Definitions of Metrology terms & phrases.
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Measurement standard, international
Standard recognised by an international agreement to serve internationally as the basis for assigning values to other standards of the quantity concerned.
Measurement standard, maintenance
Set of operations necessary to preserve the metrological characteristics of a measurement standard within appropriate limits.
Measurement standard, national
Standard recognised by a national decision to serve in a country as the basis for assigning values to other standards of the quantity concerned.
"A parameter associated with the result of a measurement, that characterizes the dispersion of the values that could reasonably be attributed to the measurand."
See Unit of measurement. A particular quantity, defined and adopted by convention, with which other quantities of the same kind are compared in order to express their magnitudes relative to that quantity.
Result of a measurement minus a true value of the measurand.
Measuring error, absolute
When it is necessary to distinguish “error” from “relative error” the former is sometimes called “absolute error of measurement”.
Device intended to be used to make measurements, alone or in conjunction with supplementary devices.
Set of values of measurands for which the error of a measuring instrument is intended to lie within specified limits.