Adjustment

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Adjustment

Explanation oft the term

In materials testing, adjustment means setting or balancing of a measuring instrument to eliminate systematic measurement deviations to the extent required for the intended application. Adjustment requires expert intervention that permanently changes the measuring instrument. Its aim is to ensure minimum measurement uncertainties.

During adjustment, the measured value of a measuring instrument is set to the known value of a measuring object used (e.g. by comparison with a standard or etalon). The measuring instrument must be operated under prescribed or agreed reference conditions (external conditions such as temperature, humidity, position, location, etc.).

After each adjustment, a new calibration must take place, because changes to the measuring instrument invalidate a previously performed calibration. Adjustment differs from calibration in that the latter takes place without intervention in the measuring instrument. In accredited testing laboratories, the use of calibrated measuring instruments is mandatory as part of the monitoring of measuring equipment. If the calibration is carried out by an authorised testing laboratory (State Office of Weights and Measures, Bundesanstalt), the measuring instrument is considered to be calibrated or verified (see: Verification).

Example: Adjusting a weigh scale to "0" by interfering with the mechanics.

Explanation oft the term

See also