Type of standards according to hierarchy of standards
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There is a three-level hierarchy of physical measurement standards. At the top of the tree are the master standards – these are known as primary standards. Primary standards are made to the highest metrological quality and are the definitive definition or realization of their unit of measure.
The next quality standard in the hierarchy is known as a secondary standard. Secondary standards are calibrated with reference to a primary standard.
The third level of standard, a standard which is periodically calibrated against a secondary standard, is known as a working standard.Working standards are used for the calibration of commercial and industrial measurement equipment.
The next quality standard in the hierarchy is known as a secondary standard. Secondary standards are calibrated with reference to a primary standard.
The third level of standard, a standard which is periodically calibrated against a secondary standard, is known as a working standard.Working standards are used for the calibration of commercial and industrial measurement equipment.
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