ISO 11451-1:2025

Overview

ISO 11451-1:2025 - Road vehicles - Vehicle test methods for electrical disturbances from narrowband radiated electromagnetic energy - Part 1: General principles and terminology - establishes the general principles, terminology and practical guidelines for vehicle-level immunity testing to continuous narrowband radiated electromagnetic fields. It applies to passenger cars and commercial vehicles regardless of propulsion (spark-ignition, diesel, hybrid, electric) and supports immunity testing over a wide frequency range (0.01 MHz to 18 000 MHz). This fifth edition updates modulation guidance, revises test network requirements and adds normative/ informative annexes for broadband signal generation and instrumentation uncertainty evaluation.

Key topics and technical requirements

• Scope and terminology: Definitions and core concepts used throughout the ISO 11451 series to ensure consistent EMC testing vocabulary.
• General test conditions: Environmental and electrical conditions such as test temperature, supply voltage states (including LV, charging and disconnected states for hybrid/electric vehicles), modulation, dwell time, and frequency step sizes.
• Severity levels and evaluation: Principles for defining test severity levels and evaluating function performance status classification (FPSC) after exposure.
• Instrumentation and networks: Requirements and guidance for test instrumentation including DC-charging artificial networks (DC-charging‑AN), artificial mains networks (AMN) and asymmetric artificial networks (AAN).
• Test procedures: Test planning and execution methods including substitution, closed-loop levelling, disturbance application processes and mandatory test reporting content.
• Annexes:
  • Annex A - FPSC classification (normative)
  • Annex B - DC-charging-AN, AMN, AAN (normative)
  • Annex C - constant peak test level for amplitude modulation (normative)
  • Annex D - broadband test signal generation (informative)
  • Annex E - evaluation of test instrumentation uncertainties (informative)

Applications and practical value

• Provides the foundation for vehicle EMC immunity testing against narrowband radiated fields used in development, validation and conformity assessment.
• Guides OEMs, EMC laboratories, component suppliers, and certification bodies on consistent test conditions and reporting for vehicle-level immunity.
• Supports assessment of vehicle electronic system robustness in real-world narrowband interference scenarios across the full vehicle fleet (ICE, hybrid, electric).
• Useful for designing mitigation measures (shielding, filtering, grounding) and verifying compliance to manufacturer specifications or regulatory requirements that reference ISO procedures.

Who should use this standard

• Automotive EMC engineers and test technicians
• Vehicle manufacturers and system integrators
• Accredited test laboratories and conformity assessment bodies
• Component suppliers involved in vehicle electronic subsystems
• Regulatory authorities and consultants involved in electromagnetic compatibility (EMC)

Related standards

• Other parts of the ISO 11451 series (vehicle-level radiated immunity test methods)
• ISO/IEC Directives referenced for standard development and editorial rules

Keywords: ISO 11451-1:2025, vehicle electromagnetic immunity, narrowband radiated electromagnetic energy, vehicle EMC testing, AMN, AAN, DC-charging-AN, function performance status, broadband test signal generation.