Analog Modulations
R&S
®
SMA100B
75User Manual 1178.3834.02 ─ 05
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The settings of the modulation signal affect all analog modulations that use an
internal modulation source.
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You can feed an external LF signal in each of the two paths.
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Using exponential amplitude modulation with an external source, sets the coupling
of the corresponding input automatically to DC.
See also Chapter 4.4.6.2, "Source > External Settings", on page 102.
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If you use Scan AM with an external modulation input signal, the voltage range is
adjusted to +/- 6 V (usually +/-1 V). Therefore, we recommend that you do not use
the external modulation signal for FM or PhiM in parallel, since the voltage will
affect the modulations.
●
The amplitude modulation types linear and exponential derive the carrier signal
either linear in percent / volt, or as complex exponential in dB / volt.
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Scan AM provides the scan mode, i.e. an amplitude modulation depth with an
extended dynamic range that automatically uses the exponential amplitude modu-
lation type.
For more information, see data sheet.
4.3 Activating Analog Modulations
► Use one of the following:
● Select "Modulation > Amplitude Modulation/Frequency Modulation/Phase Mod-
ulation > State > ON".
● Select "Modulation > MOD ON".
● Press the [Mod on/off] key.
[Mod on/off]
Activate one or more analog modulations and press the [Mod on/off] key to toggle the
state of them all.
Pressing the key again restores the status that was active before the last switch-off.
Remote command:
[:SOURce<hw>]:MODulation[:ALL][:STATe] on page 512
4.4 Modulation Settings
Access:
► Select "Modulation" > "Modulation Sources".
The "Modulation" dialog contains all functions and settings to configure the analog
modulations, the LF signal sources for performing a modulation, and the LF signal
output.
Modulation Settings
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