The method of triode measurement is actually very simple, sharing two measurement methods

BySipxmach

May 28, 2022

Many friends don’t know what a triode is or how to measure a triode. In fact, triodes are very common in our lives. In order to let you learn more knowledge, the following editor will introduce to you, let’s learn together. .

Many friends don’t know what a triode is or how to measure a triode. In fact, triodes are very common in our lives. In order to let you learn more knowledge, the following editor will introduce to you, let’s learn together. .

Triode measurement

What is a triode?

The triode is one of the basic components of semiconductors, which has the function of current amplification and is the core component of Electronic circuits. The triode is made of two PN junctions that are very close to each other on a semiconductor substrate. The two PN junctions divide the whole semiconductor into three parts. The middle part is the base region, and the two sides are the emitter region and the collector region. The arrangement is PNP and NPN.

How to measure with a multimeter triode:

1. Find the base and determine the tube type (NPN or PNP)

For the PNP type triode, the C and E poles are the positive poles of the two internal PN junctions, respectively, and the B pole is their common negative pole, while for the NPN type triode, it is just the opposite: the C and E poles are the two PN junctions, respectively. The negative pole, and the B pole is the positive pole they share. According to the characteristics of the PN junction with small forward resistance and large reverse resistance, it is very convenient to judge the type of the base and the tube. The specific method is as follows:

Set the multimeter to R×100 or R×1K. The red pen touches a certain pin, and the black test pen is used to connect the other two pins, so that three groups (two per group) of readings can be obtained. When one group of secondary measurements is a low resistance value of several hundred ohms If the common pin is the red test lead, the contact is the base, and the tube type of the triode is PNP; if the common pin is the black test lead, the contact is also the base, and the tube type of the triode is NPN .

2. Distinguish between emitter and collector

Since the doping concentrations of the two P regions or the two N regions are different when the triode is fabricated, if the emitter and collector are used correctly, the triode has a strong amplification ability. On the contrary, if the emitter and collector are used interchangeably, Then the amplification ability is very weak, so the emitter and collector of the tube can be distinguished.

After judging the tube type and base b, the following methods can be used to distinguish the collector and the emitter. Set the multimeter to R×1K. Pinch the base and another pin together with your hand (be careful not to let the electrodes touch directly), in order to make the measurement phenomenon obvious, you can wet your fingers and connect the red test lead to the pin that is pinched together with the base , the black test lead is connected to another pin, and pay attention to observe the amplitude of the multimeter pointer swinging to the right. Then swap the two pins and repeat the above measurement steps. Compare the magnitude of the hand swing to the right in the two measurements and find the one with the largest swing. For the PNP type triode, connect the black test lead to the pin pinched together with the base, repeat the above experiment, and find out the time when the needle swings greatly. For NPN type, the black test lead is connected to the collector and the red test lead is connected to the collector. is the emitter. For the PNP type, the red test lead is connected to the collector, and the black test lead is connected to the emitter.

Triode measurement

After reading the above, do you think the triode measurement method is actually very simple? We only need a multimeter, and then follow the above operation. You can try these two methods.

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