Checking meaning
Measured by the legal system of measurement departments or legally authorized organizations in accordance with the verification procedures, through experiments, to provide proof to determine the error in the value of measuring instruments to meet the specified requirements of the activities.
Calibration meaning
In the prescribed conditions, in order to determine the value of measuring instruments or measurement systems, or physical gages or standard substances represented by the value, respectively, using the higher accuracy of the calibration of the standard equipment and equipment to be measured by the same measured object to test, get the measurement of the equipment relative to the standard equipment error of a group of operations, so as to get the value of the measurement of the equipment data Correction value.
The main difference between calibration and verification
1, the purpose of different
The purpose of calibration is to measure the standard, assess the measurement device error, to ensure the accuracy of the measurement value, belong to the bottom-up traceability 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 make a good record of calibration and calibration marking. Calibration in addition to the evaluation of the measurement device and determine the error of the measurement characteristics, calibration results can also be expressed as a correction value or calibration factor, specific guidance for the operation of the measurement process.
The purpose of the verification is a mandatory comprehensive evaluation of the measuring device. This comprehensive evaluation belongs to the scope of the unification of quantitative values, is a top-down process of transmission of values. Verification should be assessed whether the measuring instrument meets the specified requirements. This requirement is the measurement of the measurement device calibration specification of the error range. Through the verification, assessment of the measuring device error range is within the specified error range.
2, the object of different
The object of calibration is a mandatory calibration outside the measuring device. China's non-compulsory calibration of measuring devices, mainly in the production and service delivery process using a large number of measuring instruments, including incoming inspection, process inspection and final product inspection of measuring instruments used.
The object of verification is the measurement of China's metrological law clearly stipulates the mandatory verification of measuring devices. The People's Republic of China *** and the State Measurement Law "Article IX clearly stipulates: the people's government at or above the county level measurement of the administrative departments of the public measurement of standard instruments, departments and enterprises, institutions, the use of the highest measurement of the standard instruments, as well as for trade settlements, safety and security, medical care, environmental monitoring included in the mandatory inspection of directory of the work of the measuring instruments, the implementation of mandatory verification. Not in accordance with the provisions of the application for verification or unqualified verification, shall not be used.
Therefore, the object of verification is mainly three categories of measuring instruments. These are:
1. Measurement benchmarks (including international [measurement] benchmarks and national [measurement] benchmarks) ISO 10012-1 "measurement and testing equipment quality assurance requirements" to make the definition.
2. [Measurement] standards ISO 10012-1 standard defines "measurement" standards as: used to define, achieve, maintain or reproduce the unit or one or more known quantities, and by comparison to transfer them to other measuring instruments of the physical gage, measuring instruments, standard substances or systems.
3. China's Measurement Law and the Chinese people **** and the State mandatory verification of the work of measuring instruments Detailed regulations: Where used for trade settlement, safety and security, medical and health care, environmental monitoring, the implementation of mandatory verification. In this detailed catalog, has clearly stipulated 59 kinds of measuring instruments included in the scope of mandatory verification. It is worth noting that this "detailed directory" of the second paragraph clearly emphasizes that the catalog items, where used for trade settlement, safety and security, medical and health care, environmental monitoring, are subject to mandatory verification. This is the requirement to include 59 kinds of measuring instruments in the directory, only for trade settlement and other four types of measuring instruments in the field, belong to the scope of mandatory verification. For the 59 kinds of measuring instruments included in the catalog, but the actual use is not for trade settlement and other four types of measuring instruments in the field, may not belong to the scope of mandatory verification.
The above three categories outside the measuring device is non-compulsory verification, that is, the scope of calibration.
3, the nature of the different
Calibration is not mandatory, belonging to the organization's voluntary traceability behavior. This is a technical activity, according to the actual needs of the organization, the evaluation of measuring instruments, the error of the value of measuring instruments or standard substances for the process of fixing the value. Organizations can specify the calibration specification or calibration method according to the actual needs. Self-regulation of calibration cycle, calibration marks and records.
Checking belongs to the mandatory law enforcement behavior, belongs to the scope of legal measurement management. Which the calibration protocol agreement cycle and so on all in accordance with the statutory requirements.
4, based on different
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. In the "calibration specification", the organization stipulates its own calibration procedures, methods, calibration period, calibration records and marking requirements. Therefore, the "calibration specification" belongs to the organization to implement the calibration of the guiding documents.
The main basis for verification is the "National Measurement and Testing Regulations" (JJG), which is the measurement of equipment verification must comply with the statutory technical documents. Which, usually on the measurement of testing equipment verification cycle, measurement characteristics, test items, test conditions, test methods and test results, etc. to make provisions. Measurement verification regulations can be divided into national measurement verification regulations, departmental measurement verification regulations and local measurement verification regulations. These regulations belong to the measurement of regulatory documents, organizations do not have the right to develop, must be approved by the authorized measurement of the department to develop.
5, different ways
Calibration can be used in the organization's self-calibration, external school, or self-calibration and external school combined. Organization in the case of conditions, you can use self-calibration of measuring instruments for calibration, thus saving greater costs.
Organizations to carry out self-calibration should pay attention to the necessary conditions, rather than relaxing the requirements of the management of measuring instruments. For example, must be prepared to calibrate the specification or procedure, the calibration cycle, with the necessary calibration environment and have a certain quality of measurement personnel, at least one level higher than the standard measuring instruments, so that the calibration of the error is as small as possible (in most areas of measurement, the standard measurement error should be no more than the confirmed equipment in use 1/3 to 1/10 of the error is good).
In addition, provisions should be made for calibration records and marking. Through the above provisions to ensure that the measurement value is accurate.
The calibration must be carried out to the qualified measurement department or legally authorized unit. According to the status quo in China, most production and service organizations are not qualified for calibration, only a few large organizations or professional metrology and calibration departments have such qualifications.
6, the cycle is different
Calibration of the cycle by the organization according to the need to use measuring instruments to determine their own. Regular calibration can be carried out, but also irregular calibration, or calibration before use. Calibration cycle should be determined by the principle of minimizing the risk of measuring equipment in use at the same time, to maintain minimum calibration costs. Can be based on the frequency of use of measuring instruments or the degree of risk to determine the period of calibration.
The cycle of calibration must be carried out in accordance with the provisions of the "calibration regulations", the organization can not determine their own. The verification cycle is a mandatory binding content.
7, the content of different
Calibration of the content and the project, only to assess the measurement device of the error in the value to ensure that the value is accurate.
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.
For example, a measuring instrument verification content should include the technical conditions of measuring instruments, verification conditions, verification items and verification methods, verification cycle and the disposition of verification results and other content. The content of calibration can be determined by the organization itself according to the needs. Therefore, according to the actual situation, the verification can replace the approval, and calibration can not replace the verification.
8, different conclusions
The conclusion of the calibration is only to assess the measuring device of the error in the measurement value, to ensure that the value is accurate, do not require a qualified or unqualified judgment. The results of calibration can be given "calibration certificate" or "calibration report".
The test must be based on the "test procedures" specified in the range of error in the value of the measuring device to give a qualified or unqualified judgment. Out of the "test procedures" specified range of error in the measurement value for failure, within the specified range of error in the measurement value is qualified. The result of the test is to give the "certificate of conformity".
9, the legal effect of different
Calibration conclusions do not have the legal effect of giving the "calibration certificate" is only marked with the error of measurement, belongs to a kind of technical documents.
The conclusions of the calibration has the force of law, can be used as a measuring instrument or measuring device calibration of the legal basis for the "certificate of conformity" is a technical document with legal effect.
This article is from: measurement calibration network
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The difference between verification and calibration.