What's The Differences Between Verification And Calibration?

- May 22, 2020-


1. Different purposes

Verification—Compulsory comprehensive evaluation of measurement characteristics. The value is uniform, and the verification meets the requirements. It is a top-down quantity transfer.

Calibration-determine whether the monitoring and measuring device is accurate. It belongs to the bottom-up quantity traceability and evaluates the indication error.

2. Different objects
Verification-National compulsory verification: measuring reference device; measuring standard device; a total of 59 working measuring instruments used for trade settlement, security protection, medical and health, and environmental monitoring.
Calibration-measuring instruments and measuring devices other than mandatory verification.

3.Different basis

Verification procedures uniformly formulated by the measurement department authorized by the state.

Calibration-Calibration specifications or calibration methods may be adopted by the country or may be formulated by the organization itself.

4. Different nature
Verification-mandatory, law enforcement actions within the scope of legal measurement management.
Calibration-not mandatory, it is voluntary traceability by the organization.

5. Different cycles
Verification-implemented in accordance with the mandatory verification cycle prescribed by Chinese law.
Calibration-determined by the organization according to the needs of use, it can be performed regularly, irregularly or before use.

6. Different ways
Verification-can only be carried out in a specified verification department or a legally authorized organization.
Calibration-can be self-calibration, external school or combination of self-school and external school.

7, Different content
Verification-Comprehensive evaluation of the measurement characteristics, including the error of the evaluation value.

Calibration-to assess the indication error.


8. Different conclusions

Verification——According to the measurement error range stipulated in the verification procedure, the passing and failing judgments are given and a verification certificate is issued.
Calibration-Does not determine whether it is qualified, only evaluates the error of the displayed value, and issues a calibration certificate or calibration report.


9. Different legal effects

Verification-The verification conclusion is a legally valid document, which serves as the legal basis for verification of measuring instruments or measuring devices.
Calibration-The calibration conclusion is a technical document with no legal effect.



Verification refers to activities in which a legal measurement department or a legally authorized organization, in accordance with verification procedures, through experiments and provides proofs, determines that the indication error of measuring instruments meets the specified requirements.

Calibration refers to proofreading machines, instruments, etc. to make them accurate. Under specified conditions, a set of operations to determine the relationship between the quantity indicated by a measuring instrument or measurement system, or the quantity represented by a physical gauge or reference substance, and the corresponding quantity reproduced by a standard Calibration may include the following steps: checking, correcting, reporting, or adjusting to eliminate any deviations in accuracy of the compared measuring devices.

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