How to determine which instruments to do the test, which to do calibration

"Calibration" and "verification" are two different ways and means to ensure the accuracy and validity of quantitative values. Calibration and verification from the traceability, they are the same, but from the legal effect, they are different. GJB9001A-2001 standard 7.6 clause a) requirements: traceability to the international or national standards of measurement standards, if necessary, measuring equipment should be in accordance with the specified time interval or before use for calibration or verification. The word "or" in the standard establishes a parallel and optional relationship between calibration and verification. Under the premise of meeting the laws and regulations, enterprises and institutions can choose their own methods of verification or calibration for different situations.

Calibration is a voluntary traceability behavior of enterprises and institutions, not mandatory, enterprises and institutions can be calibrated on their own, can also be entrusted to an external agency for calibration. The result of calibration is a calibration certificate or calibration report, the report does not judge the qualification of measuring instruments, generally is not a technical document with legal effect. The verification belongs to the national mandatory law enforcement behavior, the results of the verification must be sent to the measuring instruments, instruments and equipment to make a qualified or not, when the results are qualified, it will be issued to the certificate of verification, unqualified will be issued to the unqualified notice, the results of the verification has the force of law.

Measuring instruments belonging to the mandatory verification must also meet two conditions: First, the instrument is included in the national mandatory verification of the work of the meter directory; Second, the measuring instruments must be used for trade settlements, safety and security, medical care, environmental testing for specific purposes. Used for trade settlement, safety and security, medical and health, environmental testing purposes other than measuring instruments, such as scientific research, production, management and management of measuring instruments, generally in accordance with the non-compulsory verification of measuring instruments for management and control.