How Do Electrical Fittings Use A Pointer Multimeter To Detect Electrolytic Capacitors?

Single Pole Distribution Blocks How to use a pointer multimeter to test electrolytic capacitors?
(1) Because the capacity of electrolytic capacitors is much larger than that of general fixed capacitors, when measuring, the appropriate range should be selected for different capacities. According to experience, under normal circumstances, the capacitance between 1 and 47pF can be measured with the RX1k range, and the capacitance greater than 47pF can be measured with the RX 100 range.
(2) Connect the red probe of the multimeter to the negative pole and the black probe to the positive pole. At the moment of contact, the multimeter pointer deflects to the right with a large deviation (for the same ohm range, the larger the capacity, the larger the swing), and then gradually turns to the left until it stops at a certain position. The resistance value 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 electrolytic capacitor should generally be above several hundred kilo-ohms, otherwise it will not work normally. During the test, if there is no charging phenomenon in both the forward and reverse directions, that is, the needle does not move, it means that the capacity has disappeared or the internal circuit is broken; if the measured resistance value is very small or zero, it means that the capacitor has a large leakage or has been broken down and damaged and cannot be used.
(3) For electrolytic capacitors with unclear positive and negative pole markings, the above-mentioned method of measuring leakage resistance can be used to identify them. That is, first measure the leakage resistance at random, remember its size, and then exchange the test leads to measure another resistance value. The one with the larger resistance value in the two measurements is the forward connection method, that is, the black test lead is connected to the positive pole and the red test lead is connected to the negative pole.
(4) Using the ohm range of the multimeter, the method of charging the electrolytic capacitor in the forward and reverse directions can be used to estimate the capacity of the electrolytic capacitor based on the amplitude of the pointer swinging to the right.