3-Pin Method
The three-pin method can be used to measure the resistance to earth of a ground rod,
ground bed, anode, etc. For this method, connect the “C1” and “P1” binding posts
to the object being measured using separate leads, (See fig. 3), Connect “C2” to a pin
driven into the soil far enough away from the object under test so as not to influence the
reading. 100 feet would be typical for a ground rod 15 to 20 feet deep. Connect “P2” to
a pin 62% of the distance from the object being tested to the “C2” pin. Balance and read
in the usual way.
fig. 3 — A Typical Example
Single Probe Method
To use a single probe, connect “C1” to “P1” and “C2” to “P2” Make the probe
connections to “P1” and “P2”. (see fig. 4)
Drive the probe into the soil to the desired depth. Balance and read in the usual way.
Multiply the reading in ohms by the correct factor for the probe being used to obtain
resistivity in ohms/cm.
fig. 4
Summary of Contents for Soil Box
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