Time Domain Reflectometers

Time Domain Reflectometers

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

Here at the Network Store we are currently able to offer four different types of Time Domain Reflectometers and we can also supply Megger accessories.

Megger TDR500 - An entry level TDR for locating faults on metallic cable up to 3km

Megger TDR 900 - An advanced cable length meter for measuring cables up to 3km

MeggerTDR1000/2 - Identifies a variety of cable faults with a range of 10m to 3km

MeggerTDR2000/2 - Dual channel TDR capable of finding faults on cable up to 20km

If you are unsure about what sort of TDR (Time Domain Reflectometer) would best suit your needs or if you have any questions then please give our sales team a call on 0845 519 64 94 and they will be happy to discuss what solution best meets your requirements.