Four-terminal resistivity measurement (DET4TD, DET4TR2, DET4TC2 and
DET4TCR2)
The DET4TD2, DET4TR2, DET4TC2 and DET4TCR2 can be used to make soil resistivity measurements.
The resistivity value can be derived from the four-terminal resistance reading made by the instrument and
the particular separation and depth of the stakes.
1. Ensure the rotary selector switch is in the OFF position.
2. Connect the instrument as shown in Figure 27.
Figure 27: instrument connection for measuring four-terminal resistance
3. Set the rotary selector switch to the 4P position.
4. Select the desired test voltage using the 25 V/50 V button.
5. DET4TC2 and DET4TCR2 only: Select the desired test frequency using the Hz button.
6. Press and release the TEST button [by holding the TEST button, the resistance measurement will
be continually updated].
7. The instrument will perform pre-measurement check, the status of which will be indicated on the
display.
8. The four-terminal resistance reading will be displayed as shown in Figure 28.
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