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quantity value used as a basis for comparison with values of quantities of the same kind.

Many different types of materials and devices may have a reference quantity value and an associated measurement uncertainty. Some examples are given below.
 The quantity value given on the certificate of a certified reference material (CRM) with its associated measurement uncertainty is a reference quantity value for the particular property to which it relates.
 The values of a set of solutions of known concentration, analysed to build a calibration diagram , are reference quantity values used for determining the value of the same quantity in other samples.
 In a calibration laboratory, mercury-in-glass thermometers are calibrated against a measurement standard (thermometer) reproducing specific temperature values (with associated uncertainties): these are reference values of the quantity ‘temperature’.
 Analysts use the value assigned to a CRM as a reference quantity value for the assessment of the trueness of a measurement procedure.
 In order to assess the competence of staff and laboratories, the staff may be required to analyse samples which have assigned values. The value assigned to a sample may be a quantity value obtained either from previous analyses by more experienced staff/laboratories or from PT rounds, or from a certificate if the sample is a CRM. In this context, the value assigned to any of these materials is deemed to be a reference quantity value.

ref: Terminology in Analytica Measurement Introduction to VIM 3

Post Author: ghaemi mohammad

This site has been established to provide updated and specialized information in the field of quality management systems and to share my experiences in the field of conformity assessment and promotion and promotion of this science.

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