Chapter 4
Analog Input
X Series User Manual
4-38
ni.com
Using a Digital Source
To
u
se AI Reference Trigger with a digital so
u
rce, specify a so
u
rce and an
edge. The so
u
rce can be any of the following signals:
•
PFI <0..15>
•
RTSI <0..7>
•
PXI_STAR
•
PXIe-DSTAR<A,B>
•
Change Detection Event
•
Co
u
nter
n
Internal O
u
tp
u
t
•
DI Reference Trigger (di/ReferenceTrigger)
•
DO Start Trigger (do/StartTrigger)
•
AO Start Trigger (ao/StartTrigger)
The so
u
rce also can be one of several internal signals on yo
u
r DAQ device.
Refer to
Device Routing in MAX
in the
NI-DAQmx Help
or the
LabVIEW
Help
for more information.
Yo
u
also can specify whether the meas
u
rement acq
u
isition stops on the
rising edge or falling edge of AI Reference Trigger.
Using an Analog Source
When yo
u
u
se an analog trigger so
u
rce, the acq
u
isition stops on the
first rising edge of the Analog Comparison Event signal.
Routing AI Reference Trigger Signal to an Output Terminal
Yo
u
can ro
u
te AI Reference Trigger o
u
t to any PFI <0..15>, RTSI <0..7>,
PXI_Trig <0..7>, or PXIe-DSTARC terminal.
All PFI terminals are config
u
red as inp
u
ts by defa
u
lt.
AI Pause Trigger Signal
Use the AI Pa
u
se Trigger (ai/Pa
u
seTrigger) signal to pa
u
se and res
u
me a
meas
u
rement acq
u
isition. The internal sample clock pa
u
ses while the
external trigger signal is active and res
u
mes when the signal is inactive.
Yo
u
can program the active level of the pa
u
se trigger to be high or low, as
shown in Fig
u
re 4-24. In the fig
u
re, T represents the period, and A
represents the
u
nknown time between the clock p
u
lse and the posttrigger.
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