New Geological Survey Equipment Resistivity Geophysic Study Meter For Earth Exploration
Overview
WDJD-3A Multi-Function Digital DC Resistivity/IP Meter (hereafter also referred to as WDJD-3A or WDJD-3A mainframe), based on years of experience of design and manufacture, meets user's most and latest needs. It features multiple functions, high accuracy, fast speed, high reliability and excellent expandability. Measured data of WDJD-3A can be processed by other multi-electrode resistivity software, which makes the interpretation more convenient. The single WDJD-3A can conduct general electrical resistivity/IP survey. If WDJD-3A is used together with WDZJ-4 multiplex electrode switcher (hereafter also referred to as WDZJ or WDZJ-4 switcher), it can conduct multi-electrode 2D Resistivity imaging. Application of WDJD-3A can be in metal and nonmetal mineral resources detection, city geophysical exploration, railway and bridge inspection and so on; as well as in hydrology and engineering geology such as seeking for ground water, inspect dam base and flood protection levee for incipient faults. What's more, it also used for geothermal prospecting. In view of several functions of WDJD-3A, this user's manual devotes on introduction to each function. The first Section (Section One) in this user's manual devotes on
introduction to WDJD-3A itself and related components, in Section Two is
pre-measuring procedures. Section Three gives operating procedure guide to general resistivity/IP survey. Section Four focuses on operation guide to multi-electrode 2D resistivity imaging.
Main application
1. Widely used for high-resolution research, tomography and monitoring applications.
2. Coal mining gobs, caves of Custer area, geological disasters survey like landslides other geological disasters.
3. High resolution engineering geological exploration like factory foundations, highways, bridges, railways, civil engineering, hydrology, engineering, environmental.
4. For landslides and other geological disaster exploration.
5. Metal and non-metallic mineral resources exploration and geothermal exploration
Assembly data acquisition devices and multiplexer together in the same case, which not only reduce the volume but also decrease the weight, thus avoid errors caused by operating the devices separately and due to inconformity of switch parameter settings.
Main Features & Founction
*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.
*System turns off WDJD-3A mainframe automatically if there is no operation in 10 minutes.
*High anti-interference performance and precision, integrated with multistage wave filtration and signal enhancement technologies.
*In good condition, multi-electrode imaging function can complete measurement of a 552-data-points cross section.
*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 through WDJD-3A mainframe.
*Simple calculator fulfills calculation of geometric factor and other calculations on the spot.
*For general resistivity and IP survey function, 8 types of electrode arrays are available. Electrode distance (namely "Schedule") can be inputted or called. Geometric factor K can also be generated automatically or calculated manually.
*For multi-electrode 2D resistivity imaging function, 18 types of electrode arrays are available. Extendable cross-section roll-along scan measurement allows the measuring cross-section to be prolonged unlimitedly without adding more electrodes. It is suitable for long cross-section survey and for solving geologic problems under any condition with low cost and high efficiency.
*Schedule: the schedule can memorize 100 groups of electrode distances, avoiding repetitive input. Or you just input a schedule ID and set step to call the corresponding electrode distances.
*Earth resistance inspection: earthing condition can be inspected at any time.
Mass data storage: WDJD-3A can memorize 3500 readings of data for resistivity and SP survey, 2500 readings of data for induced polarization (chargeability) survey and 43680 readings of data for multi-electrode 2D Resistivity Imaging.
*All parameter and data are under power-failure protection; and thus data will not be lost even thought the system shuts down accidentally.
*RS-232C port enables it to transfer data to computer.
*Diagnostic program finds fault or failure and damaged parts quickly and accurately.
*Sealed constitution: featuring waterproof and dustproof design, long life time and so on.
Product Parameters
|
Receiving part |
|
Voltage precision |
±24V,±0.4%,±1LSB,24 bit A/D |
|
Input impedance |
≥50MΩ |
|
Apparent polarizability precision |
±1% ± 1LSB |
|
SP compensation range |
±10V |
|
Current channel |
6A,±0.4%,±1LSB,24 bit A/D |
|
Resolution |
Voltage:0.1 micro volt, Current:0.2 micro ampere |
|
Suppression |
≥80dB for 50Hz industrial frequency
(common mode interference or differential mode interderence) |
|
Transmitter part |
|
Voltage precision |
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 |
|
Input impedance |
For general Res/IP sounding,±1100V(2200V peak to peak).
For multi-electrode Res imaging, 450V DC(limited by WDZJ-4 switcher) |
|
Apparent polarizability precision |
For general Res/IP sounding,±6A.
For multi-electrode Res imaging, 2.5A DC(limited by WDZJ-4 switcher) |
|
SP compensation range |
1~60s, duty ratio 1:1 |
|
Others |
|
Display |
160×160 dot matrix LCD |
|
Storage |
≤1GB |
|
Working temperature |
-10ºC~50ºC, 95 %RH |
|
Storage temperature |
-20ºC~60ºC |
|
Instrument power |
Internal 12V 9Ah rechargeable battery,lasts for 30hours(or 12V external power supply) |
|
Weight |
≤4.4kg |
|
Dimension(L×W×H) |
270mm×246mm×185mm |
Working Principle:
The multifunctional digital DC IP instrument explores underground geological conditions by measuring the differences in IP effects of different rocks and minerals, that is, by observing and studying the IP effect of the earth. This technology is based on the double layer theory at the interface between rock particles and the surrounding solution, and believes that the induced polarization effect of rocks is related to the double layer at the interface between rock particles and the surrounding solution. When an external current acts on the surface of rock particles, the cations in the double layer dispersion zone move to form a double layer deformation. When the external current is cut off, the accumulated ions discharge to restore to a state of equilibrium, thereby observing the induced polarization electric field. The speed of the formation of this double layer deformation induced polarization and the speed of discharge are determined by the speed and path length of the ions moving along the particle surface. Therefore, larger rock particles will have a larger time constant (that is, the speed of charging or discharging).
FAQ
1Q.: What is a digital DC induced polarizer?
1A: A digital DC induced polarizer is an instrument used to measure and analyze the performance of a DC power supply. It can measure parameters such as voltage, current, and power, and has data recording, analysis, and display functions.
2. What is the main purpose of a digital DC induced polarizer?
Answer: A digital DC induced polarizer is mainly used in the fields of power research and development, production, and maintenance, such as performance testing and fault diagnosis of equipment such as batteries, chargers, and power adapters.
3. What are the main functions of a digital DC induced polarizer?
Answer: The main functions of a digital DC induced polarizer include: voltage, current, and power measurement; voltage and current waveform display; data recording and analysis; overvoltage and overcurrent protection, etc.
4. How to use a digital DC induced polarizer correctly?
Answer: First, connect the digital DC induced polarizer to the device under test, then turn on the power of the instrument and select the corresponding measurement mode and parameters. During the measurement process, pay attention to the display and indication of the instrument to avoid overload or short circuit. After the measurement, turn off the power of the instrument and disconnect it.
5. What are the maintenance and care methods for a digital DC induced polarizer?
A: To ensure the accuracy and stability of the digital DC IP instrument, it should be calibrated and cleaned regularly. Avoid exposing the instrument to high temperatures, humidity or corrosive environments. During use, follow the instructions in the operating manual to avoid damage to the instrument due to misoperation. If any abnormality is found in the instrument, contact a professional for inspection and repair in a timely manner.
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