2D Multi-electrode Resistivity & IP Survey System

Main Application:

1. Water resources, metal and nonmetal mineral resources detection

2. City geophysical exploration, railway and bridge inspection 

3. Hydrology and engineering geology as inspecting dam base and flood protection levee for incipient faults 

4. Geothermal prospecting

Function:   

1. 1D resistivity sounding 

2. 1D induced polarization sounding

3. 2D Electrical resistance tomographic

Main Features:

1. Transmitting unit and receiving unit are of all-in-one design, portable and lightweight.

2. Super high-power, high anti-interference performance and precision: up to 6600w (1100v×6A) power, 48Vp-p voltage range ensures to get a good result in a area with high resistance.

3. Automatically achieving compensation of self-potential, drift and electrode polarization, up to ±10V.

4. Receiving unit support transient over-voltage protection, transmitting unit supports over-voltage protection, over-current protection and AB open-circuit protection.

5. For general resistivity and IP survey function, 9 types of electrode arrays are available. Electrode distance (namely “Program”) can be inputted or called. Geometric factor K can also be generated automatically or calculated manually.

For multi-electrode 2D resistivity imaging, up to 18 electrode arrays are available. It could scanning measure according to fixed section (including AMNB, ABMN, AMBN, AMN, MNB, A-MN-B, Sp M, Sp MN, charge M, charge MN) or continuous rolling scanning measure according to variable section (including A-M, A-MN, AB-M, AB-MN, MN-B, A-MN rectangle).

1. Program: the program can memorize 100 groups of electrode distances, avoiding repetitive input. Or you just input a program Id and step to call the corresponding electrode distances.

2. Earth resistance inspection: ground condition can be inspected at any time.

3. Mass data storage: Up to 1GB capacity (extended) enable store 5,000,000 groups measuring data (including current, voltage, SP, Ro, Ms, metal factor, TH, R, J).

4. All parameter and data are under power-failure protection; and thus data will not be lost even thought the system shuts down accidentally.

5. USB port enables it to transfer data to computer.

Main Specification:

WDJD-4 Res/IP Meter

Receiving 

Voltage precision±24V, ±0.4% ± 1LSB, 24 bit A/D

Input impedance ≥50MΩ

Apparent polarizability precision±1% ± 1LSB

SP compensation range±10V

Current channel6 A, ±0.4% ± 1LSB, 24 bit A/D

ResolutionVoltage: 0.1 micro volt; Current: 0.2 micro ampere.

Suppression≥80dB for 50Hz industrial frequency (common mode interference or differential mode interference).

Transmitting 

Max transmitting power For general Res/IP sounding, 6600W.

For multi-electrode Res imaging, 1125W, limited by WDZJ-4 switcher

For Res cable, 1350W

For IP cable, 2400W

Max voltageFor general Res/IP sounding, ±1100V (2200V peak to peak)

For multi-electrode Res imaging, 450V DC (limited by WDZJ-4 switcher)

Max currentFor general Res/IP sounding, ±6A

For multi-electrode Res imaging, 2.5A DC (limited by WDZJ-4 switcher

Pulse width1~60s, duty ratio 1:1

Others 

Display160 × 160 dot matrix LCD

Storage≤1GB

Working temperature-10°C~+50°C, 95 %RH

Storage temperature-20°C~+60°C

Instrument powerinternal 12V 9Ah rechargeable battery , lasts for 30 hours (or 12V external power supply)

Weight≤ 4.4 Kg

Dimension (L×W×H)                270mm X 246mm X 175mm

WDZJ-4  Switcher

Max electrode connected60 and 120 (for option)

Insulation impedance≥500MΩ

Max working voltage500VDC

Max working current2.5ADC

Power supplyInternal 7.4V 4AH rechargeable lithium battery, last for continuously 25 hours work

Working temperature-10°C~+50°C