• 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 series Geoelectric system

    is a newly developed new type of electrical system with a large number of breakthroughs compared with similar products. It can be configured as 5 and 12 channel data acquisition system with multi-channel and high-efficiency. up to 12 data acquisition, greatly improve the efficiency of field work.


    What are the applications used?

    Fine engineering and foundation exploration, tectonics, fault and base exploration, exploration of mineral resources, detection of groundwater and groundwater pollution range, exploration of landfill sites and their seepage range, detection of oil depot pollution range, detection of old coal mines and underground caverns, Embankment, dam disease detection and stability monitoring, observation of underground resistivity changes with time and distance to monitor the earthquake precursors and levees. Advanced 2D and 3D device for high-density cross-section testing.

Product function

  • Special functions

    The GD-20 system has plenty of software functions to solve all kinds of difficulties in the measuring process for users and improve the efficiency of testing and the data quality. Detailed functions are described below, please click to view:

  • 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)
  • Detailed data presentation:
    - clearly task interface
    - Test data scatter diagram, real-time rendering, convenient and timely analysis of data
    - Export excel and dat format data and save them directly to SD card

    VES (Verticle Electrical Sounding)
    VES IP(Induced polarization) Sounding
    VES Spontaneous Polarization
  • 2D 高密度电阻率
    2D 高密度自电
  • 3D ERT
    3D ERT(IP)
  • Cross-hole
  • 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 array configurations (click for details)

    Edge Gradient
    Double Side-3P
    Cross-Hole Dipole
    Bipole Up-Hole
    Customized arrays
  • 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.

  • 剖面图

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:

  • 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.

Automated stacking for data quality enhancement

During the data measurement process, GD-10 automatically analyzes signal strength and data quality to determine whether long measurement period and stacking mode should be activated. For sites with strong signal and good data quality, measurement system continuously sweep and scans in high efficiency mode until bad data quality is detected, in which long measurement period or stacking mode would be elaborated to enhance data quality to the maximum extent. Clients can also set stacking amount according to any survey points, survey layers or individual tasks.

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

  • CE10 Multi-electrode cable
  • SR-20 cable leader
  • 12-channel switching
  • 5-channel switching
  • BP-145 power
  • BP-450 power
  • Electrodes
  • Mainframe accessories



  • Charging voltage: 100V~250V(50HZ&60HZ)
  • Built-in battery: 16.8V锂电池
  • External power: 30V~60V直流
  • Memory capacity: 8G
  • Size: 39cm*20cm*29cm
  • Working temperature: -20℃~+70℃
  • Operating humidity: 95%
  • Display screen: 5.7寸全彩液晶屏,640*480
  • Weight: 8KG


  • Accuracy: 0.3%±1uV
  • SP compensation: 10V
  • Voltage range: 24V
  • Noise rejection: ≥95dB


  • Input impedance: >100M欧姆
  • Pulse type: 方波
  • Pulse width: 0.25s、0.5s、1s、2s、4s、8s、16s
  • Current accuracy: 0.3%±1uA
  • Maximum Tx Voltage: 4A
  • Maximum Tx Voltage: 800V
  • Maximum Tx power: 3200W
  • Protection: 过压、过流、短路、高温
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