How to use a multimeter to detect the quality of electrolytic capacitors
Step 1: First, adjust the multimeter to the appropriate ohm range. For capacitors with a capacity of less than 1UF, use the "20k" range for detection. For capacitors with a capacity between 1UF and 100UF, use the "2K" range Gear detection: For capacitors with a capacity greater than 100UF, use the "200" gear for detection. Step 2: Then use the two probes of a multimeter to connect them to the two ends of the capacitor (the red probe is connected to the positive terminal of the capacitor, and the black probe is connected to the negative terminal of the capacitor). If the displayed value gradually increases from 000 and finally displays the overflow symbol 1, it indicates that the capacitor is normal. If the multimeter always displays 000, it indicates that there is an internal short circuit in the capacitor. If it always displays 1, it may be a short circuit between the poles inside the capacitor. For capacitors with a commonly used capacity between 0.47UF and 2200uF, the MF47 type meter can be directly used to detect their capacity and quality. Specific method: fully discharge the capacitor, and use the black gauge to check its quality. Connect the pen to the positive pole of the capacitor and the red probe to the negative pole of the capacitor. Determine if the capacitor is damaged based on the maximum number of squares it swings (50 squares for full squares) The data is shown in the table below: The number of capacitor levels is 0.47uFx10K7 1uFx10K12 2.2uFx10K20 4.7uFx1K710uFx1K12 22uFx1K20 47uFx107100uFx10012 220uFx10200 470uFx107 1000uFx1012 2200uFx1020. Note that the black pen is connected to the positive pole of the capacitor, and the red pen is negative. If connected incorrectly, it may cause inaccurate data. Each measurement of capacitance needs to be re discharged. Conclusion: If the needle does not move or moves slightly, it indicates that the capacitor is faulty. If the needle returns too slowly, the capacitor may leak or the multimeter gear may be used incorrectly. If the needle gradually rises after returning, the capacitor may have slight leakage or poor quality.
