Turn on the power of the multimeter and set the multimeter to the continuity test position. The test multimeter displays 1, indicating that the test leads are disconnected. Place the pointer of the multimeter, one wire is gently placed on the wire-in end of the switch terminal, and the other wire is lightly placed on the wire-out end of the switch terminal. If the display is 0, it means that the two terminals are connected to the normal terminal. close. At this time, we keep the terminal still, slightly press the micro switch, and observe the universal indicator at this time, it becomes 1, which means that the switch is connected to the line, indicating that the micro switch is normal. In the same way, we test the other two wiring terminals of the micro switch, as shown in the figure: When no pressure is applied to the micro switch, the display is 1, indicating that the two terminals are normally open.