The difference between verification and calibration

the difference

Verification

calibration

nature

It has legality and belongs to the government. Implementing mandatory management according to law is an important measure to implement legal measurement management.

Does not have legality, is a market behavior. The implementation of self-management is a voluntary requirement for the use of units to implement traceability

Objects

Strongly inspect the measuring instruments according to law. That is, it is used in measuring instruments that are involved in trade settlement, security protection, medical and health, environmental monitoring, etc.

Other illegally-made measuring instruments (including non-strongly-checked measuring standards and working measuring instruments)

purpose

Demonstrate that measuring instruments can meet the requirements of relevant measurement laws and regulations so as to avoid inaccurate and dishonest measurements and to safeguard the interests of the country, the collective and the people.

Determine the correct value indicated by the measuring instrument, so that the measurement performance of the measuring instrument can meet the requirements of the intended use

the way

Top-down delivery of quantitative values ​​belongs to the category of measurement legal system management, and regular fixed-point verification is carried out.

Bottom-up conduct traceability of value, is the use of unit independent behavior, voluntary traceability

executive department

National legal metrology institutes and authorized metrology institutes

With calibration capabilities, certified calibration agencies (including statutory and authorized measurement technical institutes, calibration laboratories) or independent

content

Comprehensively evaluate the performance of measuring instruments, including measurement requirements, technical requirements and administrative requirements, with comprehensiveness

Mainly assess the relationship between the value indicated by the measuring instrument and the value of the recurrence of the corresponding measurement standard

in accordance with

Metrological verification procedures are mandatory statutory technical documents. Some countries have organized according to law

Measurement calibration specifications, calibration methods, or other technical documents agreed by both parties. It can be formulated by the country and can also be prepared by the calibration unit itself.

Result form

Certificate of Verification (Qualified); Notice of Verification Results (Failed). Legal documents

Calibration certificate, calibration report

personnel

Qualified statutory verification personnel

Measurement and calibration personnel who have the ability to confirm or register with the organization, issue certificates to the society, and report approval

Cycle interval

Implement mandatory periodic verification. The verification cycle is stipulated by government statutory documents and has legality.

According to the degree of use and maintenance of measuring instruments, the use unit determines the interval for re-calibration, which has flexibility and applicability.

focus point

The traceability of the measurement standard equipment used value and determine whether the measurement instrument meets the statutory requirements, whether it meets the maximum allowable error, and draws a conclusion whether the measurement is qualified or not.

Concerned about whether the establishment of measurement traceability and the provision of measurement uncertainty values, which can provide the basis for the use of unit evaluation is consistent with the expected use requirements. Of course, calibration can also be concluded with other technical documents agreed by both parties.