The reference measurement can be selected either from file or from the measurements available in memory.
If you want to select the measurement from file, first
check , then click the
button to open the browser. Note
that the selected file is not added to the memory measurement file list.
If the measurement is selected from memory as shown in the
figure above, it is possible to update the reference measurement when a new
measurement is performed by checking . See Plot->Plot
Type/Routing/Test... on how to set-up the routing.