R&S SMB100A - Page 393

Remote Control Commands
R&S
®
SMB100A
378Operating Manual 1407.0806.32 ─ 21
Parameters:
<State> ON | OFF | AUTO
ON
Internal level control is permanently activated.
OFF
Internal level control is deactivated; Sample & Hold mode is acti-
vated.
AUTO
Internal level control is activated/deactivated automatically
depending on the operating state.
*RST: AUTO
Example:
POW:ALC ON
activates automatic level control for RF output A.
Manual operation: See "State - ALC" on page 153
[:SOURce<hw>]:POWer:ATTenuation:RFOFf:MODE
<Mode>
Selects the attenuator mode, when the RF signal is switched off.
The setting of the RF OFF mode is not affected by an instrument preset (PRESET
key), *RST and the "Save/Recall" function. This parameter is influenced only by the
Factory Preset.
Parameters:
<Mode> UNCHanged | FATTenuation
UNCHanged
Freezes the setting of the attenuator when RF is switched off.
The attenuator is only activated when RF is switched on.
This setting recommended if a constant VSWR (Voltage Stand-
ing Wave Ratio) is required.
Furthermore, on instruments equipped with a mechanical attenu-
ator, it provides fast and wear-free operation.
FATTenuation
Sets attenuation to maximum when the RF signal is switched off.
This setting is recommended for applications that require a high
level of noise suppression.
*RST:
depends on instrument hardware
Example:
SOUR:POW:ATT:RFOF:MODE FATT
sets the RF OFF attenuator to maximum.
Manual operation: See "RF OFF Mode" on page 150
[:SOURce<hw>]:POWer:EMF:STATe <State>
Displays the signal level as voltage of the EMF. The displayed value represents the
voltage over a 50 Ohm load.
SOURce Subsystem