R = v / v_c

where v is the value measured by the equipment or assembly under test and v_c is the conventionally true value of this quantity

Note 1 to entry: The input signal to a measuring system may be called the stimulus; the output signal may be called the response.

Note 2 to entry: Response can have several definitions. As an example the definition of the response of a radiation measuring assembly is given.

Note 3 to entry: This entry was numbered 394-40-21 in IEC 60050-394:2007.