1, the fixed capacitor testing. A little below the detection 10pF 10pF capacitance due to the following fixed capacitor capacity is too small to measure with a multimeter can only check whether there are qualitative leakage, an internal short circuit or breakdown phenomenon. Measurements may make use of multimeter R × 10k block, with two tables document were two random access pin capacitance, resistance should be infinite. If the measured resistance value (a pointer to the right swing) is zero, it indicates damage to capacitor leakage or internal breakdown. B test 10PF ~ 001μF capacitors have charged a fixed phenomenon, to judge that good or bad. Multimeter used R × 1k block. 2 Transistor β values are above 100, and the tunneling current to be small. Optional 3DG6 silicon transistor models such as the composition of composite pipe. Multimeter's red and black table document separately with composite pipe collector emitter e and c phase. As the composite triode amplification, the measured charging and discharging of capacitors to be enlarged, so that the pointer put multimeter range to increase, thus easy to observe. It should be noted: In the test operation, especially in the smaller capacity of the capacitance measured when the measured capacitance pin to repeatedly swap contacts A, B two points clear to see that the multimeter pointer to swing. C for more than a fixed capacitor 001μF, R × 10k multimeter can be used directly to test blocking capacitor charging process, and whether with or without internal short circuit or leakage, and according to the size of a pointer to the right swing of the magnitude estimated capacitances.

2, electrolytic capacitor testing. A because the electrolytic capacitor is much greater than the average fixed capacitor, so measurements should be suitable for use in different capacity range. Experience, under normal circumstances, 1 ~ 47μF capacitor between, can be R × 1k block measurement, greater than 47μF capacitance measurement can be R × 100 block. B will multimeter red table document connected with negative, positive black table document access in the new to the moment, multimeter pointer deflection is greater skewness to the right (for the same power block, the greater the capacity, the greater the swing), then gradually turn to the left until it stopped at a certain location. At this point the resistance is positive electrolytic capacitor leakage resistance, this value is slightly larger than the reverse leakage resistance. Actual experience shows that the leakage resistance of electrolytic capacitors should generally be in the hundreds of kΩ or more, otherwise, will not work. In the test, if positive, no charge reverse phenomenon, that gauge needles do not move, it indicates the capacity disappeared or internal circuit;, if the measured resistance is small or zero, indicating a large capacitor leakage or breakdown damage can no longer use. C  for positive and negative signs of unknown electrolytic capacitor can be measured using the above method to determine leakage resistance. The first look at any measure leakage resistance, remember its size, and then exchange the table document a resistance measured again. Two major resistance measurement that is positive then the first method, the black table document received is positive, red table document received is negative. D  use multimeter power block, to the electrolytic capacitor is used, reverse charge method, according to the size of a pointer to the right swings, can be estimated from the capacity of electrolytic capacitors.

3, test A variable capacitor gently rotating shaft, should feel very smooth and should not feel tight and sometimes loose even when the cable wiring. Will contain the axial front, back, up, down, left, right, etc. to promote in every direction, the shaft should not be loose phenomenon. B rotating shaft with one hand, one hand moving film set light touch the outer edge, should not feel any loosening. Poor contact between the shaft and the moving film variable capacitors, can not continue to use. C will be placed on R × 10k Multimeter block, a hand to pick the two tables document are dynamic and variable capacitor chips and fixed terminal piece, one hand slowly rotating the shaft a few back and forth, multimeter pointer must be Fixed position in infinity. In the rotating shaft of the process, if the pointer sometimes point to zero, which evidences that exist between film and short films set point; if you encounter a particular point of view, multimeter reading is not infinite but have certain resistance, indicating dynamic variable capacitor between the film and the stator leakage phenomenon.