I am not sure what Deknow means by "Calibrating" A table saw. Maybe he is thinking that any rule on the table saw is actually accurate as to distance from the blade. But Calibration is accuracy in measurements. Maybe he just made a bad choice in words. I think you will find more results for what I suspect he is advising if you search for Tune a table saw. In that I completely agree. In fact you should tune any woodworking equipment.
This may help you know just what to do.