DC Resistivity And Induced Polarization Methods Geophysical Resistivity Survey

The WDJD-3A Multi-Function Digital DC Resistivity/IP Meter is an ideal instrument for individuals who require precise measurements with rapidity, dependability, and outstanding scalability. With years of design and manufacturing expertise, we have produced a product that satisfies the most recent user demands. Other multi-electrode resistivity software can process the WDJD-3A measured data, allowing for more convenient result interpretation.

Application

• Mineral prospecting in geological surveys - identify potential mineral deposits.
• Groundwater exploration - locate and assess water resources.
• Environmental investigations - identify contamination and remediation sites.
• Engineering projects - determine foundation stability and soil mechanics.
• Archaeological studies - detect buried structures and artifacts.
• Civil engineering - determine soil composition and geotechnical properties.

What is induced polarization surveying?

Induced polarization (IP) is the Earth’s capacity to hold an electric charge over time. IP measures the voltage decay curve after the injected current is shut off. The higher the IP, the longer over time the charge is held—IP decays over time, typically a few seconds but sometimes up to minutes, and will eventually disappear. IP is especially useful for mineral exploration applications.

Why is induced polarization surveying important?

The induced polarization method makes use of the capacitive action of the subsurface to locate zones where clay and other chargeable minerals are located within the host rock. With IP, you can tell very distinctly what is in the ground if it holds a charge because you end up with two maps—i.e., resistivity and IP—at the same time.

This is important for mineral exploration—identifying economically important minerals, including gold, copper, and silver. Early on, pyrite and massive sulfide minerals were deposited by hydrothermal fluids. These minerals have a huge IP signature, especially when disseminated as smaller grain in a rock matrix, which we can use when exploring for these minerals.

WDJD-3A Multi-Function Digital DC Resistivity/IP Meter

Receiving unit:

• Voltage channel: ± 6V, precision: if Vp≥10mV, ± 5‰ ± 1LSB; if Vp < 10mV, ±1% ±1LSB.
• Input impedance: ≥50MΩ
• Apparent polarizability precision: ±1% ± 1LSB
• SP compensation range: ±1V
• Current channel: 5 A, precision: if Ip≥ 10mA, ± 5‰ ± 1 LSB; if Ip < 10 mA, ±1% ±1 LSB.
• Suppression: ≥80dB for 50Hz frequency industrial and electrical interference(common mode interference or differential mode interference).

Transmitting unit:

• Maximum transmitting power: 4500W (only when conducting general resistivity/IP survey. Regarding multi-electrode resistivity imaging, maximum transmitting power is 1125W which is limited by WDZJ-4 switcher)
• Maximum voltage output: 900V (1800V peak to peak, only for general resistivity/IP survey. Regarding multi-electrode resistivity imaging, maximum transmitting voltage is 450V DC which is limited by WDZJ-4 switcher)
• Maximum current output: 5A (only for general resistivity/IP survey. Regarding multi-electrode resistivity imaging, maximum current output is 2.5A DC which is limited by WDZJ-4 switcher)
• Pulse width: 1~60s, duty ratio 1:1

Others:

• Working temperature: -10℃~50℃, 95 %RH
• Storage temperature: -20℃~60℃
• Mainframe power source: eight size-D dry cells (or nickel-cadmium batteries of the same specification)
• Overall current: ≤ 55mA
• Weight: ≤ 7 Kg
• Dimension (L×W×H): 310mm x 210mm x 210mm
• Working temperature: -10°C~50°C

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