ASTM E596-22
(Test Method)Standard Test Method for Laboratory Measurement of Noise Reduction of Sound-Isolating Enclosures
Standard Test Method for Laboratory Measurement of Noise Reduction of Sound-Isolating Enclosures
SIGNIFICANCE AND USE
5.1 The noise reduction of an enclosure is a property of the enclosure, the location of the sound source used to measure noise reduction, and the space in which the enclosure is placed. It is not a property of the enclosure alone, and its measurement under different conditions can be expected to give different results. When the noise reduction is measured in accordance with this test method, the sound source is outside the enclosure and the sound field outside the enclosure approximates a diffuse sound field. Measurements made in accordance with this test method can be expected to be reproducible from one laboratory to another.
5.2 The noise reduction measured in accordance with this test method may be used for the following purposes:
5.2.1 To rank the order of sound-isolating enclosures according to noise isolation class, NIC.
5.2.2 To estimate the highest one-third octave band sound pressure levels that can occur outside the enclosure without exceeding specified sound pressure levels inside the enclosure.
5.2.3 To estimate the one-third octave band sound pressure levels that will occur inside the enclosure with specified sound pressure levels outside.
5.3 The noise reduction measured in accordance with this test method may not estimate accurately the isolation that the enclosure will provide when it is used to isolate a noise source inside it from the space outside. The user should be cautious when using noise reductions measured by this test method to evaluate enclosures used to enclose noise sources.
5.4 Sound-isolating enclosures are frequently made from prefabricated modular panels. The noise reduction measured by this test method applies to the complete enclosure and not to individual panels from which it is made and cannot be used to infer the sound transmission loss of the individual panels.
5.5 Specifications for sound-isolating enclosures may include reference to noise reduction and noise isolation class measured in accordance with th...
SCOPE
1.1 This test method covers the reverberation room measurement of the noise reduction of sound-isolating enclosures.
1.2 The noise isolation class may be determined from the noise reduction measured in accordance with this test method.
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.4 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.
General Information
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Standards Content (Sample)
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.
Designation: E596 − 22
Standard Test Method for
Laboratory Measurement of Noise Reduction of Sound-
1
Isolating Enclosures
This standard is issued under the fixed designation E596; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope 3. Terminology
1.1 This test method covers the reverberation room mea- 3.1 Terms used in this standard are defined either in Termi-
surement of the noise reduction of sound-isolating enclosures. nology C634 or within this standard. The definitions of terms
explicitly given within this standard take precedence over
1.2 The noise isolation class may be determined from the
definitions given in Terminology C634. The definitions within
noise reduction measured in accordance with this test method.
Terminology C634 and this standard take precedence over any
1.3 This standard does not purport to address all of the
other definitions of defined terms found in any other
safety concerns, if any, associated with its use. It is the
documents, including other documents referenced in this stan-
responsibility of the user of this standard to establish appro-
dard.
priate safety, health, and environmental practices and deter-
3.2 Definitions of Terms Specific to This Standard:
mine the applicability of regulatory limitations prior to use.
3.2.1 sound-isolating enclosure, n—any enclosure that com-
1.4 This international standard was developed in accor-
pletely encloses a space, is intended to provide sound isolation
dance with internationally recognized principles on standard-
for the enclosed space, and can be tested in a reverberation
ization established in the Decision on Principles for the
room.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical 3.2.2 useful volume of a sound isolating enclosure,
3 3
Barriers to Trade (TBT) Committee. UV[L ](m ), n—the part of the space inside the enclosure in
which the noise reduction is of interest. For example, in an
2. Referenced Documents audiometric booth, the useful volume is the part of the space
2 inside the booth where a test subject’s head is likely to be
2.1 ASTM Standards:
during audiometric tests.
C423 Test Method for SoundAbsorption and SoundAbsorp-
tion Coefficients by the Reverberation Room Method
4. Summary of Test Method
C634 Terminology Relating to Building and Environmental
4.1 The enclosure to be tested is placed in a reverberation
Acoustics
E413 Classification for Rating Sound Insulation room and prepared for testing. The background noise levels
inside the enclosure and in the reverberation room are mea-
2.2 ANSI Standards:
3 sured in one-third octave bands. After bands of random noise
S1.4 Specification for Sound Level Meters
are produced in the reverberation room, one-third octave band
S1.11 Specification for Octave-Band and Fractional-Octave-
3 sound pressure levels are measured at several points in the
Band Analog and Digital Filters
reverberation room and at appropriate points inside the enclo-
sure. The noise reduction in each one-third octave band is the
difference between the space-averaged sound pressure level in
1
ThistestmethodisunderthejurisdictionofASTMCommitteeE33onBuilding
the reverberation room and the space-averaged sound pressure
and Environmental Acoustics and is the direct responsibility of Subcommittee
level inside the enclosure. The noise isolation class (NIC) may
E33.03 on Sound Transmission.
be determined from the noise reduction data.
Current edition approved Oct. 1, 2022. Published October 2022. Originally
approved in 1977. Last previous edition approved in 2016 as E596 – 96 (2016).
DOI: 10.1520/E0596-22.
5. Significance and Use
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
5.1 The noise reduction of an enclosure is a property of the
Standards volume information, refer to the standard’s Document Summary page on
enclosure, the location of the sound source used to measure
the ASTM website.
3
noise reduction, and the space in which the enclosure is placed.
Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
4th Floor, New York, NY 10036, http://www.ansi.org. It is not a property of the enclosure alone, and its measurement
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box
...
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: E596 − 96 (Reapproved 2016) E596 − 22
Standard Test Method for
Laboratory Measurement of Noise Reduction of Sound-
1
Isolating Enclosures
This standard is issued under the fixed designation E596; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope
1.1 This test method covers the reverberation room measurement of the noise reduction of sound-isolating enclosures.
1.2 The noise isolation class may be determined from the noise reduction measured in accordance with this test method.
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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.4 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.
2. Referenced Documents
2
2.1 ASTM Standards:
C423 Test Method for Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method
C634 Terminology Relating to Building and Environmental Acoustics
E413 Classification for Rating Sound Insulation
2.2 ANSI Standards:
3
S1.4 Specification for Sound Level Meters
3
S1.11 Specification for Octave-Band and Fractional-Octave-Band Analog and Digital Filters
3. Terminology
3.1 Definitions and Symbols—Except as noted in 3.2, the terms and symbols used in this test method are defined in Terminology
C634.
3.1 Terms used in this standard are defined either in Terminology C634 or within this standard. The definitions of terms explicitly
1
This test method is under the jurisdiction of ASTM Committee E33 on Building and Environmental Acoustics and is the direct responsibility of Subcommittee E33.03
on Sound Transmission.
Current edition approved April 1, 2016Oct. 1, 2022. Published April 2016October 2022. Originally approved in 1977. Last previous edition approved in 20092016 as
E596 – 96 (2009).(2016). DOI: 10.1520/E0596-96R16.10.1520/E0596-22.
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.
3
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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E596 − 22
given within this standard take precedence over definitions given in Terminology C634. The definitions within Terminology C634
and this standard take precedence over any other definitions of defined terms found in any other documents, including other
documents referenced in this standard.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 sound-isolating enclosure—enclosure, n—any enclosure that completely encloses a space, is intended to provide sound
isolation for the enclosed space, and can be tested in a reverberation room.
3 3
3.2.2 useful volume of a sound isolating enclosure—enclosure, UV[L ](m ), n—the part of the space inside the enclosure in which
the noise reduction is of interest. For example, in an audiometric booth, the useful volume is the part of the space inside the booth
where a test subject’s head is likely to be during audiometric tests.
4. Summary of Test Method
4.1 The enclosure to be tested is placed in a reverberation room and prepared for testing. The background noise levels inside the
enclosure and in the reverberation room are measured in one-third octave bands. After bands of random noise are produced in the
reverberation room, one-third octave band sound pressure levels are measured at several points in the reverberation room and at
appropriate points inside the enclosure. The noise reduction in each one-third octave band is the difference between the
sp
...
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