10
GLOSSAry
This glossary lists the terms and abbreviations used on the device and its digital display unit.
3 poles
:
earth resistance measurement with 2 auxiliary electrodes (3P).
4 poles
:
4-wire measurement of low earth resistance using 2 auxiliary electrodes (4P).
C
1
:
coupling coefficient of earth R
A
with earth R
b
(C
1
= R
C
/R
1
).
C
2
:
coupling coefficient of earth R
b
with earth R
A
(C
2
= R
C
/R
2
).
d, A:
distances to be programmed for the resistivity calculation depending on the
measurement method used.
m
Ω
:
low resistance/continuity measurement.
E
:
terminal E (earth electrode, measurement current return terminal)
EArtH
:
earth measurement (3-pole or 4-pole).
EArtH COuPLING:
measurement of coupling between 2 earth electrodes.
ES
:
terminal ES (acquisition of reference potential for the 4P earth resistance
calculation).
H
:
terminal H (measurement current injection terminal).
I
H-E
:
measurement current flowing between terminals H and E.
NOISE
:
indicates that a spurious external voltage is present and interfering with the earth
or resistivity measurement.
r
:
mean resistance calculated from R+ and R-.
r+
:
resistance measured with a positive current flowing from terminal H to terminal E.
r-
:
resistance measured with a negative current flowing from terminal H to terminal E.
r
1
:
first value measured to calculate the coupling between 2 earth electrodes
(R
1
= R
A
+ R
C
).
r
2
:
second value measured to calculate the coupling between 2 earth electrodes
(R
2
= R
b
+ R
C
).
r
1-2
:
third value measured to calculate the coupling between 2 earth electrodes
(R
1-2
= R
A
+ R
b
).
r
A
:
first earth value calculated (R
A
= R
1
- R
C
).
r
b
:
second earth value calculated (R
b
= R
1
- R
C
).
r
C
:
coupling resistance between earths R
A
and R
b
(R
C
= (R
1
+ R
2
- R
1-2
)/2).
r
E
:
resistance of the earth connected between terminal E and electrode S.
r
H
:
resistance of the electrode connected to terminal H.
r
S
:
resistance of the electrode connected to terminal S.
r
S-ES
(2)
:
resistance between electrodes S and ES (used for the resistivity measurement).
r
∆
0
:
measurement leads compensation resistance.
S
:
terminal S (acquisition of measurement potential for the earth resistance
calculation).
u-Act
(1)
:
present (Act) external voltage on the terminals of the device.
u
H-E
:
voltage measured between terminals H and E.
u
Out
:
voltage generated by the device between its terminals H and E (32V or 16V).
