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Test methods for fixed capacitors


1. Detection of small capacitors below 10pF: Because the capacity of fixed capacitors below 10pF is too small, using a multimeter to measure can only qualitatively check whether there is leakage, internal short circuit, or breakdown. When measuring, a multimeter R can be selected × At 10k gear, use two probes to arbitrarily connect the two pins of the capacitor, and the resistance value should be always high. If the measured resistance value (pointer swinging to the right) is zero, it indicates that the capacitor is damaged due to leakage or internal breakdown.

2. Test 10PF ~ 001 μ Fixed capacitor: Determine whether there is charging phenomenon, and then determine whether it is good or bad. Multimeter selection R × 1k gear. Triode β The values are all above 100, and the penetration current should be small. Silicon triodes such as 3DG6 can be selected to form composite tubes. The red and black probes 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 triode, the charging and discharging process of the measured capacitance is amplified, which increases the swing amplitude of the multimeter pointer, making it easy to observe.

It should be noted that during testing operations, especially when measuring capacitance with a small capacity, it is necessary to repeatedly exchange the measured capacitance pin contact points A and B to clearly see the swing of the multimeter pointer. For 001 μ For fixed capacitors above F, the R value of a multimeter can be used × The 10k gear directly tests whether the capacitor has a charging process and whether there is an internal short circuit or leakage. The capacity of the capacitor can be estimated based on the magnitude of the pointer's swing to the right.

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Test methods for fixed capacitors

1. Detection of small capacitors below 10pF: Because the capacity of fixed capacitors below 10pF is too small, using a multimeter to measure can only qualitatively check whether there is leakage, internal short circuit, or breakdown. When measuring, a multimeter R can be selected × At 10k gear, use two probes to arbitrarily connect the two pins of the capacitor, and the resistance value should be always high. If the measured resistance value (pointer swinging to the right) is zero, it indicates that the capacitor is damaged due to leakage or internal breakdown.


What are the classifications of capacitors?

According to analysis and statistics, capacitors are mainly divided into the following 10 categories: 1. According to structure, they are divided into three categories: fixed capacitors, variable capacitors, and fine tuning capacitors. 2. Classification by dielectric: organic dielectric capacitor, inorganic dielectric capacitor, electrolytic capacitor, electrothermal capacitor, air dielectric capacitor, etc.


Function of capacitor

In a DC circuit, a capacitor is equivalent to an open circuit. A capacitor is a device that can store electric charges and is also one of the commonly used electronic components.