Adding a Custom Annotation to a Point and Its Derived Width
Specify a single point of interest. Add an annotation between adjacent points derived from the single point.
As an example, add an annotation to indicate the -3 dB transmission bandwidth.
Select the trace where you want to read the derived width.
-
On the Cartesian
context tab, on the Measure tab, on the Custom annotations group, click the
Derived width icon.
Figure 1. The Annotation dialog. 
- Under Relative to the, click Global maximum.
- Under Place the annotation at, from the drop-down list select an offset of.
- [Optional] Under Text, clear the Auto text check box and add the text you want displayed in the annotation.
- Click Create to create the annotation and to close the dialog.