Detection of small capacitors below 10pF – Because the capacity of fixed capacitors below 10pF is too small, the measurement with multimeter can only qualitatively check whether there is leakage, internal short circuit or breakdown phenomenon. When measuring, you can choose multimeter R×10k block, use two pens to connect two pins of the capacitor respectively, the resistance value should be infinity. If the resistance value (pointer swinging to the right) is zero, it means the capacitor is damaged by leakage or internal breakdown. Capacitor,ceramic capacitor,film capacitor
To detect the charging phenomenon of 10PF～001μF fixed capacitor, and then identify its good or bad. The multimeter selects R×1k block. The β value of two transistors are above 100, and the penetration current should be small. 3DG6 and other types of silicon triode can be used to form a composite tube. Multimeter red and black pens are connected with the emitter e and collector c of the composite tube.
Due to the expansion effect of the composite transistor, the capacitance to be measured by the charging and discharging process to be expanded, so that the multimeter pointer to increase the volatility, and then facilitate the investigation. It should be noted that: when the test operation, especially in the measurement of smaller capacity capacitors, we should repeatedly exchange the measured capacitor pins to touch A and B points, so that we can obviously see the swing of the multimeter pointer.
Nem poláris nagyfeszültségű kondenzátor

Nem poláris nagyfeszültségű kondenzátor

Since the capacity of ceramic capacitor is generally small (PF level), it is difficult to discriminate by charging and discharging with the pointer multimeter, so it is recommended to use the capacitance block of digital multimeter.
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