--- MPC 20 & 50 TESTER - M-981136 (vers. BD) --- Page
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6.8.- REPEATING TESTS
Ensure that the measuring electrode is actually testing the voltage drop in
the ground that is being tested which is a consequence of the current injected
by the MPC itself. Placing the measuring electrode in the right position is vital. It
is important that it is far from the area under the influence of both the
measuring electrode and the auxiliary electrode to obtain maximum accuracy.
It is advised that the measuring rod is moved +10% and then -10% from its
starting position along the axis formed by the earthing and the auxiliary
electrode separated by a distance L (if its position L=20 metres, it is to be
moved 2 metres from its original position). Make a note of the resistance value
for each position of the rod. If the values are the same or vary slightly the
measurement is correct. On the other hand if it is within the area influenced by
the two power slopes. The distance between the ground to be measured and
the auxiliary ground has to be increased.
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