Instrument Function
R&S
®
SMB100A
125Operating Manual 1407.0806.32 ─ 13
The entry does not change the value of the RF level at the RF output. It only changes the
RF level displayed in the display header. The value of the RF level in the header corre-
sponds to the level at the output of the downstream instrument.
Remote command:
[:SOURce<hw>]:POWer[:LEVel][:IMMediate]:OFFSet on page 342
Low Harmonic Filter Settings
In 20 GHz or 40 GHz instruments (option R&S SMB-B120(L) /-B140(L)), it is possible to
install a low harmonic filter (option R&S SMB-B25 /-B26), in order to improve the harmonic
performance.
For a fitted low harmonic filter, you can define its operating mode in section "Low Har-
monic Filter" of the "RF Level / EMF" dialog. Otherwise, the section is hidden.
► To access the filter settings, select "RF > Config > RF Level > Low Harmonic Filter".
Mode
Selects between automatic or manual switching of the filter.
"Auto"
The filter switches automatically on and off, according to the given
operating conditions. It is active within a certain frequency and level
range and automatically turns off, if the frequency falls below the lower
limit, or the level exceeds the upper limit.
The corresponding limit values are given in the data sheet.
Note: The State field shows the current state of the filter.
"Manual"
In this mode, you can switch the filter individually.
Remote command:
:OUTPut<hw>:FILTer:AUTO on page 276
State
Switches the filter in manual mode.
Note: If you work in the "Auto" Mode, this parameter shows the current state of the filter.
If you then change the state, the operation mode automatically turns to manual operation.
Remote command:
:OUTPut<hw>:FILTer[:LPASs]:STATe on page 276
Attenuator Settings
The R&S SMB can be configured to provide level settings without interruption. This
applies to instruments with, as well as without step attenuator. The attenuator mode is
set in the "Attenuator Settings" section of the "RF level / EMF" dialog.
Attenuator Mode
Sets the attenuator mode at the RF output.
"Auto"
Standard mode.
RF Block
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