But all kinds of quality management systems have requirements, and measuring instruments must be managed. To ensure their accurate and reliable use, it is necessary to take corresponding management measures, and the specific management is different.
You mentioned above whether the newly bought measuring instruments need to be verified or calibrated by a third party. I don't think it's necessary to send the test report for inspection if you have audited the manufacturer, verified the qualification and issued a legal and acceptable test report. You can make provisions in the relevant documents of the company. On the contrary, some newly bought measuring instruments also have certificates or test reports, but there is no instrument number on them. Obviously, all the ex-factory instruments are unified reports, and such reports are definitely invalid.
How often to check or calibrate can be determined according to the frequency of use and measurement characteristics, usually one year. For example, there are dozens of watt-hour meters in our company's electricity room, which are not compulsory for inspection and are inconvenient to disassemble. It's basically not bad at ordinary times, so I set the calibration period as 5 years.
I hope my answer can help you.
Supplement: I deny the statement in jijijiang 1224 that the period of compulsory inspection shall not exceed 6 months. For instruments subject to compulsory verification, the state has verification regulations, which should be verified in strict accordance with the period specified in the national verification regulations. The verification period of many instruments exceeds half a year. Of course, the verification period you set is shorter than that specified, and there will be no problem, just an increase in cost.