判断三极管的好坏（Judge the quality of a triode）.docVIP

判断三极管的好坏（Judge the quality of a triode） Digital multimeter quality detection method of transistor are as follows: 1, find out the base: the digital multimeter in the diode file, the red pen connected with a pin with the black pen in contact with another 2 pin, if the 2 display values were less than 1V or show the overflow symbol 1 is the red pen the pin is the base of B. If in the 2 test, a display value is less than 1V, another display overflow symbol 1, indicated that the red pen connected to the pin is not the base, then switch to the other pin to measure, find the base. 2, to determine the type, the digital multimeter in the diode file, the red pen is connected with the base electrode of the boudoir, with the black pen has contact with other 2 pins, if that 0.5V to 0.8V, is the test tube belongs to NPN type, if the 2 show overflow symbol 1, indicates that the measured tube belongs to PNP tube. 3, distinguish collector C and emitter e, take NPN tube as an example, put Digital Multimeter in HFE file, use PNP jack. The base B is inserted into the B hole, and the remaining 2 pins are inserted into the C hole and the E hole respectively. If the measured HFE is from tens to hundreds, it shows that the tube is a normal connection method, and the amplification capability is strong. At this point, the C hole is inserted into the collector C, and the E hole is inserted into the emitter E. If the measured HFE value of only a few dozen or, that measured the collector and emitter c e insert, then C is hand hole emitter e, E hole is the collector of C, in order to make the results more reliable, can be inserted in the B B fixed base hole, the collector C with the emitter e exchange re test 2 times, to show the value of a subject, the C pin hole is C E hole collector, the pin is emitter E. 4, test good or bad. Take the NPN model for example. Open the base B to measure the resistance between the c\e poles. Table with red pen receiving shot by 000, the black pen is connected wit