Standards:

Applications:

Product Information:

The Transfer Function Sound Absorption Coefficient and Sound Insulation Measurement System consists of the AHAI2022 Dynamic Signal Analyzer, AHAI2060/AHAI2061 Impedance Tubes, the AHAI5401 Microphone Array, the analysis host, and the analysis software. It complies with the standards GB/T 18696.2-2002 and ISO 10534-2:1998. Compared with the traditional standing wave ratio method, the system offers higher testing efficiency, enabling one-time measurement of the sound absorption coefficient and sound insulation over the entire frequency range, with the capability to save both measurements and curves. It can automatically measure the sound absorption coefficient, acoustic impedance, reflection coefficient, acoustic admittance, and sound insulation over the entire test frequency range, making it suitable for laboratory and on-site material testing.

Standards

GB/T 18696.2-2002 Acoustics — Measurement of Sound Absorption Coefficient and Acoustic Impedance in Impedance Tubes — Part 2: Transfer Function Method

ISO 10534-2:1998 Acoustics — Determination of Sound Absorption Coefficient and Impedance in Impedance Tubes — Part 2: Transfer Function Method

JJF 1446-2014 Calibration Specification for Impedance Tubes

ASTM E2611-09 Standard Test Method for Normal Incidence Acoustic Transmission of Materials Using the Transfer Matrix Method

Performance Specifications

1. System Standards:

The system shall comply with the standard: GB/T 18696.2-2002 (ISO 10534-2:1998) “Acoustics — Measurement of Sound Absorption Coefficient and Acoustic Impedance in Impedance Tubes — Part 2: Transfer Function Method.”

2. System Composition:

The system consists of a four-channel dynamic signal analyzer, impedance tube, sound insulation tube, 1/4-inch microphone array (4 units), and a complete set of analysis software.

3.Main Performance Indicators:

Measurement Instrument Requirements:

Input channels: 4

Input signal type: Voltage or ICP

AD resolution: 24-bit

Dynamic range: >110 dB

Channel consistency: Amplitude <0.1 dB, Phase <0.1°

Instrument noise: 3 μV

Maximum sampling frequency: 384 kHz

Measurement capabilities: Sound absorption coefficient, sound reflection factor, acoustic impedance, acoustic admittance, transfer function, sound transmission coefficient and sound insulation, characteristic impedance

Automatic correction of amplitude and phase for the microphone array

Sample dimensions (mm): 100 × 29

Zero absorption: <10%

Acquisition device thickness: <35 mm

Sound source frequency response equalizer: 100 Hz–6.3 kHz ±1 dB

1/4-Inch Microphone Array:

Sensor sensitivity: 4 mV/Pa

Sensor sensitivity difference: <1 dB

Sensor capacitance: 6.5 pF

Sensor frequency range: 20 Hz to 20 kHz

Phase difference: <0.3° below 800 Hz; above 800 Hz < f × 0.0005°

Software:

CPB Analysis Software

FFT Analysis Software

Transfer Function Method Sound Absorption and Insulation Measurement Software