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 _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
