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Product Details

Resistivity Meter/Electrical imaging with Multi Electrode

Instroduction

WDJD-4 Multi-function Digital DC Resistivity/IP Meter is the updated model of WDJD-3 multi-function digital DC Res/IP terrameter, which install a 12V rechargeable battery.

It features multiple functions, high accuracy, fast speed, high reliability and excellent expandability. Measured data of WDJD-4 can be processed by other multi-electrode resistivity software, which makes the interpretation more convenient.

Applications

• Metal and nonmetal mineral resources detection
• City geophysical exploration, railway and bridge inspection

• Hydrology and engineering geology as seeking for ground water, inspecting dam base and flood protection levee for incipient faults

• Geothermal prospecting

Functions

• 1D resistivity sounding

• 1D induced polarization sounding

• 2D Resistivity imaging

Features

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

• 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.

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

• Receiving unit support transient over-voltage protection, transmitting unit supports over-voltage

protection, over-current protection and AB open-circuit protection.

• For general resistivity and IP survey function, 9 types of electrode arrays are available. Electrode distanc ( 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).

• 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.

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

• 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).

• All parameter and data are under power-failure protection; and thus data will not be lost even thought

the system shuts down accidentally.

• USB port enables it to transfer data to computer.

Specifications

WDJD-4 Res/IP Meter
Receiving
Voltage precision	If Vp≥10mV, ± 5‰ ± 1LSB; if Vp < 10mV, ±1% ± 1LSB.
Input impedance	≥50MΩ
Apparent polarizability precision	±1% ± 1LSB
SP compensation range	±10V
Current channel	6 A, ±0.4% ± 1LSB, 24 bit A/D
Current precision	If Ip≥ 10mA, ± 5‰ ± 1 LSB; if Ip < 10 mA, ±1% ± 1 LSB.
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 voltage	For general Res/IP sounding, ±1100V (2200V peak to peak) For multi-electrode Res imaging, 450V DC (limited by WDZJ-4 switcher)
Max current	For general Res/IP sounding, ±6A For multi-electrode Res imaging, 2.5A DC (limited by WDZJ-4 switcher
Pulse width	1~60s, duty ratio 1:1
Others
Display	160 × 160 dot matrix LCD
Storage	≤1GB
Working temperature	-10℃~+50℃, 95 %RH
Storage temperature	-20℃~+60℃
Instrument power	internal 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 connected	60 and 120 (for option)
Insulation impedance	≥500MΩ
Max working voltage	500V_DC
Max working current	2.5A_DC
Power supply	Internal 7.4V 4AH rechargeable lithium battery, last for continuously 25 hours work
Working temperature	-10°C~+50°C

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