Spectrum Analyzer Mode
R&S
®
Spectrum Rider FPH
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User Manual 1321.1011.02 ─ 06.00
Special touchscreen gesture
Alternatively, define the reference level by swiping vertically across the touchscreen to
change the reference level
See
Chapter 4.2.2, "Change Reference Level"
By default, the reference level corresponds to the grid line at the top of the diagram.
You can also change the position of the reference level to another grid line if you have
a signal that would otherwise overlap with the top of the diagram area. The R&S Spec-
trum Rider indicates the current reference level position with a triangle at the corre-
sponding grid line on the vertical axis. See index 5 on
Figure 4-1
.
1. Press the [AMPT] key.
2. Select the "Range / Ref Pos" softkey.
The R&S Spectrum Rider opens a submenu.
3. Select the "Ref Position 10…" menu item.
The R&S Spectrum Rider opens an input field to define the reference position.
4. Enter the number of the grid line you want the reference level to position at.
The range is from 0 to 10. "0" corresponds to the lowest grid line, "10" corresponds
to highest grid line.
6.2.3.2
Setting a Display Range
The display range determines the scaling or resolution of the vertical axis. In the
default state, the display range is a logarithmic scaling over a 100 dB. This corre-
sponds to 10 dB per grid division. The R&S Spectrum Rider provides other display
ranges that either increase or decrease the resolution of the vertical axis.
However, increasing resolution does not increase the accuracy of, for example, the
marker level readout, but only makes it easier to read values off the trace.
You can also select a linear scale for the vertical axis. In that case, the power levels
are expressed as a percentage of the reference level. Linear scaling is useful to dis-
play AM modulated carriers in the time domain, for example.
1. Press the [AMPT] key.
2. Select the "Range / Ref Pos" softkey.
The R&S Spectrum Rider opens a submenu to select the display range.
3. Select the display range you need.
The R&S Spectrum Rider adjusts the vertical axis accordingly.
6.2.3.3
Selecting the Display Unit
By default, the vertical axis (and therefore the reference level) is scaled in dBm. How-
ever, the units dBmV, dBV, Watt and Volt are also available. Selecting the right unit is
Configuring Spectrum Measurements
