Getting started
R&S
®
SMM100A
52
User Manual 1179.1341.02 ─ 05
Figure 3-11: Block diagram: Generating a digitally modulated signal
3.3.3
Triggering the instrument with an external signal
The example configurations are rather theoretical cases, because you rarely use the
R&S
SMM100A as a standalone instrument. Usually, the instrument would be connec-
ted to a device under test (DUT) and/or other measurement equipment. As a rule,
whenever a test setup requires two or more devices, provide them with a common ref-
erence frequency. Some test setups require control of the signal generation start and
an exact generation start time, determined by a defined trigger event. For example, by
triggering the instrument internally or externally from the DUT.
This example illustrates the general principle of external triggering and extends the
configuration performed in
Chapter 3.3.2, "Generating a digitally modulated signal"
on page 50 by the configuration of the required trigger signal and connector settings.
This test setup requires one signal analyzer, like the R&S
®
FSW, as additional equip-
ment.
To start the signal generation synchronous to an external global trigger signal
The configuration requires three main steps with the following goals:
1. Observe the current connector configuration. Define an input connector for the
external global trigger signal.
See
"To verify the current connector configuration"
2. Configure the baseband to use this external global trigger signal as trigger source.
Trying out the instrument
