AEMC 6470-b User Manual page 72

E
EARTH
EARTH COUPLING : coupling measurement between two earth sockets
ES
H
I-Act
(1)
I
H-E
NOISE
R
R+
R-
R-Act
(1)
R
1
R
2
R
1-2
R
A
R
b
R
C
R
E
R
H
R
PASS
R
S
R
(2)
S-ES
70
uality Products Online at:
: terminal E (X) - earth socket; current measurement return
terminal
: earth measurement (3 or 4 poles)
: ES (Xv) terminal (measurement potential socket for
calculating earth resistance)
: H (Z) terminal (measurement current injection terminal)
: external current circulating at present between the instrument
terminals
: measurement current circulating between the H and E
terminals
: indicates the presence of external interference causing
misrepresentation of the earth or resistivity measurement
: average resistance calculated from R+ and R-
: resistance measured with a positive current circulation from
terminal H to E
: resistance measured with a negative current circulation from
terminal H to E
: resistance currently calculated from values U-Act and I-Act
: first value measured to calculate the coupling between 2 earth
sockets (R = R
1 A
: second value measured to calculate the coupling between 2
earth sockets (R
2
: third value measured to calculate the coupling between 2
earth sockets (R
1-2
: first earth value calculated (R
: second earth value calculated (R
: coupling resistance between earths R
– R ) / 2)
1-2
: earth resistance connected to terminal E
: resistance of the stake connected to terminal H
: value of the R-Act resistance (PASS for "passive"
measurement with interference current circulating in the
installation)
: resistance of the stake connected to terminal S
: resistance between stakes S and ES (used for resistivity
measurement)
GlobalTestSupply
www.
+ R )
C
= R + R )
b C
= R + R )
A b
= R - R
A 1
= R
b
Ground Resistance Tester Model 6470-B
)
C
- R )
1 C
and R (R = (R
A b c 1
.com
sales@GlobalTestSupp
+ R
2