ISO 11452-8:2015

Overview

ISO 11452-8:2015 - "Road vehicles - Component test methods for electrical disturbances from narrowband radiated electromagnetic energy - Part 8: Immunity to magnetic fields" defines laboratory test methods to verify the magnetic-field immunity of electronic components used in passenger cars and commercial vehicles (regardless of propulsion: ICE, diesel, electric). The standard covers exposure to continuous narrowband magnetic fields from internal sources (motors, actuators) and external sources (power transmission lines, generating stations) and prescribes how to generate, monitor and report these magnetic disturbance tests.

Key technical topics and requirements

• Scope & frequency range: Tests are specified for d.c. and 15 Hz to 150 kHz. Specific frequencies include d.c., 16.67 Hz, 50 Hz, 60 Hz, 150 Hz and 180 Hz; step sizes (linear/log) are defined and configurable when susceptibility thresholds are near the test level.
• Test methods: Two primary field-generating techniques:
  • Radiating loop method - suitable for small DUTs or larger DUTs by scanning/positioning the coil; MIL‑STD‑461F style loop recommended (120 mm diameter, 20 turns). Not suitable for high-level d.c. fields without specialized coils.
  • Helmholtz coil method - used to produce a uniform magnetic field (±10%) over a volume (minimum ~300×300×300 mm). Coil geometry and current determine field strength; coils must avoid self-resonance below 150 kHz.
• Instrumentation & monitoring:
  • Current monitor: true‑RMS measurement across d.c. and 15 Hz–150 kHz (clamp probe or shunt).
  • Magnetic field monitor: Hall sensors for d.c. (capable to at least 3 000 A/m) and loop sensors for f ≥ 15 Hz (typical loop: 40 mm diameter, 51 turns).
• Test set-up & reporting: References ISO 11452-1 for general test conditions (temperature, supply voltage, dwell time), defines test locations, test harness placement, and requires documentation of test severity levels and frequency steps. Annex A provides function performance status classification (FPSC) and suggested severity levels.
• Safety & normative refs: Follow personnel protection guidelines (national regs, ICNIRP). Normative references include ISO 11452-1 and VG 95377-13.

Practical applications - who uses ISO 11452-8

• Automotive OEMs and tier‑1 suppliers validating ECUs, sensors, actuators, and power electronics against magnetic disturbances.
• EMC test laboratories performing component-level immunity testing during R&D, pre‑compliance, and production verification.
• Design and validation engineers using the standard to reproduce internal (vehicle) and external (grid/lines) magnetic interference scenarios and to identify robustness issues.
• Quality and safety teams documenting compliance and creating test reports for vehicle integration.

Related standards

• ISO 11452 series (Part 1 general principles; Part 2 absorber‑lined enclosure; Part 3 TEM cell; Part 4 harness excitation; Part 5 stripline; Part 7 direct RF injection; Part 9 portable transmitter; Part 10 extended audio freq.; Part 11 reverberation chamber)
• VG 95377‑13 (measuring coils / field probes)
• MIL‑STD‑461F (radiating loop reference)

Keywords: ISO 11452-8, immunity to magnetic fields, radiating loop, Helmholtz coil, automotive EMC, component test, magnetic field strength, narrowband electromagnetic fields.