万用表检测电子元件经验技巧（Experience in measuring electronic components with a multimeter）.docVIP

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万用表检测电子元件经验技巧（Experience in measuring electronic components with a multimeter）.doc

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万用表检测电子元件经验技巧（Experience in measuring electronic components with a multimeter）

万用表检测电子元件经验技巧（Experience in measuring electronic components with a multimeter） Experience and skills in measuring common electronic components with Multimeter 1. measure the polarity of each foot of the rectifier bridge Multimeter R * 1K block, any pin probe connected to the black bridge, the red pen has measured the remaining three feet, if readings are infinite, while the black pen are connected to the positive output bridge, if the reading is 4 ~ 10K, while the black pen connected pin as an output anode bridge. The rest of the two pin to bridge the AC input end. 2. judge the quality of crystal oscillator First with a multimeter (R * 10K block) crystal at both ends of the measured resistance value, if it is infinite, that crystal without short-circuit or leakage; then the test pencil is inserted into a commercial power socket, either pin pinch with your fingers of the crystal, the other part of the metal pin touch test pencil tip, if the test pencil the neon red crystal that is good; if the neon bulb does not light, the crystal damage. 3. unidirectional thyristor detection Multimeter R * 1K or R * 100 gear measuring arbitrary poles ask reverse resistance, if you find a pair of low resistance resistance (100 ohm to LK Ohm), then the black pen connected to the control electrode of the red pen is connected to the cathode, another pole as the anode. There are 3 PN junctions in the thyristor. We can judge the quality of the PN junction by measuring the positive and negative resistance of PN junction. Measurement control (G) and [C) between the cathode resistor, if reverse resistance is zero or infinity, that control of short circuit or open circuit measurement; control (G) and anode (A) between the resistance, positive and negative resistance readings should be great; When measuring the resistance between the anode (A) and the cathode (C), both positive and negative resistances should be large. Polarity recognition of 4. bidirectional thyristor The bidirectional thyris