First confirm the legitimacy of the unit that issued the certificate. If the unit that issued the certificate is qualified and legally established, the certificate issued by the institute will be available for verification, calibration, and testing; if the unit that issued the certificate is If the unit does not have relevant qualifications, the certificate issued by the company cannot be used, and the company needs to perform verification, calibration or testing. The specific certificate depends on what kind of instrument you have. Some instruments require a calibration certificate, some require a calibration certificate, and some require a testing certificate.
The difference between verification, calibration and testing:
Calibration: Under specified conditions, to determine the quantity value indicated by the measuring device or measuring system, or the physical quantity or reference material. A set of operations that relate a quantity represented to the quantity represented by a standard. (Briefly described as: a set of operations to determine the relationship between the indication value and the corresponding standard value under specified conditions)
Features: Mainly to determine the indication error of the instrument; it does not necessarily have to be based on statutory regulations The calibration procedures issued by the program approval can be calibrated according to the method provided by the customer; it does not judge whether the instrument is qualified; it only issues a report or calibration certificate, which is a technical document. (When the comprehensive measurement characteristics of the instrument are evaluated, it is natural to draw a conclusion whether it is qualified or not, which is essentially the same as verification)
Verification: a procedure to find out and confirm whether a measuring instrument meets legal requirements. It Including inspection, marking and/or issuance of a calibration certificate.
Characteristics: It must be judged whether the instrument meets the legal requirements; it must be based on the calibration procedures approved and issued according to legal procedures; it must make a conclusion on whether it is qualified and issue a certificate or stamp it; it is legal.
Testing: The specified method is used to test the specified technical performance indicators of a certain object (gas, liquid, solid). It is suitable for quality assessment in various industries, such as: civil construction engineering, water conservancy, food, chemistry, environment, machinery, machinery, etc.
Features: Evaluation based on corresponding specifications and procedures.