Abstract

[This abstract is based on the author's abstract.]With the evolution of standards, recommendations on measurement acceptance decisions in metrology/calibration have changed. The test accuracy ratio (TAR) has been used, but was replaced by the test uncertainty ratio (TUR) when the guide to uncertainty of measurements (GUM) introduced measurement uncertainty into the equation. Laboratories protected themselves by using guard banding techniques to make acceptance decisions. It is demonstrated in this discussion how TUR and banding techniques are applied to determine, assess, and minimize risks when analyzing calibration data.