HT instruments MACROTEST 5035 - Manual (Page 52)

MACROTEST 5035
EN - 51
4.6.3. Measurement procedure for " ρ" test mode
The earth resistivity is a very useful parameter, its value could help the designer to
correctly size the earth rods in an earth plant.
The measurement is taken according to what prescribed for CEI 64.8, IEC 781, VDE 0413,
EN61557-5
1. Select "
ρ" earth measurement mode by means of the F1 key.
2. Connect the Black, Red, Green and Blue cables to the corresponding input terminals of the
instrument
B1, B2, B3, B4 (see possible connections in the following picture).
3. Connect the cables to the auxiliary rods (see connections in the following picture).
B2 B3 B4 B1
a
a
a a
Earth resistivity measurement
4.
To select the distance
DIST between the rods. This parameter can take
the following values (expressed in meters):
1, 2, 3, 4, 5, 6, 7, 8, 9, 10.
At the end of the test the instrument
displays the values alongside.
-
ρ
5
m
SE LE
5.
Press U
L
▼ and S▲s keys to select the distance value.
6. Press
ESC key to leave this menu confirming the settings.
7. Press
the START/STOP key. The instrument starts the test.
START
STOP
Distance between the rods set value.
RCL
ESC
U
n
/I
∆n
DIST
S▲
U
L
▼