The purpose of instrument calibration is against the measurement standard, evaluation of the measurement device value error, to ensure that the value is accurate, belongs 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 instrument calibration cycle, and do a good job of instrument calibration records and calibration marking. Instrument calibration in addition to assessing the error in the display value of the measuring device and determine the relevant measurement characteristics, the results of instrument calibration can also be expressed as a correction value or calibration factor, specific guidance for the operation of the measurement process. For example, a machining organization to use calipers, calibration found with the measurement standard has been compared with O.2mm, this data can be used as a correction value, in the instrument calibration logo and records marked in the calibration of the value of the standard compared to the larger out of the O.2mm value. In the use of this measuring instrument (calipers) for the physical measurement process, minus O.2mm out of the corrected value of the measured value of the physical measurement. As long as the purpose of traceability can be achieved, a clear understanding of the measuring instruments of the value of the error, that is, to achieve the purpose of instrument calibration. The purpose of measurement and calibration is a mandatory comprehensive assessment of the measuring device. This comprehensive evaluation belongs to the scope of the unification of quantitative 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 the measurement device calibration specification of the error range. Through the measurement of verification, assessment of the measurement device error range is within the specified error range.
2 different objects
The object of instrument calibration is to belong to the mandatory calibration outside the measuring device. Mainly refers to the large number of measuring instruments used in the production and service delivery process, including incoming inspection, process inspection and final product inspection of measuring instruments used. Measurement verification is the object of China's measurement law clearly stipulates the mandatory verification of measuring devices, measurement and verification of the object is mainly three broad categories of measuring instruments. These are: 1. Measurement benchmarks, 2. [Measurement] standards, 3. The Chinese people *** and the State mandatory calibration of the work of measuring instruments 59 kinds of measuring instruments used for trade settlement, safety and security, medical and health, environmental monitoring.
3 different nature
Instrument calibration is not mandatory, belonging to the organization's voluntary traceability behavior. Metrological verification is mandatory law enforcement behavior, is the scope of legal measurement management.
4 based on different
The main basis for instrument calibration is the organization according to the actual need to develop their own "calibration specifications", or with reference to the "verification regulations" requirements. Measurement and verification of the main basis for the "National Certification Regulations.
5 different ways
Instrument calibration can be used in the organization of self-calibration, external school, or self-calibration and external school combined. Measurement calibration must be carried out to the qualified measurement department or legally authorized units.
6 cycle is different
Instrument calibration cycle by the organization according to the use of measuring instruments need to determine their own. Measurement verification cycle must be carried out in accordance with the provisions of the "verification regulations", the organization can not determine their own.
7 different content
Instrument calibration of the content and the project, only the evaluation of the measurement device value error to ensure the accuracy of the measurement of the content of the verification is a comprehensive evaluation of the measurement 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. The content of the calibration can be determined by the organization according to the needs of their own. Therefore, according to the actual situation, the verification can replace the approval, and instrument calibration can not replace the measurement of verification.
8 different conclusions
The conclusion of the instrument calibration is only to assess the measurement of the measuring device of the value of the error, to ensure that the value of the accurate, not required to give a qualified or unqualified judgment. Calibration results can be given "calibration certificate" or "calibration report". Measurement and verification must be based on the "test procedures" specified in the range of quantitative value error, to give a qualified or unqualified judgment of the measuring device. Out of the "test procedures" specified range of error in the measurement value is unqualified, within the specified range of error in the measurement value is qualified. The result of the measurement test is to give the "certificate of conformity".
9 different legal effects
Calibration conclusions do not have the legal effect of giving the "calibration certificate" is only marked with the quantitative value of error, is a technical document. Measurement of 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 of the calibration certificate "belongs to the legally binding technical documents According to" the Chinese people *** and the State mandatory calibration of the work of the measuring instruments calibration management approach "for trade settlement, safety and security, health care, environmental monitoring, are the implementation of mandatory calibration.