The tutorial How To Measure Voltage provides a good and thorough description of the different terminal configurations, and explains when to use them. For a short summary/overview continue below.
In general, it is recommended to use differential configuration when possible. Differential signal connections reduce noise pickup and avoid ground loops. The following chart summarizes ways to connect a signal source to a measurement system.
To find your device pinouts of your specific hardware, open NI Measurement and Automation Explorer (MAX) and follow the steps outlined in Where to Find NI-DAQmx Device Pinouts or Pin Mappings.
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