Ground Resistance Tester Model 6471
63
The instrument should be strategically positioned so that the leads will not be too
short to perform all the measurements.
The Input Noise option allows the viewing of noise for Z or Y inputs.
Figure 8-9
8.4.5 4-Pole Soil Resistivity
When
4-Pole Test Resistivity
is selected from the tool bar, you can select:
• With or without Auxiliary Rod Resistance.
•
Test voltage 16 or 32V
AC.
• Auto frequency - selects the optimum frequency (from 41 to 128Hz), usually
128Hz, or select manually from the drop-down frequency list.
• Test Method - Wenner or Schlumberger.
• Distances - the distance “d” (for Wenner test method) or “d” and “a” (for Sch-
lumberger test method), between the test electrodes, needs to be entered
for resistivity calculation to read out directly in Rho.
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