Engineering:Circuit noise level
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At any point in a transmission system, the ratio of the circuit noise at that point to an arbitrary level chosen as a reference.
The circuit noise level is usually expressed in dBrn0, signifying the reading of a circuit noise meter, or in dBa0, signifying circuit noise meter reading adjusted to represent an interfering effect under specified conditions.
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Original source: https://en.wikipedia.org/wiki/Circuit noise level.
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