Whether a capacitor is working or not, sometimes a question arises for a person who has at least the slightest understanding of electrical engineering. How to check the capacitor with a multimeter if the visual inspection did not give a complete result. A multimeter is a universal device, with its help, you can check any capacitor for suitability. In specialty stores, you can find two versions of multimeters, these are digital and analog. Both are excellent solutions for measuring voltage, resistance, and current. The capacitor is checked with an ohmmeter, it is part of a multimeter.
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To check the capacitor, it must be pre-prepared. The capacitor located in the board is often not possible to check, so it is soldered out. If possible, only one leg can be soldered, and if the capacitor is electrolytic, then it must be completely released. Next, it is necessary to inspect the capacitor externally again, to make sure that there are no irregularities on the surface or other damage. Non-electrolytic capacitors are tested as follows. The device is connected to the resistance mode, the highest measurement value is set. After setting up, touch the capacitor legs with the screws. In the case of a serviceable capacitor, you will get a value of more than two megaohms. There are devices that are equipped with sockets for testing, in this case, you need to connect the capacitor to the socket, then take readings. It is worth reminding that when measuring, do not touch the screws with your hands, in this case the device will show the resistance of your body. The measurement of electrolytic and non-electrolytic capacitors is different. In the case of electrolytic devices, the leakage resistance is more than one hundred kOhms. Therefore, they must be discharged before testing. Then the measurement mode on the device is set to one hundred kOhms and, observing the polarity, we carry out the measurement. Note that during the measurement, charging occurs, so the capacitor changes values. As soon as charging is completed, the resistance value will increase to one hundred kOhms. This value is an indicator of the serviceability of the capacitor. Dial ohmmeters (analog) have the same principle of checking as digital ones. If the deviation of the arrow, i.e. the increase in resistance, is carried out to the end, while gradually, it can be assumed that the capacitor capacity is large enough. For reliable verification, it is better to have a multimeter with the function of checking the capacitance of the capacitor. When checking electrolytic capacitors, it is important to discharge them so as not to damage the device.
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