U9361C/F/G/M RCal Measurement Guide                   79
Making Measurements
Using RCal as a Scalar Network Analyzer
20. Select Math Function to Log Difference.
Tip: You can also use the Trace Normalize function. Trace Normalize will 
allow for continual trace update as opposed to a mathematical trace 
operation on a static trace.
21. Select Trace > Trace 3 >View/Blank to View.
22. Select Marker > Properties tab > set Relative To Marker 2.