What does PM stand for?

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Pulse Modulated

Light sources that are pulsed (ON/OFF) at a high frequency by an oscillator circuit. The receiver of a pulse modulated photoelectric only receives light at that frequency, thus minimizing interference from ambient light. OR Modification of one or more of the characteristics of a pulse train used as a carrier.

Pulse Modulation

The use of a series of short pulses, which are modified by an input signal, to carry information

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