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 the contributions to uncertainty and, for calibration, evaluate the uncertainty of every result — their own equipment included.
What is a decision rule and why every certificate needs one
A decision rule states how measurement uncertainty is accounted for in declaring pass or fail: simple acceptance, guard banding or a non-binary statement.
Measurement uncertainty in temperature mapping results
A mapping result carries the loggers' calibration uncertainty, resolution and drift. Compare the extremes plus that uncertainty against the limits.
Pt100 tolerance classes explained (IEC 60751)
Classes AA, A, B and C widen with temperature: Class A is ±0.15 °C at 0 °C but ±0.55 °C at 200 °C. A tolerance class is not a measurement uncertainty.