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2D 3D Multi Channel Geophysics Survey Instrument Geophysical Resistivity Meter
How to interpret 2D 3D Geophysical Electrical Resistivity Meter Survey Data?
Under suitable method,mutil-electrode 2D 3D Geophysical Electrical Resistivity Meter is the apparent electrical resistivity imaging . High-resistance area represents compact rock mass with good integrity and low water content; Low-resistance zone represents water-bearing, loose broken or fractured water-bearing zone of rock mass. Karst cavities show high resistance area, and karst caves filled with clay and water show low resistance area. Most karst caves and karst fracture zones are partially filled, the upper part is hollow, the lower part is loose filled, the upper part is high resistance, and the lower part is low resistance, forming intermittent beaded combined abnormal areas.
To sum up, the karst interpretation and determination of electrical resistivity images follow the following three principles:
① the upper part of the karst zone is a cavity, and the lower part is a filling, showing a beaded anomaly of intermittent combination of high resistance and low resistance;
② Karst is developed in limestone, and the background resistivity value has high resistivity characteristics;
③ Karst is developed along the structural fracture zone, and the trend and occurrence of beaded anomaly are consistent with the regional structure.
The resistivity anomaly image conforming to the above three principles is interpreted as karst. Some karst is completely filled, and there is no overhead cave, especially the karst buried below the groundwater level, which is completely filled with loose matter and water, showing strong low resistance characteristics.
Please see as following details about our geophysical electrical resistivity meter:
Technical specification
Receiving part
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Voltage channel:
| ±6V |
Measurement accuracy:
| Vp≥10mV时,±0.5% ±1 character Vp< 10mV时,±1% ±1 character |
Input resistance:
| > 50 MΩ |
Apparent polarizability measurement accuracy:
| ±1% ±1character |
Sp compensation range:
| ±1V . |
Current channel:
| 5A |
Measurement accuracy:
| Ip≥ 10mA时,±0.5% ±1character Ip< 10mA时,±1% ±1character |
The suppression of 50Hz power frequency interference (common mode interference and differential mode interference) is better than 80dB
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Launch part
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Maximum transmit power:
| 4500W |
Maximum supply voltage:
| ±900V |
Maximum supply current:
| ±5A |
Power supply pulse width:
| 1~60 seconds, the duty ratio is 1:1
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| Other | |
Operating temperature:
| -10°C~ +50°C, 95%RH |
Storage temperature:
| -20°C~ +60°C |
Instrument power supply:
| No. 1 battery (or nickel-cadmium battery of the same specification) 8 pieces
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Current current:
| ≤55mA |
| Weight: | ≤7KG |
Volume:
| 310mm*210mm*210mm |
WDZJ-3 multi-channel electrode converter
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Converting the number of electrodes:
| 60 road
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Insulation properties:
| ≥500 MΩ |
Maximum working voltage:
| 450 VDC |
Maximum operating current:
| 2.5 ADC |
Instrument power supply:
| No. 1 battery (or nickel-cadmium battery with the same specification) 8 pieces
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Operating temperature:
| -10°C~ +50°C |
Certificate
