sequence of calibrations from a reference to the final measuring system, where the outcome of each calibration depends on the outcome of the previous calibration
sequence of calibrations from a reference to the final measuring system, where the outcome of each calibration depends on the outcome of the previous calibration
NOTE 1 Measurement uncertainty necessarily increases along the sequence of calibrations.
NOTE 2 The elements of a calibration hierarchy are one or more measurement standards and measuring systems operated according to measurement procedures.
NOTE 3 For this definition, the 'reference' can be a definition of a measurement unit through its practical realization, or a measurement procedure, or a measurement standard.
NOTE 4 A comparison between two measurement standards may be viewed as a calibration if the comparison is used to check and, if necessary, correct the quantity value and measurement uncertainty attributed to one of the measurement standards.