Advantages/Disadvantages Of Wenner And Schlumberger - AEMC 6470 User Manual

4.7.1 Advantages and Disadvantages of Wenner and Schlumberger
Schlumberger
Advantage
Need to move the two
potential electrodes ES
(Xv) and S (Y) only for
most readings. This can
significantly decrease the
time required to acquire
a sounding
Because the potential
electrodes remain in
fixed locations, the ef-
fects of the near surface
lateral variations in
resistivity are reduced.
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Disadvantage
Because the potential
electrode spacing is
small compared to
the current electrode
soakings, higher meter
sensitivity is required.
In general, interpretations
based on DC soundings
will be limited to simple,
horizontal; layered
structures
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Wenner
Advantage
Potential electrode
spacing increases as
current electrode spacing
increases. Less sensitive
meters may be used.
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Ground Resistance Tester Model 6470
Disadvantage
All four electrodes, the
two current E (x) and H
(z) and the two potential
ES (Xv) and S (Y) must be
moved equally to acquire
each reading.
Because all electrodes
are moved for each
reading, this method can
be more susceptible to
near-surface, lateral, and
variations in resistiv-
ity. These near surface
lateral variations could
potentially be misinter-
preted in terms of depth
variations in resistivity.
In general, interpretations
based on DC soundings
will be limited to simple,
horizontal; layered
structure.
Source: DC Resistivity - T. Boyd
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