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Displaying 1 - 25 of 44

Measurement units as quantities of objects or values of quantities: a discussion

August 24, 2018
Author(s)
Charles D. Ehrlich, Leslie R. Pendrill, Luca Mari
Measurement units have historically been defined as quantities (specific properties) of objects, such as the mass of a particular piece of metal or the length of a particular rod. While the current SI Brochure endorses this position, the draft 9th SI

Uncertainty of Error: The Error Dilemma

May 11, 2016
Author(s)
Charles D. Ehrlich
Measurement error has historically been defined in the metrology community as a difference of 'values,' usually as a difference between a 'measured value' and a 'reference value.' The reference value is sometimes considered to be a 'true value,' which is

Fastener Quality Act of 1990; Public Law 101-592

October 16, 2008
Author(s)
Charles D. Ehrlich
The OSS' Technical Standards Activities Program (TSAP) manages responsibilities assigned to NIST under the Fastener Quality Act (FQA) of 1990. Fasteners are a $6 billion U.S. industry critical to the automobile, aerospace, construction, chemical and

Issues and Trends in Legal Metrology (from a U.S. Perspective)

October 16, 2008
Author(s)
Charles D. Ehrlich, H V. Oppermann
Several current aspects of legal metrology are likely to change significantly over the next 10 years to 20 years. Exponential increase in the use of technology in the marketplace requires legal metrology officials to become increasingly knowledgeable in a