ASTM A717/A717M-12
(Test Method)Standard Test Method for Surface Insulation Resistivity of Single-Strip Specimens
Standard Test Method for Surface Insulation Resistivity of Single-Strip Specimens
SIGNIFICANCE AND USE
5.1 This test method is particularly suitable for quality control in the application of insulating coatings.
5.2 Surface insulation resistivity is evaluated from a dc current that can range from 0 (perfect insulator) to 1 A (perfect conductor).
5.3 Single readings should not be considered significant since the nature of the test device and specimen are such that successive measurements of a specimen often yield different values.
SCOPE
1.1 This test method covers a means of testing the surface insulation resistivity of single strips or punchings of flat-rolled electrical steel under predetermined conditions of voltage, pressure, and temperature.
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: A717/A717M − 12
Standard Test Method for
1
Surface Insulation Resistivity of Single-Strip Specimens
This standard is issued under the fixed designationA717/A717M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.
A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 4. Summary of Test Method
4.1 Ten metallic contacts of fixed area are applied to one of
1.1 This test method covers a means of testing the surface
thesurfacesofthespecimenandelectricalcontactismadewith
insulation resistivity of single strips or punchings of flat-rolled
the base metal by two drills. The effectiveness of the surface
electrical steel under predetermined conditions of voltage,
insulation is then indicated by a measurement of average
pressure, and temperature.
electrical current flowing between the contacts and the base
1.2 The values stated in either SI units or inch-pound units
metal under specified applied voltage. This measurement can
are to be regarded separately as standard. The values stated in
be used directly as an indicator of insulation quality or may be
each system may not be exact equivalents; therefore, each
converted to an apparent surface insulation resistivity value.
system shall be used independently of the other. Combining
values from the two systems may result in non-conformance
5. Significance and Use
with the standard.
5.1 This test method is particularly suitable for quality
1.3 This standard does not purport to address all of the
control in the application of insulating coatings.
safety concerns, if any, associated with its use. It is the
5.2 Surface insulation resistivity is evaluated from a dc
responsibility of the user of this standard to establish appro-
current that can range from 0 (perfect insulator) to 1A(perfect
priate safety and health practices and determine the applica-
conductor).
bility of regulatory limitations prior to use.
5.3 Single readings should not be considered significant
since the nature of the test device and specimen are such that
2. Referenced Documents
successive measurements of a specimen often yield different
2
2.1 ASTM Standards:
values.
A34/A34M Practice for Sampling and Procurement Testing
of Magnetic Materials
6. Apparatus
6.1 The apparatus, as shown in Fig. 1 and Fig. 2, shall
3. Terminology
consist of a contact unit or test head which is attached to the
3.1 Definitions of Terms Specific to This Standard:
head of a hydraulic press. Its associated measuring equipment,
3.1.1 surface insulation resistivity—refers to the effective
which may be remotely located, includes an ammeter,
resistivity of a single insulative layer tested between applied
voltmeter, and voltage regulated dc power supply. When
bare metal contacts and the base metal of the insulated test
measurements are to be made at elevated temperatures, the
specimen.Itisnotthesameasthetermsinterlaminarresistivity
platen beneath the specimen is heated and controlled. Detailed
and stack resistivity, which refer to the average resistivity of
descriptions of the various components are given in AnnexA1.
two adjacent insulative surfaces in contact with each other.
7. Sampling
3.1.2 The apparatus is popularly known as a Franklin tester.
7.1 Samples shall be representative of the steel and shall be
cut in a manner to assure representative sampling as described
in Practice A34/A34M.
1
This test method is under the jurisdiction of ASTM Committee A06 on
MagneticPropertiesandisthedirectresponsibilityofSubcommitteeA06.01onTest
8. Test Specimen
Methods.
CurrenteditionapprovedMay1,2012.PublishedJuly2012.Originallyapproved
8.1 Thewidthandlengthofaspecimenstripshallbegreater
in 1975. Last previous edition approved in 2006 as A717/A717M –06. DOI:
than the width and length respectively of the assembly of
10.1520/A0717_A0717M-12.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contacts. The suggested minimum specimen size is 2 by 5 in.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
[50 by 130 mm].
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 8.2 A minimum of five specimen strips is recommended.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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A717/A717M − 12
FIG. 1 Apparatus of Surface Insulation Resistivity Measurement
9.6 When the insulation may be hygroscopic, a conditioning
procedure immediately prior to testing should be mutually
agreed upon by the producer and the user.
9.7 Place the specimen on the platen beneath the test head
and positio
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: A717/A717M − 06 A717/A717M − 12
Standard Test Method for
1
Surface Insulation Resistivity of Single-Strip Specimens
This standard is issued under the fixed designation A717/A717M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.
A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This test method covers a means of testing the surface insulation resistivity of single strips or punchings of flat-rolled
electrical steel under predetermined conditions of voltage, pressure, and temperature.
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each
system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the
two systems may result in non-conformance with the standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
A34/A34M Practice for Sampling and Procurement Testing of Magnetic Materials
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 surface insulation resistivity—refers to the effective resistivity of a single insulative layer tested between applied bare
metal contacts and the base metal of the insulated test specimen. It is not the same as the terms interlaminar resistivity and stack
resistivity, which refer to the average resistivity of two adjacent insulative surfaces in contact with each other.
3.1.2 The termapparatus surface insulation resistivity used in this method refers to the effective resistivity of a single insulative
layer tested between applied bare metal contacts and the base metal of the insulated test specimen. It is not the same as the terms
interlaminar resistivity and stack resistivity, which refer to the average resistivity of two adjacent insulative surfaces in contact with
each other.is popularly known as a Franklin tester.
3.2 The apparatus is popularly known as a Franklin tester.
4. Summary of Test Method
4.1 Ten metallic contacts of fixed area are applied to one of the surfaces of the specimen and electrical contact is made with
the base metal by two drills. The effectiveness of the surface insulation is then indicated by a measurement of average electrical
current flowing between the contacts and the base metal under specified applied voltage. This measurement can be used directly
as an indicator of insulation quality or may be converted to an apparent surface insulation resistivity value.
5. Significance and Use
5.1 This test method is particularly suitable for quality control in the application of insulating coatings.
5.2 Surface insulation resistivity is evaluated from a dc current that can range from 0 (perfect insulator) to 1 A (perfect
conductor).
5.3 Single readings should not be considered significant since the nature of the test device and specimen are such that successive
measurements of a specimen often yield different values.
1
This test method is under the jurisdiction of ASTM Committee A06 on Magnetic Properties and is the direct responsibility of Subcommittee A06.01 on Test Methods.
Current edition approved May 1, 2006May 1, 2012. Published May 2006July 2012. Originally approved in 1975. Last previous edition approved in 20012006 as
A717/A717M – 01.A717/A717M –06. DOI: 10.1520/A0717_A0717M-06.10.1520/A0717_A0717M-12.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
A717/A717M − 12
6. Apparatus
6.1 The apparatus, as shown in Fig. 1 and Fig. 2, shall consist of a contact unit or test head which is attached to the head of
a hydraulic press. Its associated measuring equipment, which may be remotely located, includes an ammeter, voltmeter, and
voltage regulated dc power supply. When measurements are to be made at eleva
...
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