QIMT Glossary

Definitions of Metrology terms & phrases.

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Set of operations that establish, under specified conditions, the relationship between values of quantities indicated by a measuring instrument or measuring system, or values represented by a material measure or a reference material and the corresponding values realised by standards.

Calibration certificate

Result(s) of a calibration can be registered in a document sometimes called a calibration certificate or a calibration report.

Calibration history, measuring equipment

Complete registration of the results from the calibration of a piece of measuring equipment, or measuring artefact, over a long period of time, to enable the evaluation of the long-term stability of the piece of equipment or the measuring artefact.

Calibration interval

Time interval between two consecutive calibrations of a measuring instrument.

Calibration report

Result(s) of a calibration can be registered in a document sometimes called a calibration certificate or a calibration report.


Consultative Committee for Acoustics, Ultrasound and Vibrations. Established 1998.


Consultative Committee for Electricity and Magnetism. Established 1927.


Consultative Committee for Length. Established 1952.


Consultative Committee for Mass and related quantities. Established 1980.


Consultative Committee for Photometry and Radiometry. Established 1933.


Consultative Committee for Amount of Substance - Metrology in chemistry. Established 1993.


Consultative Committee for Ionising Radiation. Established 1958.


Consultative Committee for Thermometry. Established 1937.


Consultative Committee for Time and Frequency. Established 1956.


Consultative Committee for Units. Established 1964.


Centro Español de Metrología, the national metrological institute of Spain.


Comité Européene de Normalisation. European standardisation organisation.


Conférence Générale des Poids et Mesures. Held for the first time in 1889. Meeting every 4th year.

Check standard

Working standard routinely used to ensure that measurements are made correctly.


Comité Internationale des Poids et Mesures.



Calibration and Measurement Capabilities


Czech Metrology Institute, the national metrological institute of the Czech Republic.

Compound standard

Set of similar material measures or measuring instruments that, through their combined use, constitutes a standard.

Conformity assessment

An activity that provides demonstration that specified requirements relating to a product, process, system, person or body are fulfilled, i.e. testing, inspection, certification of products, personnel and management systems.

Conventional true value (of a quantity)

Value attributed to a particular quantity and accepted, sometimes by convention, as having an uncertainty appropriate for a given purpose. Sometimes called “assigned value”, “best estimate of the value”, “conventional value”, or “reference value”.


Euro-Asian cooperation of national metrological institutions.

Correction factor

Factor by which the uncorrected measuring result is multiplied to compensate for a systematic error.

Correction value

Value which added algebraically to the uncorrected result of a measurement compensates for a systematic error.


See Reference material, certified.


National Metrology Laboratory, the national metrological instituteSouth Africa.


The national metrological institute of Australia. The National Measurement Laboratory NML is a National Facility within the Commonwealth Scientific and Industrial Research Organisation CSIRO.

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