Nor1527 impedance tube with all accessories

Test systems

Nor1527

Impedance tube

Material Sound Transmission Loss and Acoustic Impedance Tube Systems

The Nor1527 acoustic performance measurement system provides acoustic impedance, sound transmission loss, and sound absorption coefficient measurements in accordance with ASTM E2611, ASTM E1050, and ISO 10534‑2. Measurements are performed under room conditions (temperature and pressure) over the frequency range 50 Hz to 6400 Hz

There are two tubes of differing diameters (100 mm and 30 mm), designed for low- and high-frequency measurements respectively.

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Sound Absorption Coefficient

The sound absorption coefficient of acoustic materials can be determined in accordance with the standard ISO 10534-2, “Acoustics – Determination of acoustic properties in impedance tubes – Part 2: Transfer-function method using two microphones for sound absorption coefficient and surface impedance under normal incidence.” Depending on the diameter of the tube used, measurements can be carried out in the ranges of 50–1600 Hz or 200–6400 Hz. The measurements are performed by generating a stochastic acoustic excitation (noise) with the sound source and capturing the sound components reflected by the material.

Transmission Loss

In a four-microphone configuration, the transmission loss of acoustic materials can be measured in accordance with the standard ASTM E2611, “Measurement of Normal Incidence Sound Transmission of Acoustical Materials Based on the Transfer Matrix.” Depending on the tube configuration used, measurements can be carried out in the ranges of 50–1600 Hz or 200–6400 Hz. The measurement is performed by generating a stochastic acoustic excitation (noise) with the sound source and capturing both the reflected and transmitted sound energy at the material.

Features

Software features

System components

Downloads

Features

ASTM E2611 (4 Pole Transfer Matrix Method) measurement method.
ASTM E1050 and ISO 10534-2 (Transfer Function Method) measurement method.
High-frequency range, 50 - 6400 Hz (100 mm and 30 mm tubes).
State-of-the-art manufacturing
Industry-leading sensors and analysers.
Acoustic leakage-proof construction.
One day free online training included.

Software features

Determination of sound barrier properties (sound transmission loss, characteristic impedance, characteristic wave number.
Determination of sound barrier properties (sound transmission loss, characteristic impedance, characteristic wave number)Determination of sound absorbing properties (sound absorption coefficient, complex reflection coefficient, surface impedance).
Determination of transfer matrix elements.
Random incidence absorption estimation models.
Tube attenuation removal algorithm for deficient absorptive materials.
Conical adapter correction for transmission loss measurements.
Determination of intrinsic properties with Johnson-Champoux-Allard-Lafarge (JCAL) material model.(Porosity, Flow Resistivity, Tortuosity, Viscous Characteristic Length, Thermal Characteristic Length, Static Thermal Permeability)
Amplitude and phase calibration of the microphones.
Selectable frequency resolution and number of averages.
Direct export to MSC Actran for poro-elastic materials definition.

System components

Analyser:
102.4 kS/s, 100 dB, 0.8 Hz AC/DC Coupled, 4-Input/1-Output

Microphones:
GRAS Measurement Microphones
Freq range: 10 Hz to 20 kHz
Dyn range: 33 dB(A) to 142 dB
Sensitivity: 9 mV/Pa

Tubes:
F-ABS ⌀ 100 mm, 945 mm (L)
LF-STL ⌀ 100 mm, 1130 mm (L)
HF-ABS ⌀ 30mm, 875 mm (L)
HF-STL ⌀ 30 mm, 925 mm (L)

Power Amplifier:
Built-in, 20W, high quality amplifier, to power the loudspeaker in the impedance tube

Speaker:
Full Range – 4 ohm

Calibrator (Optional):
Nor1256 Sound Calibrator

Cables:
Ultra low noise, BNC to 10-32 cables