Although the verification period is given in the verification regulation, there is no guarantee that the technology of measuring equipment can always remain within the validity period. To this end, the laboratory accreditation criteria put forward intermediate verification (intermediate
Checks) is also called in-serve in Guide 25.
Verification), in the verification process, refers to using a simple, practical and reliable method to verify some parameters of measuring equipment or reference standards, benchmarks, transmission standards or working standards, and reference materials (reference materials) that may cause disqualification in two adjacent calibration time intervals, so as to maintain the credibility of the equipment state, that is, to confirm that the characteristics of the last calibration remain unchanged.
The purpose of interim verification is to find out the inaccuracy of measuring equipment and reference standards in time and shorten the traceability time after inaccuracy. When the deviation is found, the experiment can take appropriate methods or measures to reduce the cost and risk caused by the failure of equipment calibration status as much as possible, and effectively safeguard the interests of laboratories and customers.
Generally according to the actual situation of the laboratory.
First of all, follow the instructions, as our friend said above.
1, instruments and equipment with high frequency and large drift;
2, instruments and equipment in use, there are suspicious phenomena;
3, when the data statistics found bad trends, the equipment should be included in the scope of verification.
If the laboratory is convenient.
In the meantime, you can check the equipment used. You don't have to do what is required by the program file, and you don't have to do what is not required.