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Versatile system for operational benchmarking and sound evaluation -
The LMS Test.Lab 16 Channel Sound Diagnostics system provides a flexible solution for operational testing and psycho-acoustic sound evaluation in a variety of test environments, including road, test track and roller bench. High bandwidth time data is acquired, yielding a comprehensive set of sound metrics, on-line or off-line. The data acquisition is performed using a portable LMS SCADAS 305 front-end with two embedded tacho inputs, supporting 16 channels for ICP® and Voltage signals, of which four channels accept polarization microphones.

The Signature Throughput workbook writes the time histories for all channels directly to the PC hard disc. The resulting TDF-data files contain all dynamic and static channels, rpm-time traces for all tacho channels and overload information for each channel. The many online processing and visualization formats include waterfalls and order-, frequency- and octave sections. The data acquisition can be controlled remotely through a push-button box and enlarged status displays facilitate monitoring during measurement. The time data can be validated immediately after the measurement, allowing the engineer to gain a quick overview on the whole measurement or to zoom in on details.

The Sound Diagnosis workbook allows the engineer to evaluate the human perception of the recorded sound through a large range of global and tracked psycho-acoustic metrics on user defined segments of the recorded time histories. After spectral analysis, the main origin of the sound characteristics can be diagnosed starting from any type of display. While listening, an unlimited number of filters can be applied interactively. Data from different measurement runs can be organized and combined for batch processing. The selection and processing parameters from any interactive sound diagnosis session can be saved as template procedure to speed-up future analysis.

Features & Benefits

• Online monitoring of spectra, waterfalls and colour maps, octave displays and order sections, and a variety of measurement status indicators (ADC levels, rpm readouts, rpm time traces, rpm levels)

• Large range of online and offline global and tracked sound metrics

• Flexible segment selection for detailed analysis

• Built-in polarization microphone power supply and signal conditioning

• Quick and easy tabular reporting of sound metrics in MS-Office

• Ensures effective and reliable operational benchmarking for sound qualification

• Allows on the spot psycho-acoustic sound evaluation during mobile data recording

• Fast and productive in-depth Sound Diagnosis through interactive filtering

• Quick standard tabular reporting with “single button” operation