Spectrum Analysis
R&S
®
Scope Rider RTH
108User Manual 1326.1578.02 ─ 12
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Figure 6-1: FFT display
1 = Resolution bandwidth (RBW), determined from channel bandwidth and frequency span
2 = Time scale (time per division)
3 = Power vs. time waveform
4 = Amplitude (y-axis) scale (range per division)
5 = FFT mode active
6 = Frequency values (x-axis)
7 = Channel providing input data
8 = Amplitude values (y-axis)
9 = 0 dBm line (y-axis)
Data source
FFT analysis is performed on the data captured from one of the active input channels.
Analysis can be performed on all channels simultaneously.
Time base
FFT analysis is generally performed on the data captured during the entire data acqui-
sition. To restrict the time base for which FFT analysis is to be performed (thus reduc-
ing calculation time), you must change the Time Scale. Gating or zooming is not availa-
ble for FFT analysis.
Frequency range
The spectrum display can also be restricted to a specified frequency range. By default,
the full determined spectrum is displayed. However, you can restrict the channel band-
width to a smaller value.
FFT Mode
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