GD-10 BasicGD-10 Resistivity and IP Imaging SystemGD-20 Resistivity and IP Imaging SystemWells and MarineBP Series Power
  • GD-20 system

    Distributed Centralized System 5/12 Channels

    Effective Field Survey

  • GD-20 system

    Distributed Centralized System 5/12 Channels

    Effective Field Survey

  • GD-20 system

    Distributed Centralized System 5/12 Channels

    Effective Field Survey

Product Introduction

  • GD-20 is a brand new multichannel geo-electrical system, designed with 5 or 12 channels and up to maximum 10 survey points can be measured concurrently for ERT survey, highly enhancing field survey efficiency. GD-20 can be used in SP, ERT and IP surveys. Comparing to single channel instruments, GD-20 boosts ERT survey efficiency up to 2-3 times in average and lowering working duration of field survey.

    GD-20 is portable and equipped with internal storage for data recording. Multichannel switch box. GD-20 is capable of performing VES, ERT and For VES, 12 depths can be measured concurrently. For ERT surveys, data acquisition can record up to 10 concurrent channels.  mode satisfies the need for arrays with infinite far electrodes of N terminal, with 10 individual acquisition channel for the best data collection efficiency.

    Main applications :

    -Energy resources exploration                                                         -Seawater intrusion detection

    -Metallic and nonmetallic mineral resources investigation        -Drilling / cross-hole detection

    -Groundwater resources exploration                                              -Geological mapping

    -Underground pollutant change detection                                     -Archeological research

    -Resistivity logging                                                                             -Real-time monitoring of landslides, tailings dams.

    -Interwell tomography                                                                      -Sediment detection of river, lake& reservoir

    -Urban engineering exploration                                                      -Surface or underwater surveys in the ocean

    -Cave exploration& pile foundation bedrock

    In ERT surveys, the major influencing factors to survey efficiency and operation cost are the switching device and multi-takeout cabling, overall size and weight of measurement system, layout efficiency, module reliability and the robustness to adapt to environment and clients’ demand. Geomative integrated the advantages of both conventional centralized cabling system and distributed cabling system, incorporating the low-cost and high reliability of the former with the high efficiency and infinitely extensible cable sections of the latter system. A distributed-centralized compacted cabling technique is hence developed, the Geomative. Each cable section has either 10 or 20 takeouts and is controlled through a centralized exchange control at the either end of the cabling heads, while the communication between the cabling heads and the measurement host adopted a distributed controlling approach. Both long cross-section ERT profiling survey and IP profiling can be performed by this system, in which the electrode placement is simple and robust, and the cabling system is highly reliable and low cost.

    GD-20 adopted modularized design and fully upgradable scheme, lowering the hardware maintenance and replacement cost. When clients intend to upgrade the purchased instrument, clients will only need to purchase corresponding license authorization and modules. Subsequent upgrades can be performed online through Geomative Studio directly and pre-purchased hardware resources are fully utilized. Furthermore, Geomative Studio software facilitates GD-20 geo-electrical measurement system to realize two major features:

    -      Engineering management mode enables client to manage complicated task particulars and measurement data from field surveys.

    -      Array configuration management function saves client the field operation time and enhance survey efficiency.

Product function

  • 1D VES for Resistivity or IP

    In 1D VES survey, transmission up to full power 7200W (1200V*6A) can be emitted to allow excited pulse signals to reach deeper strata. For small signals, up to 255 stacking amounts are allowed to enhance measurement accuracy. 1D survey layout can be placed and measured at 12 points concurrently, further reducing the amount of electrode scanning.

  • Supported 1D arrays (click for details) :

    Composite Profiling
    Dipole VES
    Customized arrays
  • 2D ERT or IP Profiling

    GD-20 ERT system is capable of conducting 2D cross-section profiling of ERT and IP in field. Through the array script management in Geomative Studio, clients can predefine survey parameters on PC prior to field surveys. Up to 3200W (800V*4A) transmission power can be deployed in field.

    All survey layout solutions:

    Conventional ERT (10 dual-takeouts)
    Conventional ERT (20 single-takeouts)
    Conventional IP (GD-20)
    Dual-takeout ERT survey (GD-20)
    Dual-takeout IP (GD-20)
  • Supported array configurations (click for details)

    Edge Gradient
    Double Side-3P
    Cross-Hole Dipole
    Bipole Up-Hole
    Customized arrays
  • Multi-instrument measurement: 2 array scripts can be measured concurrently for single channeled arrays, promising survey efficiency and the stability of measurement environment.

  • 3D ERT or IP Profiling

    Using GD-20 ERT measurement system, the sectional centralized cabling layout can be deployed robustly in a snakelike layout pattern to perform 3D ERT and IP survey. Up to 3200W (800V*4A) can be transmitted under this mode. If ERT cabling is insufficient, limited cabling can be deployed in a dual-direction shifting combination or multiple paralleled 2D survey line data fusion method to cover a larger 3D region.

  • Supported 3D arrays(click for details)

    Mid gradient
  • High power IP mid gradient scanning

    Geomative is the first in the industry to adopt ERT modules in the high-powered IP mid-gradient cross-sectional profiling. Similar to the ERT method, clients can deploy a pair of AB electrodes and multiple sets of non-polarizable electrodes. AB transmitting electrode is connected to the AB terminal port on the GD-20, while the non-polarizable electrodes are connected to the ERT cables takeouts. During IP survey, the host instrument emits electrical signal simultaneously and sequentially select MN electrodes in automated mode. Under sufficient amount of cabling and electrodes, the whole lateral cross-sectional profiling can be accomplished in one run, with a significant enhancement in survey efficiency. If signal emission is performed using external transmitter, clients can simply connect the AB terminal port of GD-20 host to the emission circuit in series. GD-10 will automatically monitor and detect the transmitted electrical signals, triggering and synchronizing the MN acquisition channels simultaneously.

  • Features

    GD-20 system has rich and powerful software functionalities, assisting clients to resolve multiple complications during field survey, enhancing survey efficiency and data quality. Detailed functionality is introduced below (click for details):

    Set the start/end electrodes
    Skip takeouts
    Ignore take-out
    Set the start/end layers
    Contact resistance
    Multi-dimensional data display
    Multi-array test
    Roll-along testing
    Sampling interval
  • Software upgrading and scalability

    GD-20 monitoring host adopted upgradable design where the embedded software is fully upgradable. All clients are entitled to lifetime software upgrade service and enjoy the following benefits!

    -   Gather demands and suggestions from clients worldwide and develop new functionalities, which would be implemented in new software versions to share these whole new global experiences.

    -   Apart from software upgrades, GD-20 also provides high, medium, entry class level hardware, enabling every client to find models suited to their budget and requirements. As our clients’ business expands, when they have sufficient budget and demands for more advanced model, they can easily upgrade their instruments through license upgrading and purchasing relevant accessories.

    GD-20 monitoring host models are comprised of Senior, Supreme 2D/3D, Supreme 2D+/3D+. Detailed introductions to all the models are as follows:

    GD-20 Senior
    GD-20 Supreme 2D/3D
    GD-20 Supreme 2D+/3D+

Product features

Unique sectional centralized mode of GD-20 measurement system

GD-20 series is designed with unique sectional centralized survey layout mode. This technique fully integrated the advantages of both conventional centralized cabling system and distributed cabling system, incorporating the advantages of simple cabling placement and long profiling survey from distributed system, and the simple, reliable and low-cost characteristic from centralized cabling system.

Multidimensional data display, Discover and deal with all issues on-the-spot, instant positioning

Monitoring host instrument provides extremely rich software functionality, to assist clients in handling issues and adjusting settings under different field applications. This allows the data recording of various ambient data and survey procedures in a fashion as real, complete, objective as possible. Detailed functionalities are as follow:

  • It has alarms for the open circuit, the short circuit and the current voltage out-range, and problems can be found timely and solved instantly.
  • Scatter plot illustrates the R0 oscillation degree of each layers to directly determine data quality
  • Voltage-current plot of each survey points can be examined. Attenuation curves are shown for IP surveys and evaluate data quality through the curves.
  • R0 profiles is shown and markers can be manually edited for easy observation.
  • Main interface displays I, V, R0, η, M, the electrode locations of A, B, M and N. The bottom greyed interface shows the grayscale bar of V, I, R0, standard deviation at any specific survey locations. Total survey points, remaining survey points and estimated time remaining are also displayed during data acquisition.

Rich array database and customized array scripts

Different geophysical exploration may encounter vast difference in their survey objective, environment, approach, response signal and so on. Survey methods should hence be robust and flexible enough to tackle all possible scenarios. Based on programmable and customizable survey concept, Geomative introduced survey scripting method, enabling clients to plan detailed survey configurations, electrode location and stacking amount, prior to their field surveys.

After array configuration is selected, Geomative Studio automatically generates survey script according to array required electrode location relationship. Clients can preset filter conditions to pinpoint the targeted region. Monitoring host skips trivial survey points during field survey and only measures data points within the targeted region, which would effectively shorten the overall measurement duration efficiently.

Stacking amount can be defined in the scripts by survey points or layers. Measurement can be conducted faster for stronger signals at shallow layers without any data stackings. As for deeper layers with weaker signals, data stacking amount is required to enhance survey accuracy. Survey point measurement sequence adjustment to increase the survey interval between neighboring survey points can reduce the noise interferences between the neighboring points. If customized survey configuration is required, the array relationship of electrode locations can be fully defined by clients by using Microsoft® Excel to edit survey point configuration and  perform customized measurements.

  • Comprehensive standard array database, including Wenner, Schlumberger, Wenner-Schlumberger, Pole-Pole, Pole-Dipole, Dipole-Dipole, Crosshole Dipole-Dipole, Bipole-dipole arrays and so forth.
  • Support three types of array survey method, including survey by layer, roll-along survey, survey by interval skipping.
  • Support self-defined scripts and script cropping

Powerful roll-along survey, 3D and pseudo-3D profiling

  • Roll-along testing, no repeated survey points, robust roll-along approach and highly efficient.
  • Efficient pseudo 3D mid-gradient profiling.
  • Distributed 3D survey , separated transmitter and receiver to achieve high current survey.

Takeout skipping at equal intervals, empty multiple arbitrary takeouts, automatically remove defined survey points, achieve large-spacing survey using small-spacing cabling layout

  • Takeout skipping function can be used to increase survey spacing, up to four takeout spacing skipping is supported.
  • When arbitrary takeouts cannot be connected to electrodes or is broken, takeout skipping function can be activated to resolve this issue to prevent anomalies in measured dataset.

Robust, efficient, simple cabling placement, dual-takeout mode doubles up current threshold value

  • Rapid cabling placement, flexible monitoring host placement location and can be placed arbitrarily at any cable connectors.
  • In dual-takeout mode, the upper limit of the varying current increases from 2A to 4A, enhancing signal and data quality simultaneously.

Direct stacking of electrical resistivity, satisfying clients’ needs for data quality and survey efficiency enhancement

  • Monitoring host intelligently identify data quality, automatically activate data stacking for survey points with bad data quality to reduce random noise interference to dataset.

Perfect DC resolution

  • BP-450 power supply, lithium battery, compact and high C/P value, supports three voltage level of 150V, 300V and 450V with current limitation function.
  • GP-5000 current rectifier supports maximum power of 5kW, established on the latest digital power supply technique with adjustable output voltage range of 50-1000V, maximum current of 5A and conversion efficiency over 90%.
  • BP145 power supply supports three voltage level testing of 48V, 96V and 144V. Supports up to 2A current output and multiple host series connection. High stability and reliability with high C/P value.

Product Accessories

  • GD-20 mainframe
  • CE5 Multi-electrode cable
  • SR-20 cable leader
  • 12-channel switching
  • 5-channel switching
  • BP-145 power
  • BP-450 power
  • Electrodes
  • Mainframe accessories
  • GP-5000 rectifier
  • CE10 Multi-electrode cable



  • Built-in battery: 16.8V lithium battery
  • Charging voltage: 120~250VAC(50HZ/60HZ)
  • Display screen: 5.7-inch full-color LCD screen, 640*480
  • External power: DC24~60V
  • Memory capacity: 8GB
  • Operating humidity: ≤95%
  • Size: 39cm*20cm*29cm
  • Storage temperature: -50℃~+50℃
  • Weight: 8.5KG
  • Working temperature: -20℃~+70℃


  • Accuracy: 0.3%±1uV
  • Dynamic Averaging: 24bits A/D conversion
  • Noise rejection: ≥120dB
  • SP compensation: ±10V
  • Stacking: 1~255 times
  • Voltage range: ±24V


  • Current accuracy: 0.3%±1uA
  • Input impedance: ≥200MΩ
  • Maximum Tx power: 3200W
  • Maximum Tx Voltage: 4A
  • Maximum Tx Voltage: 800V
  • Protection: IP65, over-current, over-voltage, short circuit
  • Pulse type: square wave
  • Pulse width: 0.25s、0.5s、1s、2s、4s、8s、16s
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