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Safety measuring capacitance is broken?

by:SMiLer     2021-02-27
Safety capacitance is broken how to measure one: fixed safety capacitance detection 1, 10 pf the following small capacitance for fixed safety capacitance is too small, under 10 pf the multimeter to measure, only qualitative to check whether there is leakage, its internal short circuit or breakdown phenomenon. Measurement, can choose multimeter R x 10 k block, two pens and arbitrary by capacitance respectively two pins, resistance should be infinite. If the measured resistance ( A pointer to the right) Is zero, then illustrate capacitor leakage internal breakdown or damage. 2, detection of 10 ~ 0 01 u F pf fixed safety capacitance charging phenomenon, and then judge the good or bad. Multimeter use R x 1 k. Two triode beta are more than 100, and through the electric current is smaller. Can choose 3 dg6 models of silicon triode pipe etc. Multimeter of red and black pens and respectively with multiple tube of the emitter and the collector e c. Due to the amplification effect of compound triode, the measured capacitance charging and discharging process of amplification, the multimeter pointer swing amplitude increase, thus convenient for observation. Is that should be paid attention to: * for the tests, especially in the smaller capacity measurement of safety capacitor, repeatedly measured capacitance pin switch contact with A and B two points, can clearly see the motion of the pointer multimeter. C for safety capacitance 0 01 u F above, can use a multimeter R x 10 k block capacitor test failures directly charging process and presence of internal short circuit or leakage, and according to the range of a pointer to the right size to estimate the capacity of capacitor. 1, 2: safety of capacitor testing because capacity of electrolytic capacitor is fixed capacity is much bigger, so the JEC safety capacitance in the measurement, should according to different capacity to choose the appropriate range. According to experience, under normal circumstances, the capacitance between 1 ~ 47 u F, R x 1 k block measurement are available, and more than 47 u F R x 100 block measurement of capacitance available. 2, the multimeter red pens and negative, black pens and meet positive, at the moment just contact, multimeter pointer deflection is larger partial degrees to the right ( For the same electric block, the bigger the capacity, the greater the swing) , then gradually turning to the left until the stop at a particular location. At this time of the resistance value is positive leakage resistance of electrolytic capacitors, this value is slightly bigger than the reverse leakage resistance. Practical experience shows that the leakage resistance of the electrolytic capacitor shall generally be in more than a few hundred k Ω, otherwise, will not work properly. If during the test, the forward and reverse the phenomenon of no charge, whose hands, which shows capacity disappear or internal circuit; If the measured value is small or zero, capacitor leakage is big or has broken down, cannot be used again. 3, the positive and negative sign of unknown electrolytic capacitor, can use the method that the measurement of leakage resistance to discrimination. The arbitrary measure leakage resistance, first remember its size, and then exchange pens and a resistance is measured. Two measurement of resistance that is a big positive connection, the black pens and pick up the positive, red pens and pick up is negative. D use multimeter electric block, using positive and reverse charge for electrolytic capacitor method, according to the size of the oscillation amplitude to the right hand side, can estimate the capacity of electrolytic capacitors.
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