Spectrum analysis
R&S
®
RTP
406User Manual 1337.9952.02 ─ 12
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FFT -dφ*df (group delay): the negative derivative of the phase with respect to fre-
quency; useful to measure phase distortion
9.1.2 Configuring spectrum waveforms
During FFT analysis, a signal in the time domain is converted to a spectrum of frequen-
cies. A basic spectrum waveform can be displayed quickly. By defining additional FFT
parameters, the waveform can be configured in more detail.
As a result, either the magnitude or the phase of the determined frequencies can be
displayed, or more complex FFT functions. Analysis can be restricted to an extract of
the original time base, and the results display can be restricted to a specified frequency
range.
To display a basic spectrum waveform using the toolbar
1. Add the "FFT" icon to the toolbar, see Chapter 3.3.6.2, "Configuring the toolbar",
on page 74 .
2. Tap the "FFT" icon on the toolbar.
The FFT toolbar assist opens.
3. Tap the waveform for which the FFT is performed.
The first available math waveform is configured to use the selected waveform as a
source and the "Mag(FFT(x))" operator, and is enabled. The spectrum waveform is
displayed in a new diagram.
To display a basic spectrum waveform using the [Math] key
1. Press the [FFT] key to open the "FFT" tab of the "Math" dialog box.
2. Set the "Source" to the input signal.
3. Enable "Display".
4. If necessary, edit the spectrum waveform parameters as described in the following
procedures.
To display advanced spectrum waveforms
Other FFT results than the basic frequency magnitude can be displayed with the "For-
mula Editor".
1. Open the "Menu" > "Math" dialog.
2. Select the Equation tab.
3. Double-tap the editing area.
FFT analysis
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