How does the multimeter test the capacitance?

Generally, people only test whether the capacitor is good or bad when the test rod of the multimeter touches the two poles of the capacitor. It is good for the shock to occur, otherwise it is bad. This judgment is wrong.

Generally people are testing the quality of a capacitor only if there is an impact when the test rod of the multimeter touches the two poles of the capacitor. The impact is good, otherwise it is bad. This judgment is wrong.

The insulation resistance is an important indicator of the quality of a capacitor. A multimeter can be used to check the insulation resistance. When the test bar of the multimeter is connected to the two poles of the capacitor, because the capacitor is charged, the pointer will inevitably have an impact. After the test bar is removed, it passes through 5 Try again in seconds. If the pointer has no obvious impact, it means that due to its high insulation resistance, the remaining charge of the capacitor has only leaked a little. This kind of capacitor is good. If the impact still occurs, it means that the charge 5 seconds ago has been charged. Leakage, the insulation of the capacitor has been damaged.