Example of how to shield Radio Frequency Interference [RFI] from a chassis  --------------------------------------------------------------------------------- The graphic shows four different methods to shield incoming cables into a chassis. The first approach is to add a Feed through capacitor at the bulk head, and a bypass capacitor Next a shield is added around the wire to increase the protection. An additional bypass capacitor is added after an additional RFC [Radio Frequency Choke] The last approach shown places the RFC in it's own shielded box with feed-through capacitors at each end. When feed-through capacitors are added as part of a connector, the connector is called Pin-Filtered. ESD connectors have a faraday cage which protects the components inside the connector from electrostatic discharges RFI Connector Cap Manufacturers Two additional approaches to reduce the effect of Electromagnetic Interference [EMI]: Use fiber optic cable which is immune to all electrical noise. A Twisted cable pair could be used which would cancel out the noise at the receiver, but allow the noise into the system. Twisted Shielded cable could also be used. More information on Designing an Equipment Chassis. |