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原文传递 Conducted Electrical Emissions from Type L-858 Style 2 and 3 Airfield Signs. Technical note.

题名：	Conducted Electrical Emissions from Type L-858 Style 2 and 3 Airfield Signs. Technical note.
作者：	Cyrus-H.M.; Nadel-J.
关键词：	Airfield-signs; Conducted-electrical-emissions.;Type-L-858; Style-2; Style-3.
摘要：	This study investigated the conducted electrical emissions from Type L-858 style 2 and 3 airfield signs that cause the signs to flicker on and off. These emissions are caused by the internal power supply of the style 2 and 3 signs. These signs are designed to operate at a constant intensity on a series circuit with other lighting equipment that operates with either a three- or five-step intensity constant current regulator. The test setup consisted of an airfield sign power supply and three subsystems: (1) a circuit current control that provided constant current to the power supply, (2) a line impedance stabilization network that provided a 60-hertz sign wave to the sign power supply, and (3) a data acquisition system. For style 2 and 3 signs that include internal power supplies, the level of emissions should not exceed -6 decibel milliamperes (dBmA) for proper operation. Circuits that include style 2 or 3 signs should be run in separate conduits to prevent operational problems if the emissions exceed -6 dBmA. The practice of double-circuiting should be used when the circuits outbound and return cables are in the same conduit with no single-conductor runs. This will reduce the potential for crosstalk. The use of line filters should be considered for these signs if no other means is practical.
报告类型：	科技报告