Film capacitors are a type of capacitor with superior performance due to their non-polarity, high insulation impedance, excellent frequency characteristics (wide frequency response), and low dielectric loss. Therefore, film capacitors are widely used in analog circuits. Especially in signal coupling parts, capacitors with good frequency characteristics and extremely low dielectric loss must be used to ensure that signals are not significantly distorted during transmission. The quality requirements for film capacitors are high, and it is very important to conduct DC withstand voltage testing before leaving the factory. We also need to pay attention to some points during testing.
1. The load voltage must meet the DC withstand voltage requirements of the film capacitor manufacturer currently and in the future (the DC voltage withstood during the test is provided by a separately developed independent DC high-voltage power supply).
2. The reliability of the test system, whether it can ensure that the DC high voltage does not pose a threat or harm to operators, that is, ensure personal safety.
3. The system's anti-electromagnetic interference capability, whether it can ensure that the system can withstand electromagnetic interference in harsh external working environments without affecting operation, especially the test circuit and signal processing circuit, that is, ensure that the test system does not have problems.
4. Leakage current detection accuracy, which is an indicator used in the customer's actual production and relates to the parameter performance of the final product.
5. The processing capability of test signals, accurate conversion of leakage current detection results is required so that the equipment control unit can process the film capacitor in a timely manner.
6. Ensure the reliability of the test system, reduce the system failure rate, and enhance its redundancy.
7. The display of test results should be observable, and cost control should also be considered.
What to Pay Attention to in DC Withstand Voltage Testing of Film Capacitors 2.jpg
Current detection of film capacitors is very important, so there are many requirements during testing. If you have any other technical questions, please contact us, and we will do our best to solve them for you.
