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There are many ways to judge the quality of metal film capacitors. Let's take a look together:

Firstly, look at the appearance. If there is an issue with the appearance, it is likely that there is a problem with the thin film capacitor.

2. Use a multimeter to test the resistance range of the two pins of the thin film battery. The resistance value should be very high. If there is a capacitance meter, measure whether the capacitance value matches the mark on the shell.

3. Test performance at room temperature, including capacity, loss, insulation resistance, withstand voltage, ESR, etc. Focus on testing the performance of capacitors that require special attention.

4. Conduct simulated life tests. There is no problem with the normal test performance at room temperature, but it also depends on whether the lifespan can be sustained.

5. Choose a reputable capacitor manufacturer.

If the usage requirements are not high, you can buy some universal ones from the market and do your own copying machine test. If they pass, you can use them with confidence.

7. Thin film capacitors are capacitors made of metal foil as electrodes, which are overlapped with plastic films such as polyethylene, polypropylene, polystyrene, or polycarbonate at both ends and wound into cylindrical structures. According to the type of plastic film, it is also known as polyethylene capacitors, polypropylene capacitors, polystyrene capacitors, and polycarbonate capacitors.