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Is the formula Peak to Peak voltage squared divided by 400 an accurate indicator of RF watts output? I have an accurate digital scope and want to calibrate an Elecraft W1 watt meter I just finished putting together. I have a QCX plus 5 for 40 meters, a QCX mini for 20 meters and a QDX rev4. I would like to know an accurate way to measure output. I also have the QRP Labs dummy load with the ground and RF taps that I use to measure peak to peak voltage. I believe using peak to peak voltage is an accurate method but wanted to make sure?
Thanks,
Glenn WA7SPY

I use the single-cycle RMS measurement feature in my Siglent scope to calculate the power =? Vrms^2 / 50.

If your scope doesn't measure Vrms, but does measure Vpp, then your formula of Vpp^2 / 400 is what you should use.

I prefer using the RMS measurement because Vpp is affected by noise and transients. The RMS measurement averages that stuff out.

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Dan? W6AZI