IEC 60404-13-2018 pdf free download
IEC 60404-13-2018 pdf free download.Magnetic materials – Part 13: Methods of measurement of resistivity, density and stacking factor of electrical steel strip and sheet.
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
I EC 60050-121, International Electrotechnical Vocabulary — Part 121: Electromagnetism
lEG 60050-221, International Electrotechnical Vocabulary — Chapter 221: Magnetic materials and components
lEG 60404-2, Magnetic materials — Part 2: Methods of measurement of the magnetic properties of electrical steel sheet and strip by means of an Epstein frame
lEG 60404-3, Magnetic materials — Part 3: Methods of measurement of the magnetic properties of magnetic sheet and strip by means of a single sheet tester
ISO 1183-3, Plastics — Methods for determining the density of non-cellular plastics — Part 3:
Gas pyknometer method
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-121, IEC 60050-221 and ISO 1183-3 apply.
ISO and lEG maintain terminological databases for use in standardization at the following addresses:
• lEG Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http:Jlwww.iso.org/obp
4 Determination of the resistivity
4.1 General
Two methods for the determination of the resistivity of a test specimen are described in this document; Method Ri using an Epstein strip specimen, and Method R2 using a rectangular sheet specimen.
NOTE Method R2 is based on the van-der-Pauw (VDP) method (1)1 which is based on the theory of conformal mapping of two-dimensional fields. For a body of uniform thickness and arbitrary shape, an exact mathematical formula exists for the resistivily determined from the voltage to current ratio obtained using four contacts, The formula is simplified when specimens and contact positions are highly symmetrical. Method R2 is particularly appropriate for rectangular sheet specimens.
The method of determination of the resistivity p, based on the measurement of the geometric dimensions of the test specimen including the thickness, can be applied to all types of material specimens. However, the method for further use to determine the density Pm in accordance with 5.21$ restricted to the materials as specified in 5.1.
4.2 PrInciples of measurement
4.2.1 Method of determining p for an Epstein strip specimen (Method Ri)
The circuit for the measurement of the resistance of an Epstein strip specimen shall be connected as shown in Figure 1. Two electrical contacts A and B shall be arranged on either end of the shorter sides of the test specimen to supply a homogeneous current through the test specimen in the longitudinal direction. Two electrical contacts, C and D, located inside the contacts A and B shall be arranged on a longer side ed9e of the test specimen to measure the voltage over the length ‘e’ It is not necessary to remove the oxide layer or other insulating coatings because the contacts are made at the cut edges of the specimen.IEC 60404-13 pdf download.
