EN 61000-4-7:2002

SLOVENSKI SIST EN 61000-4-7:2003

STANDARD
december 2003
Electromagnetic compatibility (EMC) - Part 4-7: Testing and measurement
techniques - General guide on harmonics and interharmonics measurements and
instrumentation, for power supply systems and equipment connected thereto (IEC
61000-4-7:2002)
ICS 33.100.20 Referenčna številka
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

EUROPEAN STANDARD EN 61000-4-7
NORME EUROPÉENNE
EUROPÄISCHE NORM October 2002

ICS 33.100.10; 33.100.20 Supersedes EN 61000-4-7:1993

English version
Electromagnetic compatibility (EMC)
Part 4-7: Testing and measurement techniques -
General guide on harmonics and interharmonics
measurements and instrumentation,
for power supply systems and equipment connected thereto
(IEC 61000-4-7:2002)
Compatibilité électromagnétique (CEM) Elektromagnetische Verträglichkeit (EMV)
Partie 4-7: Techniques d'essai Teil 4-7: Prüf- und Messverfahren -
et de mesure - Allgemeiner Leitfaden für Verfahren
Guide général relatif aux mesures und Geräte zur Messung
d'harmoniques et d'interharmoniques, von Oberschwingungen und
ainsi qu'à l'appareillage de mesure, Zwischenharmonischen in
applicable aux réseaux d'alimentation Stromversorgungsnetzen und
et aux appareils qui y sont raccordés angeschlossenen Geräten
(CEI 61000-4-7:2002) (IEC 61000-4-7:2002)

This European Standard was approved by CENELEC on 2002-10-01. CENELEC members are bound to
comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and
notified to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic,
Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta,
Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2002 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 61000-4-7:2002 E
Foreword
The text of document 77A/382/FDIS, future edition 2 of IEC 61000-4-7, prepared by SC 77A, Low
frequency phenomena, of IEC TC 77, Electromagnetic compatibility, was submitted to the
IEC-CENELEC parallel vote and was approved by CENELEC as EN 61000-4-7 on 2002-10-01.
This European Standard supersedes EN 61000-4-7:1993.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2003-07-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2005-10-01
Annexes designated "normative" are part of the body of the standard.
Annexes designated "informative" are given for information only.
In this standard, annex ZA is normative and annexes A, B and C are informative.
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61000-4-7:2002 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards
indicated:
IEC 61000-3 (Series) NOTE Partly harmonized in EN 61000-3 series (not modified).
IEC 61010-1 NOTE Harmonized as EN 61010-1:2001 (not modified).
__________
- 3 - EN 61000-4-7:2002
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of any
of these publications apply to this European Standard only when incorporated in it by amendment or
revision. For undated references the latest edition of the publication referred to applies (including
amendments).
NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
Publication Year Title EN/HD Year
1)
IEC 60050-161 - International Electrotechnical - -
Vocabulary (IEV)
Chapter 161: Electromagnetic
compatibility
1) 2)
IEC 61000-3-2 - Electromagnetic compatibility (EMC) EN 61000-3-2 2000
Part 3-2: Limits - Limits for harmonic
current emissions (equipment input
current up to and including 16 A per
phase)
1) 2)
IEC 61967-1 - Integrated circuits - Measurement of EN 61967-1 2002
electromagnetic emissions, 150 kHz to
1 GHz
Part 1: General conditions and
definitions
1)
Undated reference.
2)
Valid edition at date of issue.

INTERNATIONAL IEC
STANDARD 61000-4-7
Second edition
2002-08
BASIC EMC PUBLICATION
Electromagnetic compatibility (EMC) –
Part 4-7:
Testing and measurement techniques –
General guide on harmonics and interharmonics
measurements and instrumentation, for power
supply systems and equipment connected thereto
” IEC 2002 Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical,
including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale W
International Electrotechnical Commission
ɆɟɠɞɭɧɚɪɨɞɧɚɹɗɥɟɤɬɪɨɬɟɯɧɢɱɟɫɤɚɹɄɨɦɢɫɫɢɹ
For price, see current catalogue

61000-4-7 © IEC:2002 – 3 –
CONTENTS
FOREWORD . 7
INTRODUCTION .11
1 Scope .13
2 Normative references.13
3 Definitions, symbols and indices .15
3.1 Definitions related to frequency analysis.15
3.2 Definitions related to harmonics.17
3.3 Definitions related to distortion factors.19
3.4 Definitions related to interharmonics.21
3.5 Notations .23
3.5.1 Symbols and abbreviations .23
3.5.2 Indices.25
4 General concepts and common requirements for all types of instrumentation.25
4.1 Characteristics of the signal to be measured .25
4.2 Accuracy classes of instrumentation .25
4.3 Types of measurement .25
4.4 General structure of the instrument.27
4.4.1 Main instrument .27
4.4.2 Post-processing parts .29
5 Harmonic measurements .31
5.1 Current input circuit .31
5.2 Voltage input circuit .31
5.3 Accuracy requirements .33
5.4 Measurement set-up for emission assessment.35
5.5 Assessment of harmonic emissions .37
5.5.1 Grouping and smoothing .39
5.5.2 Compliance with emission limits.41
5.6 Assessment of voltage harmonic subgroups .41
6 Other analysis principles.41
7 Transitional period .43
8 General .43
Annex A (informative) Measurement of interharmonics.45
Annex B (informative) Measurements above the harmonic frequency range up to 9 kHz.49
Annex C (informative) Technical considerations for grouping method .53
Bibliography.71
Figure 1 – General structure of the measuring instrument .29
Figure 2 – Measurement set-up for single-phase emission measurement .35
Figure 3 – Measurement set-up for three-phase emission measurements.35

61000-4-7 © IEC:2002 – 5 –
Figure 4 – Illustration of harmonic and interharmonic groups (shown here for a 50 Hz
supply) .39
-1
Figure 5 – Realisation of a digital low-pass filter: z designates a time window delay,
α and β are the filter coefficients (see table 2 for values) .39
Figure 6 – Illustration of a harmonic subgroup and an interharmonic centred subgroup
(of a 50 Hz supply).41
Figure B.1 – Illustration of frequency bands for measurement, in the range 2 kHz to
9 kHz .51
Figure C.1 – Large 5th harmonic current fluctuation .59
Figure C.2 – Large 5th harmonic voltage fluctuation.59
Figure C.3 – Fluctuating 3rd harmonic current of a micro-wave appliance .61
Figure C.4 – Communication signal of 178 Hz together with 3rd and 5th harmonics .63
Figure C.5 – Interharmonic at 287 Hz, 5th and 6th harmonic .63
Figure C.6 – Modulated 5th harmonic and interharmonic at 287 Hz .67
Figure C.7 – Component vectors at frequencies of 245 Hz and 255Hz.69
Table 1 – Accuracy requirements for current, voltage and power measurements .33
Table 2 – Smoothing filter coefficients according to the window width .43

61000-4-7 © IEC:2002 – 7 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTROMAGNETIC COMPATIBILITY (EMC) –
Part 4-7: Testing and measurement techniques –
General guide on harmonics and interharmonics measurements and
instrumentation, for power supply systems and
equipment connected thereto
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization
comprising all national electrotechnical committees (IEC National Committees). The object of the IEC is to
promote international co-operation on all questions concerning standardization in the electrical and electronic
fields. To this end and in addition to other activities, the IEC publishes International Standards. Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt
with may participate in this preparatory work. International, governmental and non-governmental
organizations liaising with the IEC also participate in this preparation. The IEC collaborates closely with the
International Organization for Standardization (ISO) in accordance with conditions determined by agreement
between the two organizations.
2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an
international consensus of opinion on the relevant subjects since each technical committee has
representation from all interested National Committees.
3) The documents produced have the form of recommendations for international use and are published in the
form of standards, technical specifications, technical reports or guides and they
...