Calibration determines the metrological characteristics of a measurement instrument or sample in the state in which it is found. The accreditation of a laboratory which undertakes calibrations ensures the long-term metrological traceability of national or international samples. The ultimate objective is the reduction of margins of error in making measurements.
Calibration is a part of the management system of measurement instruments and it is a metrological confirmation for guaranteeing the conformity of equipment for measuring against the necessary requirements.
Broadly speaking, metrological confirmation includes:
The calibration of instruments is carried out:
Errors revealed by means of calibration are compared with the metrological requirements for use of the measurement equipment.
Finally the label is placed and then, where necessary, sealed.
Calibrations are classified in relation with the metrological area to which the instruments, the systems and the measurement samples belong, in accordance with the quantities or properties against which they have been measured. The metrological areas include physical properties (mass, volume, force, length), physical properties such as pH, concentration of substance or areas including vehicles or ionized radiations.