2. Measurement Process Characterization
2.2. Statistical control of a measurement process

2.2.3.

How is short-term variability controlled?

Emphasis on instruments

Short-term variability or instrument precision is controlled by monitoring standard deviations from repeated measurements on the instrument(s) of interest. The database can come from measurements on a single artifact or a representative set of artifacts.

Artifacts - Case study: Resistivity

The artifacts must be of the same type and geometry as items that are measured in the workload, such as:

1. Items from the workload
2. A single check standard chosen for this purpose
3. A collection of artifacts set aside for this specific purpose

Concepts covered in this section

The concepts that are covered in this section include:

1. Control chart methodology for standard deviations
2. Data collection and analysis
3. Monitoring
4. Remedies and strategies for dealing with out-of-control signals