ISO 11452-10:2009

Overview

ISO 11452-10:2009 - "Road vehicles - Component test methods for electrical disturbances from narrowband radiated electromagnetic energy - Part 10" - specifies a conducted voltage test method to determine the immunity of electronic vehicle components to conducted disturbances in the extended audio frequency range. The standard applies to individual device leads (power, output, and low-frequency analogue leads) for passenger cars and commercial vehicles regardless of propulsion (combustion engine or electric drive). Disturbances covered are limited to continuous narrowband electric voltage waveforms.

Key topics and technical requirements

• Frequency range: 15 Hz to 250 kHz (user may reduce range for specific simulations).
• Source impedance: ≤ 0.5 Ω from 15 Hz to 50 kHz and ≤ 2 Ω from 50 kHz to 250 kHz (measured at isolation transformer secondary).
• Apparatus: audio oscillator (15 Hz–250 kHz), extended-range audio amplifier (≥50 W, low output impedance), isolation transformer (4:1 impedance ratio), voltage/current measuring instruments, power supply and optional 100 µF capacitor.
• Current limit: injected lead current shall not exceed 1 A rms.
• Measurement practices: use a 4 Ω non-inductive load as a substitute to set accurate test voltage when DUT impedance causes distortion; monitor DUT for malfunction or performance degradation; record frequency and threshold levels.
• Test planning: define set-up, frequency steps, DUT leads, mode of operation, acceptance criteria, severity levels (see Annex A Function Performance Status Classification), monitoring and reporting requirements.
• Verification: Annex B gives a procedure to verify source impedance across the frequency range.

Practical applications and users

• Who uses it: automotive OEMs, electronic component suppliers, EMC/EMI test laboratories, R&D teams and quality-control engineers who test in-vehicle modules (audio systems, displays, sensors, actuators).
• Why use it: to evaluate immunity of components with acoustic or visible display functions, validate designs against conducted narrowband interference, prevent audible/visible disturbances and ensure reliable operation under real-world electromagnetic environments.
• When to apply: during component development, pre-compliance testing, supplier qualification and production troubleshooting where lab-based component-level immunity data are needed without full vehicle testing.

Related standards

• ISO 11452-1: General principles and terminology
• ISO 11452-2: Absorber-lined shielded enclosure
• ISO 11452-3: TEM cell
• ISO 11452-4: Bulk current injection (BCI)
• ISO 11452-5: Stripline
• ISO 11452-7: Direct RF power injection
• ISO 11452-8: Immunity to magnetic fields
• ISO 11452-11: Radiated immunity using a reverberation chamber
  (ISO 11452-9 - Portable transmitters - under preparation)

Keywords: ISO 11452-10, conducted immunity, extended audio frequency range, road vehicles, DUT, isolation transformer, narrowband electromagnetic disturbances, automotive EMC.