Batboard

Is it possible to use the 3920 as a TDR to measure cable impedance and find faults? If so, how? Thanks.

You can use the distance to fault app.

Or:
1) Switch on tracking generator
2) Connect antenna and gen port with a short cable and a T
3) Connect T to cable to test.
4) Compute distance between nulls in MHz
5) distance to fault = VelocityFactor*c/Freq*2

Distance to fault app?

Contact sales for more info, but IIRC there is an app for automating the process for you.