Calibration of Intelligent Electric Valve Positioner

I have been working on the instrument for more than a year, and there is an oxygen flow control valve, which uses a smart positioner. I didn't know how to verify it at the beginning. Because there are few problems, it is generally more accurate. Only recently did I find out how to calibrate correctly. Give 85% of the signal when calibrating, and then press down for three seconds to achieve automatic calibration. After calibration, it will stop automatically. Then you try again. I have been working on the meter for more than a year. There is an oxygen flow control valve, which uses a smart positioner. I didn't know how to calibrate it at first. Since there are few problems, it is generally more accurate. Only recently did I find out how to calibrate correctly. Give 85% of the signal when calibrating, and then press down for three seconds to achieve automatic calibration. After calibration, it will stop automatically. Then you try again, as long as 1% of the signal is applied, the regulating valve will also act.