National Instruments NI 9229, NI 9239

The NI 9229/9239 has four 2-terminal detachable screw-terminal

connectors.

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 9229/9239.

You can connect ground-referenced or floating signal sources to

the NI 9229/9239. Connect the positive signal of the signal source

to the AI+ terminal or connector, and connect the negative signal

of the signal source to the AI– terminal or connector. If you make

a ground-referenced connection between the signal source and the

NI 9229/9239, 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 NI9229/9239. Refer to the

Specifications section for more information about operating

voltages and overvoltage protection. Refer to Figures3 and 4 for

illustrations of how to connect grounded and floating signal

sources to the NI 9229/9239.