Detection method of electrolytic capacitor

    As a type of electronic components, electrolytic capacitors have a variety of types. In addition to fixed capacitors, electrolytic capacitors are also a type.

    What are the detection methods of electrolytic capacitors, how to correctly detect and judge the capacity of electrolytic capacitors, and the detection methods of electrolytic capacitors with unclear positive and negative marks.

Test method I:

    The capacity of electrolytic capacitor is much larger than that of general fixed capacitor. Therefore, during measurement, appropriate measuring range shall be selected for different capacities.

    According to experience, generally, 1 ~ 47 μ Capacitance between F, R × 1K block measurement, greater than 47 μ The capacitance of F can be used as R × 100 gear measurement.

Test method 2:

    Connect the red lead of the multimeter to the negative electrode and the black lead to the positive electrode. At the moment of contact, the pointer of the multimeter deflects to the right with a large deflection (for the same electrical barrier, the greater the capacity, the greater the swing), and then gradually turn to the left until it stops at a certain position.

    The resistance at this time is the forward leakage resistance of the electrolytic capacitor, which is slightly greater than the reverse leakage resistance. The practical application experience shows that the leakage resistance of electrolytic capacitor should generally be more than several hundred K Ω, otherwise it will not work normally.

    In the test, if there is no charging phenomenon in the forward and reverse directions, that is, the gauge needle does not move, it indicates that the capacity disappears or the internal circuit is open; If the measured resistance value is very small or zero, it indicates that the capacitor has large leakage or has been broken down and damaged and can not be used again.

Test method 3:

    For electrolytic capacitors with unclear positive and negative marks, the above method of measuring leakage resistance can be used to distinguish.

    That is, measure the leakage resistance arbitrarily, remember its size, and then exchange the probes to measure a resistance value. From: Electrician world

    The one with the largest 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.

Test method 4:

    The capacity of the electrolytic capacitor can be estimated and measured by using the resistance block of the multimeter and the method of charging the electrolytic capacitor in the forward and reverse directions. According to the swing range of the pointer to the right.

    The above are the four detection methods of electrolytic capacitors for your reference.

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