Spider DSA User’s Manual
193
Figure 136 Frequency response functions measured in a high channel count
system
Time block signals are labels as Block(Ch1)[t]. The numerical value depends on
the channel index. For the convenience of signal calculation and transformation,
the time stream is chopped into the individual blocks by block size. Each block
contains the defined number of data points sampled from the time stream signals.
APS (Auto-Power Spectrum) signals are labeled as APS(Ch1)[f]. The numerical
value depends on the channel index.
Output Setup
The FFT test has an additional tab for output channel setup. Here you can
configure one or more output channels as shaker drive or other DUT stimulation
signals. Since closed loop control is not available, the user should be careful to
stay within the safety limits of the shaker/amplifier and test object when
configuring the output levels. All enabled channels will send out drive signals
while the test is running. The following window can be found from Setup-
>Output Channels.
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