BNC, C Series EMI Suppression Ferrite—The C Series Module Ferrite is an accessory that you can clamp on to external BNC cables to suppress electromagnetic interference (EMI). You can use the C Series Module Ferrite to ensure electromagnetic compatibility (EMC) performance for CompactDAQ and CompactRIO hardware such as specific C Series Sound and Vibration Input Modules, C Series Voltage Input Modules, and C Series Digital Modules.