ISO 11451-2-2015 PDF

Full title and description

Road vehicles — Vehicle test methods for electrical disturbances from narrowband radiated electromagnetic energy — Part 2: Off-vehicle radiation sources. This part specifies a vehicle-level test method for evaluating immunity to narrowband radiated electromagnetic fields produced by off-vehicle radiation sources; it is intended for passenger cars and commercial vehicles and can be applied to other vehicle types.

Abstract

ISO 11451-2:2015 defines procedures, test geometry and measurement practices for exposing complete vehicles to narrowband radiated electromagnetic fields generated by external (off-vehicle) sources in order to assess the immunity of on-board electrical/electronic systems. The procedure sets out test conditions, antenna placement and reference points, severity levels and performance assessment criteria for reproducible vehicle-level EMC testing.

General information

• Status: Withdrawn (superseded by a new edition published in 2025).
• Publication date: 2 June 2015.
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 33.100.20 (Immunity); 43.040.10 (Electrical and electronic equipment).
• Edition / version: Edition 4 — ISO 11451-2:2015.
• Number of pages: 25 pages (2015 edition).

Scope

Specifies a repeatable test method for determining the immunity of passenger cars and commercial vehicles to narrowband radiated electromagnetic energy from off-vehicle sources. The standard is applicable regardless of vehicle propulsion system (internal combustion, hybrid, electric) and focuses on continuous narrowband fields; users select appropriate frequency ranges and severity levels for the tests.

Key topics and requirements

• Definition of test geometry and vehicle positioning (including reference point centre and antenna/bumper geometry).
• Controlled exposure procedures using off-vehicle radiating antennas (absorber-lined shielded enclosures or equivalent test sites).
• Frequency planning and selectable test frequency ranges for narrowband immunity testing.
• Specification of field strength/severity levels and guidance on choosing test severity.
• Measurement and instrumentation requirements for field uniformity and calibrated antenna systems.
• Performance criteria and assessment of vehicle function performance during and after exposure.
• Normative references and alignment with other vehicle EMC parts (general principles, on-board simulation, harness excitation, reverberation chamber methods).

Typical use and users

Used by vehicle OEM EMC engineers, test laboratories, regulatory bodies, and suppliers of vehicle electrical/electronic systems to verify vehicle-level immunity to external RF sources during development, validation and type-approval activities. It supports decision-making on design changes, shielding, grounding and filtering to mitigate susceptibility to radiated narrowband fields.

Related standards

Part of the ISO 11451 series: ISO 11451-1 (general principles and terminology), ISO 11451-3 (on-board transmitter simulation), ISO 11451-4 (harness excitation methods) and ISO 11451-5 (reverberation chamber methods). It is also used alongside component- and equipment-level EMC standards such as the ISO 11452 series and measurement standards referenced (for example CISPR/IEC references used for instrumentation and test methods).

Keywords

vehicle EMC; radiated immunity; narrowband; off-vehicle radiation; absorber-lined shielded enclosure; antenna geometry; reference point centre; D-bumper; field strength; severity levels; ISO 11451.

FAQ

Q: What is this standard?

A: ISO 11451-2:2015 is an international vehicle-level EMC test standard that prescribes methods to assess the immunity of complete vehicles to narrowband radiated electromagnetic fields from off-vehicle sources.

Q: What does it cover?

A: It covers test arrangement and geometry, antenna placement and calibration, selectable frequency ranges for narrowband exposure, field strength/severity levels, measurement procedures and criteria for assessing vehicle function performance under exposure.

Q: Who typically uses it?

A: Vehicle OEM EMC teams, independent EMC test laboratories, electronic systems suppliers, and regulatory or certification bodies use the standard for development testing, validation and compliance evaluation of vehicle electromagnetic immunity.

Q: Is it current or superseded?

A: The 2015 edition has been withdrawn and superseded by a later edition published in 2025; users should consult the 2025 edition (ISO 11451-2:2025) for the current, authoritative procedures and any technical updates or expanded guidance.

Q: Is it part of a series?

A: Yes — it is part of the ISO 11451 series of vehicle-level immunity standards (Parts 1 through 5) and is commonly used together with the ISO 11452 series for component/equipment-level tests and with other EMC measurement standards.

Q: What are the key keywords?

A: vehicle EMC, radiated immunity, narrowband, off-vehicle source, antenna calibration, absorber-lined shielded enclosure, severity level, reference point centre.