Flexible flat cable (FFC) is a critical signal transmission medium in electronic devices, and its quality directly impacts the stability and reliability of the device. To ensure that FFC performance meets standards, a systematic inspection process is rigorously controlled. The following is a detailed description of the core inspection steps.
Appearance inspection is the first step. Visually or with a magnifying glass, inspect the cable surface for scratches, indentations, stains, or oxidation marks. Focus on inspecting the conductors for breakage, misalignment, or potential short circuits. Also, verify that the insulation is free of bubbles, delamination, or damage, and that the edges are flat and free of burrs. These defects can lead to electrical failures during subsequent use.
Dimensional measurement requires precision tools. According to industry standards, cable thickness, width, and conductor spacing are inspected to ensure they meet design requirements, with tolerances typically within ±0.05mm. Use a micrometer or optical measuring instrument to ensure accurate data to avoid dimensional deviations that could affect connector compatibility.
Electrical performance testing is a key step. Use a multimeter or dedicated impedance analyzer to measure conductor continuity and verify any breaks or poor contact. The withstand voltage test applies a rated voltage (e.g., 500V DC) for at least 1 minute to ensure no insulation breakdown. Furthermore, the insulation resistance between conductors is tested, typically requiring ≥100MΩ, to ensure stable signal transmission.
Mechanical performance evaluation includes bending and tensile testing. The cable is repeatedly bent at a fixed radius (e.g., R = 3mm) for more than 1,000 times to observe any conductor breakage or insulation cracking. The tensile test simulates the stresses encountered during installation to ensure the cable's structural integrity under a rated tensile force (e.g., 5N).
Finally, the environmental adaptability test simulates performance in extreme conditions, such as high temperature (85°C), low temperature (-40°C), or high humidity (95% RH), to verify long-term reliability.
Through these multi-dimensional tests, the quality of FFCs is fully guaranteed, laying the foundation for the stable operation of electronic devices. This rigorous process not only complies with industry standards but also demonstrates a key commitment to end users.