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What is the difference between a test accuracy ratio (TAR) and a test uncertainty ratio (TUR)?

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What is the difference between a test accuracy ratio (TAR) and a test uncertainty ratio (TUR)?

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The definition of TAR has evolved somewhat. It began as the “ratio of the tolerance limits of a unit under test (UUT) attribute to the tolerance limits of a measurement reference.” Other definitions have emerged over the years, most of which replace the measurement reference tolerance limits with some variation of the uncertainty in the measurement process. Until recently, “TUR” has usually just been another way of saying “TAR.” In 2006, TUR was given an “official” definition in ANSI/NCSL Z540.3: “The ratio of the span of the UUT tolerance limits to twice the expanded uncertainty of the calibration process.” A caveat was added saying that this definition is valid only for symmetrical two-sided UUT tolerance limits.

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