System for determination of materials impedance in impedance tubes is used for evaluation of material’s acoustic properties.
The system meets the requirements of applicable standard ISO 10534-2:1998 «Acoustics – Determination of sound absorption coefficient and impedance in impedance tubes – Part 2: Transfer-function method».
The specimen is placed inside of a solid, leak-proof, smooth impedance tube. The noise source generates broadband noise, then the sound pressure is measured at two points near the tested specimen. The transfer function calculated based on data from the two microphones is used for calculation of the required values.
FFT spectrum analyzer ZET 017-U4 is used for generation of the broadband noise and processing of signals received from the microphones. The noise generated by FFT spectrum analyzer is produced by the dynamic placed inside of the impedance tube. Two microphones inside of the impedance tube are used for acoustic pressure measurements.
Frequency range depends on tube diameter and the distance between the microphones. It is also possible to achieve an extended frequency range by performing a number of tests with various diameters and distances.
Prior to measurements performance, it is necessary to calibrate the system so that to reduce the difference between characteristics of the microphones (i.e., amplitude, phase).
minimum space required
minimum interference impact on measurements results
software enables automated parameters calculation
certified instruments used within the scope of the system
| Basic configuration | |||
|---|---|---|---|
| Item | Function | Amount | Price USD |
| FFT spectrum analyzer ZET 017-U4 | controller for processing of the signals received from primary transducers | 1 pc | 7896 |
| SW422+SW477 | accurate measurement of sound absorption corfficient | 1 pc | from 16584 |
| Amplifier PA50 | control of the sound pressure produced | 1 pc | from 1129 |
| Microphones MPA 416 | sound pressure measurement | 2 pcs | from 625 |
| Calibrator CA115 | microphones calibration | 1 pc | from 507 |
| Software “Impedance measurement system” | SCADA-project for material’s acoustic properties evaluation in automated mode | 1 pc | 2889 |
| SCADA system ZETVIEW | necessary option for operation of SCADA-project | 1 pc | 349 |
| Accessories: Cable CBB005 Cable CBS055 Cable CAA002 |
for connection of PA50 to ZET 017 for connection of MPA416 to ZET 017 for connection of PA50 to the speaker |
1 pc 2 pcs 1 pc |
41 80 35 |
POR (price on request)
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