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9. Earth resistance measurement (not MFT1815)
The Megger MFT family of test instruments offers a unique solution to the measurement of earth or ground electrode (rod) supporting 2
and 3 wire measurements:
The MFT1825 can use an optional current clamp (ICLAMP) to measure electrode (rod) resistance without disconnection, leaving the
installation earthing system intact (Attached Rod Technique, ART).
Additionally, the MFT1835 can drive an optional voltage-inducing clamp (VCLAMP) which, in conjunction with the ICLAMP, can be used
to make stake-less measurements of the earthing system.
For the principles of Earth resistance testing go to Appendix
9.1 Connection terminals
The terminal references used on the MFT are:
MFT1800
H
E
S
The terminal colours correspond to the Earth test lead set, not the standard test leads shipped with the MFT1800.
MFT1835 Connection panel
I
CAT IV
300V
12-15V
1.2A
H E S
V
9.2 Touch voltage limit
Adjust the touch voltage limit to 25 V or 50 V depending on location. Refer to section 10)
9.3 Making a measurement - Two terminal resistance measurement
.1 Connect the instrument as shown below.
I
CAT IV
300V
12-15V
1.2A
Electrode
under test
Potential
stake
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