1, different purposes.
The purpose of instrument calibration is to assess the measurement device against the measurement standard, the error in the value of the measurement device to ensure that the value is accurate, 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 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, through calibration and measurement standards found to have been compared with the larger out of 0.2mm, this data can be used as a correction value, in the calibration of the instrument marking and records marked in the value of the calibration of the value of the larger out of the standard compared to the value of 0.2mm. In the use of this measuring instrument (calipers) for the physical measurement process, minus 0.2mm out of the correction value, 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 a mandatory calibration outside the measuring device. Mainly refers to the production and service provision in the process of measuring instruments used in large quantities, including incoming inspection, process inspection and final product inspection of measuring instruments used. The object of measurement and verification is the measurement of China's measurement law clearly stipulates the mandatory verification of measuring devices, measurement and verification of the object is mainly three major categories of measuring instruments. These are:
①measurement benchmarks;
②[Measurement] standards;
3 Chinese people*** and the state compulsory verification of the work of measuring instruments 59 kinds of measuring instruments for trade settlement, safety and protection, medical and health, environmental monitoring.
3, different nature.
Instrument calibration is not mandatory, belonging to the organization's voluntary traceability. Metrological verification is a mandatory law enforcement, is the scope of legal measurement management.
4, based on different.
The main basis for instrument calibration is based on the actual needs of the organization to develop their own "calibration specifications", or refer to the "verification regulations" requirements. Measurement of the main basis for verification is the "National Certification Regulations".
5, different ways.
Instrument calibration can be used to organize the way of self-calibration, external school, or self-calibration and external school combined. Measurement calibration must be qualified to the measurement of the department or a legally authorized unit.
6, the 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, the content is different.
Instrument calibration of the content and the project, but only to assess the measurement of the value of the device error, in order to ensure the accuracy of the measurement of the content of the measurement of the comprehensive assessment of the 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 measurement 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 error of measurement, belonging to 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 technical documents with legal effect According to the "People's Republic of China *** and the State of mandatory calibration of measuring instruments calibration of the work of the management of the provisions of the trade settlement, safety and security, medical and health care, environmental monitoring, the implementation of mandatory calibration.