ASTM E1629-12
(Practice)Standard Practice for Determining the Impedance of Absolute Eddy-Current Probes
Standard Practice for Determining the Impedance of Absolute Eddy-Current Probes
SIGNIFICANCE AND USE
4.1 Eddy-current probes may be used for the nondestructive examination of parts or structures made of electrically conducting materials. Many of these examinations are intended to discover material defects, such as cracks, that may cause the part or structure to be unsafe or unfit for service. Eddy-current probes that fail to meet the performance level requirements of this practice shall not be used for the examination of material or hardware unless the probe is qualified by some other system or an agreement has been reached by the probe manufacturer and the purchaser, or both.
SCOPE
1.1 This practice covers a procedure for determining the impedance of absolute eddy-current probes (bridge-type, air or ferrite core, wire wound, shielded, or unshielded) used for finding material defects in electrically conducting material. This practice is intended to establish a uniform methodology to measure the impedance of eddy-current probes prior to receipt of these probes by the purchaser or the specifier.
1.2 Limitations—This practice does not address the characterization or measurement of the impedance of differential, a-c coupled, or transmit/receive types of probes. This practice does not address the use of magnetic materials in examination probes. This practice shall not be used as a basis for selection of the best probe for a particular application or as a means by which to calibrate or standardize a probe for a specific examination. This practice does not address differences in the impedance values that can be obtained when the probe and material are in relative motion, as in a rotating probe, since the procedure described here requires the probe and material to be stationary.
1.3 Units—The values stated in SI units are to be regarded as the standard. The values given in parentheses are mathematical conversions to inch-pound units that are provided for information only and are not considered standard.
1.4 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: E1629 − 12
Standard Practice for
Determining the Impedance of Absolute Eddy-Current
1
Probes
This standard is issued under the fixed designation E1629; 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 (´) indicates an editorial change since the last revision or reapproval.
2
1. Scope* E1316Terminology for Nondestructive Examinations
1.1 This practice covers a procedure for determining the
3. Terminology
impedance of absolute eddy-current probes (bridge-type, air or
3.1 Definitions—Definitionsoftermsrelatingtoelectromag-
ferrite core, wire wound, shielded, or unshielded) used for
netic examination are given in Terminology E1316.
finding material defects in electrically conducting material.
Thispracticeisintendedtoestablishauniformmethodologyto
3.2 Definitions of Terms Specific to This Standard:
measure the impedance of eddy-current probes prior to receipt 3.2.1 eddy-current reference standard— for the purposes of
of these probes by the purchaser or the specifier.
the method described in this practice,arectangularblockmade
of an aluminum alloy (see 6.1.2) to which an active eddy-
1.2 Limitations—This practice does not address the charac-
current probe is applied. The eddy-current reference standard
terization or measurement of the impedance of differential, a-c
can also be referred to as an eddy-current test block.
coupled,ortransmit/receivetypesofprobes.Thispracticedoes
not address the use of magnetic materials in examination
3.3 Mathematical Symbols:
probes. This practice shall not be used as a basis for selection 3.3.1 j—asymbolusedinelectricalengineeringtorepresent
of the best probe for a particular application or as a means by
=21 . It is associated with the restriction to the flow of
which to calibrate or standardize a probe for a specific
electrical current caused by capacitors and coils.
examination. This practice does not address differences in the
3.3.2 N— any number.
impedance values that can be obtained when the probe and
3.3.3 | –N|—the magnitude of N, regardless whether N is
material are in relative motion, as in a rotating probe, since the
positive, negative, or a vector quantity.
procedure described here requires the probe and material to be
3.3.4 =N— the square root of N.
stationary.
2
3.3.5 (–N) —N squared, that is, N× N.
1.3 Units—The values stated in SI units are to be regarded
3.3.6 ∆N— delta N, the change or difference in N.
asthestandard.Thevaluesgiveninparenthesesaremathemati-
3.4 Abbreviations:
cal conversions to inch-pound units that are provided for
−1
3.4.1 tan—used for the tangent function. The tan , arc
information only and are not considered standard.
tangent or inverse tangent function, returns a value that is a
1.4 This standard does not purport to address all of the
measure of an angle and can be in either degrees or radians.
safety concerns, if any, associated with its use. It is the −1
When using a calculator to determine the tan , care should be
responsibility of the user of this standard to establish appro-
taken to determine whether the answer is in degrees or radians
priate safety and health practices and determine the applica-
since the numerical values that represent the same angle are
bility of regulatory limitations prior to use.
different.
3.4.2 cos—used for the cosine function.
2. Referenced Documents
3.4.3 sin—used for the sine function.
2.1 The following document forms a part of this practice to
the extent specified herein:
4. Significance and Use
2.2 ASTM Standards:
4.1 Eddy-currentprobesmaybeusedforthenondestructive
examinationofpartsorstructuresmadeofelectricallyconduct-
ing materials. Many of these examinations are intended to
1
This practice is under the jurisdiction of ASTM Committee E07 on Nonde-
structive Testing and is the direct responsibility of Subcommittee E07.07 on
2
Electromagnetic Method. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Nov. 1, 2012. Published November 2012. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1994. Last previous edition approved in 2007 as E1629-07. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/E1629-12. the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
E1629 − 12
discover material defects, such as cracks, that may cause the 6.1.1 Equipment—The instrument shall be either a commer-
part or structure to be unsafe or unfit for service. E
...
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: E1629 − 07 E1629 − 12
Standard Practice for
Determining the Impedance of Absolute Eddy-Current
1
Probes
This standard is issued under the fixed designation E1629; 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 Scope*
1.1 This practice covers a procedure for determining the impedance of absolute eddy-current probes (bridge-type, air or ferrite
core, wire wound, shielded, or unshielded) used for finding material defects in electrically conducting material. This practice is
intended to establish a uniform test methodology to measure the impedance of eddy-current probes prior to receipt of these probes
by the purchaser or the specifier.
1.2 Limitations—This practice does not address the characterization or measurement of the impedance of differential, a-c
coupled, or transmit/receive types of probes. This practice does not address the use of magnetic materials in testingexamination
probes. This practice shall not be used as a basis for selection of the best probe for a particular application or as a means by which
to calibrate or standardize a probe for a specific examination. This practice does not address differences in the impedance values
that can be obtained when the probe and material are in relative motion, as in a rotating probe, since the procedure described here
requires the probe and material to be stationary.
1.3 Units—The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information
only. mathematical conversions to inch-pound units that are provided for information only and are not considered standard.
1.4 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
2.1 The following document forms a part of this practice to the extent specified herein:
2.2 ASTM Standards:
2
E1316 Terminology for Nondestructive Examinations
3. Terminology
3.1 Definitions—The terminology relating to eddy-current examination that appears in Terminology E1316 shall apply to the
terms used in this practice.
3.1 Definitions—Definitions of terms relating to electromagnetic examination are given in Terminology E1316.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 eddy-current test block—reference standard— for the purposes of the method described in this practice, a rectangular
block made of an aluminum alloy (see 6.1.2) to which an active eddy-current probe is applied. The eddy-current reference standard
can also be referred to as an eddy-current test block.
3.3 Mathematical Symbols:
3.3.1 j—a symbol used in electrical engineering to represent =21 . It is associated with the restriction to the flow of electrical
current caused by capacitors and coils.
3.3.2 N— any number.
1
This practice is under the jurisdiction of ASTM Committee E07 on Nondestructive Testing and is the direct responsibility of Subcommittee E07.07 on Electromagnetic
Method.
Current edition approved July 1, 2007Nov. 1, 2012. Published July 2007November 2012. Originally approved in 1994. Last previous edition approved in 20012007 as
E1629 - 94E1629 - 07.(2001). DOI: 10.1520/E1629-07.10.1520/E1629-12.
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.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
E1629 − 12
3.3.3 | –N|—the magnitude of N, regardless whether N is positive, negative, or a vector quantity.
3.3.4 =N— the square root of N.
2
3.3.5 (–N) —N squared, that is, N × N.
3.3.6ΔN— delta N, the change or difference in N.
3.4 Abbreviations:
−1
3.4.1 tan—used for the tangent function. The tan , arc tangent or inverse tangent function, returns a value that is a measure
−1
of an angle and can be in either degrees or radians. When using a calculator to determine the tan , care
...
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