Std 1143-1994 IEEE Guide on Shielding Practice for Low by Ryan Russell, Riley Eller, Jay Beale, Chris Hurley, Tom

By Ryan Russell, Riley Eller, Jay Beale, Chris Hurley, Tom Parker, Brian Hatch, Timothy Mullen

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Additional info for Std 1143-1994 IEEE Guide on Shielding Practice for Low Voltage Cables (Ieee Std 1143

Sample text

Recommended guidelines for testing are given in Docket 80–284 [B19]. The open field test site consists of a fiat concrete slab covered by a heavy wire screen to create a ground plane. A sample of cable is mounted on nonmetallic support poles and a movable antenna is used to detect radiated emissions from the cable. Open field site measurements are conducted with a spectrum analyzer, tracking generator, and broadband or tuned antennas. To measure radiated emissions (egress), the antennas are used according to FCC guidelines.

In particular, large transients generated outside the building (such as power switching transients or lightning) can be almost totally excluded from the sensitive integrated circuits inside the equipment case, since these waves are interrupted by several layers of shielding. Yet the safety requirements are satisfied, since within any shielded volume, all cases, racks, and equipment are grounded to the local shield structure. In addition, dc and 60 Hz fault currents can flow to actuate fuses and circuit breakers, since the shields are transparent to power frequencies.

Control—Regulate motor speed and direction; set and maintain temperature, pressure, exposure or reaction time, and other control functions within precise limit points by activating relays, switches, valves, and motor controls These functions result directly from data acquisition and signal transmission between remote sensors, controllers and computers, and process devices. Cables to carry data and signals are available in several “standard” configurations. The selection of any particular one depends on the volume and type of data transmitted, the operational environment, and the required degree of reliability.

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