What is the reason why the multimeter did not respond when measuring capacitance
If it is a digital multimeter measuring capacitance, there is no response. Firstly, confirm whether the gear position and jack are correct, and secondly, the multimeter is not damaged. This low-level error usually does not go out of line. If the multimeter is normal and the gear is correct, it is most likely that the capacitor is broken. When the capacitor is damaged due to an open circuit (burning), the multimeter displays zero.
Another possibility is that when measuring capacitance with a multimeter, the electricity inside the capacitor must be discharged first, otherwise it may damage the internal components of the multimeter. For small capacity capacitors, simply short circuit the two pins of the capacitor. For large capacity capacitors or cable discharges, they cannot be directly short circuited, otherwise the huge heat generated by short circuiting can cause capacitor bulging or even explosion. The correct approach is to connect a resistor or electrical device to both ends of the capacitor, allowing the resistor or electrical device to consume electrical energy.
When selecting electrical equipment, it is necessary to ensure that the rated voltage of the equipment is higher than the capacitor voltage
Pointer multimeter
If a pointer multimeter is used, it is possible that the capacitor gear selection is too high. The capacitance range and point resistance range of the pointer multimeter are integrated, and the larger the resistance range, the smaller the capacitance range.
Another situation is that the capacitor is damaged. When the capacitor is internally open (disconnected), the multimeter pointer will not respond. When there is an internal short circuit (short circuit) in the capacitor, the multimeter pointer will stop at the zero mark of the resistance.
Under normal circumstances, use a pointer multimeter to measure capacitance. The pointer will quickly deflect to the right, then slowly move back, and finally stop at a certain position. The larger the capacitance, the greater the right deviation angle of the pointer; The better the quality of the capacitor, the closer the final stop position of the pointer is to infinity.
3. Another type is that the capacitor does not discharge. Measure the capacitance with a pointer multimeter, and discharge it again after each measurement (short circuiting). Some friends say that I discharged the battery the first time, didn't they? Because every time a capacitor (actually a resistance) is used to measure capacitance, the battery inside the multimeter will charge the capacitor. So every time the measurement is completed and needs to be re measured, the capacitance needs to be short circuited.
