H-4385D
Resistivity Meter, Digital
Digital Resistivity Meter provides soil resistivity readings at the push of a button
H-4385
Resistivity Meter, Analog
The Resistivity Meter is used to measure resistivity of soil in-situ using 2, 3, or 4 electrodes
H-4388
Resistivity Test Reel with Soil Pins
Four pin, test reel set for attaining 1-20 ft. depth measurements
H-4385.1
Resistivity Meter Test Kit
The Soil resistivity test kit is designed to conveniently store and carry all that is necessary to perform at test
H-4386SM
Soil Box, Small, 80ml capacity
Quick and accurate measurement of resistivity of a soil or water sample, field or laboratory
H-4386.XX
Soil Box
For use with Resistivity Meters
H-4388.1
Soil Pins (Electrodes)
Set of four Soil Pins for use with Resistivity Meters
H-4385.5
Soil Cylinder
The Soil Cylinder can be used for either of the 2-electrode methods— ASTM G187 or AASHTO T-288
H-4387
Soil Box Leads, set of 4
Set of four Lead wires for use with Resistivity Meters
H-4385.SRM
Soil Resistivity Meter Test Box
Resistivity
When combined with the appropriate electrodes (pins) and test leads, these resistivity meters can be used to measure earth resistance or the resistance-to earth of a buried electrode, such as a ground rod or an anode, for example. Depending on the application, 4-Electrode, 3-Electrode or 2-Electrode, these resistivity meters can be used to determine the following:
- The average earth resistivity to a specific depth (with the application of an appropriate multiplier to convert resistance to resistivity, based on the electrode separation distance) – 4-Electrode Application
- The resistivity of a soil sample, or of a liquid, via an electrolyte (soil/liquid) box (with the application of an appropriate multiplier to convert resistance to resistivity, depending on the box geometry)
4-Electrode Application
• The resistance-to-earth of a buried electrode, such as a ground rod, or an anode, for example
3-Electrode Application
• The resistance between two buried electrodes, such as two ground rods, or two anodes
2-Electrode Application
The current source in these meters, which supplies current between the C1 and C2 terminals (with a load applied), is a 12V(rms) crystal-controlled 97Hz square wave oscillator and the voltmeter inside the unit, which senses the potential difference (voltage drop) appearing across the P1 and P2 terminals, employs a very narrow band-pass filter centered at 97Hz.
What this means is that resistance measurements taken by the meters are unaffected by any stray interference signals (having frequencies other than 97Hz) that may be present in the earth during a measurement. These resistivity meters have a resistance measurement range from 0.01Ohm (0.01Ω) to 1.1 MOhm (1.1MΩ) that is achieved by means of a set of 8 range settings and a system of internal “standard” resistors. External resistances (resistance values under test) are compared against the internal “standards, via a null balancing system, resulting in a determination of the external resistance values.