The abbreviation of silicon controlled thyristor is SCR, also known as thyristor. Its advantages are long life, high efficiency and small size. It looks like a triode. In automatic control systems, it can achieve smaller power and control high-power equipment. It can be widely used as a speed control system. In this automatic control process, it is also widely used in industrial motors. It is an active switching component that remains disconnected in normal conditions.

SCR is the abbreviation of silicon controlled rectifier. It is a device composed of three PN nodes and three electrodes. So when judging One way to determine the quality of a thyristor is that if it is a one-way thyristor, use electricity to block it, and then randomly measure the forward and reverse resistances between the two pins until the resistance value is about 10 ohms. Then you can find out its control. That is, the pin that the black test pen contacts is the control electrode, then the red The pin that the test lead contacts is the cathode, and the remaining empty pin is the anode. When measuring, the red goldfish is connected to the black electrode and the black one is connected to the anode. When the anode and the control electrode are short-circuited with a short wire, the meter needle should be around 15 ohms to the right. If the black test lead is connected to the a pole and the red test lead is connected to the cathode, if the pointer deflects, it means that it has been broken down.
If it is a triac, then there must be two sets of infinite resistance measured by these three pins separately, and only one set is about 15 mu. Then the red meter is connected to the anode, and the black is the control pole. Then the vacant pin is the anode. As long as the functions of several of the pins are judged, and then the resistance value can be measured continuously through the ohm setting of the multimeter, you can know what it is and judge. The quality of the thyristor means breakdown or short circuit, these are the two situations, so you can know what the thyristor is like by measuring it carefully. Although it is somewhat different from judging the quality of a triode, as long as you measure it carefully, you can make a correct judgment.

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