Annotation scale is used to determine text height or the overall scale of an annotation object.
The approach used to calculate an annotation scale depends on whether the object is placed in model space or on a layout.
When annotation objects are created in model space, the following must be considered:
The text height or scale of an annotation object in model space can be set to a fixed text height or be controlled by assigning the object an annotation scale. Annotation objects assigned a fixed text height or object scale remain proportionate in size to the current plot or viewport scale.
If the annotative property of an annotation object is enabled, the text height or scale of the annotation object adjusts based on the current drawing annotation or layout viewport scale with the result that it will remain at the same size automatically.
Annotation objects created in paper space on a layout should be created at full size because layouts are commonly plotted at a 1:1 scale. For example, text created with a height of 1/8” in paper space will be output at 1/8” unless a scale other than 1:1 is used to plot the layout.