MI 2126 Earth 2/3 Using instrument
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3 Using instrument
3.1 Performing 3-wire measurement
The Earth 2/3 is able to carry out earth resistance measurement using three wire test
method.
The distance from the earthing electrode (black, E) to the current measurement probe
(blue, H) is at least 5 times the length of earthing electrode rod or the length of the band
electrode (see Figure 5).
If measuring the total earth resistance of a complex earthing system, the required
distance depends on the longest (diagonal) distance (d) between the individual earthing
electrodes (see Figure 6).
Step 1
• Connect test leads to the instrument and to the object under test according to the
figures below.
Figure 5. Connection of standard 20 m long test leads
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