Impedance tube system for pavements absorption test SW420R

Overview of Impedance tube system for pavements absorption test SW420R

ISO 13472-2: 2010 specifies a test method for measuring in situ the sound absorption coefficient of road surfaces with impedance tube. This method enables evaluation of such characteristics without damaging the surface. SW420R is designed according to ISO 134722, and the performance satisfies the requirement of ISO 13472. The test results can the absorption characteristics of road surface for vehicle, tyre testing and other traffic noise studies. However, the field of application is limited to low absorption surfaces, such accordance with ISO 18044. The method is not reliable if the measured sound absorption coefficient exceeds 0.15. The use of SW420R is the same as description in ISO 10534, VA-Lab IMP module can be used with SW420R.

• Specially designed for measurement of sound absorption
• Properties of road surfaces.
• Integrated design, portable and stable.
• Selected sealing material, reducing the leak of sound signal.


Standards: ISO13472-2:2010, ISO10534-2:1998, GB/T 18696.2-2002

Frequency Range: 250 –1600 Hz (1/3 Octave) / 220 –1800 Hz

Inner Diameter: 100 mm

Length of tube: 680 mm (including handle)

Microphones: ¼” ICCP MPA416

Microphones Spacing: 80 mm

Height of microphone to ground: 150 mm

Totally reflective specimen: Rounded steel plate of 10 mm thickness, Diameter : 185 mm

Weight: 14 kg

Package size: 74 x 36 x 41 (H) cm