What is the difference and contact between the instrument, external work verification, calibration, and calibration?
Verification, calibration, and calibration are all static measurement processes that are carried out in cycles. The meanings are:
The verification ---- is arranged by the legal metrology department or the statutory authorization in accordance with the verification procedures, after experiments, to provide certificates to confirm that the indication error of the measuring instrument meets the requirements of the regulations.
Under the specified conditions, in order to confirm the indication value of the measuring instrument or measurement system, or the indication value represented by the physical measuring tool or the standard substance, the calibration ---- selects the standard equipment and the measured equipment with higher accuracy to test the same measured object, obtains a group of operations in which the measured equipment is compared with the standard equipment, and then obtains the correction value of the indication data of the measured equipment.
Calibration ---- self-calibration procedures prepared by enterprises when there is no verification or calibration procedure. It is mainly used for special measuring tools, or hardware or software for relatively low accuracy measuring instruments and experiments.
Difference Between Verification and Calibration:
(1) The intent is different
The intent of the verification is to carry out a mandatory comprehensive appraisal of the measuring equipment. This comprehensive identification of areas attributed to the value of the same value is a top-down process of value transfer. The verification shall identify whether the measuring equipment meets the specified requirements.
This requirement is to measure the size of the error specified in the equipment verification regulations. After verification, it is determined whether the error scale of the measuring equipment is within the specified error scale.
The intention of calibration is to identify the indication error of the measurement equipment according to the measurement specification, ensure the accuracy of the measurement value, and attribute it to a set of operations that trace the value from the bottom up.
The identification of such indication errors should be made in accordance with the calibration procedures arranged, carried out according to the calibration cycle, and the calibration records and calibration marks should be made.
(2) The goals are different
The target of verification is the measurement equipment for compulsory verification clearly stipulated in China's metrology law. The objectives of the verification are mainly three categories of measuring equipment:
1. Measurement standards (including world measurement standards and national measurement standards).
2. Metrological specifications.
3. The measurement law stipulates that 59 kinds of measuring tools are included in the compulsory inspection catalog.
The goal of calibration is to classify measuring equipment outside of the mandatory verification. China's non-mandatory verification of measuring equipment, mainly refers to a large number of measuring tools used in the process of production and service provision, including the measurement equipment used in purchase inspection, process inspection and final product inspection.
(3) Different in nature
The verification is a mandatory legal act and belongs to the field of legal measurement and management.
Calibration is not mandatory, but is a voluntary traceability arrangement.
(4) Depending on the difference
The primary basis for verification is the National Metrology Verification Regulations (JJG), which is a statutory technical document that must be adhered to for the verification of measuring equipment. These regulations are classified as metrological regulatory documents, and the arrangements do not have the authority to draw up, and it is necessary to be drawn up by the approved authorized metrology department.
The primary basis for calibration is to arrange the "Calibration Specification" drawn up according to the actual needs, or in accordance with the requirements of the "National Metrology Technical Specification" (JJF).
(5) The methods are different
It is necessary to carry out the verification to the qualified metrology department or the legally authorized unit. According to the current situation in China, most production and service arrangements do not have the qualification of verification, and only a small number of large-scale arrangements or professional metrology verification parts have this qualification.
The method of calibration can be carried out by arranging self-school, external school, or a combination of self-school and external school.
In the case of conditions, the self-calibration method can be used to calibrate the measuring equipment, and then save a large cost.
(6) The cycle is different
It is necessary to carry out the verification cycle in accordance with the provisions of the "Verification Regulations", and the arrangement cannot be confirmed by itself. The content of the verification cycle is subject to mandatory constraints.
The calibration interval is determined by the arrangement according to the needs of the measuring equipment used. It can be calibrated at a timed time, or at irregular intervals, or calibrated prior to use.
(7) The content is different
The content of the verification is a comprehensive appraisal of the measuring equipment, which requires a more comprehensive one, in addition to including all the contents of the calibration, it is also necessary to verify the relevant items.
The content and items of calibration only identify the indication error of the measurement equipment to ensure the accuracy of the measurement value.
(8) The conclusions are different
It is necessary to give a judgment of whether the measurement equipment is qualified or unqualified according to the scale of the measurement error specified in the "Verification Regulations". The scale of the error beyond the specified value of the "Verification Regulations" is unqualified, and it is qualified within the specified scale of the error of the value. The result of the verification is to give the "Certificate of Verification".
The conclusion of calibration only identifies the error of the measurement device, ensures the accuracy of the measurement, and does not require a pass or fail determination. The results of the calibration can be given as a "Calibration Certificate" or "Calibration Report".
(9) The legal effect is different
The conclusion of the verification has legal effect, which can be used as the legal basis for the verification of measuring appliances or measuring equipment, and the "Certificate of Conformity" is attributed to the technical documents with legal effect.
The conclusion of the calibration has no legal effect, and the "calibration certificate" given only indicates the error of the value and is attributed to a technical document.
From the above, it can be seen that the verification, calibration, and calibration are not completely independent, and the calibration process is included in the verification and calibration, and only the question of whether to give the calibration results is given.
Selection of verification, calibration, calibration
1. The inspection submitted to the national compulsory verification catalogue is mainly used in occasions with legal requirements. For example, the pressure gauge on the boiler of the enterprise should be sent for inspection regularly.
2. Outside the national compulsory verification catalog, but there are JJG specifications or JJF specifications, submitted for inspection or calibration, the enterprise has standardized equipment, appliances and calibration methods, and can carry out self-calibration. It is mainly used in places where the accuracy requirements are high, or the conditions are limited, and it is necessary to use lower accuracy measuring tools for higher measurement requirements, which is a common method used by enterprises, such as the calibration of most appearances on production equipment.
3. If there is no JJG specification or JJF specification, verify it by yourself. It is mainly used in situations where there is no verification procedure or where it is impossible to completely meet the requirements of the regulations but can be satisfied with the application requirements. This is also a common method used by enterprises.
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