When measuring the grounding resistance , what factors cause the grounding resistance to be inaccurate and how to avoid it?
A) The soil surrounding the grounding system (ground network) is inconsistent, with different geology, close and dry and wet degree, dispersive, ground surface stray current, especially overhead ground wire, underground water pipe, cable sheath, etc. The test has a particularly large impact. The solution is to take different points to take measurements and average them.
B) The test line is in the wrong direction and the distance is not long enough. The solution is to find the test direction and distance.
C) The auxiliary grounding electrode resistance is too large. The solution is to splash water at the ground stakes or use a resistance reducing agent to reduce the ground resistance of the current pole.
D) The contact resistance between the test clip and the ground measurement point is too large. The solution is to grind the contact point with a guillotine or sandpaper and fully clamp the polished contact with the test wire clip.
E) Interference effects. To solve the problem, adjust the direction of payoff and try to avoid the direction of large interference, so that the meter reading can be reduced.
F) Instrument usage issues. The battery is low. The solution is to replace the battery. The accuracy of the meter drops, and the solution is to recalibrate to zero.
A) The soil surrounding the grounding system (ground network) is inconsistent, with different geology, close and dry and wet degree, dispersive, ground surface stray current, especially overhead ground wire, underground water pipe, cable sheath, etc. The test has a particularly large impact. The solution is to take different points to take measurements and average them.
B) The test line is in the wrong direction and the distance is not long enough. The solution is to find the test direction and distance.
C) The auxiliary grounding electrode resistance is too large. The solution is to splash water at the ground stakes or use a resistance reducing agent to reduce the ground resistance of the current pole.
D) The contact resistance between the test clip and the ground measurement point is too large. The solution is to grind the contact point with a guillotine or sandpaper and fully clamp the polished contact with the test wire clip.
E) Interference effects. To solve the problem, adjust the direction of payoff and try to avoid the direction of large interference, so that the meter reading can be reduced.
F) Instrument usage issues. The battery is low. The solution is to replace the battery. The accuracy of the meter drops, and the solution is to recalibrate to zero.
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