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Report ID: 3741-051116-1
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Test Report: ISO 3741:2010-10-01, Acoustics – Determination of sound power levels and sound energy levels of noise source using sound pressure – Precision methods for reverberation test rooms.
Performed by: John Gagliardi Technical Director Technicon Acoustics jgagliardi@TechniconAcoustics.com Signature:
Laboratory Address: 8501 IBM Drive, Charlotte, NC 28262
Date of Test: May 18, 2016 Time of Test: 1100 Eastern Standard Time
Test Performed for: Technicon Acoustics Mark Nye Phone: 704-788-1131 E-mail: mnye@techniconacoustics.com Address: 4412 Republic Court Concord, NC 28027
Report ID: 3741-051116-1
The test results provided by this report are representative of the sample tested only. This report does not claim product certification, approval, or endorsement by NVLAP, NIST, or any agency of the Federal Government.
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Table 1. ISO 3741 Section 11.2: Noise Source Under Test
Sec 11.2.a Noise Source Description
Class/Group: Fan
Manufacturer: Lasko
Model: 1733
Part No.: NA
Serial No.: NA
Model Year: 2012
Dimensions
L (m): 1.54
W (m): 1.219
H (m): 0.862
Sec 11.2.b Auxiliary Equipment Treatment
A) None
Sec 11.2.c Mode of Operation
A) Speed setting 3
Sec 11.2.c Measurement Time Length (s)
45
Sec 11.2.d Installation and Mounting Conditions
A) Placed on Floor
B) Upright
Sec 11.2.e Location of noise source WRT to corner nearest door Location X (m) Lengthwise Y (m), Widthwise
1 3.1 3.55
2 5.2 3.9
3 1.75 3.3
4 2.7 2.4
5 6.6 4.1
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Table 2. ISO 3741 Section 11.3: Test Environment
Sec 11.3.a Description of test room
Dimensions
L (m): 7.92
W (m): 6.7
H (m): 3.81
Surface Treatment
Walls: Painted poured concrete
Ceiling: Painted poured concrete
Floors: Painted poured concrete
Sec 11.3.b Test Test Environment
Air temp (C): 23
Rel Humid (%): 62
Static Press (kPa): 99.4
Figure 1. Sketch showing room contents & location of noise source
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Table 3. ISO 3741 Secton 11.4 Instrumentation
Sec 11.4.a Microphones Manufacturer Model Serial No.
1 PCB 377A20 36084
2 PCB 377B20 142732
3 PCB 377B20 LW130610
4 PCB 377B20 LW130611
Preamplifier Manufacturer Model Serial No.
1 PCB 426E01 16863
2 PCB 426E01 LW022897
3 PCB 426E01 LW022899
4 PCB 426E01 LW022900
Sound Analyzer Manufacturer Model Serial No.
Sinus Soundbook 6378
Calibrator Manufacturer Model Serial No.
Bruel & Kjaer 4230 1472046
Sec 11.4.b Calibration of System
Location: Technicon Acoustics Lab
Date: May 11, 2016
Calibration of Sound Calibrator:
Location: NovaStar
Date: October 8, 2015
Method: NIST, ANSI
Calibration of Ref Sound Source
Location: IBM, Hudson Valley, NY
Date: 4/12/2016
Method: ANSI S12.5, ISO 6926-1999
Measured RPM: 3537
RPM Tolerance: 3520 to 3550 RPM
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Table 4. ISO 3741 Section 11.5 Acoustical Data
Sec 11.5.a Method: Direct
Sec 11.5.b Microphone locations WRT
corner nearest door
Microphone X (m) Y (m) Z (m)
1 4.32 1.58 1.55
2 1.75 4.27 1.95
3 5.84 5.4 1.15
4 6.62 3.3 2.35
5 5.79 2.19 1.55
6 1.75 2.21 1.95
7 3.54 5.15 1.15
8 6.68 5.05 2.35
Table 5. Section 11.5.c and 11.5.d. Sound Pressure Level from Noise Source (dBL)
Frequency Mic Loc
(Hz) 1 2 3 4 5 6 7 8
100
125
160
200
250
315
400
500
630
800
1000
1250
1600
2000
2500
3150
4000
5000
6300
8000
10000
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Table 6. Section 11.5.c and 11.5.d. Background Noise Level (dBL)
Frequency Mic Loc
(Hz) 1 2 3 4 5 6 7 8
100
125
160
200
250
315
400
500
630
800
1000
1250
1600
2000
2500
3150
4000
5000
6300
8000
10000
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Table 7. Section 11.5.e. Corrections necessary for background noise
Frequency Mic Loc
(Hz) 1 2 3 4 5 6 7 8
100
125
160
200
250
315
400
500
630
800
1000
1250
1600
2000
2500
3150
4000
5000
6300
8000
10000
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Table 8. Section 11.5.f. Sound Power Levels, 1/3 Octave and Overall, Linear and A-wgt
1/3 Octave Linear A-wgt
Frequency Lw Lwa
(Hz) (dBL) (dBA)
100
125
160
200
250
315
400
500
630
800
1000
1250
1600
2000
2500
3150
4000
5000
6300
8000
10000
Overall
Table 9. Section 11.5.f. Sound Power Levels, 1/1 Octave Linear and A-wgt
1/1 Octave Linear A-wgt
Frequency Lw Lwa
(Hz) (dBL) (dBA)
125
250
500
1000
2000
4000
8000