Instrument Function
R&S
®
SMC100A
154
Operating Manual 1411.4060.32 ─ 04
Automatic Level Control is deactivated with pulse modulation!
When pulse modulation is activated, the ALC state of the R&S SMC is automatically
changed to "ALC OFF" ("Sample & Hold"). In this state, the ALC loop is opened and the
output level is not regulated but the level modulator is set directly. In order to set the
correct output level, a sample & hold measurement is executed after each frequency or
level setting.
The level is decreased by 30 dB during "Sample&Hold" measurement.
5.4.5.1
Pulse Modulation Settings
To open the "Pulse Modulation" menu, select "Modulation > Configure > Pulse Modula-
tion" or use the MENU key under "Mod".
In the upper section of the menu, the modulation source is selected and the modulation
switched on. The configuration of the selected external and/or internal modulation source
is performed in the lower section of the menu.
The menu varies according to the selected modulation source.
State
Activates/deactivates pulse modulation.
When the internal modulation source (pulse generator) is selected, the pulse generator
is switched on automatically and the video/sync signal is output at the PULSE VIDEO
output at the rear of the instrument. Signal output can be switched off in the "Pulse Gen-
erator" dialog (see
chapter 5.5.4, "Pulse Generator"
SCPI command:
Source
Selects the source for the pulse modulation signal.
"Pulse Genera-
tor"
Selects the Pulse Generator as modulation source.
The internally generated reactangular signal is used for the pulse mod-
ulation.
Modulations