ASTM E596-96(2002)
(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
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 and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: E 596 – 96 (Reapproved 2002)
Standard Test Method for
Laboratory Measurement of Noise Reduction of Sound-
1
Isolating Enclosures
This standard is issued under the fixed designation E 596; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope volume is the part of the space inside the booth where a test
subject’s head is likely to be during audiometric tests.
1.1 This test method covers the reverberation room mea-
surement of the noise reduction of sound-isolating enclosures.
4. Summary of Test Method
1.2 The noise isolation class may be determined from the
4.1 The enclosure to be tested is placed in a reverberation
noise reduction measured in accordance with this test method.
room and prepared for testing. The background noise levels
1.3 This standard does not purport to address all of the
inside the enclosure and in the reverberation room are mea-
safety concerns, if any, associated with its use. It is the
sured in one-third octave bands. After bands of random noise
responsibility of the user of this standard to establish appro-
are produced in the reverberation room, one-third octave band
priate safety and health practices and determine the applica-
sound pressure levels are measured at several points in the
bility of regulatory limitations prior to use.
reverberation room and at appropriate points inside the enclo-
2. Referenced Documents sure. The noise reduction in each one-third octave band is the
difference between the space-averaged sound pressure level in
2.1 ASTM Standards:
the reverberation room and the space-averaged sound pressure
C 423 Test Method for Sound Absorption and Sound Ab-
2
level inside the enclosure. The noise isolation class (NIC) may
sorption Coefficients by the Reverberation Room Method
2
be determined from the noise reduction data.
C 634 Terminology Relating to Environmental Acoustics
2
E 413 Classification for Rating Sound Insulation
5. Significance and Use
2.2 ANSI Standards:
3 5.1 The noise reduction of an enclosure is a property of the
S1.4 Specification for Sound Level Meters
enclosure, the location of the sound source used to measure
S1.11 Specification for Octave-Band and Fractional-
3 noise reduction, and the space in which the enclosure is placed.
Octave-Band Analog and Digital Filters
It is not a property of the enclosure alone, and its measurement
3. Terminology under different conditions can be expected to give different
results. When the noise reduction is measured in accordance
3.1 Definitions and Symbols—Except as noted in 3.2, the
with this test method, the sound source is outside the enclosure
terms and symbols used in this test method are defined in
and the sound field outside the enclosure approximates a
Terminology C 634.
diffuse sound field. Measurements made in accordance with
3.2 Definitions of Terms Specific to This Standard:
this test method can be expected to be reproducible from one
3.2.1 sound-isolating enclosure—any enclosure that com-
laboratory to another.
pletely encloses a space, is intended to provide sound isolation
5.2 The noise reduction measured in accordance with this
for the enclosed space, and can be tested in a reverberation
test method may be used for the following purposes:
room.
5.2.1 To rank the order of sound-isolating enclosures ac-
3.2.2 useful volume of a sound isolating enclosure—the part
cording to noise isolation class, NIC.
of the space inside the enclosure in which the noise reduction
5.2.2 To estimate the highest one-third octave band sound
is of interest. For example, in an audiometric booth, the useful
pressure levels that can occur outside the enclosure without
exceeding specified sound pressure levels inside the enclosure.
1
This test method is under the jurisdiction of ASTM Committee E33 on
5.2.3 To estimate the one-third octave band sound pressure
Environmental Acoustics and is the direct responsibility of Subcommittee E33.03 on
levels that will occur inside the enclosure with specified sound
Sound Transmission.
pressure levels outside.
Current edition approved Jan. 10, 1996. Published April 1996. Originally
published as E 596 – 77. Last previous edition E 596 – 94a.
5.3 The noise reduction measured in accordance with this
2
Annual Book of ASTM Standards, Vol 04.06.
test method may not estimate accurately the isolation that the
3
Available from American National Standards Institute, 25 W. 43rd St., 4th
enclosure will provide when it is used to isolate a noise source
Floor, New York, NY 10036.
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