Hi Sophie
my email address is made of the following.
my name completely with a dot between first and last name
then after that it is at gmail with its com extension
I'm not writing it here for automatic machines that find email addresses by scanning these forums.
If you find out how to write it I will reply.
About generating a datafile during the test and having multiple columns is not difficult.
Put the data write in the case where you add the data to the shiftregisters and use append data in the file write vi.
play arround with generating one string for each line in the file.
Use format into string with e.g. 3 inputs and test that in a separate vi, to see the result without having to run the data acquisition.
greetings from the Netherlands