Instrument Function
R&S
®
SMB100A
170Operating Manual 1407.0806.32 ─ 13
5.4.2.1 Amplitude Modulation Settings
To open the "Amplitude Modulation" dialog, select "Modulation > Configure > Amplitude
Modulation" or use the MENU key under "Modulation".
In the upper section of the dialog, the modulation source is selected and the modulation
switched on. The modulation source can be selected independently for the different
modulation types and the LF output.
The configuration of the selected external and/or internal modulation source is performed
in the lower section of the dialog or in the "LF Output" dialog (internal source only).
These settings affect all modulations which use the same modulation source.
State
Activates/deactivates AM modulation.
Remote command:
[:SOURce<hw>]:AM:STATe on page 290
AM Source
Selects the source for the AM signal.
"Internal"
Selects the internal LF generator as the source for AM modulation.
"External"
Selects the external source.
The external signal is input via the MOD EXT connector.
"Intern +
Extern"
Selects the internal and external source at the same time, e.g. for per-
forming two-tone AM.
Note: This setting applies to linear AM, see "Exponentional AM (Instru-
ments with 12, 20, or 40 GHz frequency options)" on page 169.
Remote command:
[:SOURce<hw>]:AM:SOURce on page 290
AM Type
Selects between linear or exponential (logarithmic) amplitude modulation, if you work with
an instrument that is equipped with a 12 GHz, or higher frequency option.
Remote command:
[:SOURce<hw>]:AM:TYPE on page 291
AM Depth
Sets the modulation depth in percent.
Note: With two-tone modulation, observe that the set modulation depth is valid for both
signals and the sum modulation depth is determined by doubling the set modulation
Modulation
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