Spider DSA User’s Manual
260
Average Number is the number of blocks that are averaged for the signal
spectrum. Increasing the number of averages reduces the variance of the signal
spectrum.
FFT Average On/Off enables / disables the FFT average function.
LPF Cutoff Frequency (Hz) is the application of low-pass filter.
Reference Channel allows the user to choose a channel as a reference for
calculating the frequency response function, coherence and cross power
spectrum. The user can specify the selected channel to be either the response
channel or the excitation channel. Signals like CPS, Coherence and FRF are
defined based on this selection.
Octave Filter Parameters
Octave Resolution defines the octave resolution including: 1/1, 1/3, 1/6, 1/12,
and 1/24.
Low Frequency Bound (Hz) defines the low frequency (span) of the
measurement in Hz.
High Frequency Bound (Hz) defines the high frequency (span) of the
measurement in Hz.
Average Type defines the averaging type including: exponential, linear and peak
hold.
Frequency Weighting defines the frequency weighting including: A, B, C or Z.
Time Trace Frequency (Hz) defines which center band frequency, overall or
frequency weighted band is used to plot time traces.
Trace Update Time(s) defines the time trace display duration. Select a larger
update time to create longer time trace display duration.
Sound Level Meter Parameters
Time Trace Type defines the time weighting includes L, Leq and LE.
Analysis Period specifies the time duration for each analysis period.
Result Update Time(s) defines how many times the result will be updated.
Result History defines the measurement length of the result history.
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