Chapter 4
Analog Input
X Series User Manual
4-54
ni.com
The total aggregate determines the maxim
u
m b
u
s bandwidth
u
sed by the
device. The total aggregate sample rate is the prod
u
ct of the maxim
u
m
sample rate for a single channel m
u
ltiplied by the n
u
mber of AI channels
that the device s
u
pport.
Table 4-7 shows the single channels and total aggregate rates for
Sim
u
ltaneo
u
s MIO X Series devices.
AI Sample Clock Signal
Use the AI Sample Clock (ai/SampleClock) signal to initiate a set of
meas
u
rements. Yo
u
r Sim
u
ltaneo
u
s 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
•
DI Sample Clock (di/SampleClock)
Table 4-7.
Analog Input Rates for Simultaneous MIO X Series Devices
Simultaneous MIO
X Series Device
Analog Input Rate
Single Channel
Total Aggregate
NI 6356
1.25 MS/s
10 MS/s
NI 6358
1.25 MS/s
20 MS/s
NI 6366
2 MS/s
16 MS/s
NI 6368
2 MS/s
32 MS/s
Note
: On Sim
u
ltaneo
u
s MIO X Series devices, each channel has an ADC so each channel
can be acq
u
ired at the maxim
u
m single channel rate.
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