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IEVref:702-07-01ID:
Language:enStatus: Standard
Term: bel
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Symbol: symb.: B
Definition: a unit used to express the ratio of two powers by the decimal logarithm of this ratio

NOTE 1 – The bel may also be used to express the ratio of two field quantities. To obtain the same numerical value as for the corresponding power ratio, the logarithm of the field quantity ratio is multiplied by the factor 2, assuming that the impedances are equal.

NOTE 2 – This unit is not often used, having been superseded by the decibel.


Publication date:1992-03
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