VR2250
Page 52 of 131
6.5.2. Measurement procedure and results of "
ρ
" mode
1. Select
ρ
measurement mode by means of the
F1
key.
2. Select the distance
d
between the earth rods by means the
F3
and
F4
keys.
3. Connect the 4 Red, Green, Yellow and Blue connectors of the single cables in the
corresponding input terminals of the instrument
B1
,
B2
,
B3
,
B4
.
B2
B3
B4
B1
I1
d
d
d
d
Instrument connection for Earth resistivity measurement
4. Press the
START
key. The instrument starts the test.
At the end of the test
the instrument emits a
double sound signal
indicating that the
test is correctly
terminated
and
displays the values
alongside.
EARTH
05.06.01
Earth Resistivity value
expressed in
Ω
m.
1.77
Ω
m
Vd= 1V
Test:04
ρ
AVG=0.74
Ω
ρ
DIST= 2m
Voltage value of electrical
noise
Number of test
Average Value of Earth
Resistivity calculated over the
Number of tests displayed.
FUNC CLR
↑
↓
"
ρ
" Working mode
5. The instrument will show automatically the average value of the Earth Resistivity
calculate over the tests performed. Press
F2
to RESET this value and the number of
Test.
This result can be stored pressing the
SAVE
key
twice
(according to paragraph 9.1).
START
STOP
Black
Yellow
Green
Red