MOS tubes are also a type of semiconductor, and such devices are called symmetrical. Because they are more common and smaller in size, they can replace bipolar crystals in many places. Although it is also a long-effect transistor, it is also a controlled electronic component. It looks like a triode. In fact, the principle is completely different. It is also often used in switching circuits and mainly works based on potential.

The role of the MOS tube is still very obvious. It is not only used for magnifying glasses, but also does not need to use motor capacitors when using it. After all, its own impedance is still very high. In addition, when faced with many levels of amplification circuits, the effect is still very good. And it can not only be used as an electronic switch, but also a variable resistor, so the use effect is still very obvious.
The internal charge of the MOS tube must be discharged before measurement, that is, the three pins can be connected together with iron wires, so that the internal charge can be removed, and it can also ensure that it is in a closed state. After all, this kind of measurement is very simple. As long as you use the diode measurement range, you can better measure its quality through the unidirectional conductivity of the diode.
It is not that simple to check this MOS tube. Although when the diode gear is adjusted and the S level and D level are detected respectively, then one of them must be in the cut-off state, and one of them has a digital display, which can be determined to be normal. However, if the two measurements show 1, then there is an open circuit. If both have digital displays, it means breakdown. Why it can be detected is precisely because there is a voltage between the test leads of the two multimeters through this unit, so there will be continuity and cutoff during detection, so it can be detected. Of course, you can also use the resistance level to measure it, or the buzzer level to measure it. If there is a breakdown, the buzzer will sound or the resistance level will have a resistance display, which can better judge its quality.

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