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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