Spectrum Analyzer Mode
R&S
®
Spectrum Rider FPH
169
User Manual 1321.1011.02 ─ 06.00
6.2.3.6
Using the Preamplifier (R&S FPH-B22)
To increase the input sensitivity, the R&S Spectrum Rider provides an integrated 20 dB
preamplifier after the input mixer.
In the default state of the R&S Spectrum Rider, the preamplifier is turned off. If you
want to measure signals with low powers, you can turn it on.
1. Press the [AMPT] key.
2. Select the "Att / Amp / Imp" softkey.
3. Enable or disable the checkbox to turn on or off the "Preamp" menu item.
The R&S Spectrum Rider turns the preamplifier on and off.
6.2.3.7
Setting the Input Impedance
In the default state, the input impedance is 50
Ω
.
The R&S Spectrum Rider can also handle 75
Ω
systems. The R&S Spectrum Rider
does not select a 75
Ω
RF input. Instead it selects a 75
Ω
matching pad connected at
the RF input. The 50/75
Ω
matching pad R&S RAZ is recommended for 75
Ω
matching
(see recommended accessories). The R&S Spectrum Rider automatically considers
the conversion factor when a value of 75
Ω
is set.
1. Press the [AMPT] key.
2. Select the "Att / Amp / Imp" softkey.
3. Select the impedance you need.
You can also use other matching pads (e.g. R&S RAM or R&S FSH-Z38) by acti-
vating transducer factors.
6.2.3.8
Using Transducer Factors
For more information, see
Chapter 6.4, "Using Transducer Factors"
6.2.4
Setting Bandwidths
The bandwidth menu contains all settings to set up filter bandwidths available in the
R&S Spectrum Rider. You can access it with the [BW] key.
●
Setting the Resolution Bandwidth
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6.2.4.1
Setting the Resolution Bandwidth
The resolution bandwidth in a spectrum analyzer determines the frequency resolution
for frequency domain measurements and therefore determines how well it can sepa-
Configuring Spectrum Measurements