Hioki FT6031 - Page 45

41
Precise Measurement for Earth Resistance
(Precise Measurement Method, Three-pole Method)
DISPLAY button allows to display the earth resistance and earth
potential of each earthing electrode.
Earth resistance of earthing electrode E
Earth resistance of auxiliary earthing electrode S
Earth resistance of auxiliary earthing electrode H
V
Earth potential
When the resistance (R
H
) of auxiliary earthing electrode exceeds
5 k
Ω
, the display range becomes the range of 200
Ω
without
displaying the digit of 0.01
Ω
even though the resistance of
earthing electrode is 20
Ω
or less. The following table shows
examples.
If the digit of 0.01
Ω
is required, pour some water over the
auxiliary earthing rod (H) to reduce the earth resistance to 5 k
Ω
or
less.
Resistance R
H
of
auxiliary earthing
electrode H
Example of indicated
value (1)
When 9.52
Ω
is
measured
Example of indicated
value (2)
When 13.48
Ω
is
measured
0 to 5 k
Ω
9.52
Ω
(Range: 20
Ω
) 13.48
Ω
(Range: 20
Ω
)
5 k
Ω
to 50 k
Ω
9.5
Ω
(Range: 200
Ω
) 13.5
Ω
(Range: 200
Ω
)