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© National Instruments Corp. 5 NI 9225E Operating Instructions and Specifications
You can connect ground-referenced or floating signal sources to
the NI 9225E. Connect the positive signal of the signal source to
the AI+ terminal, and connect the negative signal of the signal
source to the AI– terminal. If you make a ground-referenced
connection between the signal source and the NI 9225E, make sure
the voltage on the AI+ and AI– connections are in the
channel-to-earth safety voltage range to ensure proper operation of
the NI 9225E. Refer to the Specifications section for more
information about operating voltages and overvoltage protection.
Note You must use 2-wire ferrules to create a secure
connection when connecting more than one wire to a
single terminal on the NI 9225E.
Refer to Figures 3 and 4 for illustrations of how to connect
grounded and floating signal sources to the NI 9225E.