Chapter 4
Analog Input
X Series User Manual
4-28
ni.com
AI Sample Clock Signal
Use the AI Sample Clock (ai/SampleClock) signal to initiate a set of
meas
u
rements. Yo
u
r MIO X Series device samples the AI signals of every
channel in the task once for every AI Sample Clock. A meas
u
rement
acq
u
isition consists of one or more samples.
Yo
u
can specify an internal or external so
u
rce for AI Sample Clock. Yo
u
also can specify whether the meas
u
rement sample begins on the rising edge
or falling edge of AI Sample Clock.
Using an Internal Source
One of the following internal signals can drive AI Sample Clock:
•
Co
u
nter
n
Internal O
u
tp
u
t
•
AI Sample Clock Timebase (divided down)
•
A p
u
lse initiated by host software
•
Change Detection Event
•
Co
u
nter
n
Sample Clock
•
AO Sample Clock (ao/SampleClock)
•
DI Sample Clock (di/SampleClock)
•
DO Sample Clock (do/SampleClock)
A programmable internal co
u
nter divides down the sample clock timebase.
Several other internal signals can be ro
u
ted to AI Sample Clock thro
u
gh
internal ro
u
tes. Refer to
Device Routing in MAX
in the
NI-DAQmx Help
or
the
LabVIEW Help
for more information.
NI 6351/6353
*
1.25 MS/s
1 MS/s
NI 6361/6363
*
2 MS/s
1 MS/s
*
On NI 6351/6353/6361/6363 devices, the single channel rate is higher than the aggregate
rate beca
u
se while the ADC can sample at that rate, the PGIA cannot settle fast eno
u
gh to
meet acc
u
racy specifications.
Note
: Refer to Table 4-7 for Sim
u
ltaneo
u
s MIO X Series device analog inp
u
t rates.
Table 4-4.
Analog Input Rates for MIO X Series Devices (Continued)
MIO X Series Device
Analog Input Rate
Single Channel
Multi-Channel
(Aggregate)
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