During the certification review process, some auditors often ask the auditee for deviations from the standard. One of the obvious manifestations is that the concepts of calibration and verification cannot be distinguished. For example, according to the actual needs and the regulations of China's legal metrology management, the organization's measuring device can meet the requirements through calibration, while the auditor has issued a “no-test†non-conformity report, forcing the organization to implement control according to the verification, and mandatory The organization is required to go to the professional measurement department for verification, which has caused great economic losses to the organization.
ISO1OO12—1 “Quality Assurance Requirements for Measurement and Testing Equipment†standard defines “calibration†as:
"A set of operations for determining the relationship between the indication of a meter or measurement system or the value of a physical gauge or standard substance and the corresponding measured known value under specified conditions.
Note:
1. Calibration results can be used to assess the indication error of a meter, measurement system or physical gauge, or to assign a value to a marker on any scale;
2. Calibration can also be used to determine other metering characteristics;
3. Calibration results can be recorded on documents sometimes referred to as calibration or calibration reports; 4 Sometimes approval results are expressed as corrections, calibration factors, or calibration curves.
ISO/IEC Guide 25-199O "General Requirements for the Technical Capabilities of Calibration and Inspection Laboratory" defines "certification" as:
“Proof of evidence to verify compliance with regulatory requirements (ISO 84O2/DADI—3.37, added notes for the purposes of this guide).
Note:
1. In order to interface with the management of the measuring instrument, the purpose of the verification is to verify the deviation between the indication value of the measuring instrument and the corresponding known quantity, so that it is always smaller than the standard, procedure or specification for the management of the measuring instrument. The maximum allowable error specified.
2. A decision to continue using, investigating, repairing, downgrading, or declaring a meter based on the results of the verification. In any inert condition, when the verification is completed, the verification shall be recorded on the special record of the measuring instrument. '
The definition given by the International Metrology Organization for verification is:
“A procedure for ascertaining and confirming the compliance of a measuring instrument with statutory requirements, which includes inspection, marking and/or issuing a certificate of verification.â€
According to the above definition, it can be seen that there is an essential difference between calibration and verification. Calibration and verification should not be confused, nor more equated. The main differences between the two are discussed below.
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