Film capacitor power(II)

In practice, there is not always a DC bias voltage. Non-polar tantalum capacitors can also be manufactured, but they are more expensive and may not be used after storage. If two identical tantalum capacitors are connected back to back in series, a nonpolar capacitor can be obtained. The total capacitance is half of each series capacitor, which is C/2.

A good performance film capacitor at the moment of power supply, the multimeter's hands should have a larger swing; the greater the capacity of the film capacitor, the larger the swing of the hands, after the swing, the watch can gradually return to zero. If the capacitor is turned on at the moment when the power is turned on, the indicator of the multimeter will not swing, which means that the capacitor is in failure or open circuit; if the hands constantly indicate the supply voltage without swinging, it indicates that the capacitor has been punctured and short-circuited; if the hands move normally, they will not return to zero This shows that the capacitor has a leakage current.