A peak programme meter (PPM) is an instrument used in professional audio that indicates the level of an audio signal.

What is a PPM in audio?

A peak programme meter (PPM) is an instrument used in professional audio that indicates the level of an audio signal.

Is Vu and RMS the same?

A VU meter’s display is influenced by both the amplitude and duration of the applied signal. With a steady sine-wave signal applied to the input, a VU meter gives an accurate reading of the RMS (root-mean-square, or average) signal voltage.