CBB capacitance detection method (2)

Due to its widespread use, we need to understand some common CBB capacitance detection methods:

First, detect small capacitors below 10pF. The capacity of the fixed capacitor below 10pF is too small, use the multimeter to measure, can only qualitatively inspect whether there is leakage, internal short circuit or breakdown phenomenon. When measuring, use the multimeter R×10k block, and connect the two pins of the capacitor to the two pins of the capacitor. The resistance value should be infinite. If the resistance is measured (the pointer swings to the right) is zero, it indicates that the capacitor is damaged by leakage or internal breakdown.

Second, detect 10pF ~ 0 01uF CBB capacitor charging phenomenon, and then determine its good or bad. The multimeter uses R×1k block. Both triodes have a beta value of more than 100 and a small penetration current. The red and black pens of the multimeter are respectively connected to the emitter e and the collector c of the composite tube. Due to the amplification effect of the composite triode, the charging and discharging process of the measured capacitance is amplified, so that the amplitude of the pointer of the multimeter is increased, thereby facilitating observation. It should be noted that: During the test, especially when measuring a small-capacity capacitor, it is necessary to repeatedly exchange the measured capacitance pin contacts A, B two points in order to clearly see the multimeter pointer swing.

Third, for 0 01uF fixed capacitor, you can use the multimeter's R × 10k block to directly test whether the capacitor charging process and whether there is an internal short circuit or leakage, and according to the amplitude of the pointer to the right swing size estimate the capacity of the capacitor.