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diyAudio Moderator Emeritus
Join Date: Jan 2003
Location: Near London. UK
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Yes, it's quite a nice tutorial.
More significantly. we should ask, "When do I actually need to measure true RMS?" I have a couple of true-RMS DMMs (chosen for their accuracy - true RMS was incidental), and the only time I have needed the true-RMS facility was when measuring valve heater voltages.
It's quite unusual to need true-RMS in audio (although THD+N is usually measured with an RMS rectifier).
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The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...
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App note on rms measurement
