Common faults of capacitors are: open circuit, short circuit, leakage, and reduced capacity. For a capacitor with a larger capacity, an electric meter with an analog multimeter can determine whether the capacitor is good or bad, and qualitatively analyzes the quality of the capacitor.

and qualitatively analyzes the quality of the capacitor.

        Multi-meter gear selection principle: large capacity, small gear; small capacity, large gear. The general capacity is more than 47 μF and R ́100 is the selected. The capacity is 1 47 47 μF and R ́1 K is selected. The capacity is less than 1 μF and R ́10 K is selected. The capacity is less than 1 μF and R ́10 K is selected.The capacity is less than 1 μF and R ́10 K is selected. The capacity is less than 1 μF and R ́10 K is selected.

 

        First short the capacitor two pins (the purpose is to release the capacitor stored charge), and then connect the two meters of the multimeter in parallel to the capacitor two pins, observe the swing of the dial pointer: if the pointer quickly returns to the starting point after deflection, then The capacitor is good; if the pointer does not move, the capacitor is open circuit; if the pointer points to "0 Ω" does not move, it has broken through the short circuit; if the pointer stops on a certain scale in the middle, the capacitor leakage.