Instrument Function
R&S
®
SMC100A
172Operating Manual 1411.4060.32 ─ 09
"External"
Uses an externally applied modulation signal.
The external signal is input via the MOD EXT connector.
Remote command:
[:SOURce<hw>]:AM:SOURce on page 279
AM Depth
Sets the modulation depth in percent.
Remote command:
[:SOURce<hw>]:AM[:DEPTh] on page 278
LF Gen Freq
Sets the frequency of the LF generator.
This setting affects all analog modulations which use the LF generator as the internal
modulation source.
Remote command:
[:SOURce]:LFOutput<ch>:FREQuency on page 300
AM Sensitivity
Displays the input sensitivity of the externally applied modulation signal at the MOD
EXT input in %/V.
The modulation depth entered under AM Depth is achieved with 1 Volt modulation of
the input.
Remote command:
[:SOURce<hw>]:AM:SENSitivity? on page 278
AM External Coupling
Selects the coupling mode (AC or DC) for external feed.
Note: Coupling for external feed via input MOD EXT can be set independently for all
modulations using the external modulation signal.
"AC"
Disconnects the DC voltage component and uses only the AC com-
ponent of the modulation signal.
"DC"
Uses the modulation signal with both components, AC and DC.
Remote command:
[:SOURce<hw>]:AM:EXTernal:COUPling on page 278
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
Modulation
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