Spectrum Analyzer Mode
R&S
®
Spectrum Rider FPH
158
User Manual 1321.1011.02 ─ 11
The level range is now adjusted, the R&S Spectrum Rider is able to map its com-
plete color range to the level range of the signal.
The USB signal parts with a low amplitude are in a shade of green while signal
parts with a high amplitude are blue.
The best way to display a spectrogram is therefore to reduce the level range until
the lowest signal part is mapped to the lower end of the color map and the highest
signal part to the upper end of the color map.
In a last step, you can configure the spectrogram in a way that it only shows signal
peaks in color and the noise floor in black. To get such a result, you have to reduce
the level range, until the noise floor is outside the displayed range.
8. Instead of entering a level range of 45 dB, enter a level range of 40 dB.
This level provides a high contrast between signal parts that are above the noise
floor that is drawn in black.
To show details of the noise floor and exclude the peak levels, you have to lower
the spectrogram reference level until it is just above the noise floor.
The R&S Spectrum Rider will then display the signal parts that are above the refer-
ence level in only one color, which is the color at the upper border of the color map.
Auto range
Alternatively, you can perform an auto range action to adjust the reference range and
the reference level of the spectrogram for optimal display.
1. Press [MEAS] key.
2. Select "Settings" softkey.
3. Select "Display" softkey.
The R&S Spectrum Rider opens a submenu that contains the display settings for
selection.
Performing Spectrum Measurements
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