ISO 11452-4-2020.pdf

### ISO 11452-4-2020: Road Vehicles – Component Test Methods for Electrical Disturbances from Narrowband Radiated Electromagnetic Energy – Part 4: Harness Excitation Methods #### Introduction ISO 11452-4:2020 is an international standard that focuses on the testing of road vehicle components to evaluate their resistance to electrical disturbances caused by narrowband radiated electromagnetic energy. This document specifically addresses the test methods for harness excitation. The standard is essential for ensuring the reliability and safety of automotive systems, particularly those that might be susceptible to electromagnetic interference (EMI). #### Scope (Section 1) The scope of ISO 11452-4:2020 outlines the application of the standard, which covers the testing procedures for electrical disturbances due to narrowband radiated electromagnetic energy. It aims to establish uniform methods for evaluating how automotive components respond to such disturbances. The scope emphasizes the importance of these tests in the development and validation phases of vehicle components. #### Normative References (Section 2) This section lists the documents that are referenced within the standard and are indispensable for its application. These documents include other ISO standards related to electromagnetic compatibility (EMC), which provide foundational guidelines and methodologies for conducting EMC tests. Ensuring compliance with these referenced documents is crucial for the accurate execution of the tests described in ISO 11452-4:2020. #### Terms and Definitions (Section 3) The terms and definitions section defines key concepts used throughout the standard. Understanding these terms is essential for interpreting the requirements and procedures correctly. Some of the terms you might encounter include: - **Narrowband Radiated Electromagnetic Energy**: Refers to the type of electromagnetic energy characterized by a relatively narrow frequency range, which can cause disturbances in electrical systems. - **Harness Excitation**: The method by which a vehicle’s wiring harness is intentionally exposed to electromagnetic energy to simulate real-world conditions and assess the component’s performance under such disturbances. - **Electrical Disturbances**: Unwanted changes in the electrical signals or power supply that can affect the functionality of electronic systems. #### Detailed Examination of Harness Excitation Methods The primary focus of ISO 11452-4:2020 is the harness excitation methods used to evaluate the impact of narrowband radiated electromagnetic energy on vehicle components. This involves exposing the vehicle’s wiring harness to controlled electromagnetic fields to simulate various environmental conditions and determine the system’s resilience. - **Test Setup**: The standard specifies the setup requirements for the test environment, including the dimensions of the test chamber, the positioning of the test object, and the configuration of the excitation source. These details are critical for replicating consistent test conditions across different laboratories and manufacturers. - **Excitation Levels and Frequencies**: Specific levels and frequencies of electromagnetic energy are prescribed to ensure that the tests are representative of potential disturbances encountered during normal operation. The excitation levels and frequencies are chosen to cover a range of scenarios, from mild to severe, to thoroughly assess the component’s robustness. - **Measurement Techniques**: Detailed procedures are provided for measuring the response of the tested components to the applied electromagnetic energy. This includes monitoring voltage levels, current flows, and signal integrity to identify any anomalies or failures. - **Evaluation Criteria**: Clear criteria are established for determining whether a component has passed or failed the test. These criteria consider the functional performance of the component and its ability to maintain safe and reliable operation despite exposure to electrical disturbances. - **Documentation and Reporting**: Comprehensive guidelines are given for documenting the test results and generating reports. This documentation serves as evidence of compliance and is crucial for manufacturers to demonstrate the safety and reliability of their products. In conclusion, ISO 11452-4:2020 is a comprehensive guide for testing the electromagnetic compatibility of road vehicle components. By following the detailed procedures outlined in this standard, manufacturers can ensure that their products meet the necessary safety and reliability standards, ultimately contributing to the overall quality and safety of automotive systems.