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Title: Progress In Metrology From The Adoption Of The Absolute Units In 1948 To The Application Of Uncertainty Today
Author: David W. Braudaway
Source: 2006 Measurement Science Conference
Year Published: 2006
Abstract: The history of the electrical units beginning with the 1948 change from the International Electrical Units to the Absolute Electrical Units is reviewed. The change from the conventional methods of expressing accuracy through development of the uncertainty methods is followed. Included are effects of some of the attitudes and practices as instruments and standards become more precise and automation and computers were applied. The development of metrological uncertainty is also reviewed with a discussion of the effects of international recommendations and standards. The necessity of knowing not only values but also their uncertainty is expressed the use and effects of the coordinated values for the Fundamental Physical Constants is reviewed.

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