Then you work with a measurement bridge. You measure voltage differences. Most AD equipment is voltage sensing and have a high input impedance. It may be that you have have 200mA current through your bridge. But this is not the same as you will have this current floating into your AD unit. Shall the bridge also be controlled by Labview? I think it is best you draw a simple schematic of your measurement setup.

Besides which, my opinion is that Express VIs Carthage must be destroyed deleted
(Sorry no Labview "brag list" so far)