There are three possible situations for the recommended calibration interval of measuring instrument calibration:
First, if calibration is carried out with reference to the metrological verification regulations, it is suggested that the calibration interval should be carried out according to the verification period specified in the metrological verification regulations;
The second is to calibrate according to JJF calibration specification, and implement it according to the recalibration interval specified in the calibration specification;
Third, whether to calibrate according to product standards or product technical conditions.
According to JJF 1 139-2005 Principles and Methods for Determining Verification Period of Measuring Instruments and the document number. Bureau of Quality and Technical Supervision JJF [2000] 182, the usual practices of legal metrological technical institutions can be summarized as follows:
The verification period (validity period) of measuring instruments shall be implemented according to the verification period stipulated in the metrological verification regulations, and the verification personnel shall not adjust it at will; The customer requested to shorten the time interval, considering that the implementation period is the longest verification period allowed by the regulations.
And customers may use it frequently, so they can agree to their request to shorten the time interval. If the customer requests to extend the verification period, the seriousness of metrological verification regulations shall be explained to the customer according to the requirements of DocumentNo.. Bureau of Quality and Technical Supervision [2000] 182, which shall not be extended.
Refer to the above content: Baidu Encyclopedia-Concrete Digital Rebound Instrument