Multi-electrode resistivity method is special action in the fine exploration.
According to the needs of users, multi-electrode resistivity measurement system by taking the WDJD-4 mutil-function digital DC induced polarization resistivity instrument as the control part, WDZJ-4 as multiplex electrode converter.
The instrument can be widely applied in metal and nonmetal mineral resources detection, city geophysical exploration, railway and bridge exploration, and other application. It is also applied in hydrologic geology and engineering geology such as searching for ground water, locate base of dam and flood protection levee incipient fault, can still used for geothermal prospecting.
|WDJD-4 Res/IP Meter|
|Voltage||± 6 V,±1 % ± 1LSB|
|Measurement accuracy||if Vp≥10mV, ± 5‰ ± 1LSB; if Vp < 10mV, ±1% ± 1LSB;|
|if Vp≥10mV, ± 5‰ ± 1LSB; if Vp < 10mV, ±1% ± 1LSB|
|Measurement precision of apparent polarizability||± 1%± 1LSB|
|SP compensation range||± 10V|
|Current||6 A,±1% ± 1 LSB|
|Measurement accuracy||if IP≥10mA, ± 5‰± 1LSB; if IP<10mA,± 1%± 1LSB|
|Suppression||over 90Db for 50Hz industrial frequency (common mode interference or differential mode interference)|
|Maximum transmitting power||±6600W|
|Maximum current||±56A (when voltage ≤900V)|
|Pulse width||1~60s, duty cycle is 1:1|
|Working temperature||-10°C~+50°C (Environmental), 95 %RH|
|Storage temperature||-20°C~+50°C (Environmental)|
|Power supply||internal 12V 9Ah rechargeable battery , lasts for 30 hours (or 12V external power supply)|
|Max electrode connected||60 and 120 (for option)|
|Max working voltage||500VDC|
|Max working current||2.5ADC|
|Power supply||Internal 7.4V 4AH rechargeable lithium battery, last for continuously 25 hours work|
1. Electrode Array configuration: referring to electrical method survey, various electrode array configurations are optional, applicable for various geologic structures. An electrode array configuration represents that its electrodes are arranged in certain mode and move at a certain method. Generally, electric profiling and electric sounding are commonly used electrode array configurations.
2. Electric profiling: electric profiling is one category of electrical methods, including many electrode array configurations whose electrodes are featured by keeping a certain distance between each electrode, while all the electrodes roll along at the same time along the survey line to measure apparent resistivity. Since that distance between electrodes keeps unchanged during roll-along movement, output current is injected underground to a certain depth, measuring depth of the points on the survey line keeping the same; in other words, the resistivity curve is geologic reflection of a certain layer.
3.Vertical electric sounding: similar to electric profiling on variety, electric sounding includes many electrode array configurations. These electrode array configurations feature keeping measuring point position fixed but increasing distances among the electrodes.