MOS transistor quality and polarity discrimination — SUNMATE

MOS transistor quality and polarity discrimination

Select the range of the multimeter at the RX1K gear, connect the black probe to the D pole and the red probe to the S pole, touch the G and D poles with your hand at the same time, and the Field-effect transistor should be in an instantaneous conduction state, that is, the needle should swing to the position with smaller resistance, and then touch the G and S poles with your hand, and the Field-effect transistor should have no reaction, that is, the needle should not move back to the zero position. At this time, it should be judged that the field effect tube is a good tube

Select the range of the multimeter at RX1K, and measure the resistance between the three pins of the Field-effect transistor. If the resistance between one pin and the other two pins is infinite, and it is still infinite after the probe is exchanged, this pin is G pole, and the other two pins are S pole and D pole. Then use the multimeter to measure the resistance between the S pole and D pole once, and measure again after the probe is exchanged, where the resistance is smaller once, and the black probe is connected to the S pole, The red lead is connected to the D-pole