11-2
|
ni.com
Chapter 11
Triggering
Triggering with an Analog Source
Some X Series devices can generate a trigger on an analog signal. To find your device triggering
options, refer to the device specifications.
Figure 11-2 shows the analog trigger circuit on MIO X Series devices.
Figure 11-2.
MIO X Series Device Analog Trigger Circuit
Figure 11-3 shows the analog trigger circuit on Simultaneous MIO X Series devices.
Figure 11-3.
Simultaneous MIO X Series Device Analog Trigger Circuitry
You must specify a source and an analog trigger type. The source can be either an APFI <0,1>
terminal or an analog input channel.
APFI <0,1> Terminals
When you use either APFI <0,1> terminal as an analog trigger, you should drive the terminal
with a low impedance signal source (less than 1 k
Ω
source impedance). If APFI <0,1> are left
unconnected, they are susceptible to crosstalk from adjacent terminals, which can cause false
triggering. Note that the APFI <0,1> terminals can also be used for other functions such as the
An
a
log
Inp
u
t
Ch
a
nnel
s
PGIA
–
+
ADC
M
u
x
An
a
log
Trigger
Detection
An
a
log Comp
a
ri
s
on
Event
(An
a
log Trigger
Circ
u
itry O
u
tp
u
t)
APFI <0..1>
AI Circ
u
itry
AO Circ
u
itry
Co
u
nter Circ
u
itry
DIO Circ
u
itry
An
a
log
Inp
u
t
Ch
a
nnel
s
NI-PGIA
+
–
+
–
ADC
ADC
M
u
x
An
a
log
Trigger
Detection
An
a
log Comp
a
ri
s
on
Event
(An
a
log Trigger
Circ
u
itry O
u
tp
u
t)
APFI <0..1>
AO Circ
u
itry
Co
u
nter Circ
u
itry
DIO Circ
u
itry
AI Circ
u
itry
NI-PGIA
Содержание 6368
Страница 1: ...PXIe 6368...
