The measurement assurance concept in calibration and traceability at NBS/NIST

Belanger, B. C.

doi:10.1007/3-540-27093-0_16

Cited by 1 publication

(1 citation statement)

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“…One of the most pragmatic statements concerning the meaning of traceability, and which relates to today's quality management systems, dates from 25 years before the date of submission of this paper: 'Measurement traceability has been achieved when the reference standards base is specified and when the total measurement uncertainty relative to those standards has been shown to be sufficiently small for the intended purpose' [3]. Today, ISO/IEC 17025 [30] requires traceability to SI units in most cases and, moreover, demonstrated competence of the calibration laboratory concerned.…”

Section: Traceability Fundamentalsmentioning

confidence: 99%

Measurement uncertainty and traceability

Cox

Harris

2006

Meas. Sci. Technol.

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Obtaining confidence in a measured value requires a quantitative statement of its quality, which in turn necessitates the evaluation of the uncertainty associated with the value. The basis for the value and the associated uncertainty is traceability of measurement, involving the relationship of relevant quantities to national or international standards through an unbroken chain of measurement comparisons. Each comparison involves calibration of a standard at one level in the chain using a standard at a higher level. Global economy considerations mean that this basis also requires the national measurement institutes to carry out comparative assessment of the degree of equivalence of national standards through their participation in key comparisons. The evaluation of uncertainty of measurement is founded on the use of models of measurement for each stage of the chain and at the highest level to interrelate national standards. Basic aspects of uncertainty evaluation are covered in this paper, and forms for the above types of model considered, with attention given to least squares as a basis for calibration curves (and certain other types of calibration) and also for key comparison data evaluation.

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Section: Traceability Fundamentalsmentioning

confidence: 99%