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Chapter 4
Analog Input
AI Sample Clock Signal
Use the AI Sample Clock (ai/SampleClock) signal to initiate a set of measurements. Your
Simultaneous MIO X Series device samples the AI signals of every channel in the task once for
every AI Sample Clock. A measurement acquisition consists of one or more samples.
You can specify an internal or external source for AI Sample Clock. You can also specify
whether the measurement 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:
•
Counter
n
Internal Output
•
AI Sample Clock Timebase (divided down)
•
A pulse initiated by host software
•
Change Detection Event
•
Counter
n
Sample Clock
•
DI Sample Clock (di/SampleClock)
•
AO Sample Clock (ao/SampleClock)
•
DO Sample Clock (do/SampleClock)
A programmable internal counter divides down the sample clock timebase.
Several other internal signals can be routed to AI Sample Clock through internal routes. Refer
to
Device Routing in MAX
in the
NI-DAQmx Help
or the
LabVIEW Help
for more information.
Using an External Source
Use one of the following external signals as the source of AI Sample Clock:
•
PFI <0..15>
•
RTSI <0..7>
•
PXI_STAR
NI 6396
14.29 MS/s
*
114.29 MS/s
*
*
NI PXIe-6386/6396 devices support the listed analog input rates when using an internal clock. When
using an externally-derived clock, the maximum single channel analog input rate is 15 MS/s and the total
aggregate rate is 120 MS/s.
Note
: On Simultaneous MIO X Series devices, each channel has an ADC so each channel can be
acquired at the maximum single channel rate.
Table 4-8.
Analog Input Rates for Simultaneous MIO X Series Devices (Continued)
Simultaneous MIO
X Series Device
Analog Input Rate
Single Channel
Total Aggregate
Содержание 6368
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