Spider DSA User’s Manual
292
Time Streams deals with the raw time stream data from the input channels. For
the 7.5 hardware units, there will be up to two tachometer channels in addition to
the input channels.
RPM Streams measure the instantaneous RPM of the tachometer channels and
displays continuously with respect to time similar to a time stream
Order Spectra measure the Order spectrum of each of the channels with the
selected reference tachometer channel for the 7.4 hardware units or with the
dedicated tachometer 1 as reference channel for the 7.5 hardware units.
FFT Spectra defines the spectrum of the channels with respect to the frequency
as the X axis. This is identical to the conventional FFT spectrum on an FFT test.
Order Tracks can configure and measure order tracked signals for a particular
channel and a particular order. One input channel can generate multiple order
tracked signals, each for a different order.
Band RMS Spectra plots the RMS amplitude in a user defined band of
frequencies versus the RPM.
3D Signal displays the signal plots in 3D.
All Signals gives a view of signals from all the tabs to the user.
Like the measured signals in any of the DSA tests on EDM, the time stream
signals can be recorded continuously and the other signals that appear as blocks
or frames of data can be saved to the PC or to the internal flash of the Spider.
Time stream Signals
The time stream signals are the raw time waveforms applied to the input
channels. They are displayed with relative time on the Y-axis.
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