Quote Originally Posted by yngndrw View Post
PWM:

wdrzal the only case when that is wrong is when using an in-line energy meter as the lower supply voltage may cause incorrect readings or no readings at all.

My orginal statement in above post is never wrong, If you using a inline meter that can't read the voltages & amps or wattage on the secondary side of your transformer for any reason......Get a meter that can.

Ps: you need test equiptment you trust that stays in calibration.