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A tolerance is a design feature that defines limits within which a quality characteristic is supposed to be on individual parts; it represents the maximum allowable deviation from a specified value.
The systematic description of known uncertainties relevant to specific measurements or types of measurements, categorized by type of measurement, range of measurement, and/or other applicable measurement criteria.
Uncertainty is a property of a measurement result that defines the range of probable values of the measurand
Type B evaluation of measurement uncertainty includes any method except statistical analysis of actual measurement results.
Type A evaluation of measurement uncertainty is the statistical analysis of actual measurement results to produce uncertainty values
In a calibration procedure, the test uncertainty ratio (TUR) is the ratio of the accuracy tolerance of the unit under calibration to the uncertainty of the calibration standard used.
A systematic error is the mean of a large number of measurements of the same value minus the (probable) true value of the measured parameter
The uncertainty of the result of a measurement, expressed as a standard deviation. (GUM, 2.3.1)
One or more numerical results of a calibration process, with the associated measurement uncertainty, as recorded on a calibration report or certificate.
Random error is the result of a single measurement of a value, minus the mean of a large number of measurements of the same value.