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Standard Test Method for Determining Electrical Conductivity Using the Electromagnetic (Eddy-Current) Method

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Standard Test Method for Determining Electrical Conductivity Using the Electromagnetic (Eddy Current) Method


1.1 This test method describes a procedure for measuring the electrical conductivity of nonmagnetic metals using the electromagnetic (eddy current) method. The procedure has been written primarily for use with commercially available electrical conductivity instruments. General purpose eddy-current instruments may also be used for electrical conductivity measurements but will not be addressed in this test method.

1.2 This test method is applicable to metals that have a flat or slightly curved surface, and metals that may have a thin nonconductive coating.

1.3 Eddy-current measurements of electrical conductivity may be used in the sorting of metals with respect to variables such as: type of alloy, aging, cold deformation, heat treatment, effects associated with nonuniform heating or overheating, and effects of corrosion. The usefulness of tests of these properties is dependent on the amount of electrical conductivity change caused by a change in the specific variable.

1.4 Electrical conductivity, when measured by eddy-current instruments, usually is expressed as a percentage of the conductivity of the International Annealed Copper Standard (IACS). The conductivity of the Annealed Copper Standard (100% IACS) is defined to be 0.58 X 108 S/m at 20°C.

1.5 This standard does not purport to address the safety problems, 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.


Absolute coil method; Aluminum alloys-electrical conductors; Aluminum electrical conductors; Austenitic steel-stainless steel; Bronze; Calibration-metals/alloys instrumentation; Coils; Communication cable; Copper-electromagnetic testing; Copper alloy wire-electrical conductors; Copper electrical conductors; Copper electrical conductors-copper-clad steel; Corrosion; Current measurement; Depth of penetration; Electromagnetic (eddy current) testing; Magnesium alloys; Metals and metallic materials-electrical; Nondestructive evaluation (NDE); Nonferrous metals/alloys; Railroad steel materials; Railroad steel materials-trolley wire; Silver-electrical/electronic applications; Silver-coated copper wire; Standard depth of penetration; Steel; Steel wire-core wire; Steel wire strand; Temperature tests; Thickness; Tin-coated copper wire-electrical conductors; Trolley wire; Zinc alloys; Zinc-coated steel core wire; electromagnetic (eddy current) measurement of electrical conductivity,; test,; Conductance and conductivity (electrical); Nonmagnetic metals; electromagnetic (eddy-current) measurements of electrical conductivity; (of nonmagnetic metals), test,; Probe methods; probe coils- electromagnetic (eddy current) measurement of electrical; conductivity, test; ICS Number Code 17.220.20 (Measurement of electrical and magnetic quantities)

To find similar documents by ASTM Volume:

03.03 (Nondestructive Testing)

To find similar documents by classification:

17.220.20 (Measurement of electrical and magnetic quantities Including measuring instruments, instrument transformers Electric energy meters in buildings, see 91.140.50)

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Document Number


Revision Level




Modification Type

Revision with Title Change

Publication Date

May 25, 1984

Document Type


Page Count

5 pages

Committee Number