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The set of operations to determine the value of a measurement quantity.

An attribute of a phenomenon, artifact, or substance that may be distinguished qualitatively and determined quantitatively.

The probability that all the applicable measurement quantities of measuring and test equipment are within tolerance.

Measurement unit, unit of measurement, unit
It is a scalar quantity, defined and adopted by convention, with which any other quantity of the same kind can be compared to express the ratio of the two quantities as a number.

The measuring instrument, measurement standard, reference material or auxiliary apparatus, or a combination thereof, necessary to realize a measurement process.

Measuring instrument
Device used for making measurements, alone or in conjunction with supplementary device(s). A measuring instrument alone may be considered to be a measuring system. A measuring instrument may be an indicating measuring instrument or a material measure.

Measuring transducer
Device used in measurement which provides an output quantity having a specified relation to the input quantity (thermocouple, current transformer, strain gauge, pH electrode, Bourden tube, bimetal strip).

The component of the output noise power that arises from sources within the network under test. This component of output noise is usually differentiated from the component that comes from amplifying the noise that originates in the input source for the network.

The temperature (Ta) that yields the available power spectral density from a source. It is obtained when the corresponding reflection coefficients for the generator and load are complex conjugates.

A group of people and facilities with an arrangement of responsibilities, authorities, and relationships.


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