What are the detection methods for capacitors?

　　
A capacitor is a device that can hold an electric charge. It is one of the most widely used electronic components in electronic devices. It is widely used in circuits such as separation, direct crossover, coupling, bypass, filtering, tuning, energy conversion, and control. So, what are the detection methods for capacitors? Let's take a look at the answer from Guangzhou Zhipin Huide Electronic Technology Co., Ltd.

　　What are the detection methods for capacitors?

I. Detection of fixed capacitors

1. Detect small capacitors below 10pF. Since the capacity of fixed capacitors below 10pF is too small, it can only be qualitatively checked for leakage, internal short circuit or breakdown when measured with a multimeter.

When measuring, you can choose the R×10K multimeter gear. The two probes can be freely connected to the two capacitor pins. The resistance value should be infinite. If the measured resistance (the pointer swings to the right) is zero, it indicates that the capacitor is damaged due to leakage or internal breakdown.

2. Check whether the 10PF-0.01UF fixed capacitor is charged and judge whether it is good or bad. The multimeter should be R×1K. The β values of both transistors are above 100, and the penetration current can be composed of 3DG6 and other silicon transistors.

The red and black test leads of the multimeter are connected to the emitter E and collector C of the composite tube respectively. Due to the amplification effect of the composite transistor, the charging and discharging process of the measured capacitor is amplified, and the swing amplitude of the multimeter pointer is increased, which is convenient for observation.

It should be noted that during the test operation, especially when measuring small-capacity capacitors, the pins of the measured capacitor should be repeatedly replaced so that they are in contact with points A and B to clearly see the swing of the multimeter pointer.

3. For fixed capacitors above 0.01μF, the multimeter R×10k gear can be used to directly test the charging process and the internal short circuit or leakage of the capacitor, and the capacitor capacity can be estimated according to the amplitude of the pointer swinging to the right..

II. Electrolytic capacitor detection

1. Since the capacitance of electrolytic capacitors is much larger than that of general fixed capacitors, a suitable measurement range should be selected to meet different capacities.