"The time domain reflectometer (TDR) is an instrument that is often used to measure printed circuit board (PCB) test coupons and cable impedance. The TDR is also quite useful for measuring the inductance and capacitance of vias and component pads, probe tip capacitance and inductance, and even the parasitic inductance transceiver coupling capacitor. It is also a simple way to validate simulations or to extract your own model. High-end dedicated TDRs often include this capability, but even using a simple real-time oscilloscope-based TDR can produce these results, using a simple cursor measurement..."
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