F100/F50 Square Impedance Tube
F100/F50 square impedance tube is designed base on transfer-function method, according to GB/T 18696.2, GB/J 88, ISO 10534-2, ASTM E1050-12, and ASTM E2611-17 standards, including absorption tube kit and transmission loss tube kit.
The absorption tube kit of F100/F50 is based on two-microphone transfer-function method. The normal incidence sound absorption coefficients and specific acoustic impedance ratios of materials in the full measurement frequency range can be obtained only by one test. Compared with the tube designed based on the standing wave ratio method, it significantly improves the test efficiency of material acoustic properties. And the transmission loss tube kit is based on four-microphone transfer-function method. The transmission loss of materials to be measured can be obtained by measuring the sound pressure level at four fixed positions in tube with two different terminations and calculating a complex transfer function.
The inner side length of F100 impedance tube is 102 mm, test frequency range is 45 Hz ~ 1.6kHz. The inner side length of F50 impedance tube is 50mm, test frequency range is 800 Hz ~ 3.55 kHz. Made of hard aluminum alloy, with compact design, light weight and easy to assemble, which is convenient for measuring acoustic properties of materials at various places.
Features:
⚫ Acoustical properties of material measurements based on the transfer-function method according to not only absorption coefficient standard of GB/T 18696.2, GB/J 88, ISO 10534-2 and ASTM E1050-12, but also transmission loss standard of ASTM E2611–17
⚫ Separable sample holder tube is convenient for placement of materials to be test
⚫ Faster and more accurate compared to the standing wave ratio method
⚫ Frequency range can cover high and low bands, depends on various diameter of tube and the different microphone spacing
⚫ Improved sealing and connecting structures between tubes are convenient for measurement and has much better sealing and sound insulation performance
Applications:
⚫ Quantitative measurement of acoustic properties of materials
⚫ Measure the acoustic coefficients of materials which required for simulation software
Impedance Tube：
|
Type |
Absorption Tube |
Transmission Loss Tube |
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|
F100 |
F50 |
F100 |
F50 |
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|
Standard |
GB/T 18696.2、GB/J 88、ISO 10534-2、ASTM E1050-12 |
ASTM E2611-17 |
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|
Frequency Range |
45 Hz~1.6 kHz |
800 Hz~3.55 kHz |
45 Hz~1.6 kHz |
800 Hz~3.55 kHz |
|
Side Length |
102 mm |
50 mm |
102 mm |
50 mm |
|
Length of Tube1 |
828 mm |
703 mm |
1288 mm |
1074 mm |
|
Zero Absorption |
45 Hz ~ 4 kHz: <5 % (Calculated in 1/3-octave band) |
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Note 1: The length is the minimum combination state. |
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Loudspeaker
|
Rated Impedance |
4 Ω |
|
Diameter |
3.5-inch |
|
Sensitivity |
89.8 dB （2.83 V@1 m） |
|
Rated Power |
10 W (continuous) |
|
Peak Power |
30 W (short duration: duty cycle 1/3, on time 50 s) |
|
Audio Interface |
Banana socket |
Measurement Microphone
|
Type |
MPA416 Prepolarization Microphone |
|
Diameter |
1/4” |
|
Sensitivity (±2 dB) |
50 mV/Pa（-26 re 1 V/Pa） |
|
Output Impedance |
< 110 Ω |
|
Dynamic Range |
29 dBA~127 dB |
|
Self-generated Noise |
29 dBA |
|
Power Supply |
ICCP |
Download information:
F100/F50 Square Impedance Tube
