R&S SMA100B - Page 215

Improving level performance
R&S
®
SMA100B
215User Manual 1178.3834.02 ─ 09
Settings
Mode........................................................................................................................... 215
Step Attenuator below 20 GHz....................................................................................215
Level Range................................................................................................................215
RF OFF Mode............................................................................................................. 215
Mode
Determines the operating mode of the step attenuator.
"Auto"
Adjusts the attenuator settings automatically.
"Fixed"
Fixes the attenuator and amplifier paths for the current RF level and
provides signal output with constant output VSWR. The resulting level
range is indicated under "Level Range" on page 215.
Remote command:
:OUTPut<hw>:AMODe on page 490
Step Attenuator below 20 GHz
Without option R&S SMAB-B36S only
Selects the type of the step attenuator for frequencies up to 20 GHz.
This setting depends on the frequency range and the installed high power options, see
"About the attenuator" on page 213.
"Mechanical"
Selects that the R&S SMA100B uses the mechanical step attenuator
over the whole frequency range.
The mechanical attenuator is used even for lower frequencies, to
achieve a consistent level setting behavior for all frequencies. The
electronic step attenuator is disregarded.
Sweep Type > Ramp also requires a consistent level adjustment
behavior. Therefore, the R&S SMA100B automatically activates the
mechanical step attenuator and disables the selection of the elec-
tronic step attenuator.
"Electronic"
Selects that the R&S SMA100B uses the electronic attenuator as
long as the frequency is below 20 GHz, providing benefits regarding
setting time and wear.
Remote command:
[:SOURce<hw>]:POWer:ATTenuation:PATTenuator on page 685
Level Range
Shows the interruption-free range of the level that you can use in the selected mode.
Remote command:
:OUTPut<hw>:AFIXed:RANGe:LOWer? on page 492
:OUTPut<hw>:AFIXed:RANGe:UPPer? on page 492
RF OFF Mode
Determines the state of the step attenuator, when the RF signal is switched off.
The setting is not affected by an instrument preset ([Preset] key or *RST) and the
"Save/Recall" function. It is reset only by factory preset.
Attenuator