Spectrum Analyzer Mode
R&S
®
Spectrum Rider FPH
167
User Manual 1321.1011.02 ─ 06.00
relevant for the marker level display because the unit of the marker level is the same
as the reference level.
1. Press the [AMPT] key.
2. Select the "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 the [AMPT] key.
2. Select the "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,
e.g. in a television cable network, the input mixer reduces the R&S Spectrum Rider
inherent spurious products. However, the inherent noise display of the R&S Spec-
trum Rider increases due to the increased attenuation in front of the input mixer.
●
Auto Low Noise
If this mode is active, the R&S Spectrum Rider sets the RF attenuation 10 dB
lower. This increases the sensitivity of the R&S Spectrum Rider, which means that
the inherent noise display decreases due to the lower attenuation in front of the
input mixer.
Configuring Spectrum Measurements
