Doug says:

> There are many ways to measure AC voltages.  The most common is RMS
> which is the usual 220VAC (110VAC USA).  RSM voltage is litterally "Root
> Mean Square", so you square your readings, average them over one cycle,
> and take the square root.  It would help if you could sync your readings
> to the zero crossings of the power line.

Why would syncing to the line make any difference.  As long as he samples
one complete cycle why would it matter where he started and where he left
off?

michael

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