Instrument Function
R&S
®
SMB100A
145
Operating Manual 1407.0806.32 ─ 21
5.3.5 RF Level
5.3.5.1
Overview of RF Level
Message "Level overrange/underrange"
If this message appears in the status line, the set level ("Level") is out of range (see
data sheet).
In this case, the signal level at the output can deviate from the set value.
The value of the RF level is displayed in the level field in the header of the display
("Level"). This field provides the direct input of the RF level value. Alternatively, you
can enter the level in the "Level/EMF/..." dialog.
Note that the displayed RF level in the header, and the RF output level, set in the
"Level/EMF" dialog can be different, as explained in the following section.
RF level vs. RF output level
If you are working with a downstream instrument, e.g. an attenuator or amplifier, you
can enter the related parameter value in the level settings dialog ("Offset").
The generator includes these parameters and displays the result in the "Level" field in
the status bar, as if the downstream instrument and the generator were one unit. This
displayed level value corresponds to the value at the RF output of the downstream
instrument. However, the level provided at the RF output of the signal generator corre-
sponds to the level value set in the "Level/EMF/..." dialog.
The instrument activates the "Level Offset" icon in the status bar, when a level offset is
set.
The correlation is as follows:
"Level" (in header) = "RF output level" (Level in menu) + "Level offset" (Offset in menu)
The RF output is protected against overloading by an external signal applied to the RF
output (see
Chapter 5.3.5.7, "Reverse Power Protection"
Setting the RF level
To change the RF level, press the LEVEL key and enter the desired level. Changes to
the RF level have an immediate effect (without confirmation with the Enter key) on the
output signal.
RF Block
