BS PD ISO GUIDE 33:2015

BS PD ISO GUIDE 33:2015 describes good practice in using reference materials (RMs), and certified reference materials (CRMs) in particular, in measurement processes. These uses include the assessment of precision and trueness of measurement methods, quality control, assigning values to materials, calibration, and the establishment of conventional scales. This Guide also relates key characteristics of various types of RMs to the different applications.

For CRMs, the metrological traceability of the property values to international scales or other measurement standards has been established. For RMs not being CRMs, this kind of traceability of property values has often not been established. Nevertheless, these RMs can still be used for assessing parts of measurement procedures, including evaluating various levels of precision

Mainstream applications of RM include precision control (Clause 8), bias assessment (Clause 9), calibration (Clause 10), preparation of calibration RMs (Clause 11) and maintaining conventional scales (Clause 12).

NOTE Not all types of RMs can be used for all indicated purposes.

The preparation of RMs for calibration is also part of the scope of ISO Guides 34[1] and 35[2]. The treatment in this Guide is limited to the fundamentals of small-scale preparation of RMs and the value assignment, as used by laboratories to calibrate their equipment. Larger scale production of such RMs, with the possible aim of distribution is beyond the scope of this Guide. This type of activity is covered in ISO Guides 34[1] and 35[2].

The development of working standards, as used in, e.g. natural gas analysis, clinical chemistry, and the pharmaceutical industry is not covered in this Guide. This type of activity is covered in ISO Guides 34[1] and 35[2].

Cross References:

ISO 3534-1

ISO Guide 30

ISO/IEC Guide 98-3

ISO/IEC Guide 99:2007

ISO Guide 34

ISO Guide 35

ISO Guide 80

ISO/IEC 17025

ISO 15189

NEN 7779:2008

ISO 5725-1

ISO 5725-2

ISO 5725-3

ISO 5725-4

ISO 5725-5

ISO 5725-6

ISO 7870-5

ISO 16269-4

ISO Guide 31

ISO 15194

ISO 6143

ISO 3534-1

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