Uncertainties in Nist Noise-Temperature Measurements (Classic Reprint)

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Excerpt from Uncertainties in Nist Noise-Temperature MeasurementsThe many different systems and our understanding of them have evolved considerably over the years, with concomitant changes m the uncertainty analyses. Even for systems whose uncertainties have not changed, the method of reporting the uncertainties has changed. Prior to about 1993 the common practice in the nist Noise Project was to compute and quote a worst-case or maximum possible error. This was done by estimating the maximum possible value for each component of the uncertainty and then forming the linear sum of the individual components. In 1992 nist officially adopted the policy of reporting uncertainties which conform to the iso guidelines Accordingly, the measurement services offered by the Noise Project now quote an expanded (20) uncertainty, corresponding to a 95 percent confidence level. This required a conversion from worst-case errors to standard uncertainties for the individual components of uncertainty, as well as a change in the manner of combining the components. As a result of all these changes - in the systems, the analyses, and the method of reporting the uncertainty - the uncertainty analysis for a typical system is now scattered in several different places, often rather inaccessible, and-there are sometimes con¿icting forms for one analysis. The present paper addresses this problem, it assembles.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.