Miller 400D
Digital Resistance Meter
Resistance data recorded using various resistance meters, including the Miller 400D Resistance Meter
A comparison study
A. The 4-Pin (Wenner) Method
| PIN SPACING |
NILSSON 400 ANALOG METER READING |
MILLER 400D DIGITAL METER READING |
BIDDLE DET2/2 DIGITAL METER READING |
| 20 feet |
R = 1.65 Ω
(ρ = 6,319.5 Ω.cm) |
R = 1.66 Ω
(ρ = 6,357.8 Ω.cm) |
R = 1.68 Ω
(ρ = 6,434.4 Ω.cm) |
| 10 feet |
R = 4.50 Ω
(ρ = 8,617.5 Ω.cm) |
R = 4.47 Ω
(ρ = 8,560 Ω.cm) |
R = 4.51 Ω
(ρ = 8,636.6 Ω.cm) |
| 5 feet |
R = 8.60 Ω
(ρ = 8,234.5 Ω.cm) |
R = 8.54 Ω
(ρ = 8,177 Ω.cm) |
R = 8.58 Ω
(ρ = 8,215.3 Ω.cm) |
Table 1: Soil resistance data (plus calculated resistivity values) for a number of pin spacing distances. The data were recorded using the 4-pin method in the area of the MCM training pipeline right-of-way (June 25, 2009 in Sebastian, Florida). The soil resistance readings were taken using the various resistance meters within seconds of each other.
B. The Soil Box Method
| NILSSON 400 ANALOG METER READING |
MILLER 400D DIGITAL METER READING |
BIDDLE DET2/2 DIGITAL METER READING |
R = 5.10 kΩ
(ρ = 5,100 Ω.cm) |
R = 5.06 kΩ
(ρ = 5,060 Ω.cm) |
R = 5.04 kΩ
(ρ = 5,040 Ω.cm) |
Table 2: Resistance data measured using a soil box. A “Standard” liquid electrolyte having a quoted conductivity value of 200 μS/cm
(5,000 Ω.cm) at 25°C was used in an M. C. Miller “soil” box having an A/L multiplier value of 1cm. The electrolyte resistance readings
were taken using the various resistance meters within seconds of each other.
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