What is the reason why the multimeter does not respond to the capacitance measurement
If it is a digital multimeter measuring capacitance, there is no response. First of all, make sure whether the gear position and the jack are correct, and secondly, the multimeter is not broken. Such low-level mistakes generally do not qualify. If the multimeter is normal and the gear is correct, it is most likely that the capacitor is broken. When the inside of the capacitor is damaged by an open circuit (blown), the multimeter will display zero.
Another possibility is that when using a multimeter to measure the capacitance, the electricity in the capacitor must be discharged first, otherwise the internal components of the multimeter may be damaged. For small capacity capacitors, just short the two pins of the capacitor directly. For large-capacity capacitors or cable discharges, it cannot be directly shorted, otherwise the huge heat generated by the short circuit will cause the capacitor to bulge or even explode. The correct way is to connect a resistor or electrical equipment to both ends of the capacitor, and let the resistor or electrical equipment consume the power.
(When selecting electrical equipment, it must be ensured that the rated voltage of the electrical equipment is higher than the capacitor voltage.)
pointer multimeter
1. If you are using a pointer multimeter, it may be that the capacitance gear selection is too large. The capacitance file and the point resistance file of the pointer multimeter are integrated, the larger the resistance file is, the smaller the capacitance file is.
2. Another situation is that the capacitor is damaged. When the capacitor is open circuited (disconnected), the pointer of the multimeter will have no response. When the capacitor is short-circuited (short-circuited), the pointer of the multimeter will stop at the zero scale of the resistance.
Under normal circumstances, use the pointer multimeter to measure the capacitance. The pointer will first deflect to the right quickly, then go back slowly, and finally stop at a certain position. The larger the capacity of the capacitor, the larger the angle of right deflection of the pointer; the better the quality of the capacitor, the closer the final stop position of the pointer is to infinity.
3. Another is that the capacitor is not discharged. Use a pointer multimeter to measure the capacitance. After each measurement, you need to re-measure and re-discharge (short circuit). Some friends said that I did not discharge the electricity for the first time? Because every time the capacitance is measured with the capacitance file (actually the resistance file), the battery inside the multimeter will charge the capacitor. So every time you need to re-measure after the measurement, you must short-circuit the capacitor.
