Think about that 1000 Hz tone that’s used as a standard for the VU meter spec. If you have an audio oscillator set to 1 kHz and turn it ... but it’s clear that both meters have their place.

A VU meter registers zero level on its scale when the voltage = 0.775 at 1 milliwatt & 600 ohms impedance. This is usually modified so that 0 (zero) corresponds to 1.23 volts or + 4 dbm. The ballistic ...