A measuring system can be compared, changed or checked against a requirement. Those activities should not be merged into a single undocumented statement that the instrument was calibrated.
NIST distinguishes calibration, adjustment and verification when describing measurement-system characterisation. NIST — Characterisation and use of measuring systems.
Identify the activity performed
For a dimensional check, determine whether the record describes a comparison, a physical or software change, or a conformance assessment. The distinction affects how the result is interpreted afterward.
Review subsequent use
Keep the relevant evidence and operating conditions with the measurement process. An adjustment may need appropriate follow-up before the instrument returns to use. Use the actual record rather than inferring the work performed from a service invoice's general heading.
Source reviewed 25 October 2026. Interpretation and original diagrams: PLUSHIP / Qunhe. Examples are illustrative.
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