Calibration vs verification: related activities with different outputs.
Understand when you need measured comparison data, when a functional or conformity check is appropriate and why adjustment is a separate action.
Calibration establishes a relationship between instrument indication and reference values under stated conditions. Verification provides objective evidence that specified requirements have been fulfilled.
What calibration establishes
Calibration produces measurement information such as error, correction and uncertainty across stated points. It does not necessarily include adjustment and does not automatically declare the instrument suitable for every use.
The result supports later correction, conformity evaluation or understanding of measurement capability.
What verification confirms
Verification checks specified requirements using objective evidence. It might confirm that an instrument remains within an allowed tolerance or that a function produces an expected response.
The method and evidence must be suitable for the requirement; a quick check may not provide the information or traceability of a calibration.
Choose the activity from the decision
Ask what must be known. If quantified measurement error and uncertainty are needed, calibration is likely required. If the need is to confirm a defined requirement, verification may be appropriate.
Adjustment changes the instrument and should be followed by suitable measurement activity to establish its post-adjustment condition.
Authoritative guidance
Use these primary sources alongside your organisation's competent technical and legal advice.
Calibration vs verification FAQs
Is a calibration automatically a verification?
No. Calibration provides a relationship and results; verification is confirmation against specified requirements.
Is adjustment part of calibration?
Adjustment is a separate action that changes instrument response, although it is often performed during the same service visit.
Can a reference check replace calibration?
Only where the defined measurement requirement and risk show that the check provides sufficient evidence.
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