Spectrum analysis
R&S
®
RTE
405User Manual 1326.1032.02 ─ 20
To configure phase results
1. Open the "FFT Y-Units" tab of the "Math" dialog box.
2. Select the scaling unit.
3. To eliminate phase shifts due to a limitation of the value range, enable the
"Unwrap" function.
4. To suppress small phase values due to noise, enable the "Suppression" function
and enter a "Threshold" value.
To couple spectrum displays
The settings for one or more spectrums can be coupled. Thus, if any FFT setting for
any of the coupled spectrums are changed, they are changed for all coupled spec-
trums.
1. Open the "FFT Coupling" tab of the "Math" dialog box.
2. Select the spectrums that you need to couple. You cannot select the spectrum for
the currently selected math waveform. Its settings are applied to the selected spec-
trums.
3. If necessary, define an FFT function to be used for the coupled math waveforms so
that a spectrum is displayed. See Chapter 7.3.1, "Displaying math waveforms",
on page 295.
9.1.3 FFT configuration settings
● FFT setup..............................................................................................................405
● FFT overlap...........................................................................................................409
● FFT gating.............................................................................................................410
● Peak list.................................................................................................................413
● FFT Y-Units...........................................................................................................413
● FFT coupling......................................................................................................... 416
9.1.3.1 FFT setup
Access: [MATH] > "FFT Setup"
In this tab, you define the settings for the FFT window. The display can be restricted to
the results for a certain time base extract and to a specified frequency range.
Additional settings are available on this tab if the Spectrum Analysis option (R&S RTE-
K18) is installed.
See Chapter 9.2.4, "Spectrogram configuration settings", on page 420.
FFT analysis
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