Dictionary · General
Measurement principle
The phenomenon serving as the basis of a measurement — thermoelectric effect for a thermocouple, Doppler shift for a radar gun.
Related terms
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Systematic measurement error
The component of measurement error that in replicate measurements remains constant or varies predictably. Known systematic errors are compensated by correction.
VIM (JCGM 200:2012) 2.17
Measurement accuracy
Closeness of agreement between a measured value and a true value of the measurand. A qualitative concept — a measurement is more accurate when it offers smaller error, but accuracy itself is not a number.
VIM (JCGM 200:2012) 2.13
Measured quantity value
The quantity value representing a measurement result — the value actually obtained for the measurand in a given measurement.
VIM (JCGM 200:2012) 2.10
Conventional quantity value
A quantity value attributed to a quantity by agreement for a given purpose — the conventional value of local gravity, or the conventional mass of a weight.
VIM (JCGM 200:2012) 2.12
Influence quantity
A quantity that, in a direct measurement, does not affect the quantity actually measured but does affect the relation between the indication and the result — ambient temperature is the classic example.
VIM (JCGM 200:2012) 2.52
Measurement procedure
A detailed description of a measurement according to a principle and method, based on a measurement model — detailed enough that a trained operator can perform it. The SOP is its documented form.
VIM (JCGM 200:2012) 2.6