![]() When the null detector is balanced, using the range switch and the dial, the resistance in ohms between PI and P2 is the dial reading multiplied by the range switch position. The detector senses the voltage drop between the P1 and P2 binding posts, compares it to internal standard resistors, and indicates a difference on the null detector. The detector, whose input is connected between the PI and P2 binding posts is only sensitive to 97 Hz, and so is not affected by stray A.C. The unit generates a low voltage 97 Hz square wave current between the Cl and C2 binding posts. The Model 400can be used as a 4, 3, or 2 pin device for soil resistance measurements, or can be used with a soil box or a single probe. The Nilsson Mode1400 Soil Resistance Meter is a 4 terminal, null balancing ohmmeter. NILSSON MODEL 400 4-PIN SOIL RESISTANCE METER CONTENTS PAGEĭESCRIPTION. ![]() A / L = 1 cmSoil Box Example: M.C.Miller Factory Tap Water Measured Resistance= 1.97 kΩResistivity Value= 1.97 kΩ x 1cm= 1,970 Ω.cmHence, MCM Water Conductivity = 507 µS/cm.SPECIALISTS IN ELECTRONIC AND ELECTRICAL MEASUREMENTSģ33 WEST SIDE AVENUE, JERSEY CITY, N.J. Cross-sectional area = 3 cm x 2.4 cm = 7.2 cm². The two interior pins are in use): The soil boxes are designed such that the cross-sectional area of the soil (or liquid) sample (A), with the box filled level, divided by the separation between the pins (L) is equal to 1 cm. ![]() Nilsson Model 400 Manual Nilsson 400 Soil Resistance Meter Stainless steel current distribution plates and removable brass pins (potential measurement pins)Critical Dimensions (for 4-electrode method, i.e. Plexiglas body with rounded corners for easy cleaning. Please see the following link for details. Our Small Soil Box, which has a 80 ml (80 cm³) volume is compatible with 4-Terminal Resistance Meters such as the, the and the Nilsson 400 Resistance Meters.Miller Soil Boxes can be used to satisfy either the 4-electrode method (ASTM G57 Standard) or the 2-electrode methods (ASTM G187 or AASHTO T-288 Standards).For the 2-electrode method, the two interior pins are removed which changes the multiplication factor from 1 cm (for the 4-electrode method) to either 0.67 cm for the small box or to 0.57 cm for the large box. ![]()
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