What tool is very effective for ensuring quality assurance of measurement results when used with a check standard?

Using a Shewhart control chart is very effective for ensuring quality assurance of measurement results when used with a check standard because it provides a visual representation of data over time, allowing for easy monitoring of performance and consistency. Control charts help in identifying trends, shifts, or any out-of-control conditions in measurements, making it clear when a process may require adjustment or further investigation.

When establishing a control chart, measured values can be plotted against predetermined control limits, which are derived from the check standard. By continuously monitoring measurement results against these limits, technicians can ascertain whether the measurement process remains stable and in control. This enables quick detection of any deviations from expected performance, effectively facilitating timely corrective actions.

In contrast, other tools mentioned might serve different purposes. The process control handbook offers guidelines and frameworks for process management but does not specifically ensure quality assurance in measurement results. The calibration protocol outlines the steps for calibrating instruments but does not provide a mechanism for ongoing monitoring or detection of issues post-calibration. The measurement standards directory is a reference for various measurement standards but lacks any real-time application for controlling measurement quality.