Geophysical Digital Electrical Resistivity Meter Geophysical Prospecting Equipment Underground Water Detector
Product Description
Geophysical resistivity meter can be applicable for various resistivity prospecting methods and displayed the measuring parameters directly, such as apparent resistivity (denoted Rs), the amperage and voltage.
Apparent resistivity ρs/Res: When the ground surface is flat and medium underground is uniform, infinite and isotropic medium, connect the current electrode A and B to the power source and provide a current intensity of IP to the earth, then gain the potential differences VP between Potential electrode M and N. Resistivity measured in this way is the homogeneous earth resistivity. But actually, the earth conditions dissatisfy resistivity survey: the measured results are not resistivity of the surrounding rock or the ore body, but apparent resistivity. Apparent resistivity is represented by ρs and calculated in ΩM. It can be defined as follows:
ρs=K (VP/IP)
Among them, K as the array factor (or geometric factor) is calculated by the corresponding electrode array configuration formula, according the specific electrode array configuration and distances among electrode A, B, M, N, etc.
Main features and functions of Digital Electrical Resistivity Meter Geophysical Prospecting Equipment Underground Water Detector
It integrates transmitting and receiving, light and flexible.
Perfect anti-interference technology--multi-stage filtering and signal enhancement technology, integrated electrical interference suppressor function (with super strong anti-common mode interference and differential mode interference ability), high measurement accuracy.
Automatic self-potential, drift and electrode polarization compensation.
The measurement parameters of the entire measuring line can be drawn as a curve on the large display screen, and the measurement results are intuitive and clear.
The working cycle can be set arbitrarily, there are 9 kinds of common working methods in the field, and the input and calculation functions of the pole distance constant and device constant
Pole distance constant table - For all devices, up to 100 groups of different pole distance constants can be stored in advance, so as to avoid input errors that may be caused by repeated input of the same pole distance constant. Entering only one number, the corresponding group of pole distance constants can be called up use or reset.
Large-capacity data storage - in resistivity and IP mode, it can store data of up to 2250 measuring points (in resistivity and self-electric mode, 3500 measuring points).
The fully sealed structure has the advantages of waterproof, dustproof and long life.
Technical Specifications of Digital Electrical Resistivity Meter Geophysical Prospecting Equipment Underground Water Detector
| Receiving |
| Voltage |
± 6V, precision: |
| Measurement accuracy |
if Vp≥10mV, ± 5‰ ± 1LSB;
if Vp < 10mV, ±1% ± 1LSB. |
| Input impedance |
≥50MΩ |
| Measurement precision of arrarent polarizability |
± 1 ± 1LSB |
| SP compensation range |
±1V |
| Current |
5A,±1%±1LSB |
| Measurement accuracy |
if Vp≥10mA, ± 5‰ ± 1LSB;
if Vp < 10mA, ±1% ± 1LSB. |
| Suppression |
≥80dB for 50Hz frequency industrial and electrical interference
(common mode interference or differential mode interference) |
| Transmitting |
| Max transmitting power |
4500W |
| Max voltage |
±900V |
| Max current |
±5A(when voltage ≤900v) |
| Pulse width |
1~60s, duty ratio 1:1 |
| Others |
| Working temperature |
-10ºC~50ºC, 95 %RH |
| Storage temperature |
-20ºC~+50ºC |
| Power supply |
eight D-size batteries
(or nickel-cadmium batteries of the same specs) |
| Overall current |
≤ 55mA |
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