Technical Articles

What is IEC 61000-4-21:2016-AMD1:2018? .


The field of electrical engineering constantly evolves to ensure the safe and reliable functioning of electronic devices. One crucial aspect in this field is electromagnetic compatibility (EMC), which deals with the ability of a device or system to function properly without producing any electromagnetic interference (EMI) or being affected by external sources of EMI. In order to regulate and standardize EMC testing, the International Electrotechnical Commission (IEC) has established various standards. Among them, IEC 61000-4-21:2016-AMD1:2018 focuses on the measurement and evaluation of repetitive electrical fast transients.

Understanding IEC 61000-4-21:2016-AMD1:2018

Electrical fast transients refer to transient disturbances caused by abrupt changes in voltage or current, typically lasting less than a microsecond. These transients can lead to malfunctions or damage to electronic equipment. IEC 61000-4-21:2016-AMD1:2018 provides guidelines for assessing the immunity of equipment against electrical fast transients up to 400 V levels.

The amended version of the standard, IEC 61000-4-21:2016-AMD1:2018, introduces several updates and clarifications. It addresses the use of magnetic field coupling as a test method and extends the frequency range from 10 kHz to 400 kHz. The amendment also includes guidance on test setup and measurement procedures, ensuring accurate and repeatable testing.

Key Requirements of IEC 61000-4-21:2016-AMD1:2018

To comply with IEC 61000-4-21:2016-AMD1:2018, manufacturers and developers need to meet specific requirements during the testing process. These requirements include:

1. Test Setup: The standard specifies the necessary equipment and test conditions, ensuring consistency across different testing environments. It provides guidelines for setting up the test circuit, including the generator, coupling network, and load.

2. Measurement Procedure: IEC 61000-4-21:2016-AMD1:2018 outlines the measurement procedure for assessing the immunity of equipment. It specifies measurement parameters, such as peak voltage, rise time, and pulse repetition rate, along with the required test levels.

3. Test Reporting: After conducting the tests, manufacturers must document their findings in a test report. This report should include details about the equipment tested, the test setup, measurement results, and any observed issues or anomalies. This information is crucial for evaluating the compliance of the equipment with the standard.


IEC 61000-4-21:2016-AMD1:2018 plays a significant role in ensuring the electromagnetic compatibility of electronic equipment. By establishing guidelines for electrical fast transients testing, this standard helps manufacturers and developers assess the immunity of their equipment against transient disturbances. Compliance with this standard enables the production of safer and more reliable electronic devices. As technology continues to advance, adherence to EMC standards like IEC 61000-4-21:2016-AMD1:2018 becomes increasingly critical to meet the demands of an interconnected world.

Note: This article provides general information about IEC 61000-4-21:2016-AMD1:2018 and should not be considered as a substitute for the official document. For detailed requirements and guidelines, please refer to the original standard published by the International Electrotechnical Commission.



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