SW Series
SW Series Impedance Tubes
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SW series Impedance Tubes can accurately measure sound absorption coefficients and impedance according to standards described in ISO10534-2 (1998). They are based on the Transfer Function Method, which is much faster than the commonly used Standing Wave Ratio Method.
The SW series Impedance Tubes are specially designed not only to work with the cut samples, but also for direct use in the field. The small size and durable aluminum construction make it easy to transport and be used for estimating the properties of walls, ceilings, installed building materials, road surfaces, different ground surfaces, interiors of vehicles, etc. BSWA offers the complete set of Impedance Tube system, which includes:
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Microphones
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BSWA 1/4’’ MPA416 microphones , which have excellent phase matches, are ideal for impedance applications. The microphones are directly connected to optional 2-channel MC3522 or 4-channel MC3242 data acquisition hardware using BNC-to-SMB cables.
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Data Acquisition Hardware/ Loudspeaker Amplifiers
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The impedance tube systems are designed to be used with a 2-channel MC3522 or a 4-channel MC3242 data acquisition hardware cards.
The 2-channel MC3522 is ideal for absorption measurement systems where only two microphones are necessary. The MC3522 has a built in amplifier used to power the loudspeakers of the test tubes.
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The 4-channel MC3242 is required for transmission loss measurements where 4 microphones are necessary. Unlike the MC3522, the MC3242 does not contain a built-in amplifier. As a result, a dedicated PA50 power amplifier is used to drive the loud speaker in the impedance tube.
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Impedance Tube Models
Model |
Measurement Capability |
Frequency Range (Hz) |
Tube Diameter |
No of Microphones (MPA416) |
DAQ Hardware |
Speaker Amplifier |
Microphone Calibrator, Cables, Case |
Software |
SW470 |
Absorption |
1000-6100 |
30mm |
2 |
2-Channel MC3522 |
Built in with MC3522 |
Included |
VA-LAB2 |
SW230 |
Absorption |
125-3000 |
60mm |
2 |
2-Channel MC3522 |
Built in with MC3522 |
Included |
VA-LAB2 |
SW260 |
Absorption |
125-6100 |
30mm and 60mm |
2 |
2-Channel MC3522 |
Built in with MC3522 |
Included |
VA-LAB2 |
SW420 |
Absorption |
63-1600 |
100mm |
2 |
2-Channel MC3522 |
Built in with MC3522 |
Included |
VA-LAB2 |
SW477 |
Absorption and Transmission Loss |
1000-6100 |
30mm |
4 |
4-Channel MC3242 |
PA50 |
Included |
VA-LAB2 |
SW433 |
Absorption and Transmission Loss |
125-3000 |
60mm |
4 |
4-Channel MC3242 |
PA50 |
Included |
VA-LAB2 |
SW466 |
Absorption and Transmission Loss |
125-6100 |
30mm and 60mm |
4 |
4-Channel MC3242 |
PA50 |
Included |
VA-LAB2 |
SW422 |
Absorption and Transmission Loss |
63-1600 |
100mm |
4 |
4-Channel MC3242 |
PA50 |
Included |
VA-LAB2 |
SW422 and SW477 |
Absorption and Transmission Loss |
50-6100 |
30mm and 100mm |
4 |
4-Channel MC3242 |
PA50 |
Included |
VA-LAB2 |
Measurement Capabilities
The VA-Lab IMP supports two methods to measure the absorption coefficients of material:
The Standing Wave Ratio Impedance tube method is a classic method for measuring acoustic characteristics of materials. Please contact us for more information if interested in such a system.
- Method using Standing Wave Ratio (ISO10534-1)
- Transfer Function Method (ISO10534-2, ASTM E1050, and ASTM E2611)
The Standing Wave Ratio Impedance tube method is a classic method for measuring acoustic characteristics of materials. Please contact us for more information if interested in such a system.
Software
BSWA VA-Lab software includes the Impedance Tube Module (VALab IMP) which supports sound absorption and sound transmission measurement for BSWA SW series impedance tubes. The software works with BSWA MC3022, MC3522, MC3242 and MC3642 hardware for data acquisition and analysis.
The software's ease of use allows the user to quickly choose between absorption and transmission loss measurement.
All necessary parameters such as sample thickness and environmental conditions can be entered wihin a single window.
Results from multiple tube dimensions can be combined to provide seamless results in a single frequency range.
Reports can be quickly generated and exported into Excel using VA-LAB's report generator.
The software's ease of use allows the user to quickly choose between absorption and transmission loss measurement.
All necessary parameters such as sample thickness and environmental conditions can be entered wihin a single window.
Results from multiple tube dimensions can be combined to provide seamless results in a single frequency range.
Reports can be quickly generated and exported into Excel using VA-LAB's report generator.
- Absorption Measurement Set-Up Screen Image
- Transmission Loss Measurement Set-Up Screen Image
- Absorption Results Screen Image
- Combined Results Screen Image
- Report Generator Window Image
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