How to judge the goodness of 15000μF large capacitor with a multimeter
How to judge the good or bad of 15000μF capacitor by multimeter?
15000μF capacitor good or bad, if you use the multimeter resistance file through the charging and discharging to judge the good or bad, this method is not very feasible, because the multimeter resistance file test current is generally very small (μA level), measuring such a large capacitance, charging and discharging time is very long. Want to judge the 15000μF capacitor is good or bad, the simple way is to use the digital multimeter diode file or capacitor file to judge. The following two methods are introduced separately.
1, with a digital multimeter capacitance file to measure the capacity directly
Use the capacitance of digital multimeter to measure the capacity directly.
Now many digital multimeter can measure 20mF (here "mF" read as "millifar", 1mF = 1000μF) below the capacitance (the previous multimeter can only measure the maximum 200μF capacitance), so judge the 15000 Therefore, to judge the good or bad of 15000μF capacitors, you can directly use the capacitance of the multimeter to measure its capacity.
The 4700μF electrolytic capacitor measured by the multimeter.
A digital multimeter is used to measure the capacity of a 4700μF (since there are no 15000μF capacitors) capacitor. The graph shows a reading of 4.502mF, or 4502μF, which is normal due to the large error of electrolytic capacitors. Measurement of large-capacity electrolytic capacitors, if not over the range, the display of the reading has been "1", indicating that the capacitor leakage is large or has been damaged by breakdown. If the measured capacitance is much smaller than the nominal value, it means that the internal electrolyte of the capacitor is dried up and generally should not be used.
2, with a digital multimeter diode file to determine the good and bad
If there is no measurement of large-capacity capacitors digital multimeter, you can also use the ordinary digital multimeter diode file to simply judge the capacitance of good and bad. Due to the diode file of the test current is larger (mostly more than 1mA), through the diode file measurement can be faster measurement of large capacitance whether breakdown damage. Measurement, with a multimeter pen contact capacitance of the two pins, if it is a good capacitor, the first dozen seconds, the diode file display readings may be "0.000", after the display readings will gradually increase until the display is "1". If the measurement, the multimeter display reading for a long time for 0.000 (or reading has been very small), that the capacitor has been damaged.
