Recommended · for some experience

#323: Measure length of coax, etc. with your scope, a battery and a resistor - simple TDR

w2aew

Why people recommend it

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.

Watch for: Needs a scope with a high sample rate

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