I use the write to measurement file VI to save 5 values + a comment to a file. The VI is in a loop. The VI adds new values to the same file every time it is called. In one of the tutorials it is said "VIs can be more efficient if you avoid opening and closing the same files frequently". I understand that; the write to measurement file VI does open and close the same file every time it is called.
I want the VI called every second to save new data. Tests I did with this rate did show problems. However, what is meant by frequently? Every second? Every millisecond? So my question is: is saving every 1 second, like I want, likely to cause problems, or isn't that time period hardly a problem? Or is there a better solution (although this VI gives me all possibilities I want, including saving a comment and saving to multiple files with nice filenames; I would really like to use this VI).