Nowadays, SMD components have been applied in the vast market, whether in high-tech products such as computers, mobile communication devices, medical electronic products, and LCD TVs, PDP TVs, LCD color displays, camcorders, mobile phones, DVDs, etc. Widely used in electronic and electrical equipment. However, many engineering projects are not very thorough about these electronic components. Henghuixin is specialized in producing chip capacitors and chip resistors. Today we will explain how to test resistors, chip capacitors, diodes, and triodes. .
First, we must first understand the resistance: the functions of buck, voltage divider, current limit, and shunt are generally used in the power supply part of the motherboard. The use of resistors in the circuit. The series resistance of the resistor increases, and the resistance of the resistor is reduced. The digital multimeter is slightly matched to the nominal value of the resistor. The two ends of the resistor are directly measured by the two test leads. If the resistance of the fish is basically the same, Indicates that the resistance is good. If the measured resistance is significantly larger or infinite, the resistance is broken.
Exclusion: The resistance is divided into a: eight-leg row resistance; b: ten-foot row resistance; c: sixteen-foot row resistance measurement method and the same capacitance as the measurement common resistance: filtering, coupling drop and resistance constitute RC timing circuit and The inductance constitutes LC.
The resonant circuit, the capacitor also has the characteristics of AC, DC and high frequency blocking low frequency.
The judgment of the chip capacitor: the digital multimeter is hit to the diode file, the two meter pens directly measure the capacitance at both ends, and the good capacitance multimeter reads the infinity; if the multimeter reads zero, it means that the capacitor breakdown is short, and the chip capacitor cannot leak. Measuring with a multimeter can only be judged by the replacement method.
Electrolytic Capacitor Judgment: Electrolytic capacitors appear as Drum, Leak, Deformation, etc. Hit the digital multimeter to the diode file. Touch the two ends of the capacitor with two meter pens and then change the test leads and measure again. The good capacitance multimeter should read from the multimeter. Negative values ​​quickly jump to infinity. If the multimeter reading jumps to a certain value and then stops or jumps slowly, it indicates that the capacitor is leaking. If the multimeter reads zero, it indicates that the capacitor is shorted.
Diode function: diodes such as detection, rectification, voltage regulation, foil position, limiting, and switching are unidirectionally conductive.
The quality of the diode is judged: the digital multimeter is hit into the diode file, and the diode is used to measure any two ends of the diode. One set of readings is about 600 ohms, and the other set is infinite, indicating that the tube is a good tube and vice versa.
Transistor triode's polarity judgment and tube type judgment: Put the digital multimeter into the diode file. First, use the red test pen to assume that one of the three poles is the b pole, and then touch the other two pins of the triode with the blackboard pen. If the measured results of the two results are not much different and are around 600 ohms, it is correct, the red pen is connected to the b pole, and the tube is an NPN tube, the ce pole is judged, in two measurements For example, the one with the smallest reading is taken, the black pen is connected to the c pole, and the blackboard with the largest reading is connected to the e pole.
The judgment of the triode is good or bad: the digital multimeter hits the diode bc, and the bee positive reading is about 600; the reverse has no resistance (the e pole has no resistance in the forward and reverse directions), and vice versa.
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