BS ISO 11452-9:2021

What is ISO 11452‑9 about?  

ISO 11452‑9 specifies test methods and procedures for testing electromagnetic immunity of electronic components for passenger cars and commercial vehicles to portable transmitters in close proximity, regardless of the propulsion system (e.g., spark-ignition engine, diesel engine, electric motor). 

The device under test (DUT), together with the wiring harness (prototype or standard test harness), is subjected to an electromagnetic disturbance generated by portable transmitters inside an absorber-lined shielded enclosure, with peripheral devices either inside or outside the enclosure. The electromagnetic disturbances considered are limited to continuous narrowband electromagnetic fields. 

Who is ISO 11452‑9 for? 

ISO 11452‑9 on component test methods for electrical disturbances from narrowband radiated electromagnetic energy of portable transmitters is applicable to: 

• Passenger cars and commercial vehicles manufacturers  
• Portable transmitters manufacturers  
• Vehicle electronic components manufacturers  

Why should you use ISO 11452‑9?  

Electronic components in vehicles can be damaged by electromagnetic interference. Electric and magnetic fields from the electronic ignition system affect the vehicle's electronic equipment. So it is necessary to make sure that electronic components are safe from electromagnetic interference. ISO 11452‑9 specifies test methods and procedures for testing electromagnetic immunity of electronic components for passenger cars and commercial vehicles to portable transmitters. 

ISO 11452‑9 gives guidelines regarding test instruments, test setup and test procedure so that you can carry out the tests to check immunity of electronic components for passenger cars and commercial vehicles to portable transmitters effectively. 

What’s changed since the last update?  

ISO 11452‑9:2021 edition cancels and replaces the first edition (ISO 11452‑9:2012), which has been technically revised. 

The main changes are as follows: 

• Change of the frequency range from 26 mhz – 5,85 ghz to 142 mhz – 6 ghz; 
• Suppression of test methodology with commercial transmitters
• Use of modulation from ISO 11452‑1
• Modifications of ground plane dimensions 
• Introduction of additional artificial networks (HV-AN, AMN, AAN) for DUT powered by a shielded power system
• Addition of test set-up descriptions and figures for HV power supply system; 
• Addition of wording for DUT, connector and harness testing
• Addition of new Annex A with description of test methodology for net power characterization procedure
• Addition in Annex C of microwave broadband dipole antenna and HF broadband sleeve antenna 
• Addition of Annex F on broadband noise source with arbitrary waveform generator