Estimating measurement uncertainties

Glossaire

Maximum permissible error (of a measuring instrument)

Extreme values of measurement error, permitted by specifications, regulations, etc., for a given measuring instrument.

Measurement uncertainty

Parameter associated with the result of a measurement, characterizing the dispersion of the quantity values which can reasonably be attributed to the measurand.

Random error of measurement

Result of a measurement minus the average from an infinite number of measurements of the same measurand, when these measurements are performed in repeatability conditions.

Repeatability

Closeness of agreement between the successive measurement results for the same measurand, with these measurements performed in the exact same measurement conditions.

These conditions are called r"epeatability conditions", and include:

  • the same operating procedure,

  • the same observer,

  • the same measuring instrument used in the same conditions,

  • replication of measurements within a short period of time.

Systematic measurement error

Average which would result of an infinite number of measurements of the same measurand when these measurements are performed in repeatability conditions, minus a true value of the measurand.

AccueilCoursNouvelle page