ASTM F2544-11(2018)
(Test Method)Standard Test Method for Determining A-Weighted Sound Power Level of Central Vacuum Power Units
Standard Test Method for Determining A-Weighted Sound Power Level of Central Vacuum Power Units
SIGNIFICANCE AND USE
4.1 The test results enable the comparison of A-weighted sound emission from central vacuum power units when tested under the condition of this test method.
SCOPE
1.1 This test method calculates the overall A-weighted sound power level emitted by central vacuum power units, intended for operation in domestic applications. This standard applies to the power unit only at the power unit location. To test the sound power level of a central vacuum at the user’s location, refer to Test Method F1334.
1.2 A-weighted sound pressure measurements are performed on a mounted central vacuum power unit in a semi-reverberant room. This test method determines sound power by a comparison method for small noise sources, that is, comparison to a broad band reference sound source.
1.3 This test method describes a procedure for determining the A-weighted sound power level of small noise sources. This test method uses a non-special semi-reverberant room.
1.4 Results are expressed as A-weighted sound power level in decibels (referenced to 1 pW).
1.5 The values stated in inch pound units are to be regarded as the standard. The values in parentheses are for information only.
1.6 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.
1.7 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
Relations
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: F2544 − 11 (Reapproved 2018)
Standard Test Method for
Determining A-Weighted Sound Power Level of Central
Vacuum Power Units
This standard is issued under the fixed designation F2544; 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 2. Referenced Documents
1.1 This test method calculates the overall A-weighted 2.1 ASTM Standards:
C634 Terminology Relating to Building and Environmental
sound power level emitted by central vacuum power units,
Acoustics
intended for operation in domestic applications. This standard
E177 Practice for Use of the Terms Precision and Bias in
appliestothepowerunitonlyatthepowerunitlocation.Totest
ASTM Test Methods
the sound power level of a central vacuum at the user’s
E691 Practice for Conducting an Interlaboratory Study to
location, refer to Test Method F1334.
Determine the Precision of a Test Method
1.2 A-weighted sound pressure measurements are per-
F820 Test Method for Measuring Air Performance Charac-
formed on a mounted central vacuum power unit in a semi-
teristics of Central Vacuum Cleaning Systems
reverberantroom.Thistestmethoddeterminessoundpowerby
F1334 Test Method for Determining A-Weighted Sound
a comparison method for small noise sources, that is, compari- Power Level of Vacuum Cleaners
son to a broad band reference sound source.
2.2 ANSI Standards:
S1.10 Method for the Calibration of Microphones
1.3 This test method describes a procedure for determining
S1.26 Method for the Calculation of the Absorption of
theA-weighted sound power level of small noise sources. This
Sound by the Atmosphere
test method uses a non-special semi-reverberant room.
S1.43 Specifications for Sound Level Meters, IEC 804 and
1.4 Results are expressed as A-weighted sound power level
IEC 61672
in decibels (referenced to 1 pW). S12.31 Precision Methods for the Determination of Sound
Power Levels of Broad Band Noise Sources in Reverber-
1.5 The values stated in inch pound units are to be regarded
ant Rooms
as the standard. The values in parentheses are for information
S12.32 Precision Methods for Determination of Sound
only.
Power Levels for Discrete Frequency and Narrow Band
Noise Sources in Reverberant Rooms
1.6 This standard does not purport to address all of the
S12.33 Engineering Methods for Determination of Sound
safety concerns, if any, associated with its use. It is the
Power Levels of Noise Sources in a Special Reverberant
responsibility of the user of this standard to establish appro-
Test Room
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
2.3 ISO Standards:
ISO 3741, 3742, and 3743 are similar to and may be used in
1.7 This international standard was developed in accor-
place of ANSI S12.31, S12.32, and S12.33 respectively
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
2.4 IEC Standard:
Development of International Standards, Guides and Recom-
60704.1 TestCodefortheDeterminationofAirborneAcous-
mendations issued by the World Trade Organization Technical
tical Noise Emitted by Household and Similar Electrical
Barriers to Trade (TBT) Committee. Appliances
1 2
This test method is under the jurisdiction ofASTM Committee F11 on Vacuum For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Cleaners and is the direct responsibility of Subcommittee F11.25 on Sound contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Measurement. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved March 1, 2018. Published March 2018. Originally the ASTM website.
approved in 2006. Last previous edition approved in 2011 as F2544 – 11. DOI: Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
10.1520/F2544-11R18. 4th Floor, New York, NY 10036.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F2544 − 11 (2018)
FIG. 1 Sound Test Layout
3. Terminology 5. Test Room Requirements
5.1 The test room shall be semi-reverberant. It shall contain
3.1 Unless otherwise indicated, definitions are in accor-
sufficiently little sound absorption material so the requirements
dance with Terminology C634.
of 5.2 can be met. It shall be large enough to allow a
3.2 Definitions:
semi-circle with a 6-ft radius centered at the sound source (the
3.2.1 population, n—total of all of the units of the particular
central vacuum power unit) that shall be clear of all
model or type, or both, of central vacuum power units being
obstruction, including the operator, during the measurements.
tested.
5.1.1 The test room should be plumbed for the central
3.2.2 population sample or sample, n—three or more units,
vacuum according to the manufacturer’s instructions using
randomly taken from the population.
standard 2-in. outside diameter thin-wall PVC tubing. Units
with multiple exhaust ports shall be plumbed with multiple
3.2.3 reference sound source, n—standard source of broad-
exhaust lines per manufacturer’s instructions. Units without
band sound with a certified set of sound power emissions.
exhaust ports shall not have an exhaust line plumbed outside
3.2.4 source, n—device that emits sound.
the test room. The power unit is to be mounted on the wall per
3.2.5 test unit or units, n—single central vacuum power unit
the manufacturer’s recommendations.
of the model or type, or both, being tested.
5.2 Three microphone positions are to be used. The micro-
phone positions are to be on a semi-circle with a 6-ft radius
4. Significance and Use
centered at the sound source (the central vacuum power unit).
4.1 The test results enable the comparison of A-weighted Themicrophonepositionswillbespaced30°fromthewalland
sound emission from central vacuum power units when tested 60° apart from each other on the semi-circle at a height of 60
under the condition of this test method. in. (1.5 m). The microphone should be oriented per the
F2544 − 11 (2018)
TABLE 1 Corrections for Background Noise Levels
7.2 Warm up—Operate the cleaners for 10 min just prior to
Difference between sound pressure Correction to be subtracted from sound making sound pressure level measurements in the same con-
level measured with sound source pressure level measured with sound
figuration as shown in Fig. 1.
operating and background noise source operating to obtain sound pressure
level alone, dB level due to sound source alone, dB
7.3 Test Configuration:
Less than 6 No correction allowed
7.3.1 The inlet tube and exhaust line should be plumbed
with PVC tubing as far away from the test unit as necessary or
out of the test room to prevent from contaminating the sound
90.5
test. Refer to Fig. 1 for proper test set up of test unit, intake
10 0.5
tube, and exhaust line.
Greater than 10 0
7.3.2 A muffler should only be attached to the exhaust line
beside the test unit if it is supplied with the test unit. (See Fig.
2.)
7.3.3 The “end of intake line muffler” is part of the standard
microphone manufacturer’s instructions. Refer to Fig. 1 for
test set-up and should be used on all test units. Its intent is to
layout. These positions shall result in a standard deviation of
dampen any noise created by the air rushing into the inlet tube
thethreesoundpressuremeasurementsofnotmorethan2.3dB
topreventcontaminationofthesoundmeasurementsofthetest
when measuring the reference sound source.
unit. This muffler is equipped with a ⁄4-in. sharp edge orifice
plate (taking the place of the hose and floor tool). (See Fig. 2.)
5.3 Environmental—Ambient test conditions within the test
7.3.4 The “end of exhaust line muffler” is part of the
room shall be controlled to 70 6 5°F (21 6 3°C) and 30 to
standard test set-up and should be used on all test units. Its
70 % relative humidity.
intent is to dampen any noise created by the air rushing out of
5.4 Also, any room which has qualified in accordance with
the exhaust tube to prevent contamination of the sound
ANSI S1.26, S12.31, S12.32, S12.33, ISO 3741, 3742, and
measurements of the test unit. This muffler does not include an
3743 may be used to measure the sound power levels of
orifice plate. (See Fig. 3.)
vacuum cleaners.
7.3.5 The dust bag or primary filter shall be new (if
5.5 ThemeasuredA-weightedsoundpressurelevelsshallbe
applicable).
corrected for the influence of background noise according to
7.3.6 Voltage—Tests are to be conducted at the nameplate
Table 1. When the steady background-noise sound pressure
rated voltage (61 %) and frequency (61 Hz) throughout the
level is more than 6 dB below the sound pressure level at each
test. For cleaners with dual nameplate voltage ratings, conduct
measurement point, the measured A-weighted sound pressure
sound tests at the highest voltage.
levels shall be corrected for the influence of background noise.
8. Location of Sound Sources and Equipment
If this difference is less than 6 dB, no correction is allowed and
any reported data must include a note indicating that the
8.1 Locate the central vacuum power unit at the position
background noise requirements of this test method were not
determined in 5.1.1.
satisfied.
8.2 Locate the reference sound source on the floor (near but
not touching) the wall, below the intended location of the
6. Instrumentation and Equipment
vacuum power unit. The microphones should be placed on a
6.1 Acoustical Instrumentation—The sound measurement
6-ftradiusfromthecenterofthevacuumpowerunit’sintended
system shall be as specified in ANSI S1.43.
location while testing the reference sound source.
6.2 Voltage Regulator System—The regulator shall be ca-
9. Measurement Procedure
pable of maintaining the vacuum cleaner’s rated voltage
9.1 Check the calibration of each microphone according to
(61 %) and frequency (61 Hz) having a waveform that is
the instrument manufacturer’s directions.
essentially sinusoidal with 3 % maximum harmonic distortion
for the duration of the test.
9.2 At each of the three microphone positions determined in
5.2, measure the backgroundA-weighted sound pressure level.
6.3 Reference Sound Source—The reference sound source
Step 9.2 can be ignored if it is known that the background
shall meet the requirements of Section 9 of ANSI S12.31.
sound pressure levels are more than 10 dB below the sound
6.4 Instrumentation:
pressure levels of all sources being considered at all micro-
6.4.1 Thermometer, accurate to 63°F (62°C).
phone locations.
6.4.2 A means of measuring relative humidity, accurate to
within 62 % over the range used. 9.3 With the reference sound source in the location defined
inSection8andrunninginaccordancewiththemanufacturer’s
7. Operation of Central Vacuum Cleaner recommendations, measure the A-weighted sound pressure
level at the microphone positions (as described in 5.2). After
7.1 Run in—Operate new test cleaners continuously for at
making the necessary corrections for the influence of the
least 10 min prior to testing. The central vacuum power unit
background noise at each microphone location and ensuring
should be run with the orifice adapter tube (as specified in Test
Method F820) connected to the power unit inlet (for run-in
only). Further information is provided in ANSI S1.10.
F2544 − 11 (2018)
FIG. 2 End of Intake Line Muffler
calculate the space-averagedA-weighted sound pressure level,
L , of the test unit using the equation in 9.3.
p
9.5 Using the space-averaged A-weighted sound pressure
levels, L and L , and the known A-weighted sound power
pr p
level of the reference sound source, calculate the A-weighted
sound power level of the test unit using the procedure in 10.1.
9.6 Using the same test unit, repeat 9.2 – 9.5 two additional
times for a total of three test runs.
9.7 The sound power level (score) for each individual test
unit is the arithmetic average of the A-weighted sound power
levelsofthreetestrunsthatmeettherepeatabilityrequirements
of Section 14. See Annex A1 for a procedural example and to
FIG. 3 Exhaust Line Muffler
determine if additional test runs need to be conducted.
9.8 A minimum of two additional test units of the same
model must be selected in accordance with the sampling
statement in Section 11. Repeat 9.2 – 9.7 for each additional
that the standard deviation requirement of 5.2 is met, calculate
test unit. See Annex A1 for a procedural example and to
the space-averaged A-weighted sound pressure level of the
determine if additional units need to be tested.
reference sound source, L , using the equation:
pr
9.9 The best estimate of A-weighted sound power level for
N
m
L /10
the population of the central vacuum power unit model being
i
L or L 5 10log 10 (1)
H J
p pr (
N
i51
m
tested is the arithmetic mean ofA-weighted sound power level
of the sample population meeting the requirements of the
where:
sampling statement in Section 11.
L or L = A-weighted sound pressure level averaged over
p pr
all microphone positions for a single source
10. Calculation of A-weighted Sound Power Level for the
location, dB,
Comparison Method
L = A-weighted sound pressure level for the ith
i
microphone position, dB, and 10.1 The A-weighted sound power level produced by the
N = number of microphone positions. testunitshallbecalculatedasfollows.SubtracttheA-weighted
m
sound pressure level produced by the reference sound source
9.4 Remove the reference sound source and mount the test
(corrected for background noise according to 5.5) from the
unit per the manufacturer’s recommendations. The micro-
A-weighted sound pressure level of the test unit under test
phones should be positioned as shown in Fig. 1. With the unit
(corrected for the background noise according to 5.5).Add the
operating in accordance with Section 7, measure the
difference to the known A-weighted sound power level pro-
A-weighted sound pressure level at the same microphone
duced by the reference sound source.
locations. After making the necessary corrections for the
influenceofthebackgroundnoiseateachmicrophonelocation, L 5 L 1L 2 L (2)
W wr p pr
F2544 − 11 (2018)
TABLE 2 Repeatability and Reproducibility
where:
Standard DeviationRepeatability Standard Deviation Repr
...
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