万用表测三极管(国外英文资料).docVIP

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万用表测三极管(国外英文资料)

万用表测三极管(国外英文资料) Diode test method: The first assumption is negative, Black is negative then. Reading a large and a small (large, close to infinity; small junction positive resistance to thousands of hundreds of Europe Europe) If the establishment of hours. (Hei Zhenghong) NPN transistor test method (PNP black and red pen on): Assuming a base, Pick up a black pen. The other two red pen, Small is established. (including PN positive resistance) The conclusion should be three: The type of material and base. C hypothesis, Black C red E. B, C bias, The most suitable finger. If the resistance is small, That is the establishment of. Type refers to a NPN or PNP; Material means material; The base means base. This is a must to export six sentences for the base, seven to twelve words for diversity and emitter electrode. The metal shell encapsulation (TO - 3) the ordinary thyristor, the shell for anode A. Plastic (TO - 220). The ordinary thyristor as the anode A, and comes with the heat sink is connected. Figure 8-15 for several common thyristor pinout. 2. determine the reverse resistance which is using a multimeter between R * 1K gear measuring common anode A and the cathode of the K transistor, normally should be infinite (infinity) if the measured A and K between positive and negative resistance value is zero or resistance smaller, the thyristor internal short circuit breakdown or leakage. The forward and reverse measure the resistance between gate and cathode of the K G value of normal reverse resistance should be similar to the value of the diode (the actual measurement results are compared with the ordinary diode reverse resistance value, namely small) positive resistance value is small (less than 2 K), reverse resistance value is large (greater than 80 K.). If the two resistance measurements are large or are very small, the thyristor G, K pole between open circuit or short circuit. If the positive and negative resistance values are equal or close to the failure of the thy

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