Megger MFT-X1 - Hot Key 3 - no RCD, RCD or EV RDC Options; Hot Key 4 - 2 Wire, 2 Wire HR and 3 Wire Methods; Hot Key 5 - Test-Lead Connections

14.2.3 Hot key 3 – No RCD, RCD or EV RDC options
Connection help screens
14.2.4 Hot key 4 – 2 wire, 2 wire HR and 3 wire methods
 2 wire
This method only uses two connections to make the measurement. It will work on No RCD, RCD or EV RDC modes.
 2 wire HR (high resolution)
This method uses the No RCD mode (high current) and gives result to 0.001 Ω resolution.
 3 wire
This method is designed for RCD protected circuits and requires all three test-leads to be connected to the circuit.
It can ONLY be used on RCD or EV RDC modes, as No RCD mode will trip the RCD.
It will provide all three circuit results (L-PE, L-N and N-PE).
14.2.5 Hot key 5 – test-lead connections
The loop Impedance function allows all three leads to be connected to the circuit under test, either
L – Live (phase) + N (neutral) + PE (earth)
Or
L1 (phase 1) + L2 (phase 2) = L3 (phase 3)
Hot key 5 allows the operator to switch the tests modes between different terminals without having to redue the
need for connecting to live circuits.
 L-PE
Testing the L-PE Loop Impedance
For 3 wire testing the instrument report all three Loop Impedances L-PE, L-N and N-PE
For 2 wire testing the instrument reports just the L-PE Loop Impedance
 L-N
Testing the L-N Loop Impedance
For use with 2 wire methods only
 L1-L2
Testing the L1-L2 Loop Impedance
For use with 2 wire methods only
 L2-L3
Testing the L2-L3 Loop Impedance
For use with 2 wire methods only
 L3-L1
Testing the L3-L1 Loop Impedance
For use with 2 wire methods only
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MFT-X1
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Earth Loop Impedance testing – TrueLoop™