Rohde & Schwarz FSH4, Operating Manual

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R&S FSH Spectrum Analyzer Mode
Configuring Spectrum Measurements
Operating Manual 1309.6275.12 - 14 83
You can check the status of the RF attenuation and the preamplifier in the
measurement setup dialog and the hardware settings area of the display.
Preamplifier OFF Preamplifier ON
RF Attenuation RF Attenuation
Reference Level
Low Noise Low Distortion Low Noise Low Distortion
Z -30 dBm 0 dB 0 dB 0 dB 0 dB
-29 to -25 dBm 0 dB 0 dB 0 dB 5 dB
-24 to -20 dBm 0 dB 0 dB 0 dB 10 dB
-19 to -15 dBm 0 dB 5 dB 5 dB 15 dB
-14 to -10 dBm 0 dB 10 dB 10 dB 20 dB
-9 to -5 dBm 5 dB 15 dB 15 dB 25 dB
-4 to 0 dBm 10 dB 20 dB 20 dB 30 dB
1 to 5 dBm 15 dB 25 dB 25 dB 35 dB
6 to 10 dBm 20 dB 30 dB 30 dB 40 dB
11 to 15 dBm 25 dB 35 dB 35 dB 40 dB
16 to 20 dBm 30 dB 40 dB 40 dB 40 dB
21 to 25 dBm 35 dB 40 dB 40 dB 40 dB
26 to 30 dBm 40 dB 40 dB 40 dB 40 dB
M Press the AMPT key.
M Press the "RF Att / Amp / Imp" softkey.
M 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.
M 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 (
).
2.2.2.6 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.
M Press the AMPT key.
M Press the "RF Att / Amp / Imp" softkey.
M Select either the "Preamp On" or "Preamp Off" menu item.
The R&S FSH turns the preamplifier on and off.