IEC TR 61000-1-9:2024

IEC TR 61000-1-9 ®
Edition 1.0 2024-03
TECHNICAL
REPORT
Electromagnetic compatibility (EMC) –
Part 1-9: General – Evaluation of uncertainty for the measurement of harmonic
current emissions
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IEC TR 61000-1-9 ®
Edition 1.0 2024-03
TECHNICAL
REPORT
Electromagnetic compatibility (EMC) –

Part 1-9: General – Evaluation of uncertainty for the measurement of harmonic

current emissions
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.100.10; 33.100.01 ISBN 978-2-8322-8282-3

– 2 – IEC TR 61000-1-9:2024 © IEC 2024
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Uncertainty evaluation for harmonic emissions tests in IEC 61000-3-2 and
IEC 61000-3-12 . 7
4.1 Methodology . 7
4.2 Measurement model. 8
4.3 Uncertainty components for worst-case scenario . 9
4.3.1 Method . 9
4.3.2 Current measurement equipment . 9
4.3.3 Input impedance of the current measurement equipment . 9
4.3.4 Test voltage RMS value . 10
4.3.5 Harmonic distortion of the test voltage . 10
4.3.6 Loading effect of the voltmeter. 11
4.4 Uncertainty budget for Class A harmonic 5 . 11
5 Uncertainty budget for typical measurement data . 12
5.1 General . 12
5.2 Current measurement equipment . 12
5.3 Input impedance of the measurement equipment . 13
5.4 Test voltage RMS value . 13
5.5 Harmonic distortion of the test voltage . 14
5.6 Loading effect of the voltmeter . 14
6 Measurement uncertainty supporting conformity decisions . 15
Annex A (informative) Worst-case uncertainty budgets for various EUT classes of
tests and selected harmonics . 16
Bibliography . 23

Figure 1 – Measurement circuit for single-phase equipment . 8

Table 1 – Worst-case uncertainty budget for Class A, Harmonic 5 . 11
Table A.1 – Worst-case uncertainty budget for Class A, Harmonic 5 . 16
Table A.2 – Worst-case uncertainty budget for Class A, Harmonic 6 . 17
Table A.3 – Worst-case uncertainty budget for Class A, Harmonic15 . 17
Table A.4 – Worst-case uncertainty budget for Class A, Harmonic 40 . 18
Table A.5 – Worst-case uncertainty budget for Class C, Harmonic 3 . 18
Table A.6 – Worst-case uncertainty budget for Class C, Harmonic 5 . 19
Table A.7 – Worst-case uncertainty budget for Class C, Harmonic 11 . 20
Table A.8 – Worst-case uncertainty budget for Class D, Harmonic 3 . 21
Table A.9 – Worst-case uncertainty budget for Class D, Harmonic 11 . 22

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTROMAGNETIC COMPATIBILITY (EMC) –

Part 1-9: General – Evaluation of uncertainty for
the measurement of harmonic current emissions

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
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6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
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the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC TR 61000-1-9 has been prepared by subcommittee 77A: EMC - Low frequency phenomena,
of IEC technical committee 77: Electromagnetic compatibility. It is a Technical Report.
The text of this Technical Report is based on the following documents:
Draft Report on voting
77A/1194/DTR 77A/1204/RVDTR
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this Technical Report is English.

– 4 – IEC TR 61000-1-9:2024 © IEC 2024
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
A list of all parts in the IEC 61000 series, published under the general title Electromagnetic
compatibility (EMC), can be found on the IEC website.
This document contains attached files in the form of a spreadsheet. These files are intended to
be used as a complement and do not form an integral part of the document.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
INTRODUCTION
IEC 61000 is published in separate parts, according to the following structure:
Part 1: General
General considerations (introduction, fundamental principles)
Definitions, terminology
Part 2: Environment
Description levels
Classification of the environment
Compatibility levels
Part 3: Limits
Emission limits
Immunity limits (in so far as they do not fall under the responsibility of the product
committees)
Part 4: Testing and measurement techniques
Measurement techniques
Testing techniques
Part 5: Installation and mitigation guidelines
Installation guidelines
Mitigation methods and devices
Part 6: Generic standards
Part 9: Miscellaneous
Each part is further subdivided into several parts, published either as international standards
or as technical specifications or technical reports, some of which have already been published
as sections. Others will be published with the part number followed by a dash and a second
number identifying the subdivision (example: IEC 61000-6-1).
The purpose of this document is to help testing laboratories that operate in accordance with
ISO/IEC 17025 to evaluate measurement uncertainty of harmonic current emission tests for
IEC 61000-3-2 and IEC 61000-3-12.
The document contains practical formulae that enable uncertainty calculations in accordance
with ISO/IEC Guide 98-3 (GUM).
The tables in this document provide examples relating to a worst-case scenario when the
measurement equipment introd
...