17-2000 C
2020-09-17
27(50)
ADQ8-8C Manual
17-2000 C 2020-09-17
27(50)
4.11 Internal trigger
The internal trigger generates a periodic trigger signal. The internal trigger period is specified in number
of samples.
Note that if the internal trigger signal used as a trigger output, the actual output signal is updated at the
Data Clock rate. This may appear as jitter on the output. It is recommended to use a period that is a
multiple of the Data Clock is the internal trigger shall drive external equipment.
4.12 Trigger output
The trigger output signal is intended for triggering external equipment connected to the ADQ to build a
synchronized system. It can also be used for indicating that a trigger event occurred in the digitizer. The
trigger output is updated at the rate of the Data Clock.
The trigger output function consists of two parts:
•
The first part selects the source of the trigger output signal.
•
The second part selects the physical output port for the trigger output signal.
Note that the trigger output is the same physical TRIG connector as the external trigger input.
4.12.1 Trigger output port selection
The trigger output port is selected to one of these ports:
•
Trigger connector on the front panel. Note that the trigger output is the same physical TRIG con-
nector as the external trigger input.
•
PXIe backplane triggers,
.
•
MTCA.4 MLVDS triggers in the backplane,
.
The availability of these ports depends on the interface option for the digitizer.
#
DESCRIPTION
USER COMMAND
REF
a
The level trigger has a hysteresis function to avoid false triggering on
noise.
b
When the signal passes below the
RESET_LEVEL_CODE
, the ADQ may
trigger again.
c
Trigger position is the first sample above the trigger
LEVEL_CODE
d
Set the trigger
LEVEL_CODE
.
SetupLevelTrigger
e
Set the trigger
RESET_LEVEL_CODE
.
SetupLevelTrigger
Figure 18: Trigger reset level.
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