Instrument Function
R&S
®
SMBV100A
260Operating Manual 1176.8016.02 ─ 17
As modulation signal, you can either use the signal of the internal pulse generator or
an externally supplied signal. In case of external source, the external signal is input via
the PULSE EXT connector at the rear of the instrument. In case of internal source, this
connector can be used as external trigger or gate signal input for internal pulse modu-
lation. The polarity and input impedance of the connector can be selected.
The pulse signal is output at the PULSE VIDEO connector at the rear of the instru-
ment.
Automatic Level Control is deactivated with pulse modulation!
When pulse modulation is activated, the R&S SMBV deactivates ALC automatically
("ALC OFF", i.e. switches to "Sample & Hold" state).
The "Sample & Hold" state opens the ALC loop, and disables the automatic control of
the output level. The level modulator is set directly.
However, to correct the output level, the R&S SMBV executes a "Sample & Hold" mea-
surement after each change of frequency or level settings.
The level is decreased by 30 dB during "Sample & Hold" measurement.
Pulse Modulation Settings
To open the "Pulse Modulation" menu, select "RF/A Mod > Configure > Pulse Modula-
tion" or use the MENU key under "RF/A 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.
In case of modulation source pulse generator, the settings for the pulse characteristics
and the trigger are provided in the "Pulse Generator" section of the "Pulse Modulation"
dialog. Option R&S SMBV-K23 provides extended features, for example generation of
double pulse or selection of trigger mode. For description of the pulse generator dialog,
see Chapter 5.5.13.4, "Pulse Generator", on page 269.
RF Block
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