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Suggested Procedure for using Soil Box Purpose: Measurement of electrical resistivity (in ohm-centimeters) of liquid or earth, sand or other particulate material which can be tamped into the soil box. Equipment Required: 1.) 2.) 3.) 4.) Battery or DC power supply capable of putting out at least 20V DC at about 100ma Soil Box DC milliammeter with ranges of about 1ma to 100ma. DC Electronic Voltmeter with input resistance of at least 10 Megohms and ranges of up to 20V . 5.) Four insulated test leads.
Soil Box Attach the "c" binding posts to the end term inals of the box and the “P” binding posts to the adjacent center terminals. (see fig. 1) fig. 1 Balance and read in the usual way. Apply the correct multiplying factor, if any, for the box you are using. To obtain the resistivity of a sample of soil or water, the box should be filled even with the top, with no voids.
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.
NOTE: 1 When using multi-meters be sure readings on both meters are obtained simultaneously. 2. Potential must be in volts, current must be in amperes to obtain result in ohm-cm. 3. Multiplication factor for the H-4386 soil box is 1. 4. When used with the H-4385A Soil Resistance Meter, 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.
Warranty Humboldt Mfg. Co. warrants its products to be free from defects in material or workmanship. The exclusive remedy for this warranty is Humboldt Mfg. Co., factory replacement of any part or parts of such product, for the warranty of this product please refer to Humboldt Mfg. Co. catalog on Terms and Conditions of Sale. The purchaser is responsible for the transportation charges. Humboldt Mfg. Co.
