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A Because the capacity of the electrolytic capacitor is much larger than that of the general fixed capacitor, appropriate measuring range should be selected for different capacities during measurement. According to experience, in general, 1~47 μ Capacitance between F, R available × 1k gear measurement, greater than 47 μ F capacitor available R × 100 gear measurement.
B Connect the red lead of the multimeter to the negative pole and the black lead to the positive pole. At the moment of contact, the pointer of the multimeter will deflect to the right with a large deflection (for the same electrical barrier, the larger the capacity, the greater the swing), and then gradually turn to the left until it stops at a certain position. At this time, the resistance is the forward leakage resistance of the electrolytic capacitor, which is slightly greater than the reverse leakage resistance. The practical use experience shows that the leakage resistance of electrolytic capacitor should be more than several hundred k Ω generally, otherwise, it will not work normally. In the test, if there is no charging phenomenon in both the forward and reverse directions, that is, the meter needle does not move, it indicates that the capacity is lost or the internal circuit is open; If the measured resistance value is very small or zero, it indicates that the capacitance has large leakage or has been damaged by breakdown and cannot be used again.
C For electrolytic capacitors with unknown positive and negative signs, the above method of measuring leakage resistance can be used for discrimination. That is, first measure the leakage resistance at random, remember its size, and then exchange the probe to measure a resistance value. The one with high resistance in the two measurements is the positive connection method, that is, the black probe is connected to the positive electrode, and the red probe is connected to the negative electrode.
D The capacitance of the electrolytic capacitor can be estimated according to the amplitude of the pointer swinging to the right by using the resistance gear of the multimeter and charging the electrolytic capacitor in both positive and reverse directions.

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