A logarithmic unit of power, similar to dB m but computed from voltage measurements.

The reference level is 0.775 volts, the voltage which generates a power of 1 milliwatt across a circuit having an impedance of 600 ohms.

A voltage of V volts corresponds to a power of 20log10(V/0.775) dB u.

See also: dBm, Decibel.

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Subjects: Units