My multimeter doesn t have a capacitor stop, so I can measure whether the capacitance is good or bad

Use the resistance ohm file of the digital multimeter, and discharge the measured capacitor before testing to prevent damage to the digital multimeter. The two stages of the capacitor are not connected, and it is best to connect them with appropriate resistors. Capacitance:

Use the resistance gear to select the appropriate range according to the capacitance capacity, and pay attention to the positive pole of the capacitor for the electrolytic capacitor black meter pen when measuring. Estimate the capacitance of microwave capacitance: It can be judged by empirical or reference to the standard capacitance of the same capacitance, and according to the maximum amplitude of the pointer swing.

For example, a capacitor of 100 F 250V can be estimated with a capacitance of 100 F 25V, as long as the pointer swings the maximum amount, the capacitance can be determined to be the same. Estimate the capacitance of pico-level capacitance: use R 10k, but only capacitance above 1000pf can be measured.

For capacitors of 1000pf or a little larger, as long as the watch hand swings slightly, the capacitance is considered sufficient. Test whether the capacitor leaks: for more than 1,000 microfarnes, you can use R 10 gear to quickly charge it, and preliminarily estimate the capacitance capacity, and then change to R 1k gear to continue to measure for a while, at this time the pointer should not return, but should stop at or very close, otherwise there is leakage.

For some timing or oscillation capacitors below tens of micromethods (such as the oscillation capacitance of color TV switching power supply), the requirements for its leakage characteristics are very high, as long as there is a slight leakage, it can not be used, at this time, you can use the R 1k file after charging, and then use the R 10k file to continue to measure, the same watch hand should stop at the place and should not return.

Use ohmic gear, use two markers to point the capacitor on both feet, and see that the resistance of the capacitor will change from small to large, which proves that the capacitance is still good, and the resistance does not change, and the capacitor may be bad. Because I don't know what the capacitance is, I have to try it a few more times. Oh.

To measure the quality of the capacitor, it is best to use the pointer multimeter to measure, the pointer multimeter is more intuitive, the following will take the pointer multimeter as an example, talk about how to measure the quality of the capacitor.

First measure the capacitance of the capacitor, the capacity is more than 100 microfarads, dial the meter to the resistance level Rx100 gear, a few thousand microfarads or more, dial the meter to the RX10 gear, and dial the meter to the RXK file with hundreds of microfarads. When measuring, use two watch pens to measure both ends of the capacitance dissipator back and forth, and the watch hand has the following swing:

a. The watch hand swings quickly to the right (the larger the capacitance, the greater the swing angle), and slowly returns to its position, this capacitor is good.

b. The watch hand swings quickly to the right, and the full degree of the watch hand points to zero, and then stops moving, indicating that the capacitor has been broken down and short-circuited. Or the watch hand doesn't move at all, it's broken.

c. After the watch hand swings to the right, it slowly returns to the middle, indicating that the internal leakage of this capacitor Zheng Zai device is also bad.

d. If there is no multimeter, you can also use a battery and a small bulb to judge the good and bad, the way is to connect the capacitor with the battery and the small bulb in series, at this time, the bulb is on, the capacitor is bad, and it is good if it is not lit.

e, the capacity in the thousands of shouting digging Wang Wei method, the watch hand is basically not moving is good, the watch hand is full is bad.