Configuring the Internal Baseband Source
R&S
®
SMBV100B
101
User Manual 1178.4460.02 ─ 03
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
SMBV100B gener-
ates 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
Table 3-4: Impact of the parameter Sync. Output to (External) Trigger
"Sync. Output to (External) Trigger = On"
"Sync. Output to (External) Trigger = Off"
Suitable for long signal sequences
The output signal is synchronous to the trigger event
after elapsing of the internal processing time.
mode, this setting ensures that once
achieved, synchronization is not lost if the baseband
signal sampling rate changes.
See also
Chapter 8.3.1.2, "How to Connect and
Configure Instruments in Master-Slave Mode"
Suitable for triggering of short signal sequences with
signal duration comparable with the processing time
of the instrument
Suppressing and delaying trigger events
The main focus of the following features is the mobile communication standards.
Common Functions and Settings in the Baseband Domain
