1 Theory of Operation: M31/M33XX Digitizers
Keysight M31XXA/M33XXA Digitizer User's Guide
11
1. 1. 3. 2 DAQ Trigger
As previously explained, the user can configure the trigger for the acquisition. The available trigger
modes for the DAQ are show in Table 7).
DAQ Trigger Mode
Programming Defin-
itions
Option
Description
Name
Value
Auto (Immediate) The acquisition starts automatically after a call to function
AUTOTRIG
0
Software / HVI
Software trigger. The acquisition is triggered by the function
DAQtrigger,
provided that the DAQ is
running. DAQtrigger can be executed from the user applic-
ation (VI) or from an HVI (see HVI details,
)
SWHVITRIG1 1
Hardware Digital
Trigger
Hardware trigger. The DAQ waits for an external digital trig-
ger
HWDIGTRIG 2
Hardware Analog
Trigger
Hardware trigger. The DAQ waits for an external analog trig-
ger (only products with analog inputs)
HWANATRIG 3
Table 7: DAQ trigger modes (parameter triggerMode in function DAQconfig,
)
As show in Table 7, the user has the following options for hardware triggers:
Hardware Digital Trigger: If the DAQ is set to use a digital hardware trigger, the
user must configure it using the function
DAQdigitalTriggerConfig (page 49)
.
The available digital hardware trigger options are shown in Table 8 and Table 9.
If external I/O trigger is selected in
g, the user must con-
figure additional settings of this particular I/O line, such as input/output dir-
ection, sampling/synchronization options, etc. (
).
Hardware Analog Trigger: (Only products with analog inputs) If the DAQ is set to
use an analog hardware trigger, the user must configure it using the function
DAQanalogTriggerConfig (page 50)
. The Analog Trigger Block of the cor-
responding analog input channel must also be configured.
DAQ Hardware Digital Trigger Source
Option
Description
Name
Value
External I/O
Trigger
The DAQ trigger is a TRG connector/line of the product (
). PXI form factor only: this trigger can be
synchronized to CLK10, see Table
TRIG_EXTERNAL
0
PXI Trigger
PXI form factor only. The DAQ trigger is a PXI trigger line
and it is synchronized to CLK10
TRIG_PXI
1
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