1 #323: Measure length of coax, etc. with your scope, a battery and a resistor - simple TDR
A w2aew how-to, offered as a cheap way to estimate cable length or find a fault with only an oscilloscope, a 9V cell and a single resistor.
Topic
cable testing
2 videos. Ranked by independent recommendations, not by views.
2 #177 Avoid Surprises: How good are USB cables and how can you test yours?
Pointed to for understanding why thin USB leads cause supply droop on boards like the Pi and ESP, and for how to measure a cable's quality.
