Configuring the internal baseband source
R&S
®
SMM100A
99
User Manual 1179.1341.02 ─ 05
Figure 4-8: Trigger mode armed retrigger
* = Internal trigger event (to simplify the description)
Impact of the additional trigger settings
The R&S
SMM100A provides a set of settings to configure the behavior upon receiving
of a trigger signal. For example:
●
Suppressing trigger events
●
Delaying the instrument's response on trigger events
●
Adjusting the signal calculation start time in relation to the trigger event.
Avoiding accidental trigger events
The following trigger settings enhance the flexibility of the trigger system and can help
to avoid accidental trigger events.
●
"Threshold Trigger Input"
Defines the voltage level of the trigger signal where the R&S
SMM100A generates
a trigger event. Trigger signals below the trigger threshold are ignored.
●
"Trigger Input Slope"
Specifies the edge (rising or falling edge) of the trigger signal that is to provide the
trigger event.
●
"Impedance Trigger Input"
Specifies the input impedance of the trigger signal.
Starting the signal generation with the first sample
By default, the instrument starts the signal calculation simultaneously with the receiving
of the external trigger event. Because of the signal propagation time and the instru-
ment’s processing time, the first samples are cut off and no signal is output.
This default behavior, however, can cause problems if short signal sequences are gen-
erated. To overcome this problem, the instrument provides the special parameter
"Sync. Output to (External) Trigger". If this parameter is disabled, the signal output
begins after elapsing of the processing time and starts with sample 0. That is, the com-
plete signal is output (compare both figures in
Common functions and settings in the baseband domain
