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Estimating Measurement Uncertainty from Calibration Testing Data

Abstract: During a calibration test, a unit under test (UUT) is compared with a test instrument to determine if the error in the UUT is smaller than some predefined tolerances. Generally, the resultant data that are stored from such a calibration consist of an indicator of whether the UUT was in tolerance at each test point. Using this information, a Type A analysis of measurement uncertainty is performed that fits the definitions given in the U.S. Guide to the Expression of Uncertainty in Measurement. This Type A analysis contains the information generally obtained using Type B, or non-statistical analyses and may actually be more accurate. An advantage of this approach is that a Type A uncertainty analysis based on data normally gathered during a calibration test can be automated.