Glossar - Details
Measurement uncertainty
Non-negative parameter characterizing the dispersion of the quantity values being attributed to a measurand, based on the information used.
Note 1: Measurement uncertainty includes components resulting from systematic effects, e.g., components related to corrections and the associated quantity values of measurement standards, as well as the definitional uncertainty. Sometimes estimated systematic effects are not corrected, and associated contributions to measurement uncertainty are considered instead.
Note 2: The parameter can be, for example: a standard deviation, referred to as standard measurement uncertainty (or a selected multiple thereof), or half the range of an interval with a given coverage probability.
Note 3: Measurement uncertainty generally includes many components. Some of them can be obtained using Type A evaluation of measurement uncertainty based on the statistical distribution of the quantity values from measurement series and characterized by standard deviations. The other components, which can be obtained using Type B evaluation of measurement uncertainty, can also be characterized by standard deviations, determined using probability density functions on the basis of experience or other information.
Note 4: Generally, for a lot of information, it is assumed that the measurement uncertainty is associated with a given quantity value which is assigned to the measurand. A change to this quantity value produces a change in the associated uncertainty
Reference Volume (and volume-specific, additional or differing definitions to the standard):
VDA Volume 5 Measurement and inspection processes, 3rd, revised edition, July 2021
Non-negative parameter characterizing the dispersion of the quantity values being attributed to a measurand, based on the information used.
Note 1: Measurement uncertainty includes components resulting from systematic effects, e.g., components related to corrections and the associated quantity values of measurement standards, as well as the definitional uncertainty. Sometimes estimated systematic effects are not corrected, and associated contributions to measurement uncertainty are considered instead.
Note 2: The parameter can be, for example: a standard deviation, referred to as standard measurement uncertainty (or a selected multiple thereof), or half the range of an interval with a given coverage probability.
Note 3: Measurement uncertainty generally includes many components. Some of them can be obtained using Type A evaluation of measurement uncertainty based on the statistical distribution of the quantity values from measurement series and characterized by standard deviations. The other components, which can be obtained using Type B evaluation of measurement uncertainty, can also be characterized by standard deviations, determined using probability density functions on the basis of experience or other information.
Note 4: Generally, for a lot of information, it is assumed that the measurement uncertainty is associated with a given quantity value which is assigned to the measurand. A change to this quantity value produces a change in the associated uncertainty
Reference Volume (and volume-specific, additional or differing definitions to the standard):
VDA Volume 5 Measurement and inspection processes, 3rd, revised edition, July 2021