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The sensitivity of an instrument is

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The sensitivity of an instrument is
  • ASmallest increment in the output that can be detected with certainty
  • BLargest input change to which the instrument fails to respond
  • CRatio of the change in the magnitude of the output to the corresponding change in the magnitude of the input
  • DCloseness of the output values for repeated applications of constant input
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Sensitivity: It is defined as the ratio of the changes in the output of an instrument to a change in the value of the quantity being measured. It denotes the smallest change in the measured variable to which the instrument responds.

Deflection factor or inverse sensitivity is the reciprocal of sensitivity.