Spectrum analysis
R&S
®
RTP
421User Manual 1337.9952.02 ─ 12
●
The THD measurements are an extension to the basic THD measurement. See
Chapter 8.2.7, "Spectrum measurements", on page 369 for details.
●
Cursor measurements on spectrum waveforms provide easy center definition and
peak search functions, see Chapter 8.1.1.2, "Cursor measurements on spectrum
waveforms", on page 320.
9.2.3 Configuring spectrograms
Spectrograms are only available if the Spectrum analysis option R&S RTP-K37 is acti-
vated.
1. Tap the "Spectrogram" icon on the toolbar.
The "Spectrogram" toolbar assist opens.
2. Select the source of the spectrogram.
A spectrogram diagram is displayed. A new signal icon for the spectrogram is dis-
played on the signal bar ("SGx").
If the selected source is a channel waveform, an FFT is started, on which the spec-
trogram is created.
Additional settings for time lines become available in the dialog box.
3. Optionally, to display a time line and thus mark a specific waveform in the spectro-
gram, select "Enable" for one of the two time lines.
A small arrow icon labeled "T1" / "T2" indicates the position of the time line in the
spectrogram.
The spectrum diagram displays the results for the selected waveforms. A new sig-
nal icon is displayed on the signal bar for each time line ("SGxTL1|2").
4. To view the spectrum for each time line in a separate diagram, drag the signal icon
for one time line to the diagram area and drop it.
A new window is displayed for the selected time line, and the original diagram dis-
plays the other time line.
5. To view a different waveform from the spectrogram, move the time lines in the
spectrogram.
9.2.4 Spectrogram configuration settings
Access: [FFT] > "FFT setup" > "Spectogram" tab
Spectrograms are only available if the option R&S RTP-K37 is activated. Furthermore,
a math (FFT) waveform must be configured and enabled.
See Chapter 9.1.2, "Configuring spectrum waveforms", on page 406.
Spectrum analysis (option R&S
RTP-K37)
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