RF Level R&S®SML / R&S®SMV03
1090.3123.12 E-6 4.6
Switching On/Off Automatic Level Control (ALC)
Settings for automatic level control (ALC) can be made in the Level – ALC menu.
When level control is switched off (ALC State Off), switchover is made to a sample-and-hold mode. In
the sample-and-hold mode, level control is switched on automatically for a short time after each level or
frequency setting and the level control is held at the value attained. With the Learn table function called
up, a new table can be prepared. Level control OFF is used in multisource measurements to improve
intermodulation suppression.
Menu selection: Level – ALC
Fig. 4-5 Level - ALC menu (preset setting)
State
On Level control is switched on permanently.
IEC/IEEE-bus command :SOUR:POW:ALC ON
Off Level control is switched off. No AM is possible in this status.
IEC/IEEE-bus command :SOUR:POW:ALC OFF
Menu selection: Level - ALC
Fig. 4-6 Level - ALC - State Off
ALC Off Mode
Sample & Hold In the SAMPLE&HOLD mode the level is recalibrated after
each level or frequency setting. To do this,CW is selected for
a short period of time, level control is switched on and the
level control held at the value attained.
IEC/IEEE-bus command :SOUR:POW:ALC ON
Table In the ALC Off mode correction values are taken from a table.
IEC/IEEE-bus command :S
OU
R:POW:ALC OFF
Search Once
Lelvel control manually switched on for short time for levelchalibration in ALC
State Off mode.
IEC/IEEE-bus command :SOUR:POW:ALC ON
:SOUR:POW:ALC OFF
Learn Table
Correction values for the Table mode are regenerated.
IEC/IEEE-bus command :SOUR:POW:ALC:TABL:MEAS?
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