Steve Nosko wrote:
"I wonder if a "true RMS" DVM can handle this?"

So do I. The true rms meter seems a wonderful development to me.

Steve also wrote:

"Also ok, but not sure how it plays into the RMS discussion."

My speculation is that the effective value of a nonsinusoidal waveform
could be found by summation of its sinusoidal constituents.

But, it`s not difficult to find an effective value for not only
sinusoidal periodic waveforms but for
nonsinusoidal periodic waveforms as well. One can graphically take a
large number of equally spaced ordinates of the form, using at least one
complete alternation, Richard Clark. Both alternations are not needed
but could be used as a minus times a minus is a plus and each of the
ordinate values must be squared because power is a function of the
current squared, so both alternations when their ordinates are squared
produce positive values. Next, we sum the squared ordinate values and
divide by the number of ordinates. You get the average value of the
squared curve which is what we are looking for.

Or, you can construct the squared curve and integrate the area under the
squared curve by using a planimeter. Dividing the area by the baseline
length gives the same average value of the squared curve as iusing the
graphic ordinates above. Voila: rms.

Unless I`ve opened a new can of worms with this posting, I don`t know of
any difference of opinion I have with Steve.

Best regards, Richard Harrison, KB5WZI