How to select the shielding component for the PMS interface of an electrical force measurement switch?

The selection of shielding components (such as shielded connectors, feedthrough capacitors, and conductive gaskets) for interfaces (such as RS485, USB, and power) on the PMS chassis directly affects the shielding effectiveness at that location. Selection criteria include: frequency range, shielding effectiveness (SE), current capacity, and mounting method. Connectors should be metal-cased models with 360° shielded connections, such as D-Sub and RJ45 with metal shells and spring contacts. Shielding effectiveness should be at least 60dB (at 1GHz). For high-current interfaces such as power supplies, filter connectors with integrated π-type filter circuits can be used. Feedthrough capacitors are used to shield high-frequency signals, and their self-resonant frequency must be higher than the interference frequency. Conductive gaskets (such as conductive foam and metal mesh gaskets) are used to fill the gap between the connector and the chassis panel; their selection should be based on compression ratio, conductivity, and environmental durability. All shielding components must achieve a low-impedance connection with the chassis panel, typically requiring a contact resistance of <10mΩ. Cost, installability, and reliability should also be considered during selection. Selecting the right shielding components is a crucial step in ensuring the overall shielding integrity of the chassis.