I don't measure capacitance with TDR. I 'm gonna measure length of the cable then I put it into test. In
test I measure the "known" length of a cable then I'll check the length from the TDR, if lengths are not
match so I understand that there is a open circuit fault and tell the exact location. So according to you I
can't make that circuitry with arduino. How can I do that? Do I need osciloscope?