Generally, it is recommended to calibrate once a year in the certificate after the equipment is calibrated. Some people say that some equipment does not need to be calibrated every year. Can the calibration cycle of the equipment be determined by yourself? If the calibration is carried out according to the cycle you specify, will it be recognized by the review group?

It is best to specify the calibration cycle by yourself, because the calibration cycle is related to the use of the equipment. The calibration cycle can be determined by yourself, but at the same time, you should refer to the domestic metrology requirements (if your application is approved by CNAS). The equipment calibration cycle can be adjusted, but the premise is that you must give a reasonable basis after the adjustment, otherwise it will not be accepted during the review.

Should I ask the instrument and equipment company about the calibration?

The calibration company does not understand the frequency of use, maintenance, use environment and other factors of the equipment. The calibration cycle he sets for you may not be reasonable. For example, a steel ruler is well preserved and used two or three times a year; another steel ruler is placed casually on the workbench and used for 8 hours a day; the calibration cycle given by the calibration company must be once a year, so the calibration cycle of the first ruler is too short and the calibration cycle of the second ruler is too long, which may cause a misalignment of three to five months. Only for corporate laboratories, third-party metrology calibration laboratories have different requirements because they have to pass qualification certification, and many equipment may need certification.

What is the relationship between calibration cycle and cross-period verification?

The state stipulates that during the calibration period, equipment maintenance, key component replacement, instrument migration, etc. should be recalibrated. During the calibration period, the equipment should be checked to ensure the stability and accuracy of the equipment. If it is equipment, it refers to equipment rather than rulers, compasses, etc. The custom calibration cycle should be less than the cycle stipulated by the state.

The laboratory can customize the calibration cycle according to the characteristics of the instrument, the frequency of use, etc. As long as the equipment is in the correct state of use, it can achieve the expected use effect. It is usually necessary to provide measures such as regular verification to prove that the instrument is in good condition. However, the longer the calibration cycle, the better, because the longer the time, the worse the reliability.

Metrology calibration is an important part of improving laboratory efficiency. Determining the calibration cycle is a key part of metrology work and plays a very important role in product quality and service quality. When determining the calibration cycle of measuring instruments, the actual use of the measuring instruments should be scientifically analyzed and evaluated.