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Impedance Tube

Impedance Tube can accurately measure sound absorption coefficients and impedance according to both 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.

ROGA offers the complete set of Impedance Tube system, which includes: the tubes, microphones; DAQ hardware and measurement software.

Complete Impedance Tube System

60 Hz – 6300 Hz

Impedance Tube

Features:

  • Acoustical properties of material measurements based on the transfer-function method according to absorption coefficient standard of GB/T 18696.2, GB/J 88, ISO 10534-2 and ASTM E1050-12, and 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

setup of the impedance tube

measuring chain calibration

sound absorption measurement

Conforms to the following standards:

ISO 10534-1: 1996 Acoustics-Determination of sound absorption coefficient and impedance in impedance tubes-Part 1: Method using standing wave ratio.

ISO 10534-2: 1998 Acoustics-determination of sound absorption coefficient and impedance in impedance tubes-Part 2: Transfer function method.

E 1050-08 Standard test method for impedance and absorption of acoustic materials using a tube, two microphones and digital frequency analysis.

E 2611-09 Standard test method for measuring sound transmission at normal incidence of acoustic materials based on the transmission matrix method.

The transmission loss is based on the transfer function method with four microphones, and the ISO standard.
The impedance tube system was developed on BSWA’s digital acquisition hardware with LabVIEW development platform.

ROGA 1/4’’ microphones MI19, which have excellent phase matches, are ideal for impedance applications.

The microphones are directly connected to optional 2-channel Plug.n.DAQ Lite or 4-channel MC3242 data acquisition hardware.

PA50 power amplifier is used to drive the loud speaker in the impedance tube.

The VA-Lab software provides all measurement functions for sound absorption and transmission loss testing.

Model
Impedance Tube Kit
60 Hz – 6300 Hz
Price
ROGA Instruments products are free from planned obsolescence, technically accessible, durable and repairable.

Sound Absorption Coefficient (α) and Transmission Loss (TL) Sound Absorption Standard: GB/T-18696, 2-2002, ISO10534-2, 1998; ASTM E1050-08 ASTM E2611-09
SW422 + SW477
Set
For accurate measurement of sound absorption coefficients (63-6300Hz) and transmission loss(60-6300Hz), includes:
– a 100mm diameter tube
– a 100mm diameter sample holder
– a 100mm diameter extension tube
– a 30mm diameter tube
– a 30mm diameter sample holder
– a 30mm diameter extension tube
Including
PA50; Power Amplifier of 50W
MC3242; DAQ card with 4 IEPE input channels and 2 signal output channels, USB power supply, 0-20kHz, connected with laptop.
4* MI19; 1/4″ microphone with IEPE Preamp, BNC
CA114; 1000Hz, 94dB sound calibrator, Type 2, with adaptor for 1/2” and 1/4” microphones
30 mm and 100 mm sample cutter
VA-Lab4 BASIC; Base software for measurement of noise and vibration, used for 4 channels
VA-Lab4 IMP-A; Software for measurement of material impedance values (4 mics are needed), for measurement of Transfer Function and the calculation of sound impedance coefficients and sound impedance.

Including Mini-PC
Including Sample Cutting Machine


41800 €
Model
Impedance tube prices without accessories
Price
ROGA Instruments products are free from planned obsolescence, technically accessible, durable and repairable.
SW420

For accurate measurement of sound absorption coefficient
(63-1800Hz), 100mm inner diameter.
Tube with 100mm diameter
100mm diameter sample holder

7150 €
SW470

For accurate measurement of sound absorption coefficient
(1800 Hz- 6300 Hz) 30mm inner diameter.
Tube with 30mm diameter
30mm diameter sample holder

6060 €
SW422

For accurate measurement of sound absorption coefficient
(50-1800Hz) and material impedance values(63-1800Hz)100mm inner diameter.
– 100mm diameter tube
-Sample holder with 100mm diameter
-100mm diameter extension tube

8130 €
SW433

For accurate measurement of sound absorption coefficients
(125-3150Hz) and material impedance values (125-3150Hz)
60mm inner diameter, includes:
– a 60mm diameter tube
– a 60mm diameter sample holder
– a 60mm diameter extension tube

8130 €
SW477

For accurate measurement of sound absorption coefficient
(1600-6300 Hz) and material impedance values(1600-6300 Hz) 30mm inner diameter.
– 30mm diameter tube
– Sample holder with 30mm diameter
– 30mm diameter extension tube

6920 €

Previous pricing and price lists are no longer valid. 

Prices and conditions are subject to change without notice.

All prices are without current VAT. 

Terms of payment in advance.

Our group only accept 100% T/T before shipping.

ROGA Instruments only offers its products for direct sale to end customers.