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Getting Started
R&S
®
Spectrum Rider FPH
77
User Manual 1321.1011.02 ─ 11
3.3.1.1
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 Spectrum Rider 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 dB 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.
1. Press [AMPT] key.
2. Select "Att/Amp/Imp" softkey.
3. Select either the "Auto Low Noise" or "Auto Low Distortion" menu item.
The R&S Spectrum Rider shows the current attenuation level in the "Parameter
view". The currently active menu item has a blue background and the selected
parameters is indicated with a blue dot in the menu item.
You can also set the attenuation manually. TheR&S Spectrum Rider provides
attenuation in the range from 0 dB to 40 dB in 5 dB steps.
4. Press [AMPT] key.
5. Select "Att/Amp/Imp" softkey.
6. Select the "Manual Att" menu item.
The R&S Spectrum Rider opens an entry box to define the attenuation. Two meth-
ods are provided to fill in the input fields:
● Directly with the number keys
Trying Out the Instrument
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