Rohde & Schwarz SMM100A, User Manual

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Configuring the internal baseband source
R&S
®
SMM100A
96 User Manual 1179.1341.02 ─ 05
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Trigger settings in the dialogs of the firmware options
Impact of the trigger modes on the signal generation
A trigger event affects the signal generation in different way, depending on the selected
trigger mode. The
Table 4-3 gives an overview of the provided trigger modes and their
impact.
Table 4-3: Impact of the trigger events on the generated signal
"Trigger Mode" Signal generation
mode
1)
1st Trigger event
"Exec. Trigger" or
"External" trigger signal
Subsequent trigger event
"Exec. Trigger" or
"External" trigger signal
Trigger event
"Arm"
"Auto"
See Figure 4-5
Continuous - - -
"Retrigger"
See Figure 4-6
Continuous Initial start Restart -
"Armed_auto"
See Figure 4-7
Continuous Initial start Restart
(only after previous "Arm")
Stop
"Armed_retrigger"
See Figure 4-8
Continuous Initial start Restart Stop
"Single"
See Figure 4-4
Single
length determined by
"Trigger Signal Duration"
Initial start Restart -
1)
The instrument generates a continuous signal or a single signal.
●
Single signal generation means that the signal generation stops after one cycle.
That is, after the signal with signal length determined by the "Trigger Signal Dura-
tion" has been generated.
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Continuous transmission means that the signal is generated repeatedly without
delay and until the data generation is stopped explicitly.
However, any parameter change within the processing chain (baseband, fading
simulator, or stream mapping) causes a signal generation restart.
The following is a list of the trigger modes together with their short description. An
example of their impact on the generated signal is given. The provided examples are
intended to show the triggering mechanism in principle. To simplify the description, an
internal trigger event ("Execute Trigger") is used. An external trigger event has the
same effect on the signal generation. In the examples on the figures bellow, the instru-
ment's processing time is ignored.
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Single
The instrument starts the signal generation only when a trigger event occurs. The
signal is generated once. Its signal length is set with the parameter "Trigger Signal
Duration".
Every subsequent trigger event causes a restart.
Common functions and settings in the baseband domain