Main Features

• Truly one machine with multi-function- it is capable of normal resistivity survey, 2-D multi-electrode resistivity survey and 3-D multi-electrode resistivity survey.
• Accurate and highly efficient: under the good repeatability, less than 15 minutes for a section (2-D or 3-D).
• Super large storage: For 2-D survey in mode I (only resistivity), no less than 43680 times measurement. For 2-D survey in mode II (resistivity and current), no less than 21840 times measurement. For 3-D survey (apparent resistivity and supply current), no less than 32768 times measurement. No data loss when power off.
• Multiple mode data coexistence: normal resistivity method, 2-D and 3-D multi-electrode resistivity data, none interference from each other.
• Ground check: convenient and quick ground checks at any time in field.
• Electrode arrangement: more than 18 arrangement mode and extendable for 2-D survey. It is capable of not only fixed section scan measurement (AMNB、ABMN, AMBN, AMN, MNB, A-MN-B, SP-M, SP-MN, charge M, charge MN), but also changeable section continuous scan measurement (A-M, A-MN, AB-M, AB–MN, MN-B, A-MN square, A-MN-B, cross-hole dipole). Continuous scan measurement permits the any length of section while the electrode number is fixed. It is convenient for trace the long section with low cost and high efficiency. Multiple arrangement is provided for 3-D multi-electrode measurement, such as two-pole, three-pole and dipole.
• For 2-D multi-electrode measurement, start electrode number is designated, convenient and flexible

System buildup

　　(1) WGMD-6 distributed 3-D multi-electrode resistivity imaging system mainframe

• normal DC resistivity and IP measurement.
• 2-D multi-electrode resistivity
• 3-D multi-electrode resistivity
• measured results display, storage
• transmitter and receiver combined
• super low power cost design
• equipped with RS-232C port

　　(2) PDS-1 distributed switcher adapter, cable and stainless electrodes

• 800V super-high voltage, maximum 3A current, advanced internationally
• polyurethane coated cable designed for field survey, reliability, high performance, high anti-interference.
• PC controlled, accurate, reliable, quick
• imported reliable switcher design
• electrode number can be added by adding cable chain in distributed switcher, convenient and flexible.
• stainless spring link the stainless electrode and cable switcher box, reliable and convenient, uniquely in China.
• complete electrode check and recheck after switcher setup, prohibit illegal setup
• unlimited electrode arrangement
• PDS-1 distributed switcher adapter offer external power plug, can be power by 24V battery

　　(3) PDZ-1 distributed switcher self check

• quick diagnosis cable chain trouble, direct and convenient

　　(4) WINDOWS version software

• data receiving and format transfer
• common data editing and plot
• electrical sounding automatic interpretation
• isoline, 3-D curved surface plot
• 2-D high density forward modeling and inversion

Technical specifications:

　(1) WGMD-6 mainframe
　　Receiver

• Voltage channel：±6V
  Survey accuracy: if Vp≥10 mV then ± 5‰ ± 1 LSB, if Vp < 10 mV, then ±1% ± 1 LSB
• Current: 5A
  Survey precision: if IP≥ 10mA then ± 5‰ ± 1 LSB, if IP < 10 mA, then ±1% ± 1 LSB
• apparent resistivity measurement accuracy: ±1% ±1 LSB
• depression is more than 80dB for 50Hz industrial interference (common mode or different mode interference)
• input impedance: ≥50MΩ

　　Transmitter

• maximum supply voltage: 900V(800V for distributed multi-electrode resistivity )
• maximum supply current: 5A

　　Others

• device supply current: ≤55mA
• power: 8 D size batteries (or same specs nickel-cadmium battery)
• Working temperature: -10℃～+50℃, 95%RH
• Size: 310×210×210 mm
• weight: 6Kg

　(2) distributed switcher cable

• cable: polyurethane coated, outer diameterΦ9mm
• cable switcher box number: 10 channels/chain (ten electrode per chain)
• box interval: 1～10m (designated by user)
• box size:Φ25mm×110mm (box only),Φ25mm×170mm (including rubber head)
• maximum supply voltage: 800V
• maximum supply current: 3A
• cable insulator: between A, B supply cable or between and A/B and low voltage cable≥1000MΩ/1000V between low voltage cable≥500MΩ/500V
• Working temperature: -20℃～+70℃

　(3) PDS-1 distributed switcher adapter

• insulator：between A, B supply cable or between and A/B and low voltage cable≥1000MΩ/1000V between low voltage cable≥500MΩ/500V
• connection to mainframe: A, B, M, N connecting bar，RS-232 port
• connection with cable switcher box: 12-pin socket
• power: 18 D size batteries (or same specs nickel-cadmium battery) （can be powered by 24V external battery with voltage more than 20V）
• size: 220×130×210 mm
• weight: 2kg
• Working temperature:-10℃～+50℃