Insertion error

In metrology, the insertion error is caused by the presence of the measuring instrument itself, inside the environment in which the measurement is carried out; in other words, the measuring instrument changes the measurement conditions and consequently also changes the final value of the measurand.

Therefore it is said that a measuring instrument is the better, the less it disturbs the phenomenon to be measured; that is, the smaller the entity of the disturbance caused by its presence. This interference can be evaluated if the characteristics of the instrument and in particular of its sensor (or transducer) are known.

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