SIST EN 3475-808:2004

Overview

EN 3475-808:2002 is a CEN/AECMA aerospace test standard that specifies methods for measuring cross-talk in multicore electrical cables for aircraft use. Intended to be used together with EN 3475-100 (General test methods), this part defines how to prepare specimens, connect cable pairs, and perform measurements to quantify electromagnetic coupling between adjacent pairs (near‑end and far‑end cross‑talk) on a representative cable section.

Key Topics

• Scope: Measurement procedures for cross-talk of multicore aerospace cables; applicable when used in conjunction with EN 3475-100.
• Specimen preparation: Stripping, preparation and connection of cable ends to test equipment in accordance with the general test part.
• Test length: Unless otherwise stated in the product standard, measurements are performed on a 10 m cable section.
• Connection practice: Each pair is terminated at both ends with a resistor equivalent to the pair characteristic impedance (Zo). Connections at terminations must be kept as short as possible to reduce end interaction.
• Measurement modes: Defines measurements in asymmetric (near‑end) and symmetric (far‑end) configurations (illustrated in the standard’s figures).
• Test instrumentation and setup:
  • Signal generator with output impedance matched as closely as possible to Zo.
  • High‑input‑impedance voltmeter or oscilloscope to measure voltages at the emittive pair input and at adjacent pair near and far ends.
• Result expression: Cross-talk is expressed as attenuation in decibels, calculated from the measured voltages (near‑end and far‑end voltage ratios) over the specified frequency band. Acceptance levels are determined by the relevant product standard.

Applications

• Ensuring electromagnetic compatibility (EMC) performance of aerospace cables in aircraft wiring harnesses.
• Verifying that multicore cable designs meet specified cross-talk attenuation requirements for data, control and power signal integrity.
• Used by:
  • Cable manufacturers for product qualification and design verification.
  • Aerospace OEMs and suppliers for procurement, acceptance testing and qualification.
  • Test laboratories performing compliance tests to aerospace standards.
  • Design and integration engineers validating wiring harness performance in avionic systems.

Related Standards

• EN 3475-100 - Aerospace series: Cables, electrical, aircraft use - Test methods - Part 100: General (mandatory companion document).
• Product‑specific EN 3475 parts that specify acceptance levels and frequency bands for particular cable types.

Keywords: EN 3475-808, cross-talk test, aerospace cables, multicore cables, crosstalk attenuation, test methods, EN 3475-100, aircraft electrical cables.