GRT350
‐
en
‐
GB_v1.3
12/16
7
Testing
1.
Connect
the
test
leads
for
2,
3
or
4
terminal
Earth
Resistance
testing.
P1
=
Green
lead,
C1
=
Black
lead,
P2
=
Yellow
lead,
C2
=
Red
lead
2.
Press
the
ON/OFF
button
and
wait
for
the
“Select
Function”
screen
to
appear.
8.
Press
the
"
►
"
button
to
select
"2P",
"3P"
or
"4P"
depending
on
the
test.
3.
Press
"TEST/STOP"
button
to
begin
the
test.
4.
The
meter
will
beep
while
the
test
is
in
progress
(for
approximately
10
seconds)
and
then
the
reading
will
appear
on
the
lower
line
of
the
display.
5.
Press
SAVE
to
save
the
results
in
Log
memory.
6.
Press
ESC
to
return
to
the
“Select
Function”
display.
Notes
for
"Rc"
&
"Rp"
LED
indications:
Rc:
No
test
current
output.
Check
the
connections
and
settings.
Rp:
If
Rp
is
on
and
the
display
indicates
“>
2
k
Ω
”,
the
earth
resistance
is
greater
than
2000
Ω
.
Earth
Resistivity
Testing
(
ρ
)
(Wenner
4
‐
point
method)
Insert
the
four
electrodes
at
equal
distances
(and
in
a
straight
line)
at
an
interval
of
1
to
30m
(3.3
to
32.3’)
apart.
The
depth
should
be
5%
(or
less)
the
distance
between
the
electrodes.
For
example:
if
the
distance
between
the
electrodes
is
5m
(16’),
the
electrodes
should
be
inserted
to
a
depth
of
25cm
(10”).
(500cm
x
5%
=
25cm)
NOTE:
The
length
can
be
set
between
1
and
50m
(3.3’
and
164’).
1.
Connect
the
test
leads
for
4
terminal
testing.
7.
Press
the
ON/OFF
button
and
wait
for
the
“Select
Function”
screen
to
appear.
2.
Press
the
"
►
"
button
and
select
"Resistivity".
3.
Press
"TEST/STOP"
button.
The
setting
length
will
display
on
the
screen.
4.
Press
the
"
►
"
or
"
◄
"
arrow
buttons
to
set
the
count
up
or
down.
5.
Press
"TEST/STOP"
button
to
begin
the
test.
6.
Press
SAVE
to
save
the
results
in
Log
memory.
7.
Press
ESC
to
return
to
the
“Select
Function”
display.
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.com
1.800.561.8187
