BS ISO 11451-4:2022 Road vehicles. Vehicle test methods for electrical disturbances from narrowband radiated electromagnetic energy. Part 4: Harness excitation methods
1 Scope
This document specifies harness excitation methods for testing the electromagnetic
immunity of electronic components for passenger cars and commercial vehicles regardless
of the propulsion system (e.g. spark-ignition engine, diesel engine, electric motor).
The bulk current injection (BCI) test method is based on current injection into the
wiring harness using a current probe as a transformer where the harness forms the
secondary winding. The tubular wave coupler (TWC) test method is based on a wave coupling
into the wiring harness using the directional coupler principle.
The TWC test method was developed for immunity testing of automotive components with
respect to radiated disturbances in the GHz ranges (GSM bands, UMTS, ISM 2,4 GHz).
It is best suited to small (with respect to wavelength) and shielded device under
test (DUT), since in these cases the dominating coupling mechanism is via the harness.
The electromagnetic disturbance considered in this document is limited to continuous
narrowband electromagnetic fields.
ISO 11451‑1
gives definitions, practical use and basic principles of the test methods.
BS ISO 11451-4:2022 history
2022BS ISO 11451-4:2022 Road vehicles. Vehicle test methods for electrical disturbances from narrowband radiated electromagnetic energy. Part 4: Harness excitation methods
2013BS ISO 11451-4:2013 Road vehicles. Vehicle test methods for electrical disturbances from narrowband radiated electromagnetic energy Bulk current injection (BCI)