Overview
IEC TR 61000-1-9:2024/AMD1:2026, Amendment 1 is a key technical report published by the International Electrotechnical Commission (IEC). This amendment updates procedures for evaluating measurement uncertainty in harmonic current emission tests, a critical aspect of electromagnetic compatibility (EMC) for electrical and electronic equipment. The standard focuses on refining how uncertainty is assessed in conformity testing against the harmonic limits established in IEC 61000-3-2 and IEC 61000-3-12, ensuring a globally recognized methodology for measurement and compliance.
This amendment introduces revised methodologies, references updated materials, and clarifies requirements for calculating uncertainties, especially for equipment with input current greater than 16 A and up to 75 A per phase.
Keywords: electromagnetic compatibility, EMC, harmonic current emissions, measurement uncertainty, IEC 61000, conformity assessment.
Key Topics
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Evaluation of Measurement Uncertainty
Provides guidance on quantifying the measurement uncertainty associated with harmonic emissions testing, in line with best practices in EMC.
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Scope and Applicability
Applies to a broad range of electrical equipment, particularly those falling within current ratings specified by IEC 61000-3-2 and -3-12.
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System Impedance Consideration
Specifies that for higher current equipment (above 16 A, up to 75 A per phase), the uncertainty contributed by system impedance replaces the input impedance of measuring equipment.
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Updated Normative References
Incorporates the latest editions and amendments of referenced documents, notably IEC 61000-3-12:2011/AMD1:2021 and IEC Guide 115:2023.
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Uncertainty Budgets and Calculation Methods
Annex B introduces comprehensive uncertainty budget tables for various harmonics and equipment configurations, illustrating worst-case scenarios and the influence of test equipment and grid parameters.
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Compliance and Conformity Principles
Clarifies how measurement results are assessed for conformity, aligning with the "simple acceptance" principle from IEC Guide 115 and JCGM 106.
Applications
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Test Laboratories and Certification Bodies
Enables accredited test facilities to consistently evaluate harmonic current emission measurements and establish reliable uncertainty budgets, supporting global product conformity.
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Equipment Manufacturers
Assists designers and manufacturers of electrical and electronic devices in understanding compliance requirements and making accurate declarations of EMC performance.
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Regulators and Market Surveillance
Offers regulatory authorities a harmonized approach to assess and verify manufacturers’ compliance with EMC and harmonic emission standards.
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Compliance Engineers
Equips engineers with refined methods to analyze measurement data, considering advanced uncertainty calculations for a wide array of equipment and installation environments.
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Technical Committees and Standard Developers
Provides a structured template for future enhancements and cross-references ISO/IEC international guidelines, facilitating continuous improvement in EMC standards.
Related Standards
- IEC 61000-3-2 - Limits for harmonic current emissions (equipment input current ≤ 16 A per phase)
- IEC 61000-3-12 - Limits for harmonic currents produced by equipment connected to public low-voltage systems with input current > 16 A and ≤ 75 A per phase
- IEC 61000-4-7 - General guide on harmonics and interharmonics measurements and instrumentation
- IEC Guide 115:2023 - Application of uncertainty of measurement to conformity assessment activities in the electrotechnical sector
- JCGM 106:2012 - Evaluation of measurement data - The role of measurement uncertainty in conformity assessment
Practical Value
IEC TR 61000-1-9:2024/AMD1:2026 ensures reliable, internationally aligned procedures for assessing the uncertainty in harmonic current emission measurements. This benefits industries, test labs, and regulators by:
- Enhancing measurement consistency and comparability worldwide
- Supporting transparent compliance assessments and market access
- Reducing technical barriers to trade in electrical and electronic equipment
This amendment is an essential resource in advancing the precision and credibility of EMC testing in today’s complex power environments.