redondo Beach, California
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