China Education Equipment Purchasing Network News: All active equipment needs electricity to activate and use, and the capacitance is equivalent to the total electricity. Any combination of two conductors separated by an insulator is called a capacitor. Represented by the letter C, the unit is farad, and denoted by F.
Among them, 1F = 1000000μF = 106μF = 1012μF
The main indicators are capacitance and withstand voltage, such as 2.5μF / 450V.
Types include mica capacitors, ceramic capacitors, electrolytic capacitors and paper capacitors.
Generally, ceramic capacitors are used in high-frequency circuits, and electrolytic capacitors are mainly used as starting capacitors for motors.
When measuring capacitance, put the multimeter probe directly on the two terminals of the capacitor, and the digital meter can directly read the capacitance. When measuring with a pointer meter, use the resistance of the multimeter and set the resistance to the maximum range. If the pointer deflection angle is large, then gradually return to the original position (∞ position), indicating that the capacitor is good. If it does not return to the position of ∞, the resistance of the meter finger is the leakage resistance. The leakage resistance of the general capacitor is very large, usually tens to hundreds of megohms. Measure a large capacitance of more than 0.01μ, use a multimeter RX10K file, as long as the pointer of the meter is small or does not basically jump, it can be judged that the capacitor has been opened.
The capacity of the capacitor is different, and the angle of the pointer deflection is also different.
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