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Title: A Methodology For Stating Best Measurement Capabilities Over A Range Of Values
Author: David Deaver
Source: 2011 Measurement Science Conference
Year Published: 2011
Abstract: The Guides to Measurement Uncertainty (GUMs) give very prescriptive methods for calculating measurement uncertainty at individual points. Some laboratories undertake the calculation of uncertainty at many points and state them in their Scope of Accreditation as their Calibration and Measurement Capability (CMC) values formerly known as Best Measurement Capability (BMC). Other laboratories attempt to simplify the effort to generate CMC values by stating them as a formula which spans a number of values. However, there is less guidance as how to use a detailed uncertainty analyses at just a few points to support a large parameter space. This paper shows some of the serious errors being made currently that result in grossly understating some uncertainties and proposes a methodology that is simple but eliminates some of these transgressions.

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