As I indicated before, it's pointless to always initialize and configure and close the instrument each iteration of the loop. Initialize, configure, and close outside of the loop. The only thing you need inside the loop is just the reading part.
The writing of the column headers for the table also does not need to be done each time through the loop.
You've hard-coded the writing of the first row, but you have a channel list control. So, is the channel list fixed, or is it user selectable? If it's the latter, then the first row of the output file must match what the channel selection list is. That's the point of the code that creates the column headers for the table indicator.
