Ron D. wrote:
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TRMS meters generally have AC and AC+DC modes, but usually your interested in the AC portion.

** Not true.

The reason for needing a true RMS value is to predict heating in a resistance or maybe a fuse .
So you cannot omit the DC component.
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I'll bite.

** Don't bite off more than you can chew.

99% of what I did ..

** Totally irrelevant to the issue.

using an AC meter was measuring power supply ripple and abcense/presence of house AC or 24 VAC systems.

** Got SFA to do with needing true RMS values.

IF you need the true RMS value, the DC component must not be omitted.



...... Phil