Do what the high power radio guys used to do: put a load resistor into a can of oil. Drive it with the output signal and the measure the temperature rise of the can of oil. This is probably best done by doing a "ballistic" test - insulate the oil can, measure its initial temperature, run the driving signal for a time much shorter than the thermal time constant of the oil can, then measure the final/peak temperature of the oil. A little computation gives the delta-T for the number of watt-seconds that were dumped into the oil.
I'm all up on the calculation methods, use them all the time. But in the end power is about energy delivered to a load.
I'm all up on the calculation methods, use them all the time. But in the end power is about energy delivered to a load.
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