You can specify the height of text and dimensions in drawing units, mm or inches. If the text height is specified in:
drawing units, the text is scaled in layouts.
mm or inches it becomes annotative text, which is always drawn in the specified size on paper, regardless of scale.
In the following example, the text height is specified as 25 du (drawing units) for both text items and dimensions.
The drawing scale, as well as the layout scale, is 1:10.
Two viewports have been added at scales of 1:10 and 1:5 respectively.
Firstly the drawing:
And now the associated Detail layout with viewports at a scale of 1:10 (top) and 1:5 (bottom):
The text is scaled according to the viewport scale so that the text in the 1:5 viewport is twice the size of the text in the 1:10 viewport.
The following drawing is exactly the same as above, except that the text height for both the text entity and the dimensions have been specified as 2.5mm.
Using mm or inches as the units tells AllyCAD to print the text at a fixed size on paper regardless of scale.
The text and dimensions are printed at the same size of 2.5mm on paper regardless of the scale of the viewport.