Ground Resistance Tester Usage Tips

2024-10-05

Key Considerations for Using a Grounding Resistance Tester:

Disconnection Requirement: Disconnect the grounding line from the protected device to ensure measurement accuracy.
Avoidance of Interference: Ensure no stray currents or loose soil near measurement points to prevent inaccuracies.
Environmental Conditions: Avoid measurements after rainfall or during rapid changes in climate, temperature, or pressure, as these conditions can affect readings.
Probe Placement: Keep the probe away from water pipes, cables, railways, and large metal objects. The current electrode should be at least 10m away, and the voltage electrode 50m away. Distances may be shortened if metal bodies aren’t connected to the grounding grid.
Insulated Wires: Use well-insulated wires for connections to prevent leakage.
Grounding Rod Position: Insert grounding rods in soil at zero potential.
Optimal Testing Season: For soil resistivity measurements, conduct tests in winter or in dry summer conditions for accurate results.
Avoid Contaminants: Ensure the testing area is free of electrolytic substances and organic matter to avoid measurement errors.
Galvanometer Sensitivity: If the galvanometer is too sensitive, adjust by moistening the soil or using a lighter voltage probe.
Instrument Calibration: Regularly verify the accuracy of the instrument.
Storage Conditions: Keep the tester in a stable indoor environment with temperatures between 0°C and 40°C, relative humidity below 80%, and away from corrosive substances.
Handling Precautions: Avoid strong impacts during use, transport, and storage to maintain instrument integrity.

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