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ASTM A712-97(2002)

(Test Method)

Standard Test Method for Electrical Resistivity of Soft Magnetic Alloys

Standard Test Method for Electrical Resistivity of Soft Magnetic Alloys

SCOPE
1.1 This test method covers the measurement of electrical resistivity of strip or bar specimens of soft magnetic alloys.
1.2 The values are stated only in SI units and are to be regarded as 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.

General Information

Status
Historical
Publication Date
09-Oct-1997
ICS
29.030 - Magnetic materials
Technical Committee
A06 - Magnetic Properties
Drafting Committee
A06.01 - Test Methods
Current Stage
Ref Project

Relations

Replaces
ASTM A712-97 - Standard Test Method for Electrical Resistivity of Soft Magnetic Alloys
Effective Date
10-Oct-1997
Replaced By
ASTM A712-07 - Standard Test Method for Electrical Resistivity of Soft Magnetic Alloys
Effective Date
01-Dec-2007
Referred By
ASTM A901-19 - Standard Specification for Amorphous Magnetic Core Alloys, Semi-Processed Types
Effective Date
10-Oct-1997
Referred By
ASTM A345-19 - Standard Specification for Flat-Rolled Electrical Steels for Magnetic Applications
Effective Date
10-Oct-1997

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ASTM A712-97(2002) - Standard Test Method for Electrical Resistivity of Soft Magnetic AlloysASTM A712-97(2002) - Standard Test Method for Electrical Resistivity of Soft Magnetic Alloys
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ASTM A712-97(2002) - Standard Test Method for Electrical Resistivity of Soft Magnetic Alloys
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:A 712–97 (Reapproved 2002)
Standard Test Method for
Electrical Resistivity of Soft Magnetic Alloys
This standard is issued under the fixed designation A 712; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 6. Test Specimen
1.1 This test method covers the measurement of electrical 6.1 The test specimen shall be a straight strip or bar or wire
resistivity of strip or bar specimens of soft magnetic alloys. of substantially uniform cross-sectional area.
1.2 The values are stated only in SI units and are to be 6.2 It shall have a minimum length of 0.25 m. Strip
regarded as standard. specimens preferably should have a uniform width of 0.03 m
1.3 This standard does not purport to address all of the minimum, unless not available.
safety concerns, if any, associated with its use. It is the 6.2.1 If width of the strip material to be sampled prevents
responsibility of the user of this standard to establish appro- obtaining a sample of 0.03-m minimum width, the specimen
priate safety and health practices and determine the applica- width to be used shall be the maximum obtainable and shall be
bility of regulatory limitations prior to use. agreed upon between the manufacturer and the purchaser.
6.2.2 Bars and wires having circular, rectangular, or other
2. Referenced Documents
sections shall be used in the sectional dimensions as produced,
2.1 ASTM Standards:
unless they are so large as to require cutting a representative
A34/A34M Practice for Sampling and Procurement Test- sample of suitable dimensions.
ing of Magnetic Materials
6.3 It shall be free of obvious surface defects.
6.4 The surface shall be cleaned by wiping with a cloth. Oil
3. Summary of Test Method
and grease, if present on the surface, shall be removed with a
3.1 The electrical resistance of a 0.25-m long (minimum)
suitable solvent. Normal surface oxide or core plating need not
test specimen is measured with a Kelvin-type resistance bridge
be removed except in areas in which it is necessary to make
or a digital multimeter or the potentiometer-ammeter method.
satisfactory electrical contact.
The resistivity is then calculated from the resistance measure-
7. Procedure
ment and the dimensions of the specimen and is known as the
electrical resistivity of the material. This value is equal to the
7.1 Measure the electrical resistance of the test specimen
resistancebetweenoppositefacesofacubeofunitdimensions. usingaKelvin-typeresistancebridgeoradigitalmultimeteror
potentiometer-ammeter system having separate current and
4. Apparatus
potential leads.
4.1 Kelvin-type resistance bridge or a digital multimeter or
7.2 Thedistancebetweeneachpotentialleadcontactandthe
a dc potentiometer and dc ammeter providing resistance
corresponding current lead contact shall be at least twice the
measurementstoanaccuracywithin0.5%oftheacceptedtrue
widthofthetestspecimenwiththetwopotentialcontactslying
value.
between the current contacts. The distance between the poten-
tial contacts shall be not less than 0.12 m.
5. Sampling
7.3 The dimension of each potential contact in the direction
5.1 Samples shall be representative of the material in the
of the length of the specimen shall be not more than 0.5 % of
physical condition as shipped or agreed upon by the manufac-
the distance between potential contacts.
turer and the purchaser.
7.4 The contacts to the specimen shall be located centrally
with respect to the specimen’s width dimension, and the
current contacts shall cover more than 80 % of the width. A
This test method is under the jurisdiction of ASTM Committee A06 on
reliable contact shall be made with the specimen by both the
MagneticPropertiesandisthedirectresponsibilityofSubcommitteeA06.01onTest
current and potential leads.
Methods.
Current edition approved Oct. 10, 2002. Published December 1998. Originally
7.5 Specimentemperatureduringtestshouldbeabout25°C.
published as A712-75. Last previous edition A712-75.
Annual Book of ASTM Standards, Vol 03.04.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
A 712–97 (2002)
7.6 To eliminate errors as a result of contact potential, take 8.3 Calculate resistivity from the measured value of electri-
two readings, one direct and one with the current reversed, in cal resistance and the cross-sectional area as follows:
close succession.
r5 RA/l (2)
7.7 The electrical current in the test specimen must be
where:
limited to avoid overheating but must be adequate to provide
r = electrical resistivity of the material, V·m;
sufficient sensitivity to show an out-of-balance condition when
R = resistance of electrical path, V;
the resistance reading is changed 0.5 % of the value recorded.
A = cross-sectional area of electrical path, m ; and
If the current is too low, sensitivity is low also, and a balance
l = length of electrical path between potential contacts on
can be shown for a broad range of resistance.
the test specimen, m.
8.4 The resistivity units in ohm-metres shown in Eq 2 can
8. Calculation
be converted to microhm-centimetres by multiplying the ohm-
8.1 Strip Specimens:
metre figure by 10 microhm-centimetres per ohm-metre. For
−6
8.1.1 Determine the average cross-sectional area of the test
example, if the resistivity is 0.25 3 10 V ·m;
−6 8
specimen from the weight, length, and density as follows:
0.25 310 310 µV · cm/V · m is equal to 25
...

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FIG. 1 Basic Circuit Using Permeameter  
Note 1:  
A1—Multirange ammeter (main current)
A2—Multirange ammeter (hysteresis current)
B—Magnetic flux density test position for Switch S3
F—Electronic Fluxmeter
H—Magnetic field strength test position for Switch S3
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1.1 This practice covers sampling procedures and test practices for determination of various magnetic properties of both soft and hard magnetic materials.  
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1.5 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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