Instrument Function
R&S
®
SMU200A
233Operating Manual 1007.9845.32 ─ 15
5.5.11 Analog Modulations
5.5.11.1 Overview
The R&S Signal Generator provides the analog modulations amplitude modulation (AM),
broadband amplitude modulation (BB-AM) and pulse modulation (Pulse) for the basic
unit (R&S SMU+ frequency option R&S SMU-B10x) without additional equipment options.
Two-path instruments require a second RF path (R&S SMU-B20x option).
However, the analog modulations frequency modulation (FM) and phase modulation
(PhiM) require option R&S SMU-B20 (FM/PhiM Modulator) or R&S SMU-B22 (FM/PhiM
Modulator and Low Phase Noise).
Settings for the modulation are made in separate modulation menus. These menus can
be accessed in the block diagram by way of the "RF/A Mod" function block, or by means
of the menu with the same name which is opened using the MENU key.
Enabling/Disabling Analog Modulations using the MOD On/Off Key
The MOD ON/OFF key switches the modulations on and off.
MOD ON/OFF
Press the MOD ON/OFF key to enable/disable analog modulations.
In the two-path mode, this key switches all modulations off.
Pressing the key again restores the status that was active before the last switch-off. "MOD
OFF" is displayed in the info line of the header next to the "Level" field.
SCPI command:
[:SOURce<hw>]:MODulation[:ALL]:STATe on page 759
Modulation Sources
The following modulations use internal and external modulation source:
●
Amplitude modulation
●
Pulse modulation
●
Frequency modulation
●
Phase modulation
Only external modulation sources can be used for a BB-AM.
Internal Modulation Sources
The LF generator is available as internal modulation source. The generator supplies
sinusoidal signals in the frequency range 0.1 Hz to 1 MHz. With pulse modulation, the
sinusoidal signal from the LF generator is formed internally into a rectangular signal used
to actuate the pulse modulator.
With two-path instruments, the frequency settings are always effective for both paths
since an LF generator is available for both paths in the instrument.
RF Signal and Analog Modulations - RF Block
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