The help for AIConfig vi has an error in the description. Its when you want to configure any channel for DC measurements or for Reference Single Ended measurements, without using the default values from MAX. From the context help, if you hop on to the detailed description, it shows that there is an input to the VI to indicates whether the 'coupling and input parametes' should be DC, AC, Ground or Internal reference. All these options are enumerated inside a box. In fact, the first option in the box should be 'Do not change input setting'. This is incorrectly placed outside the box. Thus when I wanted to use the DC coupling option I kept passing the value 0 to the vi whereas I should have been passing 1. The same holds for Differential, RSE, NRSE measurements.