Instrument Function
R&S
®
SMC100A
173Operating Manual 1411.4060.32 ─ 09
5.4.3 Frequency Modulation (FM)
An internal or external source can be selected for frequency modulation. The LF GEN
modulation generator is available as the internal source.
The MOD EXT input connectors for external feed of analog modulation signals are at
the front of the instrument. The coupling mode of the input (AC or DC) can be selected.
It is not possible to use frequency modulation simultaneously with phase modulation.
See "Simultaneous Operation of Several Modulations or Other Operating Modes"
on page 170 for an overview in detail.
5.4.3.1 Frequency Modulation Settings
To access the "Frequency Modulation" dialog, select "Modulation > Configure > Fre-
quency Modulation" or use the MENU key under "Modulation".
In the upper section of the dialog, you can select the modulation source and activate
modulation. The modulation source can be selected independently for the different
modulation types and the LF output.
The configuration of the selected external or internal modulation source is performed in
the lower section of the menu or in the "Mod Gen" block (internal source only).
These settings affect all modulations which use the same modulation sources.
State
Activates frequency modulation.
Activation of FM deactivates phase modulation.
Remote command:
[:SOURce<hw>]:FM:STATe on page 291
FM Source
Selects the source for the FM signal.
"Internal"
Uses the internal LF generator as modulation signal source for FM.
"External"
Uses an externally applied modulation signal.
The external signal is input via the MOD EXT connector.
Modulation
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