Using The Kit; Measuring A Cable Core Resistance From One End; Step 1, Attach The Bridging Lead Set; Step 2, Attach The Current And Potential (Four Wire) Lead Set - Megger DLRO10HD Guia Del Usuario

3. Using the Kit

3. 1 Measuring a cable core resistance from one end

A single cable core can be tested from one end using the following procedure:

3. 1. 1 Step 1, attach the bridging lead set

At the far end of the cable, select which core is to be measured. Select two other cores to use as P1
and C1 extension leads. Link together using the bridging leadset as shown above.

3. 1. 2 Step 2, attach the current and potential (four wire) lead set

Take the instrument to the working end of the long cable and connect to the two cores selected to be
the P1 and C1 connections. Connect the P2 and C2 test leads to the core to be measured as shown.
The measurement taken will be the resistance of only that individual core. The test leads can be then
repositioned to measure each core in turn.
Since this is a four wire measurement any additional resistance on the cores used to make P1 and C1
connections will not affect the accuracy of the measurement, provided they do not exceed the overall
C1 to C2 loop resistance limit of the DLRO instrument, which for the DLRO10HD and DLRO10HDX is
100 mΩ.
Length of cable is only limited by the C1 / C2 resistance outlined in above.
8 www.megger.com