Spectrum Analyzer Mode
R&S
®
Cable Rider ZPH
216
User Manual 1321.0950.02 ─ 07
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Setting the Reference Level
..................................................................................216
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Setting a Display Range
........................................................................................217
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Selecting the Display Unit
..................................................................................... 217
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Setting a Reference Offset
....................................................................................217
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Setting the RF Attenuation
....................................................................................218
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Using the Preamplifier
...........................................................................................219
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Setting the Input Impedance
................................................................................. 219
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Using Transducer Factors
.....................................................................................220
8.2.3.1
Setting the Reference Level
The reference level is represented graphically by the grid line at the top of the diagram.
The reference level sets the input signal gain up to the display stage. If the reference
level is low, the gain is high. That means that even weak signals are displayed clearly.
If you are measuring strong signals, you have to set a high reference level to prevent
an overload of the signal path of the analyzer and to keep the signal within the display
range. If you are measuring the spectrum of a composite signal, make sure that the
reference level is high enough to cover all signals and that all signals are within the
measurement diagram.
1. Press the [SCALE/AMPT] key.
2. Select the "Ref Level" softkey.
The R&S Cable Rider ZPH opens an input field to define the reference level.
3. Enter the reference level you require.
If you change the reference level, the R&S Cable Rider ZPH adjusts the position of
the trace as you make the changes.
Special touchscreen gesture
Alternatively, define the reference level by swiping vertically across the touchscreen to
change the reference level.
See
Chapter 5.1.2, "Change Reference Level"
,
on page 90.
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 Cable
Rider ZPH indicates the current reference level position with a triangle at the corre-
sponding grid line on the vertical axis. See index 9 on
Chapter 4.1, "Screen Layout and
Elements"
,
on page 32.
1. Press the [SCALE/AMPT] key.
2. Select the "Range / Ref Pos" softkey.
The R&S Cable Rider ZPH opens a submenu.
3. Select the "Ref Position 10…" menu item.
The R&S Cable Rider ZPH opens an input field to define the reference position.
Configuring Spectrum Measurements
