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NEMA 4/ UL Type 4

A standard from the National Electrical Manufacturers Association, which defines enclosures, intended for indoor or outdoor use primarily to provide a degree of protection against windblown dust and rain, splashing water, and hose-directed water.

Noise

An unwanted electrical interference on the signal wires.

Null

A condition, such as balance, which results in a minimum absolute value of output.

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