Ni 9215 Voltage measurement

[kohurkarthik1]

Hello, I'm trying to measure voltages with the NI 9215 card. If i connect a battery to any channel I get the correct Voltage measurement however, if i try to read the data from a channel with no battery connected, i either get a value of -10.37V or some random value. Shouldn't the card read 0V?

Thanks

Karthik 

[kohurkarthik1]

never mind, found the answer in another post

http://forums.ni.com/t5/Multifunction-DAQ/NI-9215-input-signal-voltage/m-p/1887713/highlight/true#M6...