48
On completion of the third measurement : the following quantities can be displayed using
the
DISPLAY
SMOOTH
DISPLAY
DISPLAY
SMOOTH
key , and saved using the
MEM
MR
MEM
MEM
MR
key.
Before storage of 3rd measurement
After storage of 3rd measurement
R
1-2
U
OUT
, F
measurement
,
I
H-E
R
∆
0 (if cord compensation used)
U
H-E
"NOISE"
(1)
and f
U
H-E
(2)
and f
R
C
, C
1
,C
2
R
A
, R
B
U
OUT
, F
measurement
U
H-E
"NOISE"
(1)
and f
U
H-E
(2)
and f
(1)
Accessible only if spurious voltages are present which have affected the accuracy of the
measurement (“NOISE” symbol on steady).
(2)
possible voltage present (post-measurement) across terminals.
You can read the results of the three measurements and the calculation using the MR function (
MEM
MR
MEM
MEM
MR
key). To select index 1 (1
st
3P measurement), 2 (2
nd
3P measurement), 3 (3
rd
2P measurement) or 4
(calculation of coupling coefficients), use the
and
keys.
These values can only be read after you have stopped the measurement using the STOP button.
4.4.4
CHARACTERISTICS :
See above §4.3.4
4.5 GROUND RESISTIVITY MEASUREMENT (
ρρρρ
position)
The ground resistivity is calculated using the resistance measurement R
S-ES
and distances between
the measurement rods.
Two calculation methods are possible : Wenner method or Schlumberger method.
To plot the resistivity profile as a function of the depth of the earth, the Schlumberger method is easier
to implement as only 2 rods need to be moved: the 2 outer rods.
With the Wenner method, the 4 rods need to be moved.
IMPORTANT NOTE :
- Fast measurement : pressed briefly, the START pushbutton triggers the resistance measurement R
S-ES
only.
- Expert measurement : pressed and held (2 seconds), the START pushbutton triggers the resistance
measurement R
S-ES
and the resistance measurements on the auxiliary rods R
PH,
R
PS,
R
PE
and
R
PES
.
4.5.1
METHODS AND CONNECTIONS
Wenner method
Connection :