voltage of dimmer output not reading same on two different DVM's
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AHA, the keystone part of the puzzle. This blows Phil's statement out the water which is rare, there is no TRMS in DC.
** FYI:
" true RMS " = DC equivalent value for the *heating* effect on a resistance.
Repeating waveforms may have a DC offset = average DC value.
The "true RMS" value of such wave is:
sqrt ( DC ^2 + ACrms ^2 )
...... Phil
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