Final answer:
A TDR stands for Time Domain Reflectometer. It is a device used to measure the distance to a fault in a transmission line by sending a pulse and measuring the reflected signal.
Step-by-step explanation:
TDR stands for Time Domain Reflectometer.
It is a device used in physics and engineering to measure the distance to a discontinuity or fault in a transmission line.
By sending a pulse of electromagnetic energy down the transmission line and measuring the time it takes for the reflected signal to return, a TDR can determine the location and severity of a fault.