ASTM E750-98

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: E 750 – 98
Standard Practice for
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Characterizing Acoustic Emission Instrumentation
This standard is issued under the fixed designation E 750; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 1.7 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
1.1 This practice is recommended for use in testing and
responsibility of the user of this standard to establish appro-
measuring operating characteristics of acoustic emission elec-
priate safety and health practices and determine the applica-
tronic components or units. (See Appendix X1 for a description
bility of regulatory limitations prior to use.
of components and units.) It is not intended that this practice be
used for routine checks of acoustic emission instrumentation,
2. Referenced Documents
but rather for periodic calibration or in the event of a
2.1 ASTM Standards:
malfunction. The sensor is not addressed in this document
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E 1316 Terminology for Nondestructive Examinations
other than suggesting methods for standardizing system gains
2.2 ANSI Standard:
(equalizing them channel to channel) when sensors are present.
ANSI/IEEE 100-1984 Dictionary of Electrical and Elec-
1.2 Where the manufacturer provides testing and measuring
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tronic Terms
details in an operating and maintenance manual, the manufac-
2.3 Other Documents:
turer’s methods should be used in conjunction with the
Manufacturer’s Operating and Maintenance Manuals perti-
methods described in this practice.
nent to the specific instrumentation or component
1.3 Difficult or questionable instrumentation measurements
should be referred to electronics engineering personnel.
3. Terminology
1.4 The methods set forth in this practice are not intended to
3.1 Definitions—For definitions of additional terms relating
be either exclusive or exhaustive.
to acoustic emission, refer to Terminology E 1316.
1.5 The methods (techniques) used for testing and measur-
ing the components or units of acoustic emission instrumenta-
4. Apparatus
tion, and the results of such testing and measuring should be
4.1 The basic test instruments required for measuring the
documented. Documentation should consist of photographs,
operating characteristics of acoustic emission instrumentation
charts or graphs, calculations, and tabulations where appli-
include:
cable.
4.1.1 Variable Sine Wave Generator,
1.6 AE systems that use mini or micro computers to control
4.1.2 True RMS Voltmeter,
the collection, storage, display, and analysis of data are in
4.1.3 Oscilloscope,
common use. Features of the computer-based systems include
4.1.4 Variable Attenuator, graduated in decibels, and
a wide selection of measurement parameters relating to the AE
4.1.5 Tone Burst Generator.
event. This selection, however, is usually made after the data
4.2 Additional test instruments should be used for more
have been acquired. This implies that the AE signals are
specialized measurements of acoustic emission instrumenta-
individually recorded for later analysis, or that all the available
tions or components. They are as follows:
parameters are measured on every AE signal that exceeds the
4.2.1 Variable-Function Generator,
selected threshold. The latter is usually the case. The manu-
4.2.2 Time Interval Meter,
facturer provides a specification for each system that specifies
4.2.3 Frequency Meter, or Counter,
the operating range and conditions for the system. All calibra-
4.2.4 Random Noise Generator,
tion and acceptance testing of computer-based AE systems
4.2.5 Spectrum Analyzer,
must use the manufacturer’s specification as a guide. This
4.2.6 D-C Voltmeter,
practice does not cover testing of the computer or computer
4.2.7 Pulse-Modulated Signal Generator,
peripherals.
4.2.8 Variable Pulse Generator, and
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This practice is under the jurisdiction of ASTM Committee E-7 on Nonde-
structive Testing and is the direct responsibility of Subcommittee E07.04 on
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Acoustic Emission. Annual Book of ASTM Standards, Vol 03.03.
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Current edition approved May 10, 1998. Published July 1998. Originally Available from American National Standards Institute, 11 West 42nd Street,
published as E 750 – 80. Last previous edition E 750 – 88(1993)e1. 13th Floor, New York, NY 10036.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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E750–98
4.2.9 Phase Meter, necting cables. All measurements and tests should be docu-
4.2.10 Electronic AE Simulator. mented. The preamplifier sho
...