R&S SMB100A, Operating Manual

Page: 165 / 528

Instrument Function
R&S
®
SMB100A
150 Operating Manual 1407.0806.32 ─ 21
Remote command:
:OUTPut<hw>:AFIXed:RANGe:UPPer?
on page 312
:OUTPut<hw>:AFIXed:RANGe:LOWer?
on page 312
RF OFF 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 .
"Unchanged" Freezes the setting of the attenuator when RF is switched off. The
attenuator is only activated when RF is switched on.
This setting is recommended if a constant VSWR (
V oltage S tanding
W ave R atio) is required.
Furthermore, on instruments equipped with a mechanical attenuator,
it provides fast and wear-free operation.
"Full Attenuation"
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.
Remote command:
[:SOURce<hw>]:POWer:ATTenuation:RFOFf:MODE
on page 378
User Variation
If the level is set using the rotary knob, the step width is defined in the "User Variation"
section.
Variation Active
Activates the user-defined step width used when varying the level value with the rotary
knob.
"ON" The level value set with the rotary knob is varied using the user-
defined step width which is entered under "Variation Step".
"OFF" The level value set with the rotary knob is varied in steps of one unit
at the cursor position (standard operating mode).
Remote command:
[:SOURce<hw>]:POWer:STEP:MODE
on page 386
Variation Step
Sets the user-defined step width for entering the RF level using the rotary knob. Level
variation with this step width must also be activated with "Variation Active".
Remote command:
[:SOURce<hw>]:POWer:STEP[:INCRement]
on page 386
External Level Adjustment
The external level adjustment provides information about the data that has been used
for calibrating the RF level.
RF Block