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4.6. TDR (Time Domain Reflectometer) mode
4.6.1. Theory
T
ime domain reflectometers are electronic instruments used for locating faults in
transmission lines.
A short electrical pulse is sent over the line, and then a reflected pulse is observed. By
knowing the delay between two pulses, the speed of light and the cable velocity factor,
the DTF (distance-to-fault) is calculated. The amplitude and the shape of the reflected
pulse give the operator idea about the nature of the fault.
Impulse response:
Instead of a short pulse, a “step” function may be sent over the cable.
Step response:
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