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.

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5 NI 9225E Operating Instructions and Specifications