Instrument Function
R&S
®
SMB100A
153
Operating Manual 1407.0806.32 ─ 21
The signal generator outputs the set level for 3 to 5
ms after level or frequency set-
ting during a Sample & hold measurement.
Instruments equipped with one of the options R&S
SMB-B112L, R&S
SMB-B120L
or R&S
SMB-B140L come without step attenuator.
The level control status is permanently displayed as a status message in the info line.
Automatic Level Control Settings
To open the "Automatic Level Control" dialog, select "RF" > "Configure" > "Automatic
Level Control" or use the MENU key under "RF".
The combined dialog "ALC / UCOR" is divided into the several sections and provides
access to the "Automatic Level Control" settings and to function "User Correction", see
Chapter 5.3.5.6, "User Correction"
State - ALC
Activates/deactivates internal level control.
"Auto"
The instrument selects the most appropriate ALC mode automati-
cally.
ALC is on in most operating conditions. Default state.
"On"
Activates ALC, regardless of the operating conditions.
"Off (Sample & Hold)"
Deactivates internal level control.
Sample & hold closes the level control loop at every frequency and
level change for a short period of time. The level control voltage is
sampled and then clamped.
Remote command:
[:SOURce<hw>]:POWer:ALC[:STATe]
RF During Power Search - ALC
Activates the mode for the mechanical step attenuator and for output during ALC
power search.
"Normal"
The RF output is active during power search.
"Minimum"
The RF output is inactive during power search.
Remote command:
Search Once - ALC
Forces the generator to execute level adjustment once, although the "Sample & Hold"
mode is active.
RF Block
