control knobs in electronic equipment, and rotating shafts in radar antennas.

An incremental encoder does not keep track of, nor do its outputs indicate the current encoder position; it only reports incremental changes in position. Consequently, to determine the encoder's position at any particular moment, it is necessary to provide external electronics which will "track" the position. This external circuitry, which is known as an incremental encoder interface, tracks position by counting incremental position changes.

As it receives

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