1. Measurement of action distance: When the action piece approaches the sensing surface of the proximity switch from the front, the action distance of the proximity switch should be the maximum action distance of the proximity switch, and the measured data should be within the parameters of the product.

2. Measurement of release distance: When the action piece leaves the sensing surface of the proximity switch from the front and the switch changes from action to release, measure the maximum distance between the action piece and the sensing surface.

3. Determination of return difference H: the absolute value of the difference between the maximum operating distance and the release distance.

4. Action frequency measurement: drive the bakelite disc with a speed regulating motor, fix several steel plates on the disc, adjust the distance between the switch sensing surface and the action piece, which is about 80% of the switch action distance, and rotate the disc to make the action piece close to the switch in turn. The rotating speed measuring device is installed on the spindle of the disc, and the output signal of the switch is connected to the digital frequency meter after shaping. At this time, start the motor and gradually increase the speed. When the product of the speed and the action piece is equal to the frequency count, the action frequency of the switch can be directly read by the frequency meter.

5. Repeatability measurement: fix the action piece on the measuring tool, approach the action area of the switch from the front of the switch sensing surface, which exceeds 120% of the switch action distance, and control the moving speed to be 0. 1mm/s/s ... When the switch acts, read the reading on the measuring tool, and then exit the action area to close the switch. This is repeated 10 times. Finally, calculate the difference between the maximum and minimum values of 10 and the average value of 10. The biggest difference is the repeatability error.