I was recently asked if I could locate the distance to a cable fault and I got the idea that the DSO nano could probably be used for this too with SING mode workning as requested to start with
The other thing that needs to be changed which might or might not be a easy task is to be able to send a single very short pulse with the test signal output.
The nano will trigger on the pulse sent out in SING mode and with the right time scale selected some echos should be visible on the screen. Echos will come from the wire end and/or at impedance changes troughtout the length of the cable. It should give you a picture of the quality of the whole cable length until the big echo comes from the cable end. By looking at this and measure the time (speed vary some with different cables, spec. often available from manufacturer) you could tell the distance to each fault or an open end.
Might be a good possible usage for the nano if it could be taught to send out single pulses?
PS. I know that there are expensive equipment available in stores that does this and which I have borrowed before but it was not the point with this post