2. Connect test leads as below, with the Red test lead connected to the Red (L1) terminal on the MFT, the Green
test lead connected to the Green (L2) terminal and the Blue test lead to the Blue (L3) terminal.
RCD
g
L
N
E
MCB
L
N
E
MCB RCD
g
3. Ensure the display is in the “3Lo” mode. If not, press the function button to select “3Lo”.
4. Press ‘TEST’ to start the test sequence. This can be automated in Setup so the test starts when contacting the
circuit. See “11. Setup options” on page 53.
5. On completion of the test, the display will show the loop resistance on the large display segments, and the fault
current on the small display segments.
Using 2 wire measurement – 2Lo
1. Set the LEFT rotary range knob to the
L-PE
range.
2. Connect the test leads to the circuit as below, with the Red test lead connected to the Red (L1) terminal on the
MFT and the Green test lead to the Green (L2) terminal.
RCD
L
N
E
MCB
g
www.megger.com MFT1800 series
31
Loop impedance testing
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