Time Domain Reflectometers (TDRs) A time domain reflectometer works by sending a signal pulse down a cable and measuring the reflections that bounce back from any impedance change along its length an open circuit, a short, a bad splice, or even a sharp physical bend can all create a detectable reflection. By measuring the time it takes for the reflection to return, a TDR can calculat... https://jonard.com/network-it/test-equipment