Metrological validation is a set of operations required to ensure that a measuring device meets the requirements for its intended use. Through regular evaluation of the performance of measuring instruments, compared with the use of the requirements for verification, to ensure that the measuring instruments comply with the requirements of the measurement management system. Metrological validation consists of two phases, design and implementation, to ensure that the measurement equipment meets the requirements of the intended use. Measurement confirmation interval may be the time interval, may also be the number of use interval.
Introduction:
Methods of metrological confirmation:
(1) Calibration process of measuring equipment
Inputs are the calibrated measuring equipment and the previous level of standardizer. The output is the calibration result and the sign of calibration status. The activity is calibration, i.e., comparison of the calibrated measuring equipment with the previous grade standardizer. Resources are calibration personnel, calibration methods, environmental conditions for calibration, etc.
(2) The process of deriving measurement requirements
The input is the customer requirements and the output is the measurement requirements. Activities are: find customer requirements (contract to find out), or from the product standards, technical requirements to find out, or from the production process control documents to find out, or from other legal provisions, norms or documents to find out.
(3) Validation process
The validation process has two inputs, one is the measurement requirements, and the other is the measurement characteristics of the measuring equipment. Its output is a validation certificate, or can not be verified, or does not meet the metrological requirements of the validation conclusions. Its activity is to compare the measurement requirements with the measurement characteristics. Its resources are comparing personnel information, etc. This process generally does not require hardware such as measurement equipment.
(4) Adjustment or repair process
If the calibration results can not meet the metrological requirements, the measurement equipment will have to go through the adjustment or repair process. The input to the adjustment or repair process is an output of the validation process: a validation conclusion that does not meet the metrological requirements. The output is an adjustment or repair report. The activity is the adjustment or repair. The resources are the equipment, facilities, personnel, methods, etc. of the adjustment or repair.
(5) recalibration (or review) process
Input is: adjusted or repaired measurement equipment and its report. The outputs are certificates and marks of recalibration status. The activities are calibration and the review of calibration intervals prior to calibration. Resources are measurement standard devices for recalibration, personnel, calibration specifications, etc.
(6) Labeling process for confirmatory status marks
There are two types of confirmatory status marks***: a confirmatory conformity mark and a confirmatory failure mark (unable to be repaired or adjusted). The input to the process is the verification/confirmation document, or the verification failure record. The output is a Confirmation of Conformance Mark, or a Confirmation of Failure Mark. The activity is to pick up the mark and post or hang it on the measurement equipment. Resources are personnel, registration, and other documents.