App note on rms measurement

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Ex-Moderator
Joined 2003
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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