Shanghai Duan introduced the measurement procedure of earth resistance soil resistivity tester

1) Insert two grounded probes in the grounding direction of the grounding body and insert them into the ground 20m to 40m away from the grounding body. The insertion depth is 400mm, as shown in the figure below.
2) Place the grounding resistance soil resistivity tester near the grounding body and perform wiring. The wiring method is as follows:
1 Connect the grounding body to the terminal "E1" (three-terminal meter) or to the short-circuited common terminal (four-terminal meter) with the shortest dedicated wire.
2 Use the longest dedicated wire to connect the measuring probe (current probe) with a distance of 40 m from the grounding body to the connection terminal “C1” of the measuring instrument.
3 Connect the measuring probe (potential probe) located at a distance of 20 m from the grounding body to the terminal “P1” of the measuring instrument with a dedicated wire of the remaining length.
3) After placing the meter horizontally, check whether the pointer of the galvanometer points to the center line, otherwise adjust the “Zero Adjuster” so that the pointer of the meter points to the center line.
4) Set the "multiplication scale" (or coarse adjustment knob) to the maximum multiple and slowly turn the generator handle (the pointer starts to shift) while rotating the "measuring dial" (or fine tuning) Knob) Point the galvanometer hand to the center line.
5) When the pointer of the galvanometer is close to balance (the pointer is close to the center line), rotate the handle faster to make the rotation speed reach 120r/min or more, and adjust the “measuring dial” to make the pointer point to the center line.
6) If the reading of the “measuring dial” is too small (less than 1), it is difficult to read accurately, indicating that the magnification scale is too large. At this time, you should set the “scale” to a smaller multiple and re-adjust the “measuring dial” so that the pointer points to the center line and read out the exact reading.
7) Calculate the measurement result, ie R = "Magnification Scale" reading × "Measurement Dial" reading.

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