Instrument Function
R&S
®
SMC100A
175Operating Manual 1411.4060.32 ─ 09
"DC"
Uses the modulation signal with both components, AC and DC.
Remote command:
[:SOURce<hw>]:FM:EXTernal:COUPling on page 289
Ext. Impedance
(Source "External" only)
Sets the impedance for the external modulation signal, applied at the MOD EXT con-
nector.
You can select 600 Ohm or high (>100 kOhm).
This setting affects all analog modulations which use the external modulation signal.
Remote command:
[:SOURce<hw>]:INPut:MODext:IMPedance on page 298
5.4.4 Phase Modulation (PhiM)
It is not possible to use phase modulation simultaneously with frequency modulation.
See "Simultaneous Operation of Several Modulations or Other Operating Modes"
on page 170 for an overview in detail.
An internal or external source can be selected for phase modulation. The LF GEN
modulation generator is available as the internal source.
The MOD EXT input connector for external feed of analog modulation signals is at the
front of the instrument. The coupling mode of the input (AC or DC) and the impedance
can be selected.
5.4.4.1 Phase Modulation Dialog
To open the "Phase Modulation" dialog, select "Modulation > Configure > Phase Modu-
lation" or use the MENU key under "Modulation".
In the upper section of the dialog, the modulation source is selected and the modula-
tion switched on. The modulation source can be selected independently for the differ-
ent modulation types and the LF output.
Modulation
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