According to Article 41 of the Guidelines for the Operation of the Designation System of National Calibration Institutions, “a person who possesses or uses a measuring instrument periodically shall calibrate the measuring instrument to improve traceability between the national measuring standard and measuring instruments used in all areas of the national society. The subject and scope of application can be defined and operated in its own regulations.”

The reason for the calibration in the industrial field is that the test and measurement should be performed with a measuring instrument with acceptable accuracy. The accuracy at this time can be verified based on the tolerances required by the specification. This accuracy check is achieved by periodically comparing and calibrating with a higher standard. The object to be calibrated shall therefore be set on the basis of the reliability that the performance can be maintained within the tolerances required by the individual instrument.

Article 41 (2) of the Operating Instructions for the Designation of the National Calibration Institution, “A person who owns or uses a measuring instrument shall take into account the accuracy, stability, purpose of use, environment, and frequency of use of the measuring instrument when setting its own calibration cycle. It should be scientifically and reasonably established.
If it is impossible to determine its own calibration cycle scientifically and reasonably, the calibration cycle notified separately by the Director of Technical Standards shall apply mutatis mutandis.” However, the standard calibration cycle specified in the operating regulations is a calibration cycle that estimates the period during which the precision accuracy of the measuring instrument can be maintained when used under the most common circumstances. Standard calibration cycle is set for 590 measuring instruments in 40 measuring fields, but those who use or have measuring instruments in each industry should consider the accuracy, stability, purpose of use, environmental conditions and frequency of use of measuring instruments. The recommendation is to adjust.

This means that even in the same workplace, it is unreasonable to set the calibration cycle uniformly because the work environment, measurement range, and tolerance range of the measuring equipment in each department may be different. This is because it is preferable to set the period based on the data of the use of the measuring device and the measured values for each department during the period. Therefore, the most basic consideration should be the acquisition of past accumulated measurement data that is the basis of the period adjustment.