Configuring the RF Signal
R&S
®
SMW200A
568User Manual 1175.6632.02 ─ 30
The remote commands required to define these settings are described in Chap-
ter 14.19.16, "SOURce:POWer Subsystem", on page 1188.
How to: See Chapter 8.9.2.3, "How to Enable the ALC", on page 570.
Settings
State............................................................................................................................568
Mode........................................................................................................................... 568
Detector Sensitivity..................................................................................................... 569
Driver Amplifier............................................................................................................569
Sample Level.............................................................................................................. 569
State
Selects the internal level control mode.
"Auto"
Selects the most appropriate ALC mode automatically.
"On"
Activates ALC permanently.
"Off (Sample & Hold)"
Deactivates the ALC, but allows you to recalibrate the level at each
frequency and level change. The value remains up to the next
change.
"Sample & On"
Enables automatic level control after a short sample pulse.
"Off (Table)"
Controls the level using the attenuation values of the internal ALC
table.
"Table & On"
Starts with the attenuation setting from the internal ALC table and
continues with automatic level control.
For further details on the individual settings, an overview of the functionality and details
on what is to be considered, see "ALC states and their effects" on page 566.
Note:
The ALC modes "Off (Sample & Hold)" and "Sample & On" use a short sample pulse to
set the level control. To adjust the level of this sample pulse, see "Sample Level"
on page 569 in the ALC dialog. It does not consider any signal headroom, e.g.
applied to a user defined ARB waveform.
How to: See Chapter 8.9.2.3, "How to Enable the ALC", on page 570.
Remote command:
[:SOURce<hw>]:POWer:ALC[:STATe] on page 1189
Mode
In ALC > State AUTO, the R&S SMW indicates the currently active ALC mode that is
set automatically.
Remote command:
[:SOURce<hw>]:POWer:ALC:MODE? on page 1189
Improving Level Performance
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