decibels above reference coupling

decibels above reference coupling

[′des·ə·bəlz ə¦bəv ′ref·rəns ‚kəp·liŋ]
(electricity)
A measure of the coupling between two circuits, expressed in relation to a reference value of coupling that gives a specified reading on a specified noise-measuring set when a test tone of 90 dBa is impressed on one circuit. Abbreviated dBx.
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