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Peak Program Meter (PPM)

Philips stand-alone PPM Meter

A Peak Program Monitor (PPM), sometimes referred to as a Peak Reading Meter (PRM), is an audio metering device. It's general function is similar to a VU meter but there are some important differences.

The rise time of a PPM (the time it takes to register the level of a sound) is much faster than a VU meter, typically 10 milliseconds compared to 300 milliseconds. This makes transient peaks easier to measure.

The fall time of a PPM (the time it takes the meter to return to a lower reading) is much slower.

PPM meters are very good for reading fast, transient sounds. This is especially useful in situations where pops and distortion are a problem.

See also: VU (volume unit) Meter