Air-conditioning capacitor judgment method (II)

2. Analog multimeter, digital capacitance meter can also be used. If you use an analog multimeter, generally use the R × 1K file, and connect the test leads to the two poles of the capacitor. At this point, the multimeter pointer will swing and then slowly return to zero or near zero. Such a capacitor is good. The larger the capacity of the capacitor, the longer the charging time, and the slower the hand swings in the 00 direction. If it is connected, the resistance value of the pointer does not move very little and it is definitely bad.

3. Digital multimeter detection. With a digital multimeter check, the digital multimeter is set to the appropriate resistance level, and the red and black meter pens touch the two poles of the measured capacitor, respectively. At this time, the display value will gradually increase from 000 until the overflow symbol "1" is displayed. If 000 is always displayed, the capacitor is internally short-circuited. If the overflow is always displayed, it may be an open circuit between the internal poles of the capacitor, or the selected resistor may not be suitable.

After a capacitor breaks down or opens, it cannot be repaired. Only new capacitors of the same type can be replaced. The development of science and technology can not be separated from electronic components, capacitors also cast our high-quality life.