Многоезичен |
|
WEB - речник по метрология |
|
Многоезичен |
|
WEB - речник по метрология |
|
| certified reference material (CRM) |
| reference material, accompanied by a certificate, one or more of whose property values are certified by a procedure which establishes traceability to an accurate realization of the unit in which the property values are expressed, and for which each certified value is accompanied by an uncertainty at a stated level of confidence |
NOTES
1 The definition of a "reference material certificate" is given in 4.2*.
2 CRMs are generally prepared in batches for which the property values are determined within stated uncertainty limits by measurements on samples representative of the whole batch.
3 The certified properties of certified reference materials are sometimes conveniently and reliably realized when the material is incorporated into a specially fabricated device, e. g. a substance of known triple-point into a triple-point cell, a glass of known optical density into a transmission filter, spheres of uniform particle size mounted on a microscope slide. Such devices may also be considered as CRMs.
4 All CRMs lie within the definition of "measurement standards" or "etalons" given in the "International Vocabulary of basic and general terms in metrology (VIM)".
5 Some RMs and CRMs have properties which, because they cannot be correlated with an established chemical structure or for other reasons, cannot be determined by exactly defined physical and chemical measurement methods. Such materials include certain biological materials such as vaccines to which an International unit has been assigned by the World Health Organization.
This definition, including the Notes, is taken from ISO Guide 30:1992.
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* The term "Reference material certificate" mentioned on Note 1 above is given in ISO Guide 30:1992.
Определенията на термините, забележките и примерите към тях са съгласно изискванията на OIML - V 2 (1993)
