removing usb-6009 floating voltage

[mgbglasgow]

hello,

I have created a VI that logs 6 voltages from 6 seperate batteries, and all is well, until i disconnected one of the batteries and it stills sees approx 1.4 volts. how can i remove this offset(?)

Is it present on the connected readings?

Regards

Steven

[Al.C]

http://forums.ni.com/t5/Multifunction-DAQ/removing-usb-6009-floating-voltage/m-p/2808962#M81637