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Use a multimeter to judge the quality of the capacitor
Sep 01, 2018

Depending on the size of the electrolytic capacitor, the R×10, R×100, and R×1K blocks of the multimeter are usually used for testing and judgment. The red and black test leads are respectively connected to the negative pole of the capacitor (the capacitor needs to be discharged before each test), and the yaw of the hands is used to judge the quality of the capacitor. If the hands swing quickly to the right and then slowly return to the left, the capacitor is generally good. If the hands do not turn after swinging, the capacitor has broken down. If the hands are gradually returned to a certain position after the pen is swung, the capacitor has leaked. If the hands are not able to swing, the capacitor electrolyte has dried up and lost capacity.

Some leakage capacitors are not easy to accurately judge by the above method. When the withstand voltage of the capacitor is greater than the voltage value of the battery in the multimeter, according to the characteristics that the leakage current is small when the electrolytic capacitor is being charged and the leakage current is large during the reverse charging, the R×10K block can be used to reversely charge the capacitor. Whether the needle stays stable (ie, whether the reverse leakage current is constant), thereby judging the quality of the capacitor, and the accuracy is high. The black pen is connected to the negative pole of the capacitor, the red pen is connected to the positive pole of the capacitor, the hands are quickly swung up, and then gradually retreat to somewhere to stay still, indicating that the capacitor is good, and the hand is unstable after a certain position or stays. The capacitor moving slowly to the right has leaked and cannot be used any more. The hands are generally stuck and stable within the 50-200K scale.

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