Improving Level Performance
R&S
®
SMA100B
144
User Manual 1178.3834.02 ─ 03
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DUT tests under low signal to noise conditions
Low output power is suitable to test the behavior of a DUT under low signal to
noise conditions.
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Uninterrupted level settings with constant VSWR
A fix attenuation value is required for obtaining uninterrupted level settings with
constant VSWR.
The configuration "RF Off Mode > Unchanged" ensures that constant VSWR is
maintained if you turn the signal off and on again.
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Noise sensitive applications
The parameter "RF OFF Mode > Full Attenuation" sets maximum attenuation and
thus suppresses noise when you turn off the RF signal.
6.1.1 Attenuator Settings
Access:
► Select "Level" > "Level > Attenuator".
In the "Attenuator" dialog, you can select the operating mode of the electronic
attenuator, the instrument is equipped with.
The remote commands required to define these settings are described in
on page 347 and
Settings
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Mode
Determines the operating mode of the attenuator at the RF output.
"Auto"
Adjusts the attenuator settings within the full variation range automati-
cally.
"Fixed"
Fixes the attenuator and amplifier stages at the current position and
provides signal output with constant output VSWR. The resulting var-
iation range is calculated and indicated.
Attenuator
