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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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Figure 2. Photo of test setup

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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

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Table 10. Section 11.5.g Expanded Measurement Uncertainty “U”

Frequency U

(Hz) (dB)

100

125

160

200

250

315

400

500

630

800

1000

1250

1600

2000

2500

3150

4000

5000

6300

8000

10000

Overall A-wgt