Not exactly - a normalized vector has one axis that's 1 m. long. ar81's tool really is made to be used in conjunction with his Mesh Wizard. From his Mesh Wizard tutorial -

"When you need to state the DIR and ROT vectors for docking ports, attachment and grapple points, finding a ROT vector that is perpendicular to your DIR vector is not an easy task, if you are not familiar with vector math and if DIR vector is not along any of the XYZ axis.

On top of that, DIR and ROT vectors are normalized, so you need some extra work to do.

That's why this feature was implemented, so you can calculate your ROT vectors with no big effort"

"If you have a DIR vector and you have defined a preliminary ROT vector, both vectors will form a plane.

What the calculator will do is to find the ROT vector that is perpendicular to your DIR vector along that plane.

So basically it corrects your original preliminary ROT vector to find a perpendicular one."

I find the Rot Vector tool of Mesh Wizard in conjunction with Vector Normalizer to work pretty well, but it usually takes me 3 to 5 readings before I get it right. A nice feature of the Rot Vector Tool is after you get your 3 axis entered in, Mesh Wizard will draw a vector showing you where the rotation you've defined is.