Rohde & Schwarz SME02 - Switching On;Off Internal Level Control; Fig. 2-20 Menu LEVEL - ALC (Preset Setting)

RF Level SME
1038.6002.02 2.46 E-13
2.5.3 Switching On/Off Internal Level Control
Menu LEVEL-ALC offers access to settings for level control.
Level control can be deactivated and various bandwidths of the level control can be switched on.
Switching off level control (ALC STATE OFF) switches over the internal level control into a
sample-and-hold operation. In this operating mode, level control is automatically switched on for a short
period of time after every level and frequency setting, and then the level control is held at the value
achieved. Switching off the level control is used with multi-transmitter measurements to achieve a larger
intermodulation ratio.
Bandwidth setting influences the AM noise of the output signal. The bandwidth of the level control has
the same effect as a filter of the same bandwidth.
Menu selection: LEVEL - ALC
FREQUENCY
LEVEL
MODULATION
DIGITAL MOD
LF OUTPUT
SWEEP
LIST
MEM SEQ
UTILITIES
HELP
LEVEL
ALC
UCOR
EMF
STATE
SEARCH ONCE
BANDWIDTH
FREQ
100. 000 000 0
MHz LEVEL
- 30.0
dBm
OFF ON
AUTO 100k 500k Hz
Fig. 2-20 Menu LEVEL - ALC (preset setting)
STATE
ON Normal state. Internal level control is permanently switched on.
IEC-bus command SOUR:POW:ALC ON
OFF Internal level control is deactivated. In this state no AM and no digital
modulation with AM content is possible
.
IEC-bus command SOUR:POW:ALC OFF
SEARCH ONCE Ð
Manual short-time switching on of the level control for level calibration in the
ALC STATE OFF operating mode.
IEC-bus command SOUR:POW:ALC ON;ALC OFF