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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 |
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Hardware System for Measurement |
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Duct for measurement |
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Frequency range |
Name of duct |
Dia(mm) |
Length(mm) |
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Measuring at low frequency range |
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] |
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 & Amplifier |
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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 |
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Microphone |
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Diameter |
1/4 [inch] |
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Frequency range |
20Hz - 15kHz : ¡¾3dB |
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Sensitivity |
50mV/Pa ¡¾ 5% |
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Max SPL |
124dB |
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Temperature range |
-10 ~ 50 ¡ÆC |
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Output socket |
BNC jack |
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Noise |
lin (20Hz ~ 20kHz) < 100§Å |
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Data acquisition unit |
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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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Unit for calibration |
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Testing sample for calibraton |
Low frequency & High frequency |
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Dummy microphones |
4EA |
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Others units |
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BNC calble |
(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 |
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System for measuring density and size of material |
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Software for Measurement |
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Real time data analysis |
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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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