Digital multimeter to measure the capacitor good or bad
The use of digital multimeter, dial to the capacitance file with capacitance file measurements, dial to 200uf file use, only use this capacity of the file to accurately measure the data, because it is not electrolytic capacitors, so do not distinguish between positive and negative poles, measurement of the digital display of the first small numbers gradually increase, in the switch capacitance pen, from the new measurement of the digital table readings, from the high value gradually decreases to the small value is normal, otherwise direct Readings stopped to a certain value for the sign of damage, and then use the resistance 200 ohm gear measurement such as zero or resistance value is very small for the breakdown state, the use of capacitance file, please follow the picture below to use the pen connection can be used for normal use and measurement.
Use the capacitance of the multimeter to test the capacity to see how much error with the nominal capacity, within 20% are considered normal.
Then use the resistance file to measure the resistance of the capacitor, the time should be longer, because there is a charging process, usually within 10-30 seconds, when the data is stable can be regarded as the measurement is complete, it should be the result of infinity, otherwise it is the capacitor leakage.
However, this test is not complete, because the multimeter voltage is too low to measure the capacitor leakage state under high voltage, and many capacitor damage is high voltage breakdown leakage.
It depends on the situation.
In the case of a capacitor file, directly with the capacitor file to test; if there is no capacitor file, then adjust to the resistance file, like the amount of resistance, the beginning of the display value is small, and then will gradually increase, and finally show 1, and then complete the charging process.
This is only a rough test of good and bad, the damage is more obvious, it can be judged. But many still can not judge.
Such as: capacitor voltage, leakage current and other parameters, it is best to use special equipment, the best way to do maintenance is to replace.
