WGMD-9 2D/3D Electrical Imaging System

WDA-1/WDA-1B Super Digital DC Resistivity/IP Meter is developed basing on years’ experience of studying and manufacturing advanced electrical resistivity instruments. It's leading technical characteristics and function are much superior to the instruments of its kind worldwide. The mainframe, WDA-1/WDA-1B super digital DC resistivity/IP meter, is a newly developed electrical method instrument, adopting many advanced technologies such as tablet PC, 24bit A/D, and high power control. It features compact size and lightweight. It's main performance and functions are better than its similar products at home and abroad.

WDA-1/WDA-1B system (or WGMD-9 system) can conduct:

•   Self-potential survey
•   General resistivity/IP VES survey
•   Multi-electrode 2D resistivity imaging
•   Multi-electrode 2D induced polarization (IP) imaging
•   Multi-electrode 3D resistivity imaging

Typical 1-D resistivity sounding surveys usually involve about 10 to 20 readings, while 2-D imaging surveys involve about 100 to 1000 measurements. In comparison, a 3-D survey might involve several thousand measurements.


•   Energy resource        
•   City geophysical exploration
•   Railway and bridge prospecting
•   Metal and non-metal mineral resources prospecting
•   City geophysical exploration
  Hydrology and engineering geology to inspect base of dam and flood protection levee for incipient faults
•   Geothermal survey
•   Landslides and other geological disaster exploration



* WGMD-9 catalogue

Contact us


Whatsapp:0086 15986731215

Main features:

•   Portability and flexibility: the transmitting unit and the receiving unit are designed in one device, small and lightweight. The 96V internal battery of WDA-1B mainframe can conduct multi-electrode imaging in wide variety of environments.
•   Unique and open measuring process control. User-defined power-on time and power-off time controls measuring process. The main frame can also monitor variation of electrode potential automatically. If the parameter exceeds the user-defined over-variation limit, it stops measuring, and wait to measure again until it becomes stable. Thanks to this function, WDA-1/WDA-1B system can ensure accurate measured result even in harsh environment.
•   WDA-1/WDA-1B is designed with two cable sockets which enable cross-hole electrode array configuration works without switching control unit, and thus makes the measuring process much simpler and easier.
•   Multiple functions: voltage and current range and small signal accuracy are allowed to increase dramatically, which makes it suitable to work with rock sampling tester, high-power IP receiver, general electrical method instrument, IP instrument, water finder, 2D and 3D multi-electrode electrical method instrument, etc.
•   Measuring various parameters, wide application: it is able to acquire data of voltage (VP), current (IP), apparent resistivity (R0), Self-Potential (SP), apparent polarizability (M~M7), metal factor (G1~G7), half decay time (TH), deviation (r), induce polarization ratio (J), etc.
ID sounding curvey           2D resistivity imaging interface        2D data interface       3D imaging survey interface
•  High power supply, wide current range, high accuracy: maximum power reaches 7200W (1200V×6A), voltage input is 64Vp-p, small signal measurement precision is high (voltage is less than 0.1mV and current is less than 0.1mA with ±1% measurement precision), both of which make WDA-1/WDA-1B main frame an ideal device for regions of high resistivity and to achieve better measured results.
•   On its panel there is an “B(∞)” port for pole-pole and dipole-pole electrode array. As to dipole-pole array configuration, ResA, ResB, and Res can be measured automatically with high efficiency and fewer errors.
•   16 kinds of electrode arrays of multi-electrode system: In addition to the 10    electrode arrays of general electrical resistivity survey system, there are 16 electrode arrays for multi-electrode imaging, namely, Wenner Alpha array (WENNER α), Wenner Beta array (WENNER β), Wenner Gamma array (WENNER γ), Three-pole direct array (δA ARRAY), Three-pole reverse array (δB ARRAY), Wenner Alpha 2 array (SCHLMBG), Self-Potential M array (SP-M), Self-Potential MN array (SP-MN), Charging M (CHG-M), Charging MN (CHG-MN), Two-pole Roll along array (2P AM), Three-pole Roll along array (3P A-MN and 3P AB-M), Dipole-dipole Roll along array (DIPOLE), MN-B, Cross-Hole Dipole/Equatorial Dipole-dipole array (CR-DIPOLE).
•   Extendable system: data sampling and storing are controlled by pocket PC. Data management is easy. Software is flexible to be upgraded and extended (extending data storage capacity and collection software functions, also extend to special multi-electrode electrical instrument).
•   Excellent anti-interface performance: integrated with multistage filtration and signal enhancement technologies and suppresser against common mode interference and differential mode interference. Measurement precision is high.
•   Automatically achieving SP, drift and electrode compensation (maximum compensation reaches ±10V).
•  Receiving unit supports transient over-voltage protection for input voltage; transmitting unit supports over-voltage protection, over-current protection and AB open-circuit protection as well as DC high voltage reverse connection protection.
•   Earth resistance check: earth resistance of AB Current electrodes and MN Potential electrode can be inspected at any time.
•   Diagnosis program can find the fault or failure quickly and accurately.
•   Sealed constitution features waterproof and dust-proof design, long lifetime.
•   Flexible option of control: control unit may also be notebook PC to remotely manipulate measurement.

3D Resistivity Imaging Survey in Field   mainframe and cable

Technical Specifications:

WDA-1/WDA-1B Main Frame   (Standard)
Maximum transmitting power
Maximum supply voltage
Maximum supply current
Transmitting power pulse width
1~60s, duty cycle is 1:1.
±32V (24 bit A/D). If Vp≥5mV, accuracy is ±0.2% ±1LSB. If 0.1mV≤Vp<5mV,    accuracy is ±1% ±1LSB.
Input impedance
Apparent polarizability accuracy
SP compensation range ±10V
6A (24bit A/D). If Ip≥5mA, accuracy is ±0.2% ±1LSB. If 0.1mA≤Ip<5mA, accuracy is ±1% ±1LSB.
for 50Hz industrial frequency interference (common mode and differential mode interference), suppression is more than 80dB.
Power supply
internal 7.4V 4Ah rechargeable battery continuously lasts for 20 hours (or 12V external power supply).
Ports support (transmitting unit)
A, B, M and N connecting ports, DC high voltage input ports and external battery terminals, 2 cable ports, RS-232, Bluetooth.
Working temperature
-10℃~+50℃, 95%RH
Storage temperature
≤ 4kg (WDA-1)
≤ 6kg (WDA-1B)
270mm * 246mm * 123mm (WDA-1)
340mm * 295mm * 152mm (WDA-1B)
Internal power source (WDA-1B only) max voltage 200V (four notches, 50V, 100V, 150V and 200V); max current is 0.7A.

Intelligent Cable
polyurethane coated, outer diameter Φ8mm
up to order
Connector (take-out) number
10/sting (ten electrode per string)
Connector (take-out) spacing
5m or 10m (or up to order)
Connector size
Φ30mmx100mm (connector only),
Φ39mmx170mm (including rubber head)
Maximum voltage
Maximum current
Cable insulation
cable between A, B connecting ports and cable between A, B connecting ports and the low voltage connecting port, insulation is more than 1000MΩ/1000V; cable between low voltage connecting ports, insulation is more than 500MΩ/500V
Working temperature -20°C~+70°C

Stainless Steel Electrode for 2D/3D Resistivity Imaging   (Optional)
Stainless steel electrode
Φ10mm x 280mm, with stainless spring
Quantity                                                   up to order