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 흡차음
분석기 관내법
분석기(Acoustic Duct )
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Specifications for Acoustic Duct
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Computer |
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Processor |
900 MHz or
higher |
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Co-processor |
Compulsory |
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RAM |
128MB or
higher |
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VGA
card |
32M or
higher |
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Operating
system |
Windows 98 or
NT |
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Printer |
HP
deskjet |
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Unit for
display |
19" color
monitor |
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Hard
disk |
20GB (highly speed accesstime) |
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Hardware System for
Measurement
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Frequency
range |
Name of
duct |
Dia(mm) |
Length(mm) |
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Measuring at low
frequency range [100Hz ~ 1600Hz] |
Signal generating
1EA |
102.5 |
640 |
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Fixing insulation material
2EA |
108 |
20, 30, 50,
100 |
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Calibrating
1EA |
102.5 |
400 |
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Fixing absorption material
2EA |
102.5 |
50, 100 |
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Measuring at high
frequency range [500Hz ~
6300Hz]
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Signal generating
1EA |
30 |
320 |
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Fixing insulation material
2EA |
35 |
20, 30, 50, 100 |
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Calibrating
1EA |
30 |
15 |
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Fixing absorption material
2EA |
30 |
50, 100 |
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Power
supply |
Signal output CH
1EA
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Signal input CH
4EA |
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DC coupling 12V &
0.1A |
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Amplifier |
Amplification of current 20dB
& 40dB |
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Diameter |
1/4 [inch] |
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Frequency
range |
20Hz - 15kHz : ±3dB
100Hz - 10kHz
: ±1dB |
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Sensitivity |
50mV/Pa ± 5% |
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Max
SPL |
124dB |
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Temperature
range |
-10 ~ 50 °C |
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Output socket
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BNC jack |
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Noise |
lin (20Hz ~ 20kHz) < 100㎶
, A -
weighted < 30㎶ |
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Sampling
rate |
300k / total & 75k /
Channel |
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Resolution |
16bit |
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Gain
control |
Control by Programming
(1/10/100/1000) |
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Signal input
type |
Signal ended (Must be installed on
earth) |
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A/D &
D/A |
16 Channel & 2
Channel |
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Calibration |
Self -
Calibration |
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Testing sample for
calibraton |
Low frequency & High
frequency |
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Dummy
microphones |
4EA |
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BNC calble
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(2.5m 2set & 1.5m
1set) |
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Signal
generator |
sine wave, swept sine wave,
white-noise, pink-noise...etc |
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Speaker
2ea |
For low frequency & high frequency
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Environmental
System |
measuring system of temperature &
humidity |
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System for cutting of
material |
Main system & cutting
blade |
Software for
Measurement
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FFT
module |
Time data => Freq
data |
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FRF
module |
Data for
calibration |
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Auto-spectrum |
Averaged freq
data |
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Cross-spectrum |
Data included with amplitude &
phase |
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Frequency response
function |
Data for
calibration |
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Input data display
module |
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Auto-spectrum |
2 channel & 4
channel |
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Cross-spectrum |
Real &
imaginary |
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Result data display
module |
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Absorption
ratio |
0.0 ∼ 1.0 (default range) contorolled
by user |
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Transmission
loss |
0dB ∼ 60dB (default range) contorolled
by user |
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Normalized
impedance |
Real &
imaginary |
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Frequency response
function |
Amplitude &
phase |
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Indexed of performance
of material |
Absorption
coefficient |
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Calibration
module |
Axis display
module |
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Absorption
coefficient |
1/1, 1/3.....1/n Octave
band |
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Transmission
loss |
Narrow band |
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Normalized
impedance |
Linear scale |
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Reflection
coefficient |
Log scale |
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