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Here is a YouTube video on how to do it. THD

Original post updated with waveform pics and THD for all generators with 3 KW load.

I re-ran the generators all with 3 Kw loads. I'll update the first post with the pics at 3 Kw and THD values at 3 Kw for each. Time for a 🍻

Used the scope to do an FFT on the waveforms, measured the amplitude difference between the fundamental frequency and the harmonics. Then run that thru a spreadsheet to calculate THD.

I'm redoing that test. Will revise original post when I can today.

Added to the original post

In another thread people were interested in how clean the AC output was from various generators as compared to utility power. Below is a compilation of various AC power source waveforms and Total Harmonic Distortion (THD) calculation results. Function generator set at 60 Hz. "Ideal" AC...