GRT350
‐
en
‐
GB_v1.3
12/16
6
Earth
Resistance
measurement
Note:
The
measured
results
may
be
influenced
by
inductive
or
capacitive
coupling
if
the
test
leads
are
twisted
or
adjacent
to
each
other.
When
connecting
the
Probes,
keep
the
leads
separated.
Setup
Insert
the
Potential
electrodes
(P)
and
the
Current
electrodes
(C)
as
deep
as
possible
into
the
soil.
The
distance
between
electrodes
must
be
5
to
10m
(16
to
32’).
Four
‐
terminal
earth
resistance
measurements
1
2
MAX.
AC 300V
H
S
E
ES
P
2
C
2
C
1
P
1
3
(1)
Earth
electrode
(rod)
under
test
(2)
Potential
spike
(3)
Current
spike
Three
‐
terminal
earth
resistance
measurements
1
2
MAX.
AC 300V
H
S
E
ES
P
2
C
2
C
1
P
1
3
(1)
Earth
electrode
(rod)
under
test
(2)
Potential
spike
(3)
Current
spike
Two
‐
terminal
earth
resistance
measurements
1
2
MAX.
AC 300V
P
2
C
2
C
1
P
1
H
S
E
ES
(1)
Earth
electrode
(rod)
under
test
(2)
Potential
spike
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