1. Measurement verification and calibration are measurements that meet certain requirements. It is a detection activity used to verify the degree of deviation (error) between the measured value and the actual value (true value).

Reliability: The ability of an instrument to perform a specified function within a specified time and under specified conditions.

The higher the reliability, the better the quality of the product. Highly reliable products can work normally for a long time (this is what the company needs); in terms of terminology, the higher the reliability of the product, the longer the product can work without trouble (that is, the stability is good) .

2. The measurement performance (including product quality) such as the accuracy grade of measuring instruments is determined by the design and manufacturing processes. The production process has passed the relevant quantity to the instrument (the measurement standards at all levels are completed at the time of construction). The measurement of the quantity, the measuring instrument used in the factory, the verification, calibration is only a means to verify the eligibility, is to verify whether the instrument in use meets the original accuracy level of the measurement activities, the essence is to verify the degree of deviation from the error Reliability measurement.

3. The value transmission is to pass the measurement and calibration of the measuring instrument, and the unit quantity realized by the national measurement standard is transmitted to the measuring instrument through the measurement standards of each level to ensure the accurate and consistent measurement. Verification and calibration only serve as an evaluation function and cannot improve the measurement performance.

In short, the accuracy level of the measuring instrument is determined in the production process, and the value transmission is realized in the production, manufacturing and inspection of the measuring instrument. The metering activity in the use of measuring instruments is a reliability measure used to verify compliance with the original level requirements, and is no longer a value transfer activity.