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4-31
The timing engine ignores the AI Start Trigger signal while the clock generation is in progress.
After the clock generation is finished, the counter waits for another Start Trigger to begin another
clock generation. Figure 4-22 shows a retriggerable analog input with three AI channels and four
samples per trigger.
Figure 4-22.
Retriggerable Analog Input
Note
Waveform information from LabVIEW does not reflect the delay between
triggers. They are treated as a continuous acquisition with constant t0 and dt
information.
Reference triggers are not retriggerable.
Using a Digital Source
To use AI Start Trigger with a digital source, specify a source and an edge. The source can be
any of the following signals:
•
PFI <0..15>
•
RTSI <0..7>
•
Counter
n
Internal Output
•
PXI_STAR
•
PXIe_DSTAR<A,B>
•
Change Detection Event
•
AO Start Trigger (ao/StartTrigger)
•
DI Start Trigger (di/StartTrigger)
•
DO Start Trigger (do/StartTrigger)
The source can also be one of several other internal signals on your DAQ device. Refer to
Device
Routing in MAX
in the
NI-DAQmx Help
or the
LabVIEW Help
for more information.
You can also specify whether the measurement acquisition begins on the rising edge or falling
edge of AI Start Trigger.
Using an Analog Source
When you use an analog trigger source, the acquisition begins on the first rising edge of the
Analog Comparison Event signal.
AI
S
t
a
rt Trigger
AI
Sa
mple Clock
AI Convert
Содержание DAQ X NI 634 Series
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