First of all, before the metal film capacitor
is used, the quality of the metal film capacitor should be checked to prevent non-compliant capacitors from being installed in the circuit. Then, when designing the component installation, the metal film capacitor should be used, which will cause the capacitor to overheat and age prematurely. When installing small-capacity capacitors and capacitors for high-frequency circuits, brackets should be used to hold up the capacitors to reduce the impact of distributed capacitance on the circuit. When installing the electrolytic capacitor into the circuit, be sure to pay attention to its polarity not to be reversed, otherwise it will cause a large increase in leakage current and quickly heat the capacitor and damage it. It should also be noted that it is not easy to weld metal film capacitors for too long, because too long welding temperature will be transmitted to the internal dielectric of the capacitor through the electrode pins, which will change the performance of the dielectric. When metal film capacitors need to be used after long-term storage, the rated voltage cannot be directly applied, otherwise there will be a danger of explosion. The correct method of use is: first add a smaller working voltage, and then gradually increase the voltage to the rated voltage and keep it under this voltage for a not too long time, and then put it into use. When installing the capacitor in the circuit, the metal film capacitor's mark should be installed in an easy-to-observe position for verification and maintenance. When the capacitors are used in parallel, the total capacitance is equal to the sum of the respective capacities, but it should be noted that the working voltage of the metal film capacitors in parallel cannot exceed the lowest rated voltage.
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