Safety capacitor detection method.Safety capacitor is a kind of capacitor that will not affect the human body even if it fails. Because of its high performance, it has become a advertised product among capacitor products and is highly favored. However, testing is an indispensable process for the purchase or use of safety capacitors.
Once there are any problems in the process of using safety capacitors, the first thing to do is to test the safety capacitors. This is very important. How to detect safety capacitors? What methods are there to detect?
The detection of safety capacitors needs to connect the red test lead of the multimeter to the negative pole and the black test lead to the positive pole. At the moment of contact, the pointer of the multimeter deflects to the right by a large degree. 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 larger than the reverse leakage resistance.
Practical experience shows that the leakage resistance of the capacitor should generally be more than several hundred kΩ, otherwise, it will not work normally. In the test, if there is no charging phenomenon in the forward and reverse directions, that is, the hand does not move, it means that the capacity has disappeared or the internal circuit is broken; if the measured resistance is small or zero, it means that the capacitor has a large leakage or has been broken down. Can no longer be used.
Through the above method to detect the safety capacitor, you can easily judge whether it is good or bad and whether it can still be used. If the test result shows that it has been broken down or there is a serious leakage phenomenon, it must be replaced in time without delay. For safety capacitors, once damaged, its performance is likely to be affected.
The importance of safety capacitor testing is very important. The first is the stability test of the label, and the second is the capacitor discharge test. If these tests for the safety capacitor are ignored, it is difficult to guarantee the quality and quality of the selected safety capacitor.