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Spectrum analysis
R&S
®
MXO 4 Series
230User Manual 1335.5337.02 ─ 05
To configure the spectrum
By default, a suitable frequency range for the expected horizontal values according to
the resolution bandwidth is selected, in respect to performance and precision. Span
and RBW settings are coupled. If a more precise evaluation is required, for example for
postprocessing in a different application, disable the coupling and change the fre-
quency ranges and resolution bandwidth values as required.
1. Press [Spectrum].
The "Spectrum" dialog opens.
2. In the "Setup" tab, specify the frequency range you want to display using one of the
following methods:
● Select "CF span". Enter a "Center" and a "Span" that define the spectrum.
● Select "Start Stop". Enter a "Start" and "Stop" frequencies that define the spec-
trum.
● Tap the "Full span" button to display the complete spectrum resulting from the
FFT analysis.
3. Define the resolution bandwidth for the spectrum result.
The resolution bandwidth defines how precise the results are, i.e. how close
together the individual frequencies can be. Small values result in high precision, as
the distance between two distinguishable frequencies is small. Higher values
decrease the precision, but increase performance.
You can define the RBW manually, or couple it to other settings. Do one of the fol-
lowing:
● To couple the RBW to the span, enable "Auto RBW". Define the "Span/RBW"
ratio, the smaller the ratio, the higher the RBW becomes to display the same
frequency span.
● Disable "Auto RBW". Enter the "RBW" manually.
4. Tap "Advanced".
5. Select the most suitable "Window type" for your source data. Window functions are
multiplied with the input values and thus can improve the spectrum display. For
details, see "Window type" on page 233.
To restrict the input values (gating)
You can restrict the time range for which the FFT is calculated, resulting in a restricted
spectrum.
1. Open [Spectrum] > "Gate" tab.
2. Enter the "Start" and the "Stop" times that define the gate area.
3. Set the "Position" and the "Width".
The spectrum waveform displays the spectrum for the specified time span.
Configuring spectrum waveforms
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