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LABRORATORY MEASUREMENT OF
AIRBORNE SOUND TRANSMISSION LOSS Test Report no: QS‐ASTC‐4014/2019
Site Location:
FRASER RESIDENCE 31 Paterson Rd, Singapore 238522
Acoustic Consultant:
QSAFE PTE LTD 21 Toh Guan Road East, #09-01, Toh Guan Centre, Singapore 608609
Tel: (65) 8123 4812
Email: sales@qsafe.com.sg ; Web: www.qsafe.com.sg
Date of Report: 04 Feb 2019
COMMERCIAL-IN-CONFIDENCE Any use of the Report, use of any part of it or use of the name of the Consultant in direct or in indirect advertising or publicity
is forbidden
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AIRBORNE SOUND TRANSMISSION LOSS
Report Number: QS‐ASTC‐4014/2019
Date of Report: 04 Feb 2019
Monitoring Officer: Mr. Rajesh, BEnvOHS (Acoustic Consultant)
Date of Assessment: 30 Jan 2019
Client: VIX MARKETING PTE LTD 623, Aljunied Road,#03‐04, Aljunied Industrial Complex,
Singapore 389835 TEL: +65 67442880 Email: vixmar@singnet.com.sg
Attn: Eugene The
Location of Acoustic Testing:
FRASER RESIDENCE, (Bedroom‐Below Gym)
Terms & Conditions:
1. This Report is prepared for the client for the specific project and should not be used for any otherpurposes without the prior written consent of QSAFE PTE LTD.
2. QSAFE PTE LTD agrees to use reasonable diligence in the performance of the Services but nowarranties are given and none may be implied directly or indirectly relating to this Report. Under nocircumstances shall QSAFE PTE LTD be liable to the Client or its agents or representatives for anycollateral, special or consequential damage however arising with the Services provided by QSAFE PTE LTD herein.
3. This Report shall be respected for its confidentiality and any use of the Report, use of any part of it oruse of the name of the Consultant in direct or in indirect advertising or publicity is forbidden withoutthe written consent of QSAFE PTE LTD.
Mr. Rajesh, BEnvOHS (Acoustic Consultant)
Rajesh
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Client’s Reference: NA Qsafe Reference: #QS/INV/2019058
Report Title
Airborne Sound Transmission Loss Test Report
Job Description
To perform the Sound Transmission Class (STC) Test at Fraser Residence, 31 Paterson Rd, Singapore
238522. Acoustic Test was performed by QSafe Pte Ltd with reference to the AS 1276‐1979 and
AS/NZS 1276.1:1999.
Client Details:
VIX MARKETING PTE LTD
623, Aljunied Road,#03‐04,
Aljunied Industrial Complex, Singapore 389835
Acoustic Test Date
30 Jan 2019
Location of Assessment
FRASER RESIDENCE, (Bedroom‐Below Gym)
Assessment Results
Acoustic Test results are summarized in the following pages of this report.
Report Prepared & Approved By:
Ponnappan Rajesh (Acoustic Consultant) QSafe Pte Ltd Email: rajesh@qsafe.com.sg Phone: 8123 4812
Rajesh
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1.0 SUBJECT
Acoustic test was conducted by QSafe Pte Ltd at FRASER RESIDENCE, (Bedroom‐Below Gym) with
reference to AS 1276‐1979 and AS/NZS 1276.1:1999. The Sound Transmission Class (STC) of the
concrete ceiling were calculated using the procedures respectively specified by AS 1276‐1979 and
AS/NZS 1276.1:1999.
2.0 OBJECTIVE
The objective of the airborne sound transmission loss testing was to determine the sound
transmission class and select appropriate acoustic flooring materials. Recommended STC defined
45dB(A).
3.0 CALIBRATION DETAILS OF METERS USED
Calibration Details of the Sound Level Meter Used
Instrument Serial number Last Calibration Date Next recommended calibration date
Sound Level Meter Pulsar Instruments Plc Model: 43 (Type 1)
PN1379 15.10.2018 15.10.2019
4.0 METHOD OF TEST
Measurements of acoustic test is carried out with a noise meter with Octave band filter which
complies with the standards specified in the International Electrotechnical Commission Publication
651 (Type 1) and Publication 804 (Type 1). During the period of noise measurement, the microphone
of the noise meter was placed at bedroom directly below to the Gym and facing the source of noise.
The sound level meter was set up for ‘A’ weighted, slow response. Sound Level meter was covered
with Windshield for protecting from dust, moisture and other contaminants. It also reduces the
noise generated by ‘spurious’ events. At the end of the measurement, the Octave band sound level
meter was used the 1:1 octave band data and calculate the overall STC values.
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Specific:
The measurement was performed to comply with the requirements of AS 1191‐1985 “Method for
Laboratory Measurement of Airborne Sound Transmission Loss of Building Partitions”.
General:
The specimen (Acoustic materials) consisted of acoustic tile together with acoustic liner that was
positioned at the portion of the Gym room floor. Heavy Dumbbell was thrown from approx. 1m
height and the sound pressure levels (31.5Hz to 16KHz) were measured at below unit bedroom.
The testing was conducted with and without specimen. The testing also conducted with and without
acoustic liner. The difference between the sound pressure levels in the room were converted to
transmission loss values by correcting for the sound absorption characteristics of the receiving
room.
5.0 MEASUREMENT DETAILS
Measurement of Sound Levels
The Sound pressure levels in the rooms were averaged over space (by allowing microphone to
continuously during measurements) and time.
Absorption of receiving room
The Average reverberation time of the receiving room was determined for each 1/3‐Octave
frequency band. The equivalent absorption area (A) at each frequency was then determined using
the equation.
Correction of Background levels
The background sound levels for all frequency bands were measured and compared against the
signal levels reaching the receiving room. Table 2 shows the corrections to the receiving room sound
pressure levels for those frequencies with less than the required 10 dB margin above background.
The symbol ≥ indicates that the measured sound pressure level was less than the required 5dB
above background. In this case 1.7 dB was subtracted from the measured Sound pressure level, this
being the correction required for a measured Sound Pressure Level of 5dB above background.
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Table 2: Corrections applied to the receiving room sound pressure levels for those frequencies with
less than the required 10 dB margin above background.
Freq, Hz Background Corrections, dB
2000
2500
3150
4000
5000
0.6
0.8
0.6
1.3
≥1.7
Precision of results
Table 3 ‐ 95% confidence limits for the repeatability of airborne transmission loss results.
Freq, Hz Background Corrections, dB
100 ‐ 500
630 ‐ 2500
3150 ‐ 5000
0.8
0.5
0.9
Table 3 lists typical 95% confidence limits for the repeatability of airborne transmission loss (TL)
results for any given specimen). These values have been determined using the procedure outlined
in AS 1191 ‐1985.
6.0 ANALYSIS OF MEASUREMENTS
The airborne sound transmission loss is obtained by using the equation.
TL = Lsend ‐Lrecv + 10 Log10(S/A)
In this equation Lsend and Lrecv are the sound pressure levels (SPLs) measured noise level with and
without acoustic materials in the receiving room. ‘S’ in the area of specimen and ‘A’ is the equivalent
absorption area of the receiving room (m2) as detailed above.
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7.0 TEST RESULTS
Table 4 & Table 5 Presents the airborne transmission loss results. The final rows in the table give
the Sound Transmission Class (STC) as determined by the Australian Standard AS 1276‐1979,
AZ/NZS 1276.1:1999 and ISO‐717.1‐1996.
Table 4: Test Results, STC (Acoustic Tile Only)
Freq, Hz Specimen, TL
dB
100
125
160
200
250
315
400
500
630
800
1000
1250
1600
2000
2500
3150
4000
5000
27.9
29.7
33.6
35.5
35.8
37.3
44.4
48.4
51.4
54.6
56.1
57.3
58.2
57.2
55.8
56.2
58.0
59.3
STC 47
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0.0
10.0
20.0
30.0
40.0
50.0
60.0
70.0
0 1000 2000 3000 4000 5000 6000
TL, d
B
Freqency, Hz
TL, dB
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Table 5: Test Results, STC (Acoustic Tile together with Acoustic Liner)
Freq, Hz Specimen, TL
dB
100
125
160
200
250
315
400
500
630
800
1000
1250
1600
2000
2500
3150
4000
5000
23.9
25.7
29.6
31.5
31.8
33.3
40.4
44.4
47.4
50.6
52.1
53.3
54.2
53.2
51.8
52.2
54.0
55.3
STC 44
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0.0
10.0
20.0
30.0
40.0
50.0
60.0
0 1000 2000 3000 4000 5000 6000
TL, d
B
Frequency, Hz
TL, dB
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STC Calculation:
Freq, Hz Receiving SPL, dB
(without Acoustic)
Receiving SPL, dB
(with Acoustic Tile)
Specimen, TL
dB
100
125
160
200
250
315
400
500
630
800
1000
1250
1600
2000
2500
3150
4000
5000
67.8
68.7
67.9
68.4
67.3
66.4
66.1
67.5
67.7
67.8
68.0
68.0
67.9
66.6
64.9
64.6
66.1
66.7
41.0
40.1
35.4
34.0
32.6
30.2
22.8
20.2
17.4
14.3
13.0
11.8
10.8
10.5
10.2
9.5
9.2
8.5
27.9
29.7
33.6
35.5
35.8
37.3
44.4
48.4
51.4
54.6
56.1
57.3
58.2
57.2
55.8
56.2
58.0
59.3
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Freq, Hz Receiving SPL, dB
(without Acoustic)
Receiving SPL, dB
(with Acoustic Tile)
Specimen, TL
dB
100
125
160
200
250
315
400
500
630
800
1000
1250
1600
2000
2500
3150
4000
5000
67.8
68.7
67.9
68.4
67.3
66.4
66.1
67.5
67.7
67.8
68.0
68.0
67.9
66.6
64.9
64.6
66.1
66.7
45
44.1
39.4
38
36.6
34.2
26.8
24.2
21.4
18.3
17
15.8
14.8
14.5
14.2
13.5
13.2
12.5
23.9
25.7
29.6
31.5
31.8
33.3
40.4
44.4
47.4
50.6
52.1
53.3
54.2
53.2
51.8
52.2
54.0
55.3
8.0 CONCLUSION
Air borne transmission test result revealed that the Sound Transmission Class (STC) for Installing
Acoustic Tile met STC 47 and Installing Acoustic tile together with liner met STC 44 respectively.
should be noted that this study is based upon all the relevant information gathered during the
execution of this project and reflected our findings at the date/time and locations sampled.
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9.0 ABBREVIATION GUIDE
STC Sound Transmission Class
dB(A) decibels (A‐ weighted)
SPL Sound Pressure Level
AS Australian Standard
TL Transmission Loss
10.0 APPENDICES Appendix A Calibration certificate of the noise meter used
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Equipment Details Instrument Manufacturer Pulsar Instruments Plc Instrument Type Model 43 Description Sound Level MeterSerial Number PN1379
Calibration Procedure The instrument detailed above has been calibrated to the publish test and calibration data as detailed in the instrument hand book, using the techniques recommended in the latest revisions of the International Standards IEC 61672- I :2013, IEC 61672-1:2002, IEC 60651: 1979, IEC 60804:2001, IEC 61260: 1995, IEC 60942:2003, IEC 60942: 1997, IEC 61252: 1993, ANSI Sl .4-1983, ANSI Sl.11-1986 and ANSI S 1.43-1997 where applicable. Sound Level Meters: All Calibration procedures were carried out by substituting the microphone capsule with a suitable electrical signal, apart from the final acoustic calibration.
Calibration Traceability The equipment detailed above was calibrated against the calibration laboratory standards held by Cirrus Research plc. These are traceable to International Standards {A.O.6}. The standards are: Microphone Type B&K 4192 Serial Number 1920791 Calibration Ref. S6450Pistonphone Type B&K 4220 Serial Number 613843 Calibration Ref. S6388
Calibrated by Calibration Date 15 October 2018 Calibration Certificate Number 254231
This Calibration Certificate is valid for 12 months from the date above.
Pulsar Instruments plc, The Evron Centre, John Street, Filey, North Yorkshire, Y014 91) W Telephone: +44 (0) 1723 518011 Fax: +44 (0) 1723 518043
Email: sales@pulsarinstruments.com
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