Instrument Function
R&S
®
SMBV100A
201
Operating Manual 1407.6062.32 ─ 08
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 level is ON while the level is LOW at the modulation input.
SCPI command:
5.4.13 LF Generator and LF Output - Mod Gen
5.4.13.1
Overview of LF Generator
An LF generator providing sinusoidal and square signals in the frequency range 0.1 Hz
to 1 MHz is available for the basic unit without additional equipment options.
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 dialogs
and in the "LF Generator / Output" dialog. The settings are effective for all modulations
using the internal modulation source.
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").
The LF Sweep mode is activated in the "LF Frequency Sweep" dialog (see
ter 5.4.14.4, "LF Frequency Sweep"
, on page 221). "RF frequency" and "RF Level"
sweeps are activated in the respective dialogs of the RF block.
The option Pulse Generator (R&S SMBV-K23) enables the generation of single and dou-
ble pulse signals.
The generator is activated and configured in the "Pulse Generator" dialog of the "Mod
RF/A Mod" block or in the "Pulse Modulation" dialog ("Pulse Generator" is selected as
Source).
5.4.13.2
LF Output
To open the combined "LF Frequency Sweep / LF Output" dialog, select "RF/A Mod" >
"Configure" > "LF Generator / Output" or use the MENU key under "RF/A Mod".
To open the "LF Generator / Output" dialog, select "RF A / MOD" > "Configure" > "LF
Generator / Output" or use the MENU key under "Mod Gen".
The "LF Output" dialog provides access to the configuration of the internal modulation
generators. In addition, the LF output is configured in this menu. The available settings
depend on the source selected and on the installed options.
In the upper section of the menu, the LF output is switched on. The configuration of the
internal source is performed in the lower section of the "LF Output" menu or in the indi-
RF Signal and Analog Modulations - RF Block
Summary of Contents for SMBV100A
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