How are acceptance tolerances defined in measurement verification?

Acceptance tolerances in measurement verification are crucial for ensuring that measurement systems perform within allowable limits for accurate results. They are typically defined as half of the maintenance tolerances. This approach provides a clear standard for determining whether a measurement device is functioning adequately after it has been calibrated or maintained. By setting acceptance tolerances at this level, organizations can ensure that only measurements that meet stringent performance criteria are deemed acceptable, thus enhancing the reliability and accuracy of measurements.

In contrast, defining acceptance tolerances as a fixed percentage of the calibration range or based on manufacturer recommendations does not provide the same level of precision and control over measurement verification. Meanwhile, using them exclusively for type approvals narrows their applicability too much, as acceptance tolerances are essential in various contexts beyond just initial approvals. Thus, defining them as half of the maintenance tolerances strikes a balance that effectively supports ongoing measurement reliability.