10–15
Zoom and Math Setup Menus
SETUP — FFT Average
§
— used for displaying the FFT power averaging of an FFT source
trace, power averaging being useful for characterizing broadband
noise or periodic signals without a stable trigger signal. Total power
— signal and noise — is measured at each frequency. The source
trace must be an FFT function. See the final section of this chapter,
and Appendix C, for when and how to use FFT.
use Math?
To choose a math function.
Math Type
To select “FFT AVG”.
FFT result
To select the output format of the FFT Average: “Magnitude”,
“Power Density”, “Power Spectrum”.
for
For selecting the number of sweeps.
of
To select the FFT source.
§
Only with WP02 Spectral Analysis package. See “Signal
Analysis” in Appendix A for specifications.
Note: FFT Average can be reset by pressing CLEAR
SWEEPS. The number of currently accumulated
waveforms is then shown in the Displayed Trace field of
the function or its expansion.
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