U CRM CONTROL SERVICE FOR MAC ISO
A NIST RM meets the ISO definition for a RM and may meet the ISO definition for a CRM (depending on the organization that produced it). NIST Reference Material - Material issued by NIST with a report of investigation instead of a certificate to: (1) further scientific or technical research (2) determine the efficacy of a prototype reference material (3) provide a homogeneous and stable material so that investigators in different laboratories can be ensured that they are investigating the same material and (4) ensure availability when a material produced and certified by an organization other than NIST is defined to be in the public interest or when an alternate means of national distribution does not exist. The term "Standard Reference Material" is registered with the United States Patent and Trademark Office. Note: An SRM is prepared and used for three main purposes: (1) to help develop accurate methods of analysis (2) to calibrate measurement systems used to facilitate exchange of goods, institute quality control, determine performance characteristics, or measure a property at the state-of-the-art limit and (3) to ensure the long-term adequacy and integrity of measurement quality assurance programs.
NIST Standard Reference Material® (SRM) - A CRM issued by NIST that also meets additional NIST-specific certification criteria and is issued with a certificate or certificate of analysis that reports the results of its characterizations and provides information regarding the appropriate use(s) of the material (NIST SP 260-136). Reference Material Certificate - Document accompanying a certified reference material stating one or more property values and their uncertainties, and confirming that the necessary procedures have been carried out to ensure their validity and traceability. VIM has an analogous definition (ISO/IEC Guide 99:2007, 5.14). ISO Guide 31 gives guidance on the contents of certificates. Metrologically valid procedures for the production and certification of reference materials are given in, among others, ISO Guides 34 and 35. Uncertainties for such attributes may be expressed as probabilities. The concept of value includes qualitative attributes such as identity or sequence. However, Note 3 of ISO/IEC Guide 99:2007, 5.13, specifically includes the concept of qualitative attributes, called "nominal properties".Ĭertified Reference Material (CRM) - Reference material characterized by a metrologically valid procedure for one or more specified properties, accompanied by a certificate that provides the value of the specified property, its associated uncertainty, and a statement of metrological traceability
International Vocabulary of Metrology – Basic and General Concepts and Associated Terms has an analogous definition (VIM - ISO/IEC Guide 99:2007, 5.13), but restricts the term "measurement" to apply to quantitative values and not to qualitative properties. Uses may include the calibration of a measurement system, assessment of a measurement procedure, assigning values to other materials, and quality control.Ī single RM cannot be used for both calibration and validation of results in the same measurement procedure. Properties can be quantitative or qualitative, e.g.
Reference Material (RM) - Material, sufficiently homogeneous and stable with respect to one or more specified properties, which has been established to be fit for its intended use in a measurement process
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