Rohde & Schwarz SMM100A, User Manual

Page: 388 / 1088

Configuring the RF signal
R&S
®
SMM100A
388 User Manual 1179.1341.02 ─ 05
In this operating mode, the generator adjusts the output level whenever the fre-
quency or level setting changes.
●
Noise sensitive applications
The parameter "RF OFF Mode > Full Attenuation" sets maximum attenuation and
thus suppresses noise when you turn off the RF signal.
Interactions and characteristics
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The spectral purity of the RF output signal decreases with high attenuation.
●
Fixed mode is effective when automatic level control is activated ( ALC State = On ).
●
The setting of the RF OFF Mode > Full Attenuation has priority over the RF level
Mode > Fixed or Manual , regardless of the selected settings characteristics.
7.12.1.1 Attenuator settings
Access:
► Select "RF" > "RF Level" > "Level > Attenuator".
In the "Attenuator" dialog, you can select the operating mode of the step attenuator,
the instrument is equipped with.
The remote commands required to define these settings are described in Chap-
ter 13.13, "OUTPut subsystem" , on page 695 and Chapter 13.16.16, "SOURce:POWer
subsystem" , on page 934.
Settings
Mode ........................................................................................................................... 388
Attenuation .................................................................................................................. 389
Level Range ................................................................................................................ 389
RF OFF Mode ............................................................................................................. 389
Mode
Determines the operating mode of the step attenuator.
Note: RF OFF Mode > Full Attenuation has higher priority than "Fixed" or "Manual".
"Auto" Adjusts the attenuator settings automatically.
Improving level performance