Designing Business Machine Cabinets for Optimal EMI Shielding

However, the microprocessor is a device that uses digital circuitry operating at high frequencies. This means that the device can create impulses of energy, referred to as electromagnetic waves, that can interfere with radio, television, police communications, garage-door dpeners, pacemakers, aircraft navi­ gation equipment and other electronic devices. Plastics enclosures do not provide protection against the radiation of this energy — termed "electromagnetic interference," or EMI — into the surrounding environment.