How to use a multimeter to judge the quality of a capacitor - News - Global IC Trade Starts Here Free Join

SMD Aluminum Electrolytic Capacitor

Photocoupler

Testing small capacitors is quite straightforward. You can use a multimeter set to the resistance range (usually 1kΩ or 10kΩ). Connect the red and black probes to the two terminals of the capacitor. If the needle swings rapidly and then slowly returns to its original position, it indicates that the capacitor is in good condition. The larger the swing, the better the capacitance.

If the needle doesn't move at all, it means the capacitor is open-circuited or damaged. If the needle moves but doesn't return to zero, it could be a sign of internal leakage or breakdown. Always make sure to discharge the capacitor before testing to avoid any damage to the multimeter or risk of electric shock.