Spectrum Analyzer Mode
R&S
®
Spectrum Rider FPH
179
User Manual 1321.1011.02 ─ 11
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
relevant for the marker level display because the unit of the marker level is the same
as the reference level.
1. Press [AMPT] key.
2. Select "Unit" softkey.
The R&S Spectrum Rider opens a submenu to select the display unit.
3. Select one of the available units.
The R&S Spectrum Rider adjusts the vertical axis accordingly.
6.2.3.4
Setting a Reference Offset
You can define a reference offset for the reference level. With a reference offset, you
can increase the reference level by a certain amount. This is useful, for example, if an
attenuator or amplifier has been inserted before the RF input. The R&S Spectrum
Rider automatically takes the loss or gain into account when the level is displayed and
no manual calculations are necessary. A loss introduced at the RF input must be
entered as a positive number and a gain as a negative number.
1. Press [AMPT] key.
2. Select "Ref Offset"" softkey.
The R&S Spectrum Rider opens an entry box to define input field.
3. Enter the offset you need.
The R&S Spectrum Rider includes the offset in puts in the measurement.
To indicate an offset other than 0, the R&S Spectrum Rider puts a blue dot at the
"REF" field displays in the "Parameter View".
6.2.3.5
Setting the RF Attenuation
RF attenuation adjusts the input range inside the analyzer. It is coupled directly to the
reference level. If you have set a high reference level, RF attenuation is turned on in 10
dB steps according to the table below so that the input mixer always remains in the lin-
ear range.
The R&S Spectrum Rider provides three attenuation modes.
●
"Auto Low Distortion"
If this mode is active, the R&S Spectrum Rider sets the RF attenuation 10 dB
higher according to the table below, making the stress of the input mixer 10 dB less
at the specified reference level. If the spectrum is densely occupied with signals,
Configuring Spectrum Measurements
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