Checking ---- by the legal metrology department or legally authorized organizations in accordance with the calibration procedures, through experiments, to provide proof to determine the measurement apparatus to meet the specified requirements of the error in the display value of the activity.
Calibration ---- under the specified conditions, in order to determine the indicated value of the measuring instrument or measurement system, or the indicated value represented by the physical gage or standard substance, respectively, using the higher precision of the calibration of the standard equipment and the measured equipment to test the same measured object, to get the measured equipment relative to the standard equipment error of a group of operations, so as to get the corrected value of the indicated value data of the measured equipment.
Calibration ---- in the absence of calibration or calibration procedures, the enterprise to prepare their own self-calibration procedures. Mainly used for specialized measuring instruments, or relatively low accuracy measuring instruments and test hardware or software.
Since the term calibration is also rarely used in the past few years, so focus on verification and calibration for introduction.
The difference between verification and calibration:
(1) different purposes
The purpose of verification is mandatory comprehensive evaluation of measuring devices. This comprehensive evaluation belongs to the scope of the unity of value, is the top-down value transfer process. The test should be assessed whether the measuring instrument meets the specified requirements.
This requirement is the measurement of measuring devices prescribed by the error range. Through the test, assess the error range of the measuring device is within the specified error range.
The purpose of calibration is to assess the error of the measuring device against the measurement standard to ensure the accuracy of the value, belonging to the bottom-up traceability of the value of a group of operations.
The evaluation of this error should be based on the organization's calibration procedures to make the corresponding provisions, according to the calibration cycle, and do a good job of calibration records and calibration marking.
(2) different objects
The object of verification is the measurement of China's metrological law clearly stipulates the mandatory verification of measuring devices. Verification of the object is mainly three categories of measuring instruments:
1. Measurement benchmarks (including international measurement benchmarks and national measurement benchmarks).
2. Measurement standards.
3. Measurement law provides for the inclusion of 59 kinds of measuring instruments in the catalog of compulsory inspection.
The object of calibration is a mandatory test outside the measuring device. China's non-mandatory calibration of measuring devices, mainly in the production and service delivery process of measuring instruments used in large quantities, including incoming inspection, process inspection and final product inspection of measuring instruments used.
(3) the nature of the different
The calibration is mandatory law enforcement behavior, belongs to the scope of legal measurement management.
Calibration is not mandatory, belonging to the organization of voluntary traceability.
(4) based on different
The main basis for verification is the "National Measurement and Certification Regulations" (JJG), which is the measurement of equipment must comply with the statutory technical documents. These regulations belong to the measurement of regulatory documents, the organization does not have the right to develop, must be approved by the authorized measurement department.
The main basis for calibration is the organization according to the actual need to develop their own "calibration specifications", or in accordance with the "National Measurement Technical Specification" (JJF) requirements.
(5) different ways
The calibration must be carried out to the qualified measurement department or a legally authorized unit. According to the status quo in China, most production and service organizations are not qualified for verification, only a few large organizations or professional metrology verification department has this qualification.
Calibration can be used to organize the way of self-calibration, external school, or self-calibration and external school combined.
Organizations in the case of conditions, you can use self-calibration of measuring instruments calibration, thus saving greater costs.
(6) the cycle of different
The verification cycle must be carried out in accordance with the provisions of the "verification regulations", the organization can not determine their own. The verification cycle belongs to the content of the mandatory constraints.
Calibration cycle is determined by the organization according to the need to use measuring instruments. Can carry out regular calibration, or irregular calibration, or calibration before use.
(7) the content of the different
The content of the verification is a comprehensive assessment of the measuring device, the requirements of a more comprehensive, in addition to including all the contents of the calibration, but also need to check the relevant items.
Calibration of the content and the project, only the evaluation of the measuring device value error, to ensure the accuracy of the value.
(8) different conclusions
The verification must be based on the "test procedures" specified range of error in the measurement value, to give the measurement device qualified and unqualified judgment. Exceed the "test procedures" specified range of error for the unqualified, within the specified range of error for the qualified. The result of the test is to give the "certificate of conformity".
The conclusion of the calibration is only to assess the measuring device of the measurement error, to ensure the accuracy of the measurement value, not required to give a qualified or unqualified judgment. The results of calibration can be given "calibration certificate" or "calibration report".
(9) the legal effect of different
The conclusion of the calibration has the force of law, as a measuring instrument or measuring device calibration of the legal basis for the "certificate of conformity" is a legally binding technical documents.
Calibration conclusions do not have the force of law, given the "calibration certificate" is only marked quantitative error, is a technical document.
From the above can be seen: verification, calibration, calibration of the three are not completely independent, in the verification and calibration are included in the calibration process, just whether to give the calibration results of the problem.