CBB capacitor detection method (3)

2. Check if the CBB capacitor from 10pF to 0 01uF is charged, and then judge whether it is good or bad. The multimeter uses R × 1k block. The beta values of the two triodes are all above 100 and the penetration current is small. The red and black test leads 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 capacitor is amplified, so that the multimeter pointer swing amplitude is increased, thereby facilitating observation. It should be noted that during the test, especially when measuring the capacitance of a small capacity, it is necessary to repeatedly exchange the two points of the measured capacitor pins to contact A and B to clearly see the swing of the multimeter pointer.

3. For fixed capacitors above 0 01uF, use the R×10k block of the multimeter to directly test the capacitor for charging process and whether there is internal short circuit or leakage, and estimate the capacity of the capacitor according to the amplitude of the pointer swinging to the right.