EN IEC 60404-7:2020

SLOVENSKI STANDARD
01-julij-2020
Magnetni materiali - 7. del: Metode za merjenje koercitivnosti (do 160 kA/m)
magnetnih materialov v odprtem magnetnem krogu (IEC 60404-7:2019)
Magnetic materials - Part 7: Method of measurement of the coercivity (up to 160 kA/m) of
magnetic materials in an open magnetic circuit (IEC 60404-7:2019)
Magnetische Materialien - Teil 7: Verfahren zur Messung der Koerzitivfeldstärke (bis160
kA/m) von magnetischen Werkstoffen in einem offenen Magnetkreis (IEC 60404-7:2019)
Matériaux magnétiques - Partie 7: Méthode de mesure de la coercitivité (jusqu'à 160
kA/m) des matériaux magnétiques en circuit magnétique ouvert (IEC 60404-7:2019)
Ta slovenski standard je istoveten z: EN IEC 60404-7:2020
ICS:
17.220.20 Merjenje električnih in Measurement of electrical
magnetnih veličin and magnetic quantities
29.030 Magnetni materiali Magnetic materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 60404-7

NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2020
ICS 29.030; 17.220.20 Supersedes EN 10330:2015 and all of its amendments
and corrigenda (if any)
English Version
Magnetic materials - Part 7: Method of measurement of the
coercivity (up to 160 kA/m) of magnetic materials in an open
magnetic circuit
(IEC 60404-7:2019)
Matériaux magnétiques - Partie 7: Méthode de mesure de Magnetische Materialien - Teil 7: Verfahren zur Messung
la coercitivité (jusqu'à 160 kA/m) des matériaux der Koerzitivfeldstärke (bis160 kA/m) von magnetischen
magnétiques en circuit magnétique ouvert Werkstoffen in einem offenen Magnetkreis
(IEC 60404-7:2019) (IEC 60404-7:2019)
This European Standard was approved by CENELEC on 2019-02-20. 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 CEN-CENELEC
Management Centre 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 CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60404-7:2020 E

European foreword
The text of document 68/596/CDV, future edition 2 of IEC 60404-7, prepared by IEC/TC 68 "Magnetic
alloys and steels" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2020-10-24
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2023-04-24
document have to be withdrawn
This document supersedes EN 10330:2015 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice
The text of the International Standard IEC 60404-7:2019 was approved by CENELEC as a European
Standard without any modification.

IEC 60404-7 ®
Edition 2.0 2019-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Magnetic materials –
Part 7: Method of measurement of the coercivity (up to 160 kA/m) of magnetic

materials in an open magnetic circuit

Matériaux magnétiques –
Partie 7: Méthode de mesure de la coercitivité (jusqu'à 160 kA/m) des matériaux

magnétiques en circuit magnétique ouvert

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.030; 17.220.20 ISBN 978-2-8322-6385-3

– 2 – IEC 60404-7:2019 © IEC 2019
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Principle of the method . 7
5 Test specimen . 8
6 Solenoid . 8
7 Compensation for the earth’s magnetic field and static and dynamic magnetic
noise fields . 8
8 Magnetic shielding of the measurement region . 8
9 Measurement . 8
9.1 Magnetization . 8
9.2 Measuring methods . 9
9.2.1 General . 9
9.2.2 Method A . 9
9.2.3 Method B . 10
9.3 Determination of coercivity . 11
9.4 Reproducibility . 12
10 Test report . 13
Annex A (normative)  Precautions to be taken for measurements of coercivity below
40 A/m, with a complex shaped test specimen and some special cases . 14
A.1 Coercivity below 40 A/m . 14
A.2 Coercivity measurement of test specimens with complex shapes . 14
A.3 Optimization of the amplitude and time of the magnetizing cycle for a test
specimen of soft magnetic material . 14
A.4 Mechanical stress and heating of the test specimen in the solenoid . 14
Annex B (informative) Method C with a VSM (Vibrating Sample Magnetometer) . 15
Bibliography . 17

Figure 1 – Demagnetizing B(H) and J(H) curves from saturation . 6
Figure 2 – Circuit diagram for Methods A and B . 7
Figure 3 – Method A, magnetic flux sensing probe: Hall probe . 9
Figure 4 – Method A, magnetic flux sensing probe: differential fluxgate probe . 10
Figure 5 – Method B, magnetic flux sensing probe: differential fluxgate probe . 11
Figure 6 – Magnetic polarisation J over the length L of a cylindrical rod . 12
Figure B.1 – Schematic diagram of Method C with a VSM . 15

IEC 60404-7:2019 © IEC 2019 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MAGNETIC MATERIALS –
Part 7: Method of measurement of the coercivity (up to 160 kA/m) of
magnetic materials in an open magnetic circuit

FOREWORD
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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) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60404-9 has been prepared by IEC technical committee 68:
Magnetic alloys and steels.
This second edition cancels and replaces the first published in 1982. This edition constitutes
a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) Clause 1: The scope includes a more detailed description of the magnetic materials which
applies to this standard;
b) Clause 4: Figure 2 – circuit diagram for methods A and B was simplified and the fluxgate
probes inside the solenoid have been added;
c) Clause 7: Compensation for the earth’s magnetic field and for static and dynamic
magnetic noise fields has been added;

– 4 – IEC 60404-7:2019 © IEC 2019
d) Clause 8: Magnetic shielding of the measuring region has been added;
e) 9.2.2: The measuring methods for local and integral measurement of the flux in the test
specimen have been separated and the limitations in size and shape of the test specimen
have been considered.
f) 9:3: The method C with a VSM (Vibrating Sample Magnetometer) has been moved from
9.3 to the Annex B.
g) The term "complex shaped test specimen" has been replaced in several clauses by "test
specimen different from ellipsoids".
h) The character of Annex A has been changed from “informative” to “normative”.
The text of this International Standard is based on the following documents:
CDV Report on voting
68/596/CDV 68/608A/RVC
Full informati
...