November 2004
Beginner
368 pages
19h 44m
English
Content preview from The Circuit Designer's Companion, 2nd Edition
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Grounding and wiring 27
Shielding and microphony
Shielding of data and multicore falls into three categories:
• copper braid. This offers a good general-purpose electrical shield but cannot
give 100% shield coverage (80–95% is typical) and it increases the size and
weight of the cable.
• tape or foil. The most common of these is aluminised mylar. A drain wire is
run in contact with the metallisation to provide a terminating contact and to
reduce the inductance of the shield when it is helically-wound. This
provides a fairly mediocre degree of shielding but hardly affects the size,
weight and flexibility of the cable at all.
• composite foil and braid. ...
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