IEC TS 61000-5-9:2009 PDF

Overview

IEC/TS 61000-5-9:2009 - Electromagnetic compatibility (EMC) - Part 5-9 - provides a system-level methodology to assess the susceptibility of electronic systems to HEMP (High-altitude Electromagnetic Pulse) and HPEM (High Power Electromagnetic) environments. The Technical Specification describes assessment techniques, their advantages and limitations, and worked examples for systems comprised of subsystems, equipment and external wired or wireless connections. It is a basic EMC publication (IEC Guide 107) and gives general installation and mitigation guidance without addressing safety or overlapping ITU‑T telecom protection work.

Key topics

• System-level susceptibility methodology: staged approach including subsystem characterization, system analysis, system testing (low-level and high-level) and overall susceptibility assessment.
• Interaction mechanisms: discussion of front-door coupling (direct radiated or conducted entry points) and back-door coupling (indirect or secondary paths).
• Protection methods: overview of mitigation techniques such as shielding, grounding, filtering, surge protection and interface hardening (advantages/disadvantages are compared).
• Test techniques: low-level and high-level test descriptions, use of reverberation chambers, microwave injection, transient testing and high-power radiated testing.
• Measurement, modelling and analysis: practical measurement practices, computational electromagnetics, transfer-function approaches, data processing and interpretation.
• Annex guidance: informative annexes cover classification of effects, measurement best practice, computational EM, HEMP and HPEM system assessment examples, limitations and detailed test techniques.

Applications

IEC/TS 61000-5-9 is intended for use when evaluating and hardening systems against EMI from extreme transient electromagnetic environments:

• System integrators and EMC engineers performing susceptibility assessments and qualification testing.
• Designers of critical infrastructure (power utilities, transport, aerospace, defence, industrial control, data centers) planning mitigation and resilient architectures.
• Test laboratories and facility operators choosing test methods (reverberation chambers, high-power radiators, transient injection).
• Project teams evaluating external connections (wired/wireless) and interface vulnerabilities.

Who benefits

• EMC specialists, system architects and facility engineers seeking structured, system-level HEMP/HPEM assessment guidance.
• Procurement and risk teams needing criteria to compare mitigation options and test strategies.
• Regulators and infrastructure owners aiming to improve electromagnetic resilience of complex systems.

Related standards

• IEC 61000 series (general EMC principles and test methods)
• IEC Guide 107 (basic EMC publication status)
• Relevant telecom protection work (ITU‑T) - IEC/TS 61000-5-9 is complementary and does not conflict with ITU‑T activities.

Keywords: IEC TS 61000-5-9:2009, HEMP, HPEM, EMC, system-level susceptibility, electromagnetic pulse, mitigation, reverberation chamber, EMI assessment.