Test uncertainty ratio

About D.E.V.I.C.E.
The ratio of the span of the tolerance of a measurement quantity subject to calibration, to twice the 95% expanded uncertainty of the measurement process used for calibration.

NOTE: The applies to two-sided tolerances.

Source: ANSI/NCSL Z540.3-2006 Requirements for the Calibration of Measuring and Test Equipment / sub-clause 3.11


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