WHAT IS EMI/RFI SHIELDING?

EMI/RFI stand for Electro Magnetic Interference (EMI) and Radio Frequency Interference (RFI). RFI is just EMI over the range of 1kHz-10GHz. Electro Magnetic Radiation and Radio Frequency Radiation are all around you. They interfere with sensitive components and circuits. Typical sources are power supplies, fluorescent lights, electric motors, switches, relays, and even IC's.

Shielding from EMI/RFI is done for two primary reasons: (1) to keep electronic device from interfering with others and (2) to keep other devices from interfering with yours.