How (how) to measure the quality of electrolytic capacitors and solid capacitors with a multimeter
1. First put the multimeter on the resistance file
2. Use the two test leads of the multimeter to touch the two ends of the electrolytic capacitor respectively.
At this time, the pointer of the multimeter will deflect clockwise to the right. When the pointer deflects to a certain position, the pointer of the multimeter stays for a while, and then slowly deflects to the left until it returns to zero.
3. Then reverse the two test leads of the multimeter, and press (2) to test again.
If the two measurements are the same as (2), it means that the electrolytic capacitor is good.
If the following two situations appear in the measurement, it means that the electrolytic capacitor is bad:
1. Electrolytic capacitor breakdown and short circuit
When measuring, when the two test leads of the multimeter touch the two ends of the electrolytic capacitor, the pointer of the multimeter will deflect clockwise to the right. When the pointer deflects to a certain position, the pointer of the multimeter will stop for a while, and then It will slowly deflect to the left. If you find that the pointer of the multimeter cannot deflect to the left, it means that the electrolytic capacitor has been broken down and short-circuited internally. Such an electrolytic capacitor cannot be used.
2. Electrolytic capacitor leakage
When measuring, when the two test leads of the multimeter touch the two ends of the electrolytic capacitor, the pointer of the multimeter will deflect clockwise to the right. When the pointer deflects to a certain position, the pointer of the multimeter will stop for a while, and then It will slowly deflect to the left. If you find that the pointer of the multimeter can slowly deflect to the left but cannot return to zero, it means that the electrolytic capacitor has internal leakage, and such an electrolytic capacitor cannot be used.
