I can't look at your code right now, but it sounds like the acquisition VI is returning a waveform, but you want to simply save two columns: one with a relative time starting at zero and one column of the data. Correct so far?
On the waveform palette are nodes for extracting the three values contained in a waveform: T0, deltaT and Y(). The first two values are DBLs and the third is an array of DBLs.
The two you are interested in is the deltaT and Y() -- the later of which is the actual data. Y() will be your second column data. You will have to synthesize the first column.
To generate the first column data, and put your data in the right format for saving, place a FOR loop on the block diagram and put a build array function inside the loop. By default, the build array will have two inputs. Wire the Y() array through the wall of the loop to the bottom terminal on the build array.
Place a multiply primitive in the loop and wire its output to the top terminal on the build array. Wire the loop's iteration counter to one input of the multiply and deltaT to the other.
Now wire the output from the build array out of the loop, and note that it turns into a 2D array where column 0 is a relative sample time and column 1 is a data value.
Write this array to a text file (write to spreadsheet file.vi should do nicely) and you are done.
Mike...
