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Operation Theory
4.2 A/D Conversion
When using an A/D converter, you must know about the properties
of the signal to be measured and decide which channel to use and
how to connect the signals to the card. Refer to section 2.3. In
addition, you should define and control the A/D signal
configurations, including channels, gains, and signal types.
The A/D acquisition is initiated by a trigger source and you must
decide how to trigger the A/D conversion. The data acquisition will
start once a trigger condition is matched.
After the end of an A/D conversion, the A/D data is buffered in a
data FIFO. The A/D data can now be transferred into the system’s
memory for further processing.
Software Polling and Scan Acquisition modes are discussed
below as well as timing, trigger modes, trigger sources, and
transfer methods.
PCI-9222/PCI-9223 AI Circuitry
Figure 4-2: PCI-9222/PCI-9223 AI Circuitry
Summary of Contents for NuDAQ PCI-9222
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