Rohde & Schwarz SMBV100A, Руководство по эксплуатации

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Instrument Function
R&S
®
SMBV100A
220 Operating Manual 1176.8016.02 ─ 17
The center line ("Level") and the peak envelope power ("PEP") of the modulated RF
output signal is displayed when digital modulation or digital standard signals are gener-
ated.
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 5.5.10, "Reverse Power Protection" , on page 240).
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 Level
Enters the RF level, considering the level offset (see "RF level vs. RF output level"
on page 220).
Note: Some SW options have specific requirements about the calculation of the level
of the output signal. E.g. the displayed value corresponds to the level at the start simu-
lation time, there are correction coefficients to be applied, etc. In this case, the dis-
played value in the header of the instrument does not always correspond to the level at
the RF output.
When working with a software option, always refer to the corresponding documentation
for related specific information.
RF Block