quantity which is not the subject of the measurement and whose change affects the relationship between the indication and the result of the measurement
NOTE 1 – This term is used in the "uncertainty" approach.
NOTE 2 – Influence quantities can originate from the measured system, the measuring equipment or the environment.
NOTE 3 – As the calibration diagram depends on the influence quantities, in order to assign the result of a measurement it is necessary to know whether the relevant influence quantities lie within the specified range.
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