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Capacitor detection

baijiahao | 08/04/2021

As we all know, capacitors are one of the common electronic components in electronic circuits.

At the same time, it is also the type of component that is more susceptible to damage.

Found in common situations in our daily lives,

The common failures of capacitors are open circuit failure, breakdown failure, leakage failure and deterioration failure.

The form of the capacitor after the open circuit is that the capacitor loses its due function, and the circuit is in the form of disconnection, which is measured by an external meter as the impedance of the capacitor is infinite.

The breakdown of the capacitor appears as a path between the two pins of the capacitor.

The direct blocking effect of the capacitor disappears,

The DC working circuit of the circuit will fail, which will affect the AC circuit and also fail. The measurement with a multimeter shows that the breakdown capacitor impedance is zero.
When the capacitor has a leakage fault, the insulation performance between the two poles of the capacitor is reduced.

The performance of the capacitor for blocking DC and AC will also be reduced. This type of fault is more difficult to detect, and leakage resistance will be generated at the two poles of the capacitor.

The deterioration of the capacitor is mainly manifested as the decrease of the capacity of the capacitor.

Especially for electrolytic capacitors, the capacitance decreases due to the drying of the electrolyte inside the capacitor for a long time, which reduces the performance of the capacitor, which is what we often call the "bulging" phenomenon. Be sure to observe carefully during maintenance.

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