- Instrumentation, Electrical Resistivity (Solid Earth Geophysics Encyclopedia)
- LandMapper ERM-02: handheld meter for near-surface electrical geophysical surveys
Table 1. Compare LandMapper ERM-01 and ERM-02
Submitted by landviser on Tue, 10/09/2012 - 19:02
Table 1. Compare LandMapper ERM-01 and ERM-02
|
Feature |
LandMapper ERM-01 |
LandMapper ERM-02 |
|
Electrical Resistivity, Ohm m |
YES |
YES |
|
Electrical Conductivity, Sm |
Post-process |
YES, direct readout |
|
Natural Electrical Potential |
NO |
YES |
|
Central-symmetric 4-electrode probes (Wenner, Schlumberger) |
YES |
YES |
|
Universal 4-electrode probes (dipole-dipole, square, etc.) |
NO |
YES |
|
Max depth (tested to, possibly more) |
100 m |
100 m |
|
Measurements in the lab |
YES |
YES |
|
Measurements in the soil pit |
YES |
YES |
|
Stores 1000 data points for download to PC |
YES |
YES |
|
Responds to commands from PC in interactive regime |
NO |
YES |
The accuracy of electrical resistivity measurements with LandMapper was tested by Landviser, LLC and by USGS and USDA labs alongside with Sting (AGI, Inc.) and AE-72 (analog Russian standard resistivity meter for deep geophysical sounding). Difference between equipment had not exceeded 2% in the wide range of resistivities. Being essentially direct current contact resistivity meter with high internal impedance, LandMapper can measure ER in a wide range from 0.1 to 106 Ohm m (Table 2) with automatic adjustment to the range of apparent resistivity in the studied media. LandMapper is being featured in 2nd edition of Solid Earth Encyclopedia as accurate and ultra-light field resistivity meter (Loke et al., 2011).