MAGNETIC MATERIALS - PART 2: METHODS OF MEASUREMENT OF THE MAGNETIC PROPERTIES OF ELECTRICAL STEEL STRIP AND SHEET BY MEANS OF AN EPSTEIN FRAME
International Electrotechnical Committee
FOREWORD
1 Scope and object
2 Normative references
3 General principles of a.c. measurements
3.1 Principle of the 25 cm Epstein frame method
3.2 Test specimen
3.3 The 25 cm Epstein frame
3.4 Air flux compensation
3.5 Power supply
3.6 Voltage measurement
3.7 Frequency measurement
3.8 Power measurement
4 Procedure for the measurement of the specific total loss
4.1 Preparation for measurement
4.2 Adjustment of power supply
4.3 Measurement of power
4.4 Determination of the specific total loss
4.5 Reproducibility of the specific total loss measurement
5 Procedure for the determination of the peak value
of magnetic polarization, r.m.s. value of magnetic
field strength, peak value of magnetic field strength
and specific apparent power
5.1 Test specimen
5.2 Principle of measurement
5.3 Reproducibility
6 General principles of d.c. measurements
6.1 Principle of the 25 cm Epstein frame method
6.2 Test specimen
6.3 The 25 cm Epstein frame
6.4 Air flux compensation
6.5 Power supply
6.6 Apparatus accuracy
7 Procedure for the d.c. measurement of the magnetic
polarization
7.1 Preparation for measurement
7.2 Determination of the magnetic polarization
7.3 Determination of the magnetic hysteresis loop
7.4 Reproducibility of the measurement of the magnetic
polarization
8 Test report
Annex A (informative) Digital sampling methods for
the determination of the magnetic properties
Bibliography
Defines the general principles and the technical details of the measurement of the magnetic properties of electrical steel sheet and strip by means of an Epstein frame.
| Document Type | Standard |
| Status | Current |
| Publisher | International Electrotechnical Committee |
| Committee | TC 68 |
