R&S FSH
Getting Started
Using the Spectrum Analyzer
Quick Start Guide 1309.6269.12 - 09
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2.1 Using the Spectrum Analyzer
This chapter provides a short overview of the first steps of the measurements you can
perform with the R&S FSH.
2.1.1 Attenuating the Signal
You can attenuate the signal to a suitable level either manually or automatically.
In case of automatic attenuation, the level of attenuation at the RF input depends on
the current reference level. The R&S FSH provides two ways of automatic attenuation.
For the highest possible sensitivity it provides the "Auto Low Noise" attenuation mode.
For the lowest possible intermodulation, it provides the "Auto Low Distortion" mode.
The main difference between the two modes is that the attenuation level is 5 to 10 dB
higher in case of "Auto Low Distortion" than it is for "Auto Low Noise". In the default
state, "Auto Low Distortion" is active.
► Press the AMPT key.
► Press the "RF Att/Amp/Imp" softkey.
► Select either the "Auto Low Noise" or "Auto Low Distortion" menu item.
The R&S FSH shows the current attenuation level in the hardware settings
overview ("Att.:" caption). The currently active menu item has a green background.
You can also set the attenuation manually. The R&S FSH provides attenuation in the
range from 0 to 40 dB in 5 dB steps.
► Press the AMPT key.
► Press the "RF Att/Amp/Imp" softkey.
► Select either the "Man: 0 dB" menu item.
The R&S FSH opens an input field to define the attenuation.
