Instrument Function
R&S
®
SMC100A
169Operating Manual 1411.4060.32 ─ 09
Note:
It is recommended to switch off the display update for optimum sweep performance
especially with short dwell times (see Chapter 5.2.3.6, "Display Update", on page 87).
Remote command:
[:SOURce<hw>]:SWEep:POWer:DWELl on page 339
Ext. Trigger Input Slope
Sets the polarity of the active slope of an externally applied instrument trigger.
This setting affects the PULSE EXT/INST TRIG input (BNC connector at the rear of the
instrument).
"Positive"
activates the rising edge of the trigger signal.
"Negative"
activates the falling edge of the trigger signal.
Remote command:
[:SOURce]:INPut:TRIGger:SLOPe on page 298
5.4 Modulation
5.4.1 Overview of Modulation
Analog modulation is a method used to transmit information of an LF (Low Frequency)
signal in accordance with a second signal, typically one of a higher frequency. This is
done by varying one or more properties of a high frequency waveform, called the mod-
ulation or carrier signal, with the modulating signal that contains the information to be
transmitted.
The three key parameters of the modulation signal are the amplitude, phase and fre-
quency. These parameters are modified in accordance with the low frequency signal to
obtain the modulated RF signal.
The R&S SMC provides all the various types of modulation, such as:
●
AM (Amplitude Modulation)
●
FM (Frequency Modulation)
●
PhiM (Phase Modulation)
●
PULM (Pulse Modulation)
The basic unit (R&S SMC + frequency option R&S SMC-B10x) enables you to gener-
ate modulation signal (sine) without additional equipment options and provides als a
standard LF generator.
Settings for the modulation are made in separate modulation menus. These menus
can be accessed in the block diagram by way of the "Modulation" function block, or by
means of the menu with the same name which is opened using the MENU key.
Modulation
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