How to Measure Oversized Capacitors with a Multimeter
If the capacitance is relatively large, generally the multimeter resistance file to × 10 or × 100 file, with two pens to touch the ends of the large capacitor, the needle will have a large fluctuation, and then gradually return to zero, and then adjust the pen, the needle will have a very large fluctuations, and even will have to hit the needle, the larger the fluctuations, the larger the capacitance, proving that the capacitance is not bad, if the needle is not fluctuating, or fluctuations are very small, proving that the capacitance has been If the needle does not fluctuate, or the fluctuation is very small, it proves that the capacitor has been reduced in capacity and cannot be used.
Note: Multimeter measurement of capacitance, try to start with a small gear, and gradually use a large gear, so as not to break the needle.
In addition, high-voltage capacitance, so that the measurement of error, there may be inaccurate measurement, because high-voltage capacitance in the low voltage, no problem, but in the high-voltage, but there will be a problem, the multimeter's voltage is only 1.5 volts, so high-voltage capacitance some of the time using the multimeter is inaccurate measurement.
The above can only judge the good and bad capacitors, can not judge the specific capacity of capacitors.
Select the range corresponding to the resistance value and then start measuring.
You said the resistance value is very large, I wonder how large? For example, larger than the value of the multimeter, you can try to measure the voltage and current values to account for the resistance value.
Large capacitors can be detected with a multimeter resistance block, which is only a rough detection of failure, short-circuit, as to how much decline, but also to use a special capacitance tester to detect, for the PF capacity level capacitance multimeter can not be roughly detected good or bad!
Measurement of large capacitance, pro-pointer multimeter measurement first dial to the resistance block R x 1, look at the pointer deflection time, the larger the capacity of the longer time indicates the size of its electrical capacity. If there is no such reaction, it indicates that the capacitance is gone.
