Glossary · definition
Measurement uncertainty
A non-negative parameter characterising the dispersion of the values that could reasonably be attributed to the measurand. Usually reported as an expanded uncertainty with a stated coverage factor (commonly k = 2).
See also:CMC (Calibration and Measurement Capability)RepeatabilityDecision rule
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Articles on Measurement uncertainty
Measurement uncertainty explained
What an uncertainty statement means, how it is built up, and why a coverage factor matters.
Evaluation of measurement uncertainty (clause 7.6)
Laboratories must identify contributions to uncertainty and, for calibration, evaluate the uncertainty of every result — including calibration of their own equipment.
What is a decision rule and why every certificate needs one
A decision rule states how measurement uncertainty is accounted for when declaring pass or fail against a tolerance. Simple acceptance, guard banding and non-binary statements are the common choices.
Measurement uncertainty in temperature mapping results
A mapping conclusion — the space is within 2–8 °C — carries the loggers' calibration uncertainty, their resolution and any drift since calibration. Compare the extremes plus uncertainty with the limits.