Jon Elson wrote:

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These dimmers MUST be pulse width modulated, othwerwise the heat
production would be huge.
You can't expect a DVM to give accurate reading of a
pulsating source.


** Still can certainly show the average DC voltage.

The usual input RC network doe the job nicely.


Possibly some true-RMS meters may do a decent job of
averaging the result,

** Only if the have response down to DC and up to the high harmonics of the PWM.

..... Phil