Annotation Scale is a tool to scale your annotations like text and dimensions in order to display them at correct size on sheets. It is a special scale that affects only annotations, a powerful tool that provides you the capability of changing annotation sizes as necessary. Annotation scale can be used to ensure readability of annotations on sheets of any scale. For this reason, it is sometimes referred to as sheet scale.
In drawings, for annotations we always need to think about the scale at which is going to be printed. In earlier days (when Annotation Scale was not available), while placing annotations you had to think about the annotation sizes and had to scale them manually. But once they were placed, modifying them became tedious job, as you had to repeat the entire process. Now annotation scale makes it very simply. Annotation Scale allows you to change display sizes of all annotations with one click.
What is an Annotation ? An annotation is an element that uses annotation scale. A dimension that uses annotation scale is an annotation. If it doesn't use annotation scale, it is not an annotation. The annotation status of an element can be set when the element is placed and can be changed thereafter, if necessary. While placing those elements, Annotation Scale lock in the Tool Settings dialog should be turned ON. This lock can be set from Settings>Locks>Annotation Scale.
Annotation-able Element Types
Setting Up Annotation Scale Annotation Scale is a property of the model. All annotations placed in that model will follow the model's annotation scale (Although possible, we don't recommend individual annotations to have different annotation scales).
Annotation Scale can be set through Model Properties dialog or Drawing Scale dialog.
Annotation Scale Uses
Annotation Scale basically does two things for you.
Scaling annotations, Scaling sheet boundary, Scaling border attachment.
List of Annotation Scales
The list of scale you see in the drop-down is accessed from Scales.def file stored in "..\WorkSpace\System\Data" directory. You can define new scales or can remove existing scales in that file. If a model uses a pre-existing annotation scale that no longer exists in Scales.def file, that scale will be displayed as CUSTOM scale.
Annotation Scale Keyins
Annotations in References
Prior to MicroStation V8i, you couldn't apply the active model's annotation scale to annotations in references. You had to activate the reference, scale the annotations manually and again deactivate. This long process is no longer needed. References now have a new property called Use Active Annotation Scale, which can make annotations in reference use active model's annotation scale. Thus all annotations of a sheet will be displayed at the same size, irrespective of whether they are on the sheet or in a reference model.
More blogs coming up, so be there...
After 8 Years this is quite useful in a dgn environment but the competitor autodesk is going further with annotation scaling with a lot more possibilities and the worse Microstation still does not support that enhanced technology based on DWG-files. So DWG-files with dwg annotation scaling can not be edited by Microstation in all circumstances.