Spider DSA User’s Manual
362
Figure 221. Measurement Quantities in SRS
Time streams: this is the same as any other applications on the Spider. Time
streams are always available for viewing and recording. It is a very useful tool for
observing if the input signals are in the valid range or not. The recorded sine wave
can also be used for further post-processing.
Block time signals: These are the block captured signals that are used for SRS
analysis. Acquisition Mode will control how the block time signals are acquired.
SRS: Shock Response Spectra will be calculated for each block of time signals.
The engineering units of the spectrum are determined by the sensor units
specified for the input channel. The spectra are often denoted as three types:
Maximum Positive spectrum; Maximum Negative spectrum and Maximum-
Maximum spectrum.
Maximum Positive Spectrum: This is the largest positive response due to the
transient input, without reference to the duration of the input.
Maximum Negative Spectrum: This is the largest negative response due to
the transient input, without reference to the duration of the input.
Maximax Spectrum: this is the envelope of the absolute values of the positive
and negative spectra. It is the most often used SRS data type. The log-log
Maximax is the universally accepted format for SRS presentation.
SRS Analysis Parameters and Synthesis Parameters
All the SRS analysis test parameters can be found in Test Config->Analysis
Parameters. FFT analysis parameters are defined in the same way as other FFT
tests. SRS parameters include:
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