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TDR 10
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TDR 10 Reflectometer - Fault location on a telecommunication line |
A time domain reflectometer (TDR) is a measuring instrument used to characterize and locate faults in metallic cables (for example, twisted wire pairs, coaxial cables)
The technique is based on the fact that a pulse energy is reflected back to the instrument, when it passes by an high impedance change.
TDR 10
Reflectometer – Fault location on a telecommunication line
Download datasheet
Measurement principle
 First you have to know the propagation velocity of the current in the cable.
A measuring pulse is transmitted down a cable.
The signal travels down the cable and when a fault is reached the pulse energy is reflected back to the instrument.
On the reflectometer display, oscillocope type with on the abscissa the time and on Y-axis the voltage, we can see two abrupt tension changes : the first one corresponding with the initial pulse, the second appears when the reflection is back.
In this way the TDR10 measures the time it takes for the signal to travel down the cable between the measurement point and the fault. This time multiplied by the propagation velocity, divided by 2, gives the cable length between the measurement point and the fault.
WAVETEL solution
The TDR10 equipment has been conceived in order to locate accurately and instantaneously the faults on telecommunication lines and their qualification.
The various measurement modes provide an accurate location of discontinuities and faults such as : continuity break (open-circuit), wet section, short circuit etc... and that in up to 20 km long cable !
TDR (reflectometry) :
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