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John mentioned he tried this out with
a "Fluke AC true-RMS measuring DVM". I would have thought that
the "AC true RMS value" of a DC 1.6 volt signal was 1.6 volts.
i.e. sqrt(1.6^2) = 1.6
...or perhaps it's true RMS of each polarity, hence
sqrt[(1.6^2 + 0^2)/2] = 1.131
How can the True RMS value of a DC signal be zero, I wonder?
I tried this check on two DVMs, first the Radio Shack 22-188,
then an el cheapo $10 special, "M-830B".
RS on DC 1.592 volts (Rayovac alkaline cell)
M-803B on DC 1.603 volts
RS on AC 1.2 first sample, then decreasing,
either polarity on 2 V AC autorange.
M-803B on AC 2.8 volts constant for one polarity,
0.0 volts for the other, 200 V AC range.
I don't think anybody suggests either of these is
AC true RMS reading, for sure!