Volume Unit. VU meters which show how loud various signals are and measure the RMS value of the input voltage. For example, a sine wave that alternates between +1V and -1V will produce a reading on a voltmeter of 0.707V, the average of the voltage in DC. VU meters may be the speedometer type or electrical LEDs, and meter scales in dBindB. See also crest factorpeak, PPM.

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