Psophometric voltage

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The weighing curve of the CCIF 1951[1]

Psophometric voltage is a circuit noise voltage measured with a psophometer that includes a CCIF-1951[1] weighting network.

"Psophometric voltage" should not be confused with "psophometric emf," i.e., the emf in a generator or line with 600 Ω internal resistance. For practical purposes, the psophometric emf is twice the corresponding psophometric voltage.

Psophometric voltage readings, V, in millivolts, are commonly converted to dBm(psoph) by dBm(psoph) = 20 log10V – 57.78.


  1. ^ a b "The History of Low-Level Audio Background Noise Measurement". Retrieved 2018-09-14.