&Nbsp&Nbsp; Detect the VD quantity twice, and keep in mind the resistance value&Nbsp&Nbsp; When the resistance value is small, red is connected to negative, which is called the positive resistance value&Nbsp&Nbsp; The positive resistance is generally several thousand ohms, and the smaller the resistance value, the better&Nbsp&Nbsp; The reverse measurement has a high resistance, and the red pen is connected to the positive electrode&Nbsp&Nbsp&Nbsp; The difference in resistance between the two times is significant, and the VD performance is excellent&Nbsp&Nbsp; The resistance is infinite twice. VD open circuit should be discarded&Nbsp&Nbsp; The resistance is zero twice, and the VD has been hit internally&Nbsp&Nbsp; The two resistances are close, and VD failure is very unfavorable&Nbsp&Nbsp&Nbsp; Different types of gear shifts result in varying gear measurement values&Nbsp&Nbsp&Nbsp; Pay attention to the internal voltage when detecting light-emitting diodes&Nbsp&Nbsp; The significant difference is not surprising. Can be connected in series with resistors and batteries
&Nbsp&Nbsp; The detection of a diode is based on its unidirectional conductivity. NAD128W3A28N6 can conveniently determine the quality of the diode by measuring its forward and reverse resistance. Generally, set the multimeter to R × Using a black lead to connect to the positive pole of the diode and a red lead to connect to the negative pole of the diode in lkfl gear is called forward measurement, and the resistance value obtained from forward measurement is called forward resistance
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