Chauvin Arnoux C.A 6470, User Manual, Page: 56 / 140

54
7 TERMS AND ABREVIATIONS
m
Ω Ω Ω Ω
: Low resistance / continuity measurement
3 poles : Earth measurement with 2 auxiliary rods
ρρρρ
s
: Ground resistivity per Schlumberger method – expressed in
Ω
.m
ρρρρ
W
: Ground resistivity per Wenner method – expressed in
Ω
.m
d, A : Distances to be programmed to calculate resistivity and according to
method
H : H terminal
S : S terminal
ES : ES terminal
E : H terminal
EARTH : Earth measurement
EARTH COUPLING : Earth coupling measurement
Usr : Frequency selected by user
U
OUT
Voltage generated by device across terminals H and E (16V or 32V)
U
H-E
: Voltage measured or generated across H and E terminals
U
S-E
: Voltage measured across S and E terminals
U
S-ES
: Voltage measured across S and ES terminals
U
H-E
« NOISE » and
f
: Spurious voltage measured across H and E terminals and its frequency
U
S-E
« NOISE » and
f
: Spurious voltage measured across S and E terminals and its frequency
R+ : Resistance measured with positive polarity current
R- : Resistance measured with negative polarity current
R : Mean resistance of R+ and R-
f
mesure
: Measurement frequency
R
∆∆∆∆
0
: Cord compensation resistance
I
H-E
: Measurement current across H and E terminals
R
E
: Resistance of rod E
R
H
: Resistance of rod H
R
S
: Resistance of rod S
R
SES
Resistance of rod ES
R
S-ES
: Resistance across rods S and ES (used for resistivity calculation)