In general, instrument calibration should meet the following basic requirements:
1) Environmental conditions: If the calibration is carried out in the calibration (calibration) room, the environmental conditions should meet the temperature and humidity requirements of the laboratory. If the calibration is carried out on site, the environmental conditions shall be subject to the conditions for the on-site use of the instrument.
2) Instrument: As the standard instrument for calibration, the error limit should be 1/3~1/10 of the error limit of the calibration.
3) Personnel: Although the calibration is different from the verification, the personnel who perform the calibration should also be effectively evaluated and obtain the corresponding certificate of conformity. Only the certificate holder will issue a calibration certificate and calibration report, and only such certificates and reports will be issued. It is considered to be effective.
The calibration and verification of the instrument are the same:
Calibration and verification are two different concepts, but there is a close relationship between the two. Calibration is generally performed by comparing a metering instrument (referred to as a standard instrument) with a higher accuracy than the school metering to determine the indication error of the metering instrument, and sometimes including some metering performance, but often The calibrated measuring instrument only needs to determine the indication error. If the calibration is the verification content of the indication error in the verification work, it can be said that it is part of the verification work, but the calibration cannot be regarded as the verification. Moreover, the calibration does not require the condition. The verification is so strict that the calibration can be carried out at the production site and the verification must be carried out in the calibration room.
Some people understand calibration as the process of adjusting the measuring instrument to the specified error range, which is not clear enough. Although it can be adjusted during the calibration process, the adjustment is not equal to the calibration.
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