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Soil Resistivity
Measurement
SOIL BOX by MC Miller Co.
For quick and accurate measurement
of resistivity of a sample
of soil, water or other electrolyte. For field or laboratory use.
Cat. # 37008 - Large
Cat. # 37006 - Small
For Use With
- Any model of MCM. multi-combination meter
- Nilsson Model 400 soil resistance meter
- Megger
- Ammeter and voltmeter or milliammeter and
Millivoltmeter with external battery
Construction
- Made of Plexiglas
- Rounded corners for easy
cleaning
- Current plates are made of
stainless steel
- Potential pins made of brass and
easily removed.
Dimensions, W x L x D
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Cat. # 37008 - Large
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Cat. # 37006 - Small
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1.50" x 8.75" x 1.25"
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1.16" x 4.39"
x .94"
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3.937 x 22.23 x 3.190 cm
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2.946 x 11.15 x 2.3876 cm
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The dimensions of the box have been chosen so that the
measured resistivity,- when the box is filled level, can be expressed in ohm-centimeter,
which is universally accepted terminology. When used with any MCM multi-combination meter
(or separate volt and ammeter) and an external battery, the resistivity of the sample can
be calculated as follows:
Resistivity = (change in potential between pins or delta V)
/ (change in current or delta I)
Typical Meter Connections
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Resistivity of soil or water by soil box method using the MCM B3D
digital multimeter. |
Resistivity of soil or water by soil box method using an earth
resistivity measuring set, such as Nilsson Model 400 Soil Resistance Meter. |
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Resistivity of soil or water by soil box method using the MCM B3A2
analog multimeter |
Resistivity of soil or water by soil box method using a
combination of meters and batteries |
Soil Box Test Leads
Cat. # 37009:
2 foot long, 2 black, 2 red, with banana plug and pointed plug ends.
Notes:
- When using multimeters, be sure readings on both meters are
obtained simultaneously.
- Potential must be in volts and current must be in amperes to
obtain result in ohm-cm.
- Multiplication factor for the MCM Soil Box is 1.
- When used with the Nilsson 400 Soil Resistance Meter or
Megger, no calculations are necessary because the multiplication factor is 1 ohm-cm.
Therefore, the resistivity value of the sample can be read directly off the meter dial.
Refer to the instruction sheet included with each meter for additional information.
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