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Measurement units
Introduction
SI Units (Système International d’Unités, ) are used throughout this text. Under ISO 15189 ( ) there are two standards relating to measurement and measurement units (ISO 15189 standards F3.3 and F3.4). To attain ISO 15189 accreditation, laboratories must ensure equipment used for critical measurements be calibrated to SI units and verified fit for purpose. In every test there is a degree of uncertainty but where possible this must be minimized.
Structure of SI units
The SI consists of two types, base and derived units. It also includes a series of prefixes by means of which decimal multiples and submultiples of units can be formed.
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