Chapter 4
Analog Input
©
National Instruments
4-61
X Series User Manual
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 4-33. 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.
Figure 4-33.
Halt (Internal Clock) and Free Running (External Clock)
Using a Digital Source
To
u
se AI Pa
u
se Trigger, specify a so
u
rce and a polarity. The so
u
rce can be
any of the following signals:
•
PFI <0..15>
•
RTSI <0..7>
•
PXI_STAR
•
PXIe-DSTAR<A,B>
•
Co
u
nter
n
Internal
O
u
tp
u
t
AI
Sa
mple Clock
AI P
aus
e Trigger
T
A
AI Extern
a
l
Sa
mple Clock
AI P
aus
e Trigger
H
a
lt. U
s
ed on Intern
a
l Clock
Free R
u
nning. U
s
ed on Extern
a
l Clock
T – A
AI
Sa
mple Clock
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