Instrument Function
R&S
®
SMC100A
179Operating Manual 1411.4060.32 ─ 09
Source
Selects the modulation signal source for pulse modulation.
"Pulse Generator"
Uses the pulse generator as modulation signal source.
Uses the internally generated rectangular signal pulse modulation.
"External"
Uses an externally applied modulation signal.
The external modulation signal is input via the PULSE EXT connec-
tor.
Remote command:
[:SOURce<hw>]:PULM:SOURce on page 328
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.
"Inverse"
The RF level is Off if the level is high at the modulation input.
Remote command:
[:SOURce<hw>]:PULM:POLarity on page 327
5.5 Modulation Generator and LF Output
5.5.1 Overview of LF Generator
The internal modulation generator of the instrument provides a sinusodial LF modula-
tion signal without additional equipment options. The corresponding key data, as for
example the frequency range, is specified under "Modulation sources" in the data
sheet.
You can use the internal LF signal as modulation signal source for the analog modula-
tions, as for example the amplitude modulation. The signal applies to all modulations
which are using the internal modulation signal. Therefore, any modification of the LF
signal impacts all currently active modulations immediately.
To configure the LF generator signal, see Chapter 5.5.2.1, "LF Output Dialog",
on page 180. However, you can also configure the LF signal directly in the settings
dialogs of the analog modulations.
An internal pulse generator enables you to generate single or double pulse signals,
see Chapter 5.5.4, "Pulse Generator", on page 186.
The R&S SMC also provides the configured LF signal at the corresponding output con-
nector, for example as modulation signal source for interconnected instruments.
5.5.2 LF Output
Modulation Generator and LF Output
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