This video explains impedance in PCB design and how to measure it using a TDR. The author warns against connecting the TDR to the output of the circuit, as this could cause damage.
The TDR is a tool used to measure the electrical environment a signal sees, and is particularly useful for identifying discontinuities in a circuit. This video explains how to use a TDR to measure the impedance of PCB tracks. This is important for verifying the impedance of PCB lines and for designing systems that meet performance requirements.