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Metrological traceability chain

5 January, 2016 - 12:42

The users of measuring instruments must understand the instruments' working principles before use. This is because we must know an instrument's limitations, sources of errors, and so on, so that we can get precise measured data. Here we will discuss the general principle of the 'metrological traceability chain'.

The metrological traceability chain is the linkage of the elements that make up measuring equipment or a measuring system, which channels the transfer of a measurement signal from the input of the measurand to the output of the measured value.

The VIM defines it as sequence of measurement standards and calibrations that is used to relate a measurement result to a reference.

In a typical measurement process, a person uses an instrument to measure the mass of a substance. The substance is placed on an electronic balance. The sensor, for example a load cell, will be activated, and the measured signal is converted and processed through the signal conditioner and signal processor. The mass value will be shown on the display panel of the electronic balance.