Megger TDR1000/3P time domain reflectometer

Megger’s handheld TDR1000/3P time domain reflectometer (TDR) locates faults on low-voltage power cables of all types, including modern concentric types. The TDR1000/3P incorporates an auto set-up feature for inexperienced users.

Auto set-up automatically determines the impedance of the cable under test and sets the instrument accordingly. It automatically selects the optimum gain and pulse width according to the range chosen by the operator. The need for manual setting is therefore eliminated, although a manual set-up option is also provided for those who prefer to have full control of testing parameters.

In addition, technology used in the TDR1000/3P means that locating cable faults near to the instrument - something that was difficult or impossible with older instruments - is no longer a problem. By using launch pulses with durations as short as 2 ns, the TDR1000/3P claims to accurately determine the location of faults that are less than a metre from the point of connection.

It is rated at CAT IV and the TDR1000/3P incorporates a large high-resolution backlit display. This makes it easy to analyse the traces and to accurately position the cursors, two of which are provided to give users full control and to provide instant indication of the distance between two points.

The trace hold function allows comparisons to be made between cables: the trace for the first cable is held on the display and is then overlaid by the trace for next cable tested. This comparison function is normally only available on much larger and much more costly dual-channel TDRs.

Megger’s TDR1000/3P time domain reflectometer is designed for use on all cables with impedances of 25, 50, 75 or 100 Ω and velocity factors from 0.2 to 0.99. It has user-selectable ranges from 10 to 5000 m and, in manual operating mode, the gain for each range can be set in four user-selectable steps. Supplied with fused test leads, the instrument features rugged yet lightweight construction and an IP54 ingress protection rating. It is powered from AA batteries.