Instrument Function
R&S
®
SMC100A
149
Operating Manual 1411.4060.32 ─ 04
Displays the input sensitivity of the MOD EXT input in %/V.
The modulation depth entered under "AM Depth" is reached with 1 volt modulation of the
input.
SCPI command:
AM External Coupling
(Source External only)
Selects the coupling mode (AC or DC) for external feed.
Note:
Coupling for external feed via input MOD EXT is set for all modulations with external
source.
SCPI command:
External Input Impendance
(Source External only)
Selects the impedance for external feed via the EXT MOD input.
Selection 600 Ohm and high (>100 kOhm) is available.
Note:
This setting affects all analog modulations which use the external modulation
source.
SCPI command:
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.
5.4.3.1
Frequency Modulation Settings
To open the "Frequency Modulation" menu, select "Modulation > Configure > Frequency
Modulation" or use the MENU key under "Modulation".
In the upper section of the menu, the modulation source is selected and the modulation
is switched on. 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).
Modulations