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QualityTerm

Calibration

Calibration is comparing a measuring instrument with a reference of known accuracy, to establish how much it deviates and whether you can still rely on it for your measurements.

Explanation

Measuring instruments such as thermometers, pressure gauges, scales, gas detectors and sound level meters become less accurate over time. In calibration you compare the reading with a reference, record the deviation and adjust where needed. The result is stated in a calibration certificate.

You decide for each instrument how often it is calibrated, depending on use, the importance of the measurement and the requirements of the manufacturer or your client. A label or record shows when the next calibration is planned. An expired or rejected instrument is not used for measurements that matter.

If an instrument is rejected, you assess what that means for earlier measurements or products. Calibrating is different from official verification, a formal check that belongs to certain measuring instruments, and different from inspecting work equipment, which is about safe use. Keep that distinction clear in your records.

Example from practice

A food producer calibrates its core temperature thermometers on a fixed schedule. If one deviates too much, the measurements since the previous calibration are reviewed and the device is replaced.

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Where you work with Calibration

Calibration & measuring equipmentCalibrate equipment and track certificate validity. ObjectsManage machines, locations and assets centrally. Certificate managementTrack the validity of diplomas and inspections. ISO 9001Quality
Knowledge base

Keep reading

Managing calibration of measuring equipment: register, interval and certificatesYou manage the calibration of measuring equipment with a register in which every instrument has its own line, with accuracy and tolerance, interval, last and next calibration date, certificate and status. Calibration establishes how much an instrument deviates from a reference, so you know whether you can still trust your measurements. Below you can read which instruments to include, how to set the interval, what to do when an instrument turns out to be out of tolerance and what an example register looks like.
Glossary

See also

EvidenceEvidence (objective evidence)Non-conformityNon-conformityCAPACorrective and Preventive ActionISO 9001ISO 9001 Quality management systems

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