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Problem is, even with a PIC with a 40Mhz clock, the quickest interval you can measure is 100nS. In the cable i'm using, signals travel at 71% the speed of light. Which means 100nS equates to 56.8m. Obviously thats nowhere near the resolution required. To measure within 1m i'd need a clock speed of 2.2GHz - Obviously not going to happen on a pic.
Im wondering how the hand-held cable testers manage that kind of timing.
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Not sure if this will work as the resistance will be low on a short cable, but this might be a place for RCTIME.
Known capacitance find the resistance. Calculate for wire diameter.
Dave
Always wear safety glasses while programming.
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