I'm thinking of trying to make an impedance probe thing for my xschem workflow. Here's my idea: • I'll add impedance_probe.sym in the middle of a wire I want to test. • Normally, it behaves as a 0 ohm resistor. • I'll make a launcher.sym which adds a loop around the body of the control block in the generated netlist file ◦ The loop will rerun the analysis n times -- where n is the number of impedance probes -- each run will have one probe as 1 ohm instead of 0 ohms • Then (somehow??) the probe symbol gets this data from the raw file and tells you what the impedance of the line is Any chance that will work? Is this a reasonable way to do it at all? How do the pros know impedances? (@Stefan Schippers)