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.
