R&S FSH Spectrum Analyzer Mode
Configuring Spectrum Measurements
Operating Manual 1173.6275.12 - 30 101
► Press the AMPT key.
► Press the "RF Att / Amp / Imp" softkey.
► Select either the "Auto Low Distortion" or the "Auto Low Noise" menu item.
The R&S FSH sets the attenuation according to the table above.
► Select the "Manual: 0 dB" menu item for manual selection of the RF attenuation.
The R&S FSH opens an input field to set the RF attenuation. You can set the
attenuation from 0 dB to 40 dB in 5 dB steps.
To indicate a manual attenuation, the R&S FSH puts a red dot at the "Att:"
hardware setting ( ).
3.2.2.6 Using the Preamplifier
To increase the input sensitivity, the R&S FSH provides an integrated 20 dB
preamplifier after the input mixer.
In the default state of the R&S FSH, the preamplifer is turned off. If you want to
measure signals with low powers, you can turn it on.
► Press the AMPT key.
► Press the "RF Att / Amp / Imp" softkey.
► Select either the "Preamp On" or "Preamp Off" menu item.
The R&S FSH turns the preamplifier on and off.
3.2.2.7 Setting the Input Impedance
In the default state, the input impedance is 50 Ω.
The R&S FSH can also handle 75 Ω systems. The R&S FSH does not select a 75 Ω
RF input per se. 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 FSH automatically considers the conversion
factor when a value of 75 Ω is set.
► Press the AMPT key.
► Press the "RF Att / Amp / Imp" softkey.
► Select the impedance you need.
You can also use other matching pads (e.g. R&S RAM or R&S FSH-Z38) by
activating transducer factors.
3.2.2.8 Using Transducer Factors
For more information see "Using Transducer Factors".
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