PMA-NC252MP power amplifier

[pma]

The above post looks like a good joke, right? It is and it is not. The precise and calibrated wideband DMM happily measures the class D ultrasonic rubbish and garbage and increases amplifier output voltage by the amount that is out of the audio band. So, for a precise audio rms measurement, it needs a LPF filter, though it measures perfect true rms.

 

[SIY]

This thing that is supposed to be slow measures with a good fidelity the switching frequency and its rms voltage value.

At what it costs, it ought to be accurate! Of course, I can do the same thing with my $35 handheld scope-generator...

 

[miero]

Yes, level matching of multiple amplifiers is not straightforward when a Class D amplifier is involved.

 

[Sokel]

At what it costs, it ought to be accurate! Of course, I can do the same thing with my $35 handheld scope-generator...

At this price range and a little higher I don't think we can expect great accuracy and freq range.
That's mine for example:

(link)

True RMS only up to 1000Hz and with a meh accuracy.
I want a big Keysight!