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Ground Resistance Tester Steps & Setup

2024-10-06

Steps for Measuring Grounding Resistance with a Tester:

Probe Placement: Insert two grounding probes into the ground at 20m and 40m from the grounding point, with an insertion depth of 400mm. This follows the grounding resistance testing setup based on practical equivalence principles.

Instrument Setup and Wiring:

Position the grounding resistance tester horizontally near the grounding point.
Three-Terminal Measurement: Connect the shortest dedicated wire between the grounding point and the tester’s “E1” terminal.
Four-Terminal Measurement: Connect the shortest dedicated wire between the grounding point and the tester’s "C2" terminal (common side).
Connect the longest dedicated wire to the 40m current probe and the “C1” terminal on the tester.
Connect the 20m voltage probe to the tester’s “P1” terminal using the remaining dedicated wire.
Zero Calibration: Adjust the galvanometer pointer to the center line by using the “zeroing” adjustment knob if needed.

Setting the Scale: Set the “ratio scale” (or coarse adjustment knob) to the highest multiplier. Slowly turn the generator handle to move the pointer, then use the “measuring dial” (fine adjustment knob) to align the galvanometer pointer with the center line.

Fine Tuning: When the pointer is close to center, turn the handle at a speed of at least 120 rpm and adjust the measuring dial until the pointer aligns with the center line.

Adjusting Ratio Scale: If the measurement dial reading is too small (less than 1), reduce the ratio scale multiplier to get a more accurate reading on the center line.

Calculating Results: The grounding resistance value (R) is obtained by multiplying the reading on the “measuring dial” by the selected “ratio scale” setting.

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