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Title: NIST Measurement Assurance Of Sprt Calibrations On The ITS-90: A Quantitative Approach
Author: G. F. Strouse, B. W. Mangum
Source: 1993 Measurement Science Conference
Year Published: 1993
Abstract: The National Institute of Standards and Technology (NIST) is responsible for realizing, maintaining and disseminating the International Temperature Scale of 1990 (ITS-90) for the United States of America. Oue of the methods used for the dissemination of the scale is the calibration of standard platinum resistance thermometers (SPRTs) and hightemperature SPRTs (HTSPRTs), using thermometric fixed points. At NIST, the calibration of these thermometers as defining, interpolating devices for the ITS-90 includes various internal quality control checks in order to minimize the uncertainty associated with a calibration. The internal measurement assurance program incorporated at NIST includes the use of check (HT)SPRTs, control charts, redundant fixed points, and statistical process control. This program, as well as some results showing fixed-point reproducibility and calibration uncertainties, will be discussed.

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