IEC 60404-11:1991

IEC 60404-11 ®
Edition 1.2 2012-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Magnetic materials –
Part 11: Method of test for the determination of surface insulation resistance of
magnetic sheet and strip
Matériaux magnétiques –
Partie 11: Méthode d'essai pour la détermination de la résistance d'isolement
superficiel des tôles et feuillards magnétiques

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IEC 60404-11 ®
Edition 1.2 2012-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Magnetic materials –
Part 11: Method of test for the determination of surface insulation resistance of

magnetic sheet and strip
Matériaux magnétiques –
Partie 11: Méthode d'essai pour la détermination de la résistance d'isolement

superficiel des tôles et feuillards magnétiques

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX CD
ICS 17.220.01; 29.030 ISBN 978-2-88912-053-6

– 2 – 60404-11 © IEC:1991+A1:1998

+A2:2012
CONTENTS
FOREWORD . 3

1 Scope and field of application . 5

2 Principle of measurement . 5

3 Test specimen . 6

4 Apparatus . 6

4.1 Contact assembly . 6
4.2 Power supply . 7
4.3 Current measurement . 7
4.4 Determination of applied force . 8
5 Calibration . 9
6 Measuring procedure . 9
7 Evaluation of surface insulation resistance . 9
8 Test report . 10

Figure 1 – Arrangement of apparatus for the measurement of surface insulation resistance . 5
Figure 2 – Arrangement of stabilizing circuit: mode A . 8
Figure 3 – Arrangement of stabilizing circuit: mode B . 8

60404-11 © IEC:1991+A1:1998 – 3 –

+A2:2012
INTERNATIONAL ELECTROTECHNICAL COMMISSION

–––––––––––
MAGNETIC MATERIALS –
Part 11: Method of test for the determination

of surface insulation resistance of

magnetic sheet and strip
FOREWORD
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This International Standard has been prepared by IEC technical committee 68: Magnetic alloys
and steels.
This consolidated version of IEC 60404-11 consists of the first edition (1991) [documents
68(CO)69 and 68(CO)76], its amendment 1 (1998) [documents 68/181/FDIS and 68/186/RVD]
and its amendment 2 (2012) [documents 68/434/FDIS and 68/435/RVD].
The technical content is therefore identical to the base edition and its amendments and has
been prepared for user convenience.

– 4 – 60404-11 © IEC:1991+A1:1998

+A2:2012
It bears the edition number 1.2.

A vertical line in the margin shows where the base publication has been modified by

amendments 1 and 2.
60404-11 © IEC:1991+A1:1998 – 5 –

+A2:2012
MAGNETIC MATERIALS –
Part 11: Method of test for the determination

of surface insulation resistance of

magnetic sheet and strip
1 Scope and field of application
This International Standard is intended to define a measurement method for the determination
of the characteristics of surface insulation resistance of magnetic sheet and strip.
This method is applicable to magnetic sheet and strip insulated on one or both surfaces and is
suitable for manufacturing control in the application of insulation coatings.
2 Principle of measurement
The principle of the measurement is based on, and includes, the method originally described by
*
Franklin which characterizes only one coated surface at a time.
The arrangement of the apparatus is shown in figure 1. Ten metallic contacts of fixed area are
applied to one coated surface of the sheet, under specified conditions of voltage and pressure.
The effectiveness of the surface insulation is assessed by the measurement of the currents
through the 10 contacts.
Micro-
Power supply
processor
Display
Contact buttons
Twist drill
(a total of 10)
for contact
Insulation
coating
Test specimen
IEC  1 595/98
Figure 1 – Arrangement of apparatus for the measurement of
surface insulation resistance
–––––––––
*
Franklin, R.F., "Measurement and control of interlaminar resistance of laminated magnetic cores", ASTM
Bulletin, no. 144, January 1947, p. 57.

– 6 – 60404-11 © IEC:1991+A1:1998

+A2:2012
Each contact button is individually fed from a d.c. power supply in one of the two ways which

constitute the two modes of measurement used in this standard, namely:

a) Mode A The voltage between the supply side of the 5 Ω ± 1 % resistors (see figure 2) and

the drill contacts is stabilized at 500 mV ± 0,5 % over a current range of 0 to 1 A. The two

twist drills perform the function of current return contacts with the substrate.

b) Mode B The voltage between each contact button and the drill contacts is stabilized at

250 mV ± 0,5 % over a current range from 0 to 2,5 A for the analysis of individual electrode

currents. The two twist drills perform different functions. One drill provides the current

return contact with the substrate. The other drill serves as a potential sensor for the voltage

feedback control. This method removes the influence of the variable contact resistance
between the current return drill and the substrate.
The voltage across sub
...