Why the multimeter does not have a capacitance reading
The capacity of a capacitor can be measured using a multimeter, and a multimeter can also be used to determine whether the capacitor is good or bad. So what are the problems if we use a multimeter to measure the capacitance but there is no response?
1. Multimeter and capacitor have no capacity
First of all, we need to rule out whether the multimeter is faulty. What about him? The method to detect a multimeter failure is to use a multimeter to measure resistance. If there is a standard resistance, measuring the standard resistance may calibrate the electrical resistance of the multimeter. If you react when the Wang Yongmeter measures the resistance and the value is normal, then we can judge that the multimeter is not damaged.
The capacitor has no capacity, which cannot be observed with the naked eye. If we use a multimeter and there is no response, then we need to replace it with a new capacitor and use a multimeter to measure it. If this capacitor responds, then we can determine whether the previous capacitor did not respond. Caused by lack of capacity.
2. Failure to choose a suitable gear
To measure capacitance, you can use the resistance setting or the capacitance setting. You can use an analog multimeter or a digital multimeter. If you use an analog multimeter, you must choose a good time. If the capacitance is large, we try to choose a small resistance setting, so that It is more obvious when we observe the return to normal. If the capacitor capacity is large and a large gear is selected, the fluctuation is relatively small, and sometimes we cannot detect it with the naked eye.
If we choose a digital multimeter, we must first find a good gear and observe the change in value. Generally, the capacitor will fluctuate when it discharges, and then returns to the process of discharge, indicating that the capacitor is good.
3. Directly select a multimeter to measure capacitance value
With the above experience, we can directly purchase a multimeter that can measure the capacitance value. Set the multimeter to the capacitance setting. Place the red test lead on one foot and the black test lead on the other foot. Generally, the capacitance setting of a multimeter has only one setting. , connect it directly for measurement. If the capacitance is good, the capacitance value will be displayed directly on the screen, and the measured value will have an error of 5% of the calibration value.
