What is the easiest way to tell if a thyristor is good or bad?

For one-way thyristors, use the R 1 gear of the pointer meter to find out the two feet that are not passable, and the remaining leg must be the control pole. The red pen and the black pen of the pointer universal table, connect the two levels that do not pass, and the short circuit of the control pole and the foot of the black pen will rotate the indicator at a certain angle. Detach the control pole from the black pen, and if you keep the pointer moving, the black pen will be connected to the anode, and the red pen will be connected to the cathode.

The biphasic thyristor detection is the same, except that it can be triggered positively or negatively, that is, the table pen can be triggered no matter how it is connected.

The principle of measurement is to simulate the state of the thyristor being triggered to conduct, when it is not triggered, it is not on, and after it is triggered, it is triggered to be withdrawn, and it can remain conductive. Note that the R 1 gear of high current must be used, otherwise after the thyristor is turned on, the current will not reach the extent that it can continue to be maintained, and the trigger signal will be withdrawn, and the thyristor will not be able to maintain the continuous conduction, and no judgment can be made.

It can be judged by the method of an analog universal meter. Unidirectional thyristor, three poles, two poles have diode characteristics between them, and the rest is infinite for these two poles. The two poles of the triac have forward and reverse resistance, but the difference is a few ohms, and the remaining pole pairs are actually two infinity.

It is good to meet the above. Otherwise, it's bad.

A thyristor, short for thyristor rectifier element, is a high-power semiconductor device with a four-layer structure of three PN junctions, also known as a thyristor. It has the characteristics of small size, relatively simple structure and strong function, and is one of the more commonly used semiconductor devices.

The device is widely used in various electronic equipment and electronic products, and is mostly used for controllable rectification, inverter, frequency conversion, voltage regulation, non-contact switching, etc.

When judging with a multimeter, first connect the two pen pens of the multimeter to the two end faces of the thyristor, and the resistance should be infinite (the watch hand is basically unchanged), and then the pen is the opposite. If the resistance is low during these two steps, the controllable is damaged.

Otherwise, the following measurements are made: then connect the black watch pen (the battery + in the table) to the control electrode (the lead wire in the middle), and the red watch pen (the battery in the table -) to the anode (an end face far away from the control pole), at this time it should show a large resistance, and then measure the watch pen in reverse, and the resistance value should still be very large (the watch hand is basically not moving).

Then connect the black watch pen (Pafeng volt meter battery +) to the control electrode (the middle lead-out), and the red watch pen (the battery in the table -) to the cathode (from the control pole (the middle lead-out wire) is closer to an end face), at this time the resistance should be tens of hundreds of ohms, and then the watch pen is measured in reverse, and the resistance value should be slightly larger than the last measurement (the difference may not be obvious). If the test result is as described above, it means that the thyristor is good, otherwise the thyristor is damaged.