Chapter 4
Analog Input
©
National Instruments
4-53
X Series User Manual
co
u
nter is then loaded with the n
u
mber of posttrigger samples, in this
example, three.
Figure 4-29.
Typical Pretriggered DAQ Sequence
If an AI Reference Trigger (ai/ReferenceTrigger) p
u
lse occ
u
rs before the
specified n
u
mber of pretrigger samples are acq
u
ired, the trigger p
u
lse is
ignored. Otherwise, when the AI Reference Trigger p
u
lse occ
u
rs, the
sample co
u
nter val
u
e decrements
u
ntil the specified n
u
mber of posttrigger
samples have been acq
u
ired. For more information abo
u
t start and
reference triggers, refer to the
Analog Input Triggering
section.
Sim
u
ltaneo
u
s MIO X Series devices feat
u
re the following analog inp
u
t
timing signals:
•
AI Sample Clock Signal
*
•
AI Sample Clock Timebase Signal
•
AI Hold Complete Event Signal
•
AI Start Trigger Signal
*
•
AI Reference Trigger Signal
*
•
AI Pause Trigger Signal
*
Signals with an
*
s
u
pport digital filtering. Refer to the
PFI Filters
section
of Chapter 8,
PFI
, for more information.
Aggregate versus Single Channel Sample Rates
Sim
u
ltaneo
u
s MIO X Series devices have one ADC per channel so the
single channel maxim
u
m sample rate can be achieved on each channel. The
maxim
u
m single channel rate is the fastest yo
u
can acq
u
ire data on the
device from a single or m
u
ltiple channels and still achieve acc
u
rate res
u
lts.
Don't Care
0
1
2
3
1
0
2
2
2
AI Start Trigger
AI Reference Trigger
AI Sample Clock
Sample Counter
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