I would suggest using the intermediate file i/o vi's. Open a reference to a file outside your loop and then using the write function write a tab or comma delimited string with and end of line constant. This will then create a new row each iteration. Outside your loop close the reference to the file. If you use the write to spreadsheet function you will be opening the file and closing the file each iteration of the loop. This can prove to be costly. Hope this helps.
BJD1613
Lead Test Tools Development Engineer
Philips Respironics
Certified LV Architect / Instructor