Setting the Scale for Dimensions

To set dimension scale for creating dimensions in paper space

1. To make sure that Tile mode is set to 0, choose Paper Space from the View menu.
2. At the Command prompt, enter dim.
3. Enter dimlfac.
4. At the Current Value prompt, enter v (Viewport).
5. Select the viewport whose scale you want to use by clicking its border.
6. To create dimensions in paper space with the correct model space dimension values, use object snap modes to snap to points in model space from paper space. Dimensioning by object selection is not available in paper space, thus you need to use object snaps instead.

AutoCAD LT calculates the scaling of model space to paper space and assigns the negative of this value to the DIMLFAC dimensioning system variable.