Spider DSA User’s Manual
191
Reference Channel allows the user to choose a channel as a reference for the
calculation of the Frequency Response Function, Coherence, and Cross Power
spectrum. The user can specify the selected channel to be either the excitation
(input) channel or the response (response) channel when creating the test. Signals
such as CPS, Coherence and FRF are defined based on this selection.
Run Schedule
The Run Schedule allows a test to be run automatically through a preset routine.
The run schedules for FFT analysis tests are only effective in Black Box Mode.
Schedules can include loops and time periods for running the test at specified
levels and durations. The run schedule can also activate any user-defined events
defined in the Event Action Rules. Click on event names in the list on the left to
insert them into the schedule and use the buttons on top to edit or remove them
or change their order. The schedule is activated when the test is started in Black
Box mode.
Figure 134. Run Schedule Tab
Measured Signals in FFT
The “Live Signals” tab on the lower left of the screen in EDM shows all the
measured signals available for display. Listed here, for all test modes, are the time
streams of the input channels labeled by their location ID (“PT1”, “PT2”, “PT3”…
by default), and the output drive time stream. The location ID of the channels can
be changed under the Channel Table tab. Time stream signals are labels as
Ch1[t]. The numerical value depends on the channel index.
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