British Standards Institution

Source:: CEN
Committee:: ACE/6 - Aerospace avionic electrical and fibre optic technology
Categories:: Aerospace electric equipment and systems
Comment period start date:: 01/05/2025
Comment period end date:: 24/06/2025
Number of comments:: 0

Comment by:

24th Jun

Scope

This document specifies methods for measuring return loss respectively voltage standing wave ratio (VSWR), in the required frequency range of coaxial cables.

The return loss is used for quantifying the level of the reflected signal due to an impedance mismatch between the cable and the reference impedance and due to structural variations of the impedance along the cable.

It is intended to be used together with EN 3475‑100 and EN 50289‑1‑11.

NOTE In particular, correction procedures detailed in EN 50289‑1‑11:2016, Annex B are important to minimize negative effects of cable preparation in the purpose of high frequency range measurements.

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Please email further comments to: debbie.stead@bsigroup.com

Standard timeline

1. Proposal (Complete)

Proposal start date:

2. Draft (Complete)

Draft start date:

15/04/2025

3. Public Comments

Public Comments start date:

01/05/2025

Public Comments end date:

24/06/2025

4. Comment Resolution

Comment Resolution start date:

15/09/2026

5. Approval

6. Publication

Publication start date:

19/01/2027

Learn more about the standards development process

Standards Development

BS EN 3475-812 EN 3475-812 Aerospace series. Cables, electrical, aircraft use. Test methods. Part 812: Return loss (VSWR)

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