Resistivity Meters

Devices

Earth resistivity meter 4point light 10W

Our high resolution earth resistivity meter 4point light 10W provides quantitative information about induced polarity (IP) of the soil. It measures the phase shift between the current injected into the ground and the voltage seen at the potential electrodes. It has adequate power to drive Schlumberger soundings up to L/2 = 1000 m.

Earth resistivity meter 4point light 10W

Key data
Size 25 x 12 x 5 cm
Weight750 g (including batteries)**
Frequency0.26 Hz ... 30 Hz
Output current1 μA ... 100 mA
Output voltage380 V p-p
Resolution receiver100 nV
Phase resolutionup to 0.05 mRad
AD-converter24 Bit
Display4 x 20 digit LCD
In-Phase/Out-of-Phase-Display
Accuracy0.2 %
Velocity1 sec / measured value
**Comparable competing products weigh between 4 and 7 kg!!

Features

  • Stacking of measurement values for improved signal-to-noise ratio
  • Determination of the statistical measurement errors
  • Direct calculation of rho-s for Wenner, Schlumberger, Schlumberger/2, Pole-Pole, Dipole-Dipole
  • Fast mapping function for archeological measurements (like GeoScan RM4/RM15)
  • Memory for more than 300.000 measured values
  • Full remote control
  • Galvanically isolated interface
  • Power supply by rechargeable standard NiMH batteries
  • Quick charge of internal batteries (3 h)
  • Various automatic functions for mapping and sounding
  • Automatic trigger for mapping
  • Determination of frequency dependence of resistivity
  • Spectral IP
  • Complete calibration possible at an internal reference resistor
  • Interface for active electrodes
  • Autonomous tomography mode
  • Measurements at regular intervals in monitoring mode
  • Connection for a mobile radio modem (GPRS)

Application

  • Groundwater prospecting
  • Mining
  • Environment
  • Induced polarization
  • Near surface geophysics
  • Lab measurements
  • Examination of building materials
  • Archeology

For further information please download our data sheet (pdf format)

Electrodes                                                up ↑

ActEle - Active Electrodes

For electrical resistivity tomography we offer a chain of active electrodes (ActEle). ActEle is developed especially for connection to the earth resistivity meter 4point light 10W. It is used for multielectrode measurements. By default the electrode chain consists of 20 electrodes at a distance of 5 metres. Other distances (0.2 - 10 m) are available on request. The chain is extendable up to 255 electrodes.

Multi-electrode System

Advantages

  • Low price – starting at 91 euros per electrode including cables and stainless steel electrodes.
  • Number of electrodes extendable up to 255 electrodes, according to demand.
  • Low power consumption, about 2 mW / electrode, active about 42 mW / electrode
  • Extremely high input impedance due to an integrated amplifier: 1GOhm@1Hz
  • Very low crosstalk between power and potential lines
  • Ideal for critical conditions with high contact resistance
  • Simple and cheap replacement of broken cables, even in the field
  • Fast: with ActEle and 4point light 10W a 600 reading 2D profile can be measured within 10 to 15 minutes (Compare this to the AGIUSA SWIFT / Sting System: it needs more than 2 hours for the same profile!!)

ActEle8/16/24 Switchboxes

ActEle8/16/24 switchboxes are switchboxes for multielectrodes with 8, 16 or 24 channels.

ActEle16

  • Compatible with the ActEle system. 8, 16 or 24 channels per box, size: 120 x 80 x 55 mm
  • For monitoring measurements

For information about the electrodes please also download our data sheet (pdf format)

Examples                                                 up ↑

Pictures of multielectrode measurements with ActEle

Active electrodes

Multielectrode measurement with 4point light 10W

Multielectrode measurement  in winter

Test measurement with active electrodes

Localisation of an burried steel water pipe

Test measurement with active electrodes

Bildunterschrift: Results for the localisation of a water pipe

No signature in the apparent resistivity signal, strong indication using IP.

Localisation of a quartz vein in granite

Test measurement with active electrodes

Bildunterschrift: Results for the localisation of a quarzt vein

Predecessors                                           up ↑

Earth resisitvity meter 4point light mC

Earth resisitvity meter 4-Punkt light mC

Key data
Size 25 x 12 x 5 cm
Weight750 g
Frequency4.16 / 5.00**Hz
Output current100 nA ... 10 mA
Resolution50 nV
Display4 x 20 digit LCD
Accuracy0.2 %
In-Phase/Out-of-Phase-Display
**in countries with 60 Hz line frequency

Comparative measurements 4point light mC / Syscal

Comparative measurement 4point light mC / Syscal R2

Bildunterschrift: Comparative measurement 4point light mC / Syscal R2

Although the power output of SYSCAL R2 far exceeds the power output of the 4point light mC, the results are almost identical. In order to ensure comparability the rho-s-axes of both mesurements were shifted with respect to each other. L/2 =325 m

Earth resistivity meter 4point light hp

Earth resistivity meter 4-Punkt light hp

Key data
Size25 x 12 x 5 cm
Weight750 g including batteries!!
(for comparison: Terrameter SAS-1000: 5 kg, AGI MiniSting: 6.6 kg)
Frequency1.08 - 10 Hz
Output current380 V p-p
Output voltage100 nA ... 50 mA
Resolution50 nV
Phase resolution up to 0.05 mRad
24Bit AD-Converter
Accuracy0.2 %
Display4 x 20 digit LCD
In-Phase/Out-of-Phase-Display
Velocity1.5-2 sec/measured value

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.

Features

  • 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

Earth resistivity meter 4point light

Earth resistivity meter 4-Punkt light

Earth resistivity meter 4point light
Key data
Size16 x 8 x 5 cm
Weight500 g
Frequency8.33 Hz
Output current100 nA ... 10 mA
Resolution100 nV
Accuracy0.2 %
Display4 1/2 Digit LCD
In-Phase/Out-of-Phase-Display for IP measurements

4point light was probably the smallest induced polarization earth resistivity meter on the market. It has adequate power to drive Schlumberger soundings up to L/2 = 200 m.

Application

  • Ground water imaging
  • Mining
  • Environment
  • Lab measurements
  • Induced polarization

Comparative measurements with GEOTRON G41

Comparative measurements of G41 and 4point light

Bildunterschrift: Comparative measurement of G41 and 4point light

Whereas GEOTRON G41 has a 200 times higher output power the miniature 4point light easily outperforms the G41. With spreads of more than 30 m the G41 results are erratical whereas the 4point light produces stable readings.

Cooperation partners

  • Geolog 2000 – Ingenieurbüro für System- und Messtechnik (more...)
  • GET – Geo Exploration Technologies GmbH / Advanced Geophysical Services (more...)
  • Geophysik – Dr. Rauen (more...)
  • KNGeoelektrik e.U. – Ingenieurbüro für Geologie (more...)
  • geoFact GmbH – Geophysikalische Dienstleistungen (more...)
  • Leipniz-Institut für Angewandte Geophysik (more...)
  • Arctic Geophysics Inc. – Geophysical Surveys, Prospecting, Consulting (more...)
  • Ground Water Imaging Pty Ltd (more...)

Publications

  • Vertical Soil Profiling Using a Galvanic Contact Resistivity Scanning Approach (Pan L et al., 2013) (mehr...)
  • High-mountainous permafrost under continental-climatic conditions: actual results of different mapping methods and an empirical-statistical modeling approach for the Northern Tien Shan (SE Kazakhstan) (Fischer T et al., 2013) (more...)
  • An automated electrical resistivity tomography system to monitor the freshwater/saltwater zone on a north sea island. (Grinat et al., 2010) (more...)
  • Geophysical Survey with 2D Resistivity – Pine Creek, British Columbia. (2010) (more...)