Time data recording

Time data can be acquired from OROS hardware (using a simple driver allowing to define the project, machine, measurement points, and operating condition at the time of recording), or other selected data acquisition devices and stored in a data base for later use. Very long time blocks can be processed (several seconds of data at 20kHz). Data can also be imported from VIBREXPERT or any WAV file. Several discriminants (Peak, RMS, Kurtosis values) are calculated. The signal can then be edited, decimated or digitally filtered in order to cover a different frequency range, enveloped or simply re-sampled using various algorithms. The processed time signals can be played-back on the PC sound system or used for further post-processing. A built-in signal generator is included for tutorial purpose.

AD-LIB can perform a three-pass FFT analysis (for example, 0-20k, 0-2k and 0-200 Hz) on a time waveform to generate a Constant Percentage Bandwidth analysis (4%, 6%, 8%, 12%, 1/3rd octave and Octave). For each FFT analysis, it is possible to specify the number of lines (only limited by the amount of time samples), the full scale frequency, and some preconditioning like a high-pass or bandpass enveloping filter. The highest peaks in each spectrum are automatically identified and a table containing the acceleration, velocity and displacement levels together with the frequency (interpolation between the lines is used for maximum accuracy) is generated. Many different analysis set-ups can be pre-defined and used later for batch processing on a large number of signals. Once a CPB spectrum is generated, it can be stored and used later for comparison and trending. A 3-D diagram showing the evolution of the CPB data (or its difference with a comparison spectrum) can also be displayed.