53
Cautions and Tips for Measurement
Ground Surface
Flat Section
Resistance
Area of E
Electrode
Resistance
Area of H(C)
Electrode
Measured Value
S(P)
The distance between E-H(C) of this device can be up to 50 m by using
the optional L9843-51 and L9843-52. In principle, it is possible to carry
out measurement even if the distance is more than 50 m. However, the
measurement result cannot be guaranteed.
Location to install auxiliary earthing rod
It is ideal to install the auxiliary earthing rod S(P) at the middle point
of the straight line between the earthing electrode E and auxiliary
earthing rod H(C).
However, if installation is not possible due to an obstacle etc.,
the measurement error can be reduced by installing the auxiliary
earthing rod (S(P)) within 29° from the straight line between the
earthing electrode E and auxiliary earthing rod H(C), wherein the
location should be outside the radius of 5 m from the earthing
element E and auxiliary earthing rod H(C) as shown in the gure.
5 m
5 m
29°
S(P) H(C)
E
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