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WGMD-5 2-D Multi-electrode Resistivity Surveying System
WGMD-5 distributed 2-D multi-electrode resistivity surveying system is composed of WGMD-5 mainframe, PDS-1 distributed switcher adapter, distributed switching cable and electrodes. WGMD-5 has all the functions of WDJD-3 multi-function digital DC resistivity & IP instrument. It is capable of surveying general resistivity as well as surveying 2-D multi-electrode resistivity.
WGMD-5 features mass memory capability, quick and accurate measurement, convenient operation, etc. It is compatible with some other software for multi-electrode measuring meters, so that the interpretation is convenient and direct. In addition to wide applications in energy resources exploration and city geophysical prospecting, railway and bridge inspecting, mental and non-mental mineral resources survey, it is also used in hydrology and engineering geological prospecting, such as researching for groundwater, inspecting water reservoir dam and flood protection dam for incipient faults. Besides, it contributes to geothermal survey. |
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Main Features
- One instrument with multiple functions---- It is able to do general resistivity survey and 2-D multi-electrode resistivity survey.
- Accurate and highly efficient: Without cost of repeatability, only 15 minutes is needed to finish surveying a cross section (2-D or 3-D).
- Mass data storage---- For 2-D survey in mode I (only data of resistivity), over 43680 sets of measuring results could be stored. For 2-D survey in mode II (resistivity and current), over 21840 sets of measuring results could be stored. All of these data would not loss when power is cut off.
- Measuring data of different modes are able to coexist, which include data of general resistivity, 2-D and 3-D multi-electrode resistivity and 2-D multi-electrode induced polarizability. These different data do not disturb each other.
- Earth resistance check: convenient and quick earthing check at any time in field.
- Electrode arrays: for 2-D multi-electrode survey, more than 18 electrode arrays support, extendable. Either the cross section may be a fixed reference to be scanned (in this case, electrode arrays are AMNBABMN, AMBN, AMN, MNB, A-MN-B, SP-M, SP-MN, charge M, charge MN), or the cross section rolls continuously to be scanned (in this case, electrode arrays are A-M, A-MN, AB-M, ABCMN, MN-B, A-MN square, A-MN-B, cross-hole dipole). For the latter, length of cross section is allowed to be extended infinitely while electrodes are fixed. This facilitates tracing long cross section with low cost and high efficiency.
- For 2-D multi-electrode measurement, initial electrodes to be surveyed are defined by user, convenient and flexible for operation.
WGMD-5 as Mainframe
WGMD-5 main unit is designed not only for multi-electrode measurement but also for conventional 1-D measurement. As a transmitter and receiver all-in-one instrument, it can perform resistivity, induced polarization (IP) as well as 2-D multi-electrode resistivity measurement. It is feasured with compact size, super-low power comsuption and quite remarkable accuracy and consistancy.
Transmitting Specification
- Maximum voltage: 900V
- Maximum current: 5A
Receiving Specification |
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- Voltage:
 6V;
- Accuracy: if Vp
 10mV, then 5 1 LSB; if Vp<10mV, then 1%1 LSB.
- Current: 5 A
- Measurement accuracy: if IP10mA, 51LSB; if IP<10mA,1%1LSB
- Apparent resistivity measurement precision: 1%1LSB
- Suppression: 80dB for 50Hz or 60Hz (industrial frequency interference);
- Input impedance: 50M
General Specification
- Device current: 55mA
- Power supply: 8 D-size batteries (or nickel-cadmium batteries of the same specs)
- Working temperature: -10
 +50 (Environmental), 95%RH
- Weight: 6Kg
- Dimension: 310mmx210mmx210 mm
PDS-1 Distributed Switcher Adapter
- High voltage, maximum voltage reaches 800V; maximum current reaches 3A.
- Polyurethane coated cable designed for field survey, of high reliability, performance and anti-interference performance.
- Industrial PC controlled, accurate, reliable and quick
- Insulation: cable between A, B connecting ports and cable between A, B connecting port and the low voltage connecting port, insulation is more than 1000M/1000V; cable between low voltage connecting ports, insulation is more than 500M/500V.
- Connection to mainframe: A, B, M, N connecting ports and RS-232 port
- Connection to cable switch box: 12-pin socket
- Power supply: 18 D-size batteries (or nickel-cadmium batteries of the same specs); or powered by external 24V power supply.
- Working temperature: -10~+50 (Environmental);
- Weight: 2kg
- Demission: 220mmx130mmx210mm
Switching Cable and Stainless Electrodes
- Cable: polyurethane coated, outer diameter is
 9mm
- Electrodes can be additionally added to the switching cable chain, convenient and flexible.
- With functions of electrode check and recheck after switch setup, avoiding incorrect setup
- Without limitation on electrode arrays
- Stainless springs link the stainless electrodes and cable switch box together, reliable and convenient.
- 10 channels/chain (each cable chain can connect with 10 electrodes)
- Distance between adjacent cable switch boxes: 1~10m (customized according to order)
- Box size: 25mm110mm (only the box), 25mm170mm (including the rubber head)
- Maximum voltage: 800V
- Maximum current: 3A
- Cable insulation: cable between A, B connecting ports and cable between A, B connecting port and the low voltage connecting port, insulation is more than 1000M/1000V; cable between low voltage connecting ports, insulation is more than 500M/500V.
- Working temperature: -20~+70 (Environmental);
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