Rohde & Schwarz SMU200A - LF Generator and LF Output - Mod Gen

Instrument Function
R&S
®
SMU200A
246Operating Manual 1007.9845.32 ─ 15
Polarity
(External Source only)
Selects the polarity of the modulation signal.
"Normal"
The RF signal is On while the level is high at the modulation input.
"Inverted"
The RF signal is Off while the level is high at the modulation input.
SCPI command:
[:SOURce<hw>]:PULM:POLarity on page 772
5.5.12 LF Generator and LF Output - Mod Gen
5.5.12.1 LF Generator Overview
The internal LF generator is available as the internal source for the analog modulations
AM, FM / PM and Pulse, and also as the signal source for the LF output at the rear of the
instrument.
The frequency setting for the LF generator can be made both in the modulation menus
and in the "LF Output" menu. A change to the frequency of the LF generator automatically
has an effect on modulation if the LF generator is selected as the modulation source (i.e.
"Internal" is selected as "Source").
With two-path instruments, the frequency setting is always effective for both paths since
an LF generator is available for both paths in the instrument.
The LF Sweep mode is activated in the "LF Sweep" dialog (see chapter 5.5.13.4, "LF
Frequency Sweep", on page 261). "RF frequency" and "RF Level" sweeps are activated
in the respective menus of the RF block.
5.5.12.2 LF Output
To open the "LF Output" dialog, select "RF/A Mod > Configure > LF Output" or use the
MENU key under "RF/A Mod".
The combined menu "LF Output / LF Frequency Sweep" provides access to the LF output
configuration in the bottom section. The top sections provide access to the LF Sweep
mode settings, see chapter 5.5.13.4, "LF Frequency Sweep", on page 261.
LF Output Menu
State - LF Output
Activates/deactivates the LF output. This setting has no effect on the modulations.
RF Signal and Analog Modulations - RF Block