WDJD-3A Resistivity & IP Sounding Meter

Eletrical prospecting for groundwater is the most economic, effective and widely used method. WDJD-4 is a specific prospecting equipment for groundwater, with the most parameters, various functions, and the most advanced performance at present. WDJD-3A is specific instrument prospecting for groundwater, with the most parameters, various funcitons, and the most advanced performance at present.

Vertical electrical sounding (VES) is a geophysical method for investigation of a geological medium. The method is based on the estimation of the electrical conductivity or resistivity of the medium. The estimation is performed based on the measurement of voltage of electrical field induced by the distant grounded electrodes (current electrodes).

1D VES - resistivity                                                                        1D VES - IP  



* WDJD-4 catalogue

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WDJD-3A Earth Resistivity/IP Meter is not only support SP survey, VES sounding as well as 2D Resistivity imaging with 2D imaging survey accessories, for more details, please refer here: WERT series 2D Resistivity Tomography System.


•   Underground water inspection
•   Engineering geology inspecting as dam base exploration and flood
•   Metal source exploration
•   Non-metal source exploration
•   City geophysical exploration
•   Railway and bridge

Arrays (up to 11 kinds):

•   4P-VES (sclumberger&Wenner)
•   3P-VES •   Dipole-dipole(VES)
•   3P Composite Profiling
•   4P Electrical Profiling •   Mid-grandient
•   5P-VES •   IP-BUR ......

Main Features:

•   Transmitting unit and receiving unit are of all-in-one design, portable and lightweight.
•   CMOS large-scale integrated circuit, special stand-by mode, compact size, low power consumption yet multi-function; system automatically cuts off power supply if there is no operation on it in 10 minutes.
•   High anti-interference performance and measuring precision, integrated with multistage wave filtration and signal enhancement technologies.
•   Automatically achieving compensation of self-potential, drift and electrode polarization.
•   Receiving unit supports transient over-voltage protection, transmitting unit supports over-voltage protection, over-current protection and AB open-circuit protection.
•   Measured curve can be plotted on the display directly and clearly.
•   Large display screen, English edition keypad and menu, flexible for operation.
•   Setting working period freely, 10 kinds of common array configurations are available; electrode distance is inputted and array factor could be calculated automatically.
•   Electrode distance table: memorizing 100 different groups of distances among the electrodes, avoiding repetitive input; input number can call the electrode distances to function or to reset.
•   Earth resistance inspection: Earth condition of the electrodes can be inspected at any time.
•   Mass data storage: able to memorize maximum 3500 readings of survey points.
•   All parameter and data are under power-failure protection; and thus data will not loss when system shutdown or changing battery.
•   Diagnostic program finds fault or failure and damaged parts quickly and accurately.
•   Sealed constitution: feature waterproof and dustproof design, long lifetime.


Technical Specification

Voltage channel ± 6V, ±1 % ± 1LSB
Input impedance
Apparent polarizability precision ±1% ± 1LSB
SP compensation range ±1V
Current channel 6A, 24 bit A/D
Suppression suppression is over 80dB for 50Hz industrial frequency (common mode interference or differential mode interference)

Maximum transmitting power 4500W
Maximum voltage range
Maximum current range 5A
Voltage channel  ±24A, 24 bit A/D
Input resistance ≥50MΩ

Working temperature -10℃~+50℃, 95 %RH
Storage temperature
Instrument power
eight size-D dry cells
Overall current
≤ 55mA
≤ 7Kg
Dimension (L×W×H) 310mm * 210mm * 210mm


In order to ensure the safety of customers, our sales department only keeps the following email addresses:

- Sales@langeoinstrument.com
- Emily.chou@langeoinstrument.com
Other mailboxes are unofficial, please note.