What do you mean by the term CMRR

What do you mean by the term CMRR? Describe in brief.

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The abbreviation of CMRR is common mode rejection ratio. This is a measure of the capability of a test instrument to reject interference which is common to both of its measurement input terminals. This is expressed in decibels and it is the ratio of real or common signal level appearing on the two input terminals altogether to the measured level.

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