Some wire connection problem for SCB-68 usage in measuring voltage

I am using FPGA 7831R along with SCB-68 to measure some voltage from my monitor terminal from my motor. When I measure the voltage between the monotor output and GND using a multi-meter the measurement is very reasonable and it can be changed when motor speed is changed. However, When I use FPGA input function to measure the monitor output(corresponding AI0 on SCB-68), the number displayed on the scope is always 10. The displayed value from GND is also 10(corresponding AI1 on SCB-68), so when I substract  AI0 from AI1 the value is zero. Did I do something wrong in wire connection.
Should I connect the AIGND terminal to somewhere or leaving it floating.

Hi shuishen1983,
What are the connections that you have made for this measurement?  What kind of signal is it?  Are you trying to do a differential or single-ended measurement?  In either case, you should have a look at this wiring guide.
Jared S.
Applications Engineering
National Instruments

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