audio/acoustic pb-2 test chamber specification...c (3cm) cns 7333 0.0306 kcal/m.hr.±c (4cm) cns...
TRANSCRIPT
Audio/Acoustic PB-2
Test Chamber Specification
Issue by: Justin Chen
E-mail: [email protected]
TEL+886-3-358-5399
Contents 1. Introduction
2. Mechanical & Electrical Specification
3. Acoustical Specification
3-1 Basic Raw Materials
3-2 Acoustic Performance
3-2.1 Designs Anticipated
3-2.2 Test Results
3-2.3 Test Equipments
1. Introduction:
The PB-2 test chamber is special designed for the acoustic testing of consumer products.
(As like: Headphone/Headset/Tablet/NB/PMP/Smart Phone…etc) The chamber can provide
a reliable and stable test environment. There is artificial mouth, ear or microphone integrated
inside for advanced acoustic analysis. There are several reserved connection interface for
audio equipment as like USB port and one I/O port is reserved for automatic control. The
noise shielding ability is different by the building material and mechanical design. Please see
the related document for more detail.
2. Mechanical & Electrical Specification Outside Dimension: L:70cm * W:80cm * H:60cm
90 cm (Max Height when Box Open )
Inside Dimension: L:55cm * W:65cm * H:45cm
Net Weight: ~ 280Kg
Construction: The Aluminum alloy steel plate
Power Request: 100VAC~230VAC /3A
Sound Insulation Ability: > 40dB(A-Weighting) SPL ref. 20uPa
Operating Working Space: ~120 cm (W) X 120 cm (L)
Air compressor Request 6 Kg/ cm^2
Interfaces for Connection BNC Audio Connectors x 10 sets
USB Port x 2 sets
Phone Jack x 2 sets
RJ-45 Ethernet Port x 1 set
D-Type 9 pin x 1 set
3. Acoustical Specification
3-1 Basic Raw Materials:
A. The Aluminum alloy steel plate adds the base varnish ~ 10mm
B. Mineral Fiber Acoustic Board ~ 10mm
C. SBR(Styrene Butadiene Rubber) foaming board ~ 10mm
D. Sound Absorption: BASF Basotect (Color White) ~50mm
Material data information below as :
29/06/2008 INTERNAL 1
Density密度9,5 ± 1,5 kg/m³ EN ISO 845
0,61 ± 0,1 lb/ft³
compressive stress at 10%
4 - 20 kPa DIN 53 421
0,73 - 2,9 lb/in²
coefficient of sound absorption 吸音率90 - 95 % DIN 52 215
t = 50 mm [2 inch]
f = 2000 Hz
Physical properties of Basotect®
Basotect 基本物性
29/06/2008 INTERNAL 2
Physical properties of Basotect®
Basotect 基本物性
properties units test method values
density kg/m³ EN ISO 845 9.5 ± 1.5
lb/ft³ 0.7 ± 0.1
compressive stress kPa DIN 53421 4 - 20 at 10% compression lb/in² 0,73 - 2,9
max. intendation force N BASF-method 45
tensile strength kPa DIN 53571 > 120
Elongation at break (tensile) % DIN 53571 > 10
compressive strengthat 40% compression kPa DIN 53577 6 - 20
thermal conductivity [10°C] W/mK DIN 52612 < 0.035[50°F] BTUin/hft²°F < 0.24
compression set50% / 23 °C / 72h % DIN 53572 10 - 3550% / 70 °C / 22h 5 - 30
29/06/2008 INTERNAL 3
properties units test method values
diffusion resistance factor µ DIN 52615 app. 1-2
acoustic absorptiont = 2.0 in / f = 2000 Hz % DIN 52215 > 90t = 1.6 in / f = 2000 Hz DIN 52212 > 0.9
length specific air flow resistance kNs/m4 DIN EN 29053 8 - 20
long term application 長時間工作溫度temperature °C app. 200
°F app. 392
Physical properties of Basotect®
Basotect 基本物性
29/06/2008 INTERNAL 4
properties unit test method values
fogging % DIN 75210, meth. A > 90mg DIN 75210, meth. B < 0,5
fire performance DIN 4102 B1
UL 94 94 V-0
94 HF-1
NF P 92-501 M1
FAR 25.855 a1 fulfilled
ASTM E662-83 fulfilled
ABD 0031 fulfilled
BSS 7238 / 7239 fulfilled
FMVSS 302 fulfilled
BS 476, part 6/7 class 0
CNS 6532 (Taiwan) fulfilled
The given values are guidlines only based on screening tests.
Physical properties of Basotect®
Basotect 基本物性
Toxic Smoke Test
In general, it discharge
toxic smoke while Temp.
arrive to 250℃ (482℉).
“Basotect” withstand to
350℃(662℉)
29/06/2008 INTERNAL 5
Sound absorption of Basotect®
DIN 52 215 吸音測試
frequency in Hz
sound absorption coeff. in %
t = 60 mm
0
20
40
60
80
100
120
125 200 315 500 800 1250 2000 3150
t = 20 mm
t = 40 mm
29/06/2008 INTERNAL 6
Sound absorption of Basotect®
DIN 52 212 吸音測試
frequency in Hz
sound absorption coeff. in %
0
20
40
60
80
100
125 200 315 500 800 1250 2000 3150
t = 30 mm
t = 10 mm
t = 50 mm
t = 100 mm
29/06/2008 INTERNAL 7
Sound absorption of Basotect® (Plate vs Pyramid)
ASTM E1050-90 / Test By Industrial Technology Research
Institute
-0.1
0.1
0.3
0.5
0.7
0.9
1.1
126 160 200 250 315 400 500 630 800 1000 1250 1600 2000 2500 3150 4000
頻率Hz
正向
入射
吸音
率
30mm
P30mm40mm
P40mm50mm
P50mm80mm
29/06/2008 INTERNAL 8
Physical properties of Basotect®
Basotect
thermal conductivity
10C < 0,035 W/mK DIN 52612
50F < 0,24 Btu in/hft² °F
0.0296 kcal/m.hr.°C (3cm) CNS 7333 0.0306
kcal/m.hr.°C (4cm) CNS 7333 0.0323
kcal/m.hr.°C (5cm) CNS 7333
flammability
B1 : DIN 4102 / class 0 : BS 476, part 6/7
M1 : NF P 92-501 / 94 V-0 : UL 94
ok : Boeing BSS 7238/39
(e.g. with Calcium silicate board All Pass CNS-6532 Bears burns Third-
level)
temperature at permanent use
150 °C [300 °F]
3-2 Acoustic Performance
3-2.1 Designs Anticipated:
A. Sound Insulation Ability ≧ 40dB(A)
B. Internal Noise(when outside noise≦ 70dB(A) ≦20dB(A)
C. 3KHz to 20KHz Cut off High Frequency ≦ 10dB SPL ref.20uPa
D. Wedge Sound Absorption cut off frequency ≦ 1.7KHz
E. Floating Nature Frequency ≦ 15Hz
F. RF Shielding Ability for Bluetooth 2.4GHz ≧ 30dBm
3-2.2 Test Results:
A. Chamber Inside Noise 19.87dB(A-Weighting) FFT & LEQA Mode.
(Office Noise 60~70dBA Condition)
B. Sound Insulation Ability > 40dBA
Sends out the stable Pink Noise ~ 80dBA
Internal Noise ~38.92dBA (Closed door)
3-2.3 Verify with a list of Equipments:
1. IEA EA2 : Electro-Acoustic Integrated System.(CLIOQC Version 10.03)
2. B&K 4231: Sound Level Calibrator.
3. B&K 5935: Microphone Power Supply
4. B&K 4190: 1/2 inch Free Field Microphone System
5. TANNOY 800 : Coaxial Source Reference Loudspeaker