Standards-Compliant Acoustic Measurements

• Sound power and sound pressure level measurements

• Full compliance with ISO 3741 and ISO 3744

• Automatic background noise compensation (K1, K2 parameters)

High-Performance Data Acquisition

• Support for cDAQ multichannel systems with NI Series C modules

• Support for advanced PXI multichannel systems

• Simultaneous sampling on all channels

• Sampling rate up to 102.4 kS/s per channel

• 24-bit A/D converters with dynamic range > 110 dB

Multi-Sensor Support

• Microphones

• Accelerometers

• Thermocouples and Pt100 sensors

• 4–20 mA signals (flow, pressure, etc.)

• Tachometers

• Voltage and current transducers

Flexible System Configuration

• Typical configuration with 8 or more microphone channels

• Programmable anti-aliasing filters

• Digital I/O channels for test automation and synchronization

• Additional synchronous channels for electrical and operational parameters of the DUT

Advanced Setup and Calibration

• Definition of transducer characteristics and acquisition parameters

• DUT parameter configuration

• Automatic microphone calibration using certified sound pressure calibrators

• Optional A-weighting filter on microphone channels

• Measurement chamber parameter setup (volume, barometric pressure, measurement surface)

Reverberation Time (T60)

• Indirect T60 measurement using the inverse method with certified sound sources

• Direct T60 measurement via automatic excitation signal generation and decay analysis

Signal Processing and Analysis

• Real-time and post-processing operation modes

• Overall sound power and sound pressure level calculation

• Time-equivalent sound level computation

• Time-trend visualization of calculated parameters

• FFT analysis in fine bands and one-third octave bands

• Instantaneous and averaged spectral analysis

Data Recording and Post-Processing

• Processed data logging during acquisition

• Raw data recording for offline analysis and playback

• Compatibility with NVA Post Pro advanced processing modules

• Manual and delayed recording modes

• Configurable start/stop times for unattended measurements

Advanced Utilities

• Automatic or manual selection of signal segments based on level triggers

• Cycle-based averaging (commonly used for appliances such as refrigerators and freezers)

• Tools for trimming recordings and extracting relevant signal portions for advanced analysis

• Automatic test report generation

• Export of results in tabular formats

• Integrated database management for easy retrieval and review of previous tests

Acoustic Certification Testing

• Sound power measurement in reverberant and semi-anechoic chambers

• Compliance testing according to international standards

Household Appliances

• Noise analysis of refrigerators, freezers, and similar cyclic DUTs

• Cycle-based averaging and unattended test execution

Industrial Products and Machinery

• Acoustic characterization of machines, equipment, and components

• Correlation of acoustic data with operational and electrical parameters

Research and Development

• Product noise optimization

• Comparative testing during design and validation phases