Lippmann Geophysical Instruments (LGM)

- Model hp - 4 Point Light Earth Resistivity Meter

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The earth resistivity meter 4point light hp is a geoelectrical instrument to determine induced polarization (IP) with adequate power to drive Schlumberger soundings up to L/2 = 1000 m.

  • Fast mapping function for archeological measurements (like GeoScan RM4/RM15)
  • Memory for more than 16.000 measured values
  • Full remote control
  • Galvanically isolated interface
  • Induced polarization
  • Quick charge of internal batteries (3 h)
  • Various automatic functions for mapping and sounding
  • Determination of frequency dependence of resistivity
  • Spectral IP
  • Phase resolution up to 0.05 mRad
  • Automatic trigger for mapping
  • Complete calibration possible at an internal reference resistor
  • Interface for active electrodes
  • Determination of the statistical measurement errors
  • Direct calculation or rho-s for Wenner, Schlumberger, Schlumberger/2 Pole-Pole, Dipole-Dipole

  • Size : 25 x 12 x 5 cm
  • Weight : 750 g including batteries!!
  • (for comparison: Terrameter SAS-1000: 5 kg, AGI MiniSting: 6.6 kg)
  • Frequency : 1.08 - 10 Hz
  • Output current : 380 V p-p
  • Output voltage : 100 nA ... 50 mA
  • Resolution : 50 nV
  • Phase resolution up to 0.05 mRad
  • 24Bit AD-Converter
  • Accuracy : 0.2 %
  • Display : 4 x 20 digit LCD
  • In-Phase/Out-of-Phase-Display
  • Velocity : 1.5-2 sec/measured value

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