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OPERATION
Figure 7: Z Frequency 2D
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ss_view('vib0000.dat', J:\data.dat
C:\stuff\> pvr2csv
2-D Frequency options
The 2-D Fourier graph splits frequency data into small
time ‘slices’ to visualize time-dependent trends in the
frequency data. By default, the full frequency range is
shown on the 2-D Fourier graphs, and the data are
segmented into 4 slices per second (this can be
adjusted by editing the script). Since the FFT
implementation requires each slice to be of equal
length, the data will be reshaped into equal-length
slices, and (if necessary) up to one slice of trailing data
will be discarded to maintain equal slice lengths.
The startfreq and endfreq parameters will constrain the
frequency range displayed, and the ceiling parameter
will constrain the maximum height (ceiling) of the plot
by cutting the tops off peaks above that value. For
example:
Command Window
100, 500);
will show only the frequency range between 100 and
500 Hz.
Unlike a 2-d plot, Matlab’s 3d surface plot cannot
ss_view('vib0000.dat', J:\data.dat 0.5);
C:\stuff\> pvr2csv
C:\stuff\> pvr2csv J:\data.dat
easily be zoomed or panned to show only a specific
region of interest. To more easily view a specific data
feature, optional parameters can be input to constrain
the contents of the 2-D Fourier graphs. The parameters
accepted are:
Command Window
ss_view('filename', startfreq,
endfreq, ceiling);
Command Window
100, 500,
will show the frequency range between 100 and 500
Hz, and also ceiling the amplitude to 0.5g so that small
features can be seen.
To provide a ceiling value without entering frequency
constraints, you can pass an empty string (two single
REVISION N0. 001
REVISION DATE: 08-24-2010
www.mide.com
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