The Rotate2.5 Waterfall calculation - the fastest in the industry - uses standard Fast Fourier transforms to develop an array of FFT spectra. This array can then be used for the generation of waterfalls and color contour displays (spectrograms). The spectrum calculation allows for standard parameters such as
With Rotate2, spectra can be computed as a function of either time or RPM or number. Rotate2 uses Intel's Signal Processing Library to calculate waterfalls twice as fast as conventional programs. This makes it possible for you to quickly check your data in the field- you can take a "quick look" at your data to make sure that you are getting the right stuff. Your test productivity is enhanced by not having to go back and retest later. Once we have specified the block-size or frame size, number of spectral lines (50 to 12800), number of averages (1-500), type of window (Hanning, Hamming, Flat Top or Uniform), and other various parameters, we run the Waterfall generation. The results of running the Waterfall Calculation can be seen below.
Rotate presents your original waterfall plot in this perspective. You can manipulate the angle of view for a better look at the data, and we will show how that is done later. Notice that the front scale on this plot is Frequency - your frequency choices are between Cycles Per Minute (CPM) or Hertz (Hz), whichever is more appropriate and a linear or log scale. The upper pane displays a cursor cut at 200.2 Hz. The waterfall plot above displays a broad range of data, but you may want to examine closely a portion of the graph. Rotate's ZOOM capability easily allows the user to examine any part of the graph in greater detail. Below is a close image of a portion of the graph above.
These same calculations that generated the waterfall plot can be used to view the data in a different format- that of a Color Contour / Intensity plot or Spectrogram as shown below. Viewing the Color Contour plot gives you a different angle on the data and can point out areas of concern that were hidden behind data peaks in the waterfall plot. The position of intense noise or vibration can be easily seen. Once again the cursor cut is at 200.2 Hz.
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