Triode with multimeter ohms how to measure the b pole, c pole and e pole how to judge simply

Pointer multimeter measurement: Place the file into"r × 100"or"r × lk", the black pen is connected to any pin of the transistor, the red pen and the other two pins, if the resistance value measured twice is small, this pin is the base. The other two measurements have a small resistance for the emitter.

The digital measurement is the same as the pointer.

Here's how to judge.

Test with an analogue multimeter:

1. Measure the B pole first

1) Contact one foot of the triode with any table pen, and measure the other two feet until the two groups of resistance values are basically consistent (generally the block is about 2k); At this time, the pole b. (2) If the contact pen is a red pen, then the transistor is a germanium tube (P); If the pen is black, then the transistor is a silicon tube (N); 2. Find C and E:

After the B garbage is determined, the table pen is lapped on the other two poles: connect a 10 thousand ohm resistor to the B pole and any pole, the resistance should not be connected first, put the watch pen on the two stages, and then the resistance will be contacted, the greater the pointer swing proves that the greater the amplification factor of the tube, that is to say, the better the tube, and the worse it is. The end of the resistor is the C pole; If the red pen is the P tube, the black pen is the N tube.

Use a multimeter to determine the type of transistor and the three electrodes.

1. Judge the quality of the diode

First of all, adjust the multimeter to the RX100 or RX1K file (you should be careful not to use the RX1 or RX10K file, because the current of the RX1 level is larger, and the voltage of the RX10K level is high, and the diode is easy to be damaged), and then use two meter pens to measure the forward and reverse resistance values of the diode. Generally, the forward resistance of the diode is about tens to hundreds of ohms, the reverse resistance is about hundreds to hundreds of kiloohms, the forward and reverse resistance of the diode is very different, indicating that the diode is good, if the forward and reverse resistance is similar, it means that the tube is broken, if the forward and reverse resistance is small or even zero, it means that the tube has broken down, if the forward and reverse resistance is very large, it means that the tube has been disconnected and can not be used.

2. Judgment of polarity.

When the measured resistance value is small, the electrode connected to the red pen (connected to the negative pole of the battery in the meter) is the negative pole of the diode, and the electrode connected to the black pen (connected to the negative pole of the battery in the meter) is the positive pole of the diode.

Conversely, when the measured resistance is large, the electrode connected to the red pen is the positive pole of the diode, and the electrode connected to the black pen is the negative pole of the diode.

Using the resistance level of the multimeter can judge the quality of the diode.

The specific method is to touch the two ends of the diode with the two stylus of the multimeter.

The forward and reverse resistance are measured separately.

The reverse resistance should be infinite, and the forward resistance should be smaller, so that's good.

First of all, select the multimeter to the resistance gear k ohm, connect the two ends of the diode to both ends of the pen, if the meter pointer does not move, the red pen is the positive pole, and the black pen is the negative pole. If the needle is pointing (about 2k), then the black pen is the positive pole, the red pen is the negative pole, and the diode is good. If the pointer is pointing to the right (fullness) no matter how it is measured, or it does not move, it means that the diode is broken.

Yes, it can be retested, measured with a mechanical watch, but I want to bai

The measurement and quality judgment standard of the transistor pin and its structure.

How to judge the quality and polarity of the transistor.