Some instruments need verification and some need calibration. Verification is also divided into compulsory inspection and non-compulsory inspection, which is equivalent to calibration. If it belongs to the four aspects of "trade calculation, environmental monitoring, safety protection and medical care", it belongs to the category of compulsory inspection, so it is necessary to do compulsory verification instead of calibration.

If calibration is required, please refer to categories A, B and C in the instrument classification management, and the main classifications are as follows:

Class a instruments and equipment

A) The highest enterprise measurement standard and its supporting equipment used for quantity traceability.

B) Measuring instruments used for trade settlement, safety protection, medical and health care, environmental monitoring, resource protection, statutory evaluation and fair measurement.

C) Measuring equipment used for final quality inspection and test of products.

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Class b instruments and equipment

A) measuring equipment used for key process control and quality inspection in the production process

B) Measuring equipment used by various departments for internal energy and material settlement;

C) Measuring equipment used for scientific research and technical tests to provide data needed for judging test conclusions;

D) Special measuring equipment, measuring equipment with limited application scope.

Class c instruments and equipment

A) Measuring equipment used only for qualitative monitoring during production and operation;

B) The state allows the use of measuring equipment once or within the validity period;

C) Measuring equipment that only gives general instructions and belongs to low-value consumables;

D) The equipment shall be equipped with indicating and measuring equipment which is fixed in installation, difficult to disassemble or will damage the normal use function of the equipment and has no strict accuracy requirements.

The metrological confirmation interval of Class A instruments shall not exceed the longest confirmation interval stipulated by the state, and the verification/calibration shall be carried out in strict accordance with the national verification regulations or calibration specifications. Class B shall be subject to metrological verification or calibration according to the metrological confirmation interval specified by the organization. Class C is subject to one-time verification (initial inspection) and measurement confirmation.

If you are interested in learning more about the basic knowledge of metrology calibration, you can attend training courses such as Metrology Administrator, Metrology Calibrator and Enterprise Metrology Training.