National Instruments NI 9239, Getting Started Manual

Page: 17 / 23

Table 1. Signal Descriptions
Signal Description
AI+ Positive analog input signal connection
AI- Negative analog input signal connection
Grounded Connections
NI 9239
Signal
Source
AI–
+
–
AI+
Make sure the voltage on the AI+ and AI- connections are in the
channel-to-earth safety voltage range to ensure proper operation.
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