First of all, we must rule out whether the multimeter is faulty. What about him? The method of multimeter failure is to measure the resistance with a multimeter. If there is a standard resistance to measure the standard resistance, it may calibrate the electric block of the multimeter. If you respond when Wang Yong-meter measures the resistance and the value is normal, then we can judge that the multimeter is not damaged.

With the above experience, we can directly buy a multimeter that can measure the capacitance, set the multimeter to the capacitance file, put the red stylus on one foot and the black stylus on the other. Generally, the capacitance file of a multimeter has only one file, so it can be directly connected for measurement. If the capacitance is good, the capacitance value can be displayed directly on the screen, and the measured value will have a 5 percent error of the calibration value.