Calibration

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Calibration

Measurement process

In materials testing, the term calibration, i.e. the practical activity of ‘calibrating’, refers to the determination of the relationship between the measured values of a measuring system used and the corresponding values defined by reference to ‘standards’. In measurement testing technology, calibration is understood as a measurement process for determining and documenting the deviation of a measuring device (see: measurement deviation) or a measuring standard from the ‘correct’ value, represented by a reference standard.

The deviations from this standard must be documented and taken into account for correction during subsequent use of the measuring device.

Target and actual comparison

Calibration always provides a snapshot of the target and actual status of a scientific or technical device or a measurement method. The time between two calibrations is referred to as the calibration interval. Extending calibration intervals may increase the uncertainty of measurement results. One common problem is the temporal behaviour (drift) of a measuring device. Statements on this can only be made after repeated calibrations.

Examples

Possible temperature drifts must also be taken into account, e.g. in WHEATSTONE bridge circuits for recording force–time signals in instrumented test methods such as instrumented Charpy impact tests (ICIT), instrumented tensile impact tests (ITIT) and instrumented puncture impact tests (instrumented free-falling dart test).

See also

• Verification
• Adjustment
• Measure
• Measurement deviation
• Measuring uncertainty
• Measuring device monitoring
• Testing

References

• Blumenauer, H. (Ed.): Werkstoffprüfung. Deutscher Verlag für Grundstoffindustrie, Leipzig Stuttgart (1994), 6th Edition (ISBN 3-342-00547-5; see AMK-Library under M 3)

Weblink

• Wikipedia – The Free Encyclopedia: Calibration https://en.wikipedia.org/wiki/Calibration