Instrument Function
R&S
®
SMB100A
149
Operating Manual 1407.0806.32 ─ 21
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:
field shows the current state of the filter.
"Manual"
In this mode, you can switch the filter individually.
Remote command:
State
Switches the filter in manual mode.
Note:
If you work in the "Auto"
, this parameter shows the current state of the fil-
ter. If you then change the state, the operation mode automatically turns to manual
operation.
Remote command:
:OUTPut<hw>:FILTer[:LPASs]:STATe
Attenuator Settings
The R&S
SMB can be configured to provide level settings without interruption. It is pos-
sible for instruments with or 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.
"Fixed"
When this operating mode is switched on, the attenuator, relays and
amplifier stages are fixed in their current positions to provide level
settings without interruption. The resulting variation range is defined
and displayed under "Attenuator Fixed Range".
Note:
The function is effective when automatic level control is activa-
ted ("ALC State = On").
If the normal variation range is overranged or underranged, level
errors increase considerably and the warning "Level under/over-
range" appears in the info line. The spectral purity of the output signal
decreases with high attenuation.
Remote command:
Fixed Range (PEP) In
Displays the level range in which the level is set without interruption for the "Attenuator
Mode fixed" setting.
RF Block
