4. Repeatedly press Hot key 2 to select No RCD.
NOTE : If an RCD is present use the RCD option.
4.1. Alternatively, press Hot key 2 once and use the right-
hand rotary knob to select No RCD.
5. Repeatedly press Hot key 4 to select either 2 wire or 2 wire HR
testing. In this case 2 wire.
5.1. Alternatively, press Hot key 4 once and use the right-
hand rotary knob to select either
2 wire or 2 wire HR testing.
6. Repeatedly press Hot key 5 to select L-PE for R1+R2
measurement or L-N for Vdrop measurement.
6.1. Alternatively, press Hot key 5 once and use the right-
hand rotary knob to select L-PE.
7. Connect your test-leads to the L and PE conductors of the
supply at the point where it enters the building.
8. Press and release the test button.
If AUTO START is enabled in settings press the test button BEFORE
connecting the test-leads.
9. The Confidence Meter™ bar reduces towards the middle as
the circuit is analyzed.
10. When the test is complete, the display shows the external
reference impedance (Zref).
11. The instrument stores the value of Zref even if you turn the
instrument off.
12. To update Zref, repeat the measuring procedure.
www.megger.com
MFT-X1
72
Earth Loop Impedance testing – TrueLoop™
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