[time-nuts] Line Voltage

Chris Albertson albertson.chris at gmail.com
Thu Jan 12 14:08:57 EST 2012

> Capturing the line as audio is on my list so I can investigate quirks in the
> 60 Hz clocking.  That same data should also shed some light in this area.
> (But it means the PC doing the collection has to be on the UPS.)

You don't need to use the audio interface to monitor frequency.  Use
the PPS interface.  it will time stamp each positive slope zero
crossing.  So you get 60 log file entries per second.   Sounds like a
lot but not really given the size of modern disks.   All you need in
terms of hardware is a 6V power cube and.  Plug it into pins 1 and 5
of a serial port.   Time stamps are uS level precision.

Chris Albertson
Redondo Beach, California

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