connection. The AI- terminal provides the excitation return path
and the signal ground reference.
Table 1. Signal Descriptions
Signal Description
AI+ Positive analog input signal connection
AI- Negative analog input signal connection
Connecting Signal Sources
You can connect ground-referenced or floating signal sources to
the NI 9230.
If you make a ground-referenced connection between the signal
source and the NI 9230, make sure the voltage on the AI+ and the
AI- connections are in the channel-to-earth safety voltage range
to ensure proper operation of the NI 9230. Refer to the device
datasheet on ni.com/manuals for more information about
operating voltages and overvoltage protection.
14 | ni.com | NI 9230 Getting Started Guide
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