Never get caught short not knowing the equivalent voltage, power or dBm given a value in any other unit. Quickly display Vpeak, Vpeak-to-peak, Vrms, Power in Watts and dBm (0dBm = 1mW) given the value of any one of these parameters. VU and audio mode enables this functionality for
600 ohm audio line levels.
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Allen W. suggested a great addition: Volume Units or VU. So the calculator now has two modes: RF (50 ohm impedance) and Audio (600 ohm impedance), VU is only defined for audio line-level signals into a 600 ohm load.