When measuring the grounding resistance, there are some objective factors that make the grounding resistance measurement inaccurate. The following are some common objective factors and their solutions:

1. Inconsistent composition, geology, tightness and water content of the soil around the grounding system will affect the test. The stray current on the ground surface (especially the overhead ground wire, underground water pipe, cable sheath, etc.) will also have a certain impact on the measurement results.

The solution is to choose different positions for measurement and take the average of the measurement results.

2, the auxiliary grounding pole resistance is too large to affect the measurement results.

The solution is to pour water on the ground pile, or use a negative agent to reduce the grounding resistance of the current pole.

3. The contact resistance between the test clip and the grounding measurement point is too large to affect the measurement result.

The solution is to polish the contact points with a file or sandpaper and clamp the polished contacts with a test line clip.

4. Interference affects measurement results.

The solution is to adjust the direction of pay-off to the direction of less interference, so as to reduce the meter count beat.

5. Inaccurate measurement results caused by the use of the instrument, such as insufficient battery power, instrument accuracy decline, etc.

The solution: replace the battery; Recalibrate the instrument.