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Title: Applying The IS0 Guide To The Expression Of Uncertainty In Measurement In A Mass Metrology Laboratory
Author: Mark Fritz
Source: 1995 Measurement Science Conference
Year Published: 1995
Abstract: The publication of the IS0 Guide to the Expression of Uncertainty in Measurement and NIST Technical Note 1297, Guidelines for Evaluating and Expressing the Uncertainty of NIST Measurement Results, has resulted in our having to rethink our approach to uncertainty in the mass measurement laboratory. In the process of changing to the IS0 Guide, I have completed a thorough uncertainty analysis. Classifying components by type A and type B. The analysis begins with the air density calculation and looks at the effects of uncertainty in the measurements of barometric pressure, temperature, and relative humidity, and the contribution of each toward the total uncertainty of the air density calculation used in the mass calculation. The next step is determining the uncertainty of the balance using a statistical process. While this analysis is statistical in nature, it also includes other components of uncertainty which must be considered. Finally all uncertainties are combined with the uncertainties of the primary standards using the root sum square technique. In this paper I will elaborate on how I analyzed each component and give rationales on why I took certain approaches. I will conclude with a comparison with the traditional approach to uncertainty reporting in mass measurements, and discuss the new smaller uncertainty numbers. Emphasizing how they do not reflect a radical improvement in measurement technology but just a new way of expressing the uncertainty.

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