Impedance Tube Solutions-ASTM&ISO


BSWA Company Introduction

Established in 1998, BSWA Technology Co., Ltd. is becoming the preferred supplier for acoustical measurements. With headquarter located in Beijing, BSWA currently employs 100 staffs with branch offices in Shanghai, Guangzhou, and Chengdu. BSWA’s products are distributed in over 40 countries through our sales partners.
BSWA Products cover a full range of acoustic measurement devices. The products are sorted into easy-to-follow sections:

    · Microphones
    · Sound level meter
    · Measuring systems
    · Material testing
    · Audio testing
    · Outdoor monitoring systems
    · Sound sources

    · Cable and accessories

Impedance Tubes
BSWA SW series Impedance Tubes can accurately measure sound absorption coefficients and impedance according to relative ISO and ASTM standards. They also support the sound transmission loss measurements based on the Transfer Function Method. The Transfer Function Method separates the incident and reflected energy from the measured transfer function, and then estimates the acoustic properties of the tested
sample installed in the tube.
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 be transported and used for estimating the properties of walls, ceilings, installed building materials, road surfaces, different ground surfaces, interiors of vehicles, and etc. BSWA offers the complete set of Impedance Tube system, which
includes: the tubes, microphones; DAQ hardware and measurement software.
BSWA 1/4’’ microphones MPA416, 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. PA50 power amplifier is used to drive the loud speaker in the impedance tube. The BSWA VA-Lab software provides all measurement functions for sound absorption and transmission loss testing.


Material Testing System

BSWA VA-Lab software has the Impedance Tube Module (VALab IMP) which supports sound absorption and sound insulation measurement for BSWA SW series impedance tubes. The software works with BSWA MC3022, MC3522, MC3242 and MC3642 hardware for data acquisition and analysis. The VA-Lab IMP supports two methods to measure the absorption coefficients of material:
· Method using Standing Wave Ratio (ISO10534-1)
· Transfer Function Method (ISO10534-2, ASTM E1050-08, and ASTM E2611-09)
The VA-Lab IMP also supports four microphones method for sound transmission loss measurements

Data Combination Interface

Typical Complete Setup for Measurement of Sound Absorption and Transmission Loss (Frequency Range: 63 Hz ~6300 Hz)