As a mechanical part, the electric screwdriver can not work normally without the power supply of the electric screwdriver, which provides energy and related control functions for the electric screwdriver. Drive the motor to rotate. Because the parameters of the electric screwdriver motor are different, the speed will be different when the power supply of the electric screwdriver outputs the same power.

The electric screwdriver shall be powered on and operated for one minute. When it is operated, it shall be held by hand. The hand shall not feel any abnormal vibration obviously. Observe the reversing spark. The reversing spark shall not exceed 3/2 level. Generally, when viewed from the air inlet of the electric screwdriver, there shall be no obvious arc light on the surface of the commutator. There shall be no abnormal noise during operation.