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: the tubes, microphones; DAQ hardware and measurement software.

Technical Parameters:
Value to be Measured

Sound Absorption Coeff cient (α) and Transmission Loss (TL)

Standard Sound Absorption Standard: GB/T-18696, 2-2002, ISO10534-2, 1998; 

ASTM E1050-08; ASTM E2611-09

Frequency Range (Hz) 63 ~ 1800Hz
1/4’’ Microphone MPA416
Loud speaker 4 “ in diameter, 20 Watts, 8 Ohm
Inner Diameter of Testing Tube 100 mm
Data Acquisition Card MC3242
Power Amplifier PA50
Software VA-Lab4 Basic + VA-Lab4 IMP-AT

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