8 Trigger
8.1 Trigger
Measurements other than Swept SA:
:TRIG:<meas>:SOUR PXI
Annunciation PXI (in the Meas Bar)
8.1.1.19 Internal
When Internal is selected, the trigger condition is met when detecting the signal
from the internal RF Source module.
This trigger type is only found in the modular instrument products.
The Trigger tab contains the following Trigger Source dependent controls when Aux
I/Q Mag Trigger is selected:
–
"Prot Frame Aligned" on page 2660
–
"Trigger Delay" on page 2663
–
"Trigger Slope" on page 2667
Additional controls are also present that are not dependent on the selected Trigger
Source.
For an Internal trigger to occur, there must be a trigger output from the internal RF
source. This means that you must configure the Source Trigger Output before
selecting Internal as the Trigger Source. To enable the Source Trigger Output,
output trigger should not be off if internal source works as list sequence mode and
Trig 2 Out should not be off if internal source works as MXG mode. Otherwise, no
trigger occurs, and measurement does not start.
Example Swept SA measurement:
:TRIG:SOUR INTernal
Measurements other than Swept SA:
:TRIG:<meas>:SOUR INTernal
Annunciation Internal (in the Meas Bar)
8.1.1.20 Prot Channel Detection
Selects a protocol channel detection Base Station Emulation as the trigger. When
Prot Channel Detection is selected, a new sweep/measurement will start when the
protocol channel detection trigger condition is met.
Protocol Channel Detection Trigger is defined as the Base Station Emulation
protocol channel detection event of PUSCH, PUCCH, PRACH or SRS. With this
trigger, the IQ data, and therefore the measurement, is aligned at the beginning of
the LTE sub-frame where the particular event was detected. Channel transmission is
2659 Spectrum Analyzer Mode User's &Programmer's Reference
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