Conducted Electrical Emissions From Type L-858 Style 2 and 3 Airfield Signs

Details

• Creators:
  Cyrus, Holly M. ; Nadel, Jess
• Corporate Creators:
  United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center. Airport and Aircraft Safety Research and Development Division. ; Hi-Tec Systems
• Corporate Contributors:
  United States. Department of Transportation. Federal Aviation Administration. Office of Aviation Research and Development
• Subject/TRT Terms:
  Airport Runways Air Traffic Control Air Traffic Flow Management Air Transportation Data Collection Electrical Systems Flicker Pollutants Signs
• Publication/ Report Number:
  DOT/FAA/AR-TN08/44
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Edition:
  Technical Note
• Corporate Publisher:
  United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center
• Abstract:
  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.
• Format:
  PDF
• Collection(s):
  FAA William J. Hughes Technical Center for Advanced Aerospace
• Main Document Checksum:
  urn:sha-512:fe2e1792cdce4c7e96d51575d7acfed7b991aded765b23cd84900b83727628f3b1a2805829ad872e878e1502aae338570931b354c1f9d0936a9697f0a7dce52c
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/90232/dot_90232_DS1.pdf
• File Type:
  [PDF - 868.35 KB ]