万用表最全使用方法（The most comprehensive use of a multimeter）.doc

万用表最全使用方法（The most comprehensive use of a multimeter） We can use the R * 10 or R * 1 files of the multimeter to measure the quality of the PN junction in the road. In road measurement, measurement of positive and negative should have obvious characteristics of PN junction with R * 10 ohm (if it is not too obvious reverse resistance, can be used to measure the R * 1 ohm), generally positive resistance in R * 10 ohm measurement when the hands should be instructed in 200 ohm, R * 1 ohm measurement should be instructed in hand 30 ohm (according to the different phenotypes may be slightly different). If the measurement results are too positive or reverse resistance is too small, it shows that the PN junction is a problem, the tube will be a problem. This method is especially effective for maintenance, and it can be used to find out the broken pipes very quickly and even to detect tubes that have not been completely damaged but have deteriorated properties. For example, when you use a small resistance measuring deflection of PN junction forward resistance is too large, if you put it down with the welding commonly used R * 1K ohm test, may be normal, in fact, characteristics of this pipe has gone bad, can not work normally or unstable. 4, measuring resistance: it is important to choose the measuring range, when the pointer is indicated in the 1/3 to 2/3 full scale, the measurement accuracy is highest, the reading is most accurate. It should be noted that when using a R * 10K resistor to measure the large ohm resistance at the euro point, the fingers can not be pinched at both ends of the resistor, so that the resistance of the body will make the measurement result smaller. For the large imported plastic hose, the C is mostly in the middle (I havent seen B in the center yet). Medium and small power tubes, some B, most likely in the middle. For example, the commonly used 9014 transistor and other models of its series, transistors, 2SC1815, 2N5401, 2N5551 and other transistor