Master Catalog Page 541 Signal Interference and Shielding

Alpha Wire www.alphawire.com 1-800-52 ALPHA Specifications subject to change. For complete specifications and availability, visit www.alphawire.com. 541 Shielding where C = Number of carriers D = Diameter under shield, inches d = Diameter of one strand, inches P = Picks per inch a = Shield angle, degrees K = Percent coverage, where and N = Number of strands per carrier Shield Resistance The D.C. resistance for braided shields can be calculated using the following equation: where R = D.C. resistance, ohms/ unit length dR = D.C. resistance of 1 strand end, ohms/unit length N = Number of strand ends in one carrier C = Number of carriers Shielding Performance The shielding of electronic interconnect cables can play a critical role in overall system performance. System configuration, type of signals transmitted and proximity to noise generating sources all must be considered. These factors plus the type of interference, whether electromagnetic, electrostatic discharge (ESD) or radio frequency, will determine the necessity and type of shielding required. Alpha's Xtra- Guard cables are available in two shielded constructions providing protection for the majority of installation needs. Shield Coverage: Braided Shield The effectiveness of a braided shield depends upon the percent coverage afforded by the shield. Leakage in a braided shield is due to air spaces which exist between the weave. The following equation can be used to determine the percent coverage of a braided shield.

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