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Megger DET3TC
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46
Figure 28: example four-terminal resistance reading (DET4 display shown)
9. A soil resistivity value can be derived from the resistance reading and the stake geometry.
Note:
The instrument will display the warning triangle and an excessive noise voltage indicator if the ground
noise voltage is above 40 V pk-pk (14 Vrms).
The instrument will display the warning triangle and a voltage over-range condition if the ground
noise voltage is above 100 V – no resistance reading is possible under this condition.

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