Hioki FT6031-50, Инструкция по эксплуатации, Страница: 53 / 98

47
Precise Measurement for Earth Resistance
(Precise Measurement Method, 3-pole Method)
• The auxiliary earthing electrodes’ earth resistance (R
S
, R
H
)
measured values are used to automatically check whether the
earthing electrode’s earth resistance (R
E
) can be measured. R
S
and R
H
do not provide the same level of resolution as the earthing
electrode’s earth resistance (R
E
).
For the resolution of earth resistance of auxiliary earthing
electrode, see “Specifications” (p. 67).
• 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 RH 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 )
HIOKI FT6031B961-00