What is ISO 11452‑4 about?
ISO 11452‑4 is part four of the multi-series standard that specifies harness excitation test methods and procedures for determining the immunity of electronic components of 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.
Note-
The electromagnetic disturbances considered in ISO 11452‑4 are limited to continuous narrowband electromagnetic fields.
Who is ISO 11452‑4 for?
ISO 11452‑4 on harness excitation methods is useful for:
- Vehicle manufacturers
- Electronic components designers and manufacturers
- Vehicle testing facilities
- Automotive engineers
Why should you use ISO 11452‑4?
Vehicles have a large number of electronic components in them. The safety of those components is vital. Any malfunction can be hazardous. ISO 11452‑4 specifies harness excitation test methods and procedures for determining the immunity of electronic components of passenger cars and commercial vehicles.
ISO 11452‑4 describes the test conditions, location and instruments to be used which will help you carry out the test accurately and efficiently.
ISO 11452‑4 provides test setup and test procedure for the DUT powered by shielded and unshielded power system.
What’s changed since the last update?
BS ISO 11452‑4:2020 is the fifth edition that replaces the fourth edition (ISO 11452-4:2011), which has been technically revised.
The main changes compared to the previous edition are as follows:
- Extension of the frequency range for BCI test method down to 100 khz
- Introduction to reference to additional artificial networks (HV-AN, AMN, AAN) for DUT powered by a shielded power system
- Precisions for ground plane dimensions
- Addition of test set-up descriptions and Figures for DUT powered by a shielded power system
- Precisions for DUT with multiple connectors
- Suppression of Annex C relative to artificial networks which are now defined in ISO 11452-1