TDR

A TDR (Time Domain Reflectometer) is an instrument that uses the radar principle to identify, characterise and locate faults on cables with more than one conductor. It operates by sending a pulse down the cable, any changes in the impedance of the cable will result in reflections being sent back down the cable. These reflections are measured and displayed so that a 'map' of the cable is shown. Many faults are found at terminators or cable joints or other locations where there has been disruption to the route of the cable.

Any connection, change of cable type, break in the cable or fault will cause a change in impedance. Each type of change has a different effect on the display of the TDR; a positive reflection shows a higher impedance, a lower reflection shows a lower impedance.

In using a TDR you are not only capable of identifying faults on the cable but also find the distance to the fault. By simply entering the cable's length or velocity factor you can find and locate cable faults up to 20km on compatible instruments.

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