QIMT Glossary

Definitions of Metrology terms & phrases.

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Sveriges Provnings- och Forskningsinstitut, the national metrological institute of Sweden.


Modulus of the difference between two limits of a nominal range.


The ability of a measuring instrument to maintain constant its metrological characteristics with time.


See Measuring standard.

standard deviation


"Measure of the unpredictability of a random variable, expressed as the average deviation of a set of data from its arithmetic mean and computed as the positive square root of the variance. Customarily represented by the lower-case Greek letter sigma (σ), it is considered the most useful and important measure of dispersion which has all the essential properties of the variance plus the advantage of being determined in the same units as those of the original data. Also called root mean square (RMS) deviation."

As per the ISO GUM, the standard deviation = the standard uncertainty for the given contributor.

Standard deviation, experimental

Parameters for a series of n measurements of the same measurand, characterises the dispersion of the results and is given by the formula for standard deviation.

Standard Reference Material,

see Reference Material, Certified.

Standard, compound

A set of similar material measures or measuring instruments that, through their combined use constitutes one standard called a compound standard.

Standard, transfer

Standard used as an intermediary to compare standards.

Standard, travelling

Standard, sometimes specially composed, for use in making comparisons between standards at different locations.

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