ASTM E317-11 PDF

Full Description 1. Evaluation of these characteristics is intended to be used for comparing instruments and systems or, by periodic repetition, for detecting long-term changes in the characteristics of a given instrument or system that may be indicative of impending failure, and which, if beyond certain limits, will require corrective maintenance. Instrument characteristics measured in accordance with this practice are expressed in terms that relate to their potential usefulness for ultrasonic testing. Instrument characteristics expressed in purely electronic terms may be measured as described in E

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A number in parentheses indicates the year of last reapproval. This standard has been approved for use by agencies of the U. Department of Defense. Evaluation of these characteristics isintended to be used for comparing instruments and systems or,by periodic repetition, for detecting long-term changes in thecharacteristics of a given instrument or system that may beindicative of impending failure, and which, if beyond certainlimits, will require corrective maintenance.

Instrument charac-teristics measured in accordance with this practice are ex-pressed in terms that relate to their potential usefulness forultrasonic testing. Instrument characteristics expressed inpurely electronic terms may be measured as described inE This practiceis not intended to be used as a substitute for calibration orstandardization of an instrument or system to inspect any givenmaterial.

There are limitations to the use of standard referenceblocks for that purpose. The values given in parentheses aremathematical conversions to SI units that are provided forinformation only and are not considered standard. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use. Referenced Documents2. Current edition approved Aug. Published August Originallyapproved in Last previous edition approved in as E - 06a.

Summary of Practice4. Significance and Use5. More comprehensive or precisemeasurements of the characteristics of complete systems andtheir components will generally require laboratory techniquesand electronic equipment such as oscilloscopes and signalgenerators. Substitution of these methods is not precludedwhere appropriate; however, their usage is not within the scopeof this practice.

This is the prerogative of the usingparties and is dependent on application, environment, andstability of equipment. Certain sections arealso compatible with angle-beam, wheel, delay-line, and dual-search unit techniques. Their use, however, should be mutuallyagreed upon and so identified in the test report. This is assumed tobe Procedures for Obtaining Ultrasonic Response Data6.

For each procedure determine from the requestingdocuments the instrument examination range to be evaluated,select the appropriate search unit, fixtures, and test blocks, andestablish the required display conditions. It may be desirable to vary the instrumentcontrols from these initial values. If so, it is important toobserve and report any anomalous effects on the parametersbeing evaluated when the controls are so varied.

If it is used to affect any one orcombination of characteristics, measured under this document,then all characteristics shall be evaluated with the same level ofcompensation as was used on any one, and this level should bereferenced in the report.

If, for any reason, this is not feasible for thesystem under test, estimate the probable accuracy and includethis in the report. Readability can sometimes be improved bythe use of an external scale attached to the display screenhaving 50 or divisions for full scale.

Refer also toPractice E A specified minimum trace length is usually neces-sary to obtain the horizontal readability desired. Nonlinearityof sweep trace may affect accuracy of flaw depth or thicknessdetermination made directly from the display screen. Any block having good ultrasonic transmittivity,flat parallel faces, and a thickness of about one tenth of thespecified sweep range will usually be adequate.

The aluminumblocks shown in Table 1 will be satisfactory for mid-rangefrequencies and sweep settings on most instruments when thebeam is directed through the thickness T. For other testfrequencies or very large search units, different block dimen-sions or other block designs may be required to eliminateinterferences. The couplant system used, either contact orimmersed, must provide stable indications during the measure-ments. A horizontal scale permitting reading accuracy asspecified in 6.

NOTE 1—An encapsulated transducer-targets assembly may be used forthis purpose. Adjust the instrument gain, sweep-delay, and sweep-length controls to display eleven noninterfering back reflec-tions. NOTE 2—Either more or fewer reflections can be used by suitablymodifying the procedure. Measurement of the horizontalposition of each multiple echo, should be made at the same amplitude onthe leading edge of the indication.

Any specific value may be selected ifit is used consistently. Typically used values are baseline break, halfamplitude, or signal peak.

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ASTM E317:16

Gozshura Enter your personal account email address to request a password reset: Asym to Active This link will qstm route to the current Active version of the standard. This is the prerogative of the using parties and is dependent on application, environment, and stability of equipment. Copyright Compu-tecture, Inc. E Standard Terminology for Nondestructive Examinations. This practice describes procedures applicable to both shop and field conditions. Significance and Use This practice describes procedures applicable to both shop and field conditions. Substitution of these methods is not precluded where appropriate; however, their usage is not within the scope of this practice.

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ASTM E317:11

Evaluation of these characteristics is intended to be used for comparing instruments and systems or, by periodic repetition, for detecting long-term changes in the characteristics of a given instrument or system that may be indicative of impending failure, and which, if beyond certain limits, will require corrective maintenance. Instrument characteristics measured in accordance with this practice are expressed in terms that relate to their potential usefulness for ultrasonic testing. Instrument characteristics expressed in purely electronic terms may be measured as described in E This practice is not intended to be used as a substitute for calibration or standardization of an instrument or system to inspect any given material. There are limitations to the use of standard reference blocks for that purpose. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

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A number in parentheses indicates the year of last reapproval. This standard has been approved for use by agencies of the U. Department of Defense. Evaluation of these characteristics isintended to be used for comparing instruments and systems or,by periodic repetition, for detecting long-term changes in thecharacteristics of a given instrument or system that may beindicative of impending failure, and which, if beyond certainlimits, will require corrective maintenance. Instrument charac-teristics measured in accordance with this practice are ex-pressed in terms that relate to their potential usefulness forultrasonic testing. Instrument characteristics expressed inpurely electronic terms may be measured as described inE

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