It could be the way AutoCad saved it. What does it look like when viewed in Adobe Reader or Adobe Acrobrat?
Thanks a lot for your answer. No autocad is not the problem and it comes out fine in Adobe. I also tryed it on Illustrator and the scale came out fine. So I still don't know what the problem is.
If you click when you use the Place cursor, it places the graphic at 100% of its original size. If you drag when you use the Place cursor, it will be scaled.