MAE X624EM VHR Multichannel Georesistivimeter 48-72-96 Channels

◆ Its exceptional versatility makes it the perfect solution for resistivity and induced polarization surveys, with a wide range of applications such as groundwater exploration, mineral prospecting, geological mapping, geotechnical investigations, and archaeological research. The capability for parallel measurements, combined with an all-in-one design featuring an onboard CPU and the integration of advanced algorithms with powerful hardware, allows the X624EM to deliver precise measurements in record time.

This instrument stands out for its remarkable versatility and the ability to execute 2D and 3D surveys at high speed, thanks to its innovative data acquisition platform. The X624EM offers real-time pseudosection visualization, enabling operators to instantly verify the recorded data. It can automatically perform single measurements or user-defined measurement cycles. Data can be recorded on internal Disk on Module memory, external USB storage, or saved directly to the cloud. The system is managed through the new ETNET software, which includes a host of new features.

Modern 2D and 3D geoelectrical tomography techniques require twice as many measurements as traditional methods.
Unlike previous instruments, which typically feature only a few dozen measurement channels, the X624EM can simultaneously measure potential between any two connected electrodes (excluding the pair used for current input). In a typical configuration with N electrodes, the instrument provides N-2 acquisition channels. For example, with 48 electrodes and 46 independent channels, you can perform up to 1,035 measurements simultaneously with just one current input!

◆ Advantages of the X624EM Architecture:
Multichannel Parallel Strategy:
The X624EM's multi-channel strategy marks a significant breakthrough in electrical data acquisition, especially for 3D configurations. This advanced approach dramatically increases measurement speed, allowing you to obtain accurate and detailed results quickly, reducing hours of fieldwork and lowering operating costs. The multi-channel strategy enhances sequence design efficiency, automatically handling tasks like identifying quadrupoles or key lines, which previously required manual input. Parallel measurements generate vast amounts of data without extending acquisition times, providing more information without compromising speed.

◆ Sequencer:
The management software offers extensive options for designing measurement sequences, including electrode configuration, spacing, and 3D geometry, with a preview of the designed sequence. The Sequencer provides several key benefits that streamline the geoelectric measurement design process:

    Field Versatility: Our innovative sequence design allows for quick, on-the-spot configurations without external devices, simplifying the setup process and adapting sequences to your specific survey needs.
    Real-Time Visualization: The software provides instant previews of the sequence configuration and estimated investigation depth, optimizing sequence design for the best results.
    Efficiency: Onboard sequence design saves time, eliminating the need to return to the lab for complex configurations. Preview sequences, make adjustments on-site, and start measurements promptly.

◆ Methodology:
The ETNET suite offers various measurement methodologies, allowing you to fully customize your geoelectrical data acquisition process:

◆ Flexibility: Choose from different methodologies, including spontaneous potentials, resistivity, and induced polarization, tailoring your survey to the terrain and objectives for the most relevant data.
Customization: Control every measurement parameter, from iterations to current and voltage settings, to optimize your survey for different soil conditions.
Accuracy and Control: The ability to select and customize methodologies gives you precise control over your geoelectric survey, improving data quality and enabling more informed decisions.

◆ Windows Induced Polarization:
The software supports advanced features for induced polarization, allowing you to define time windows with sample intervals starting at 10ms. Key points include:

Custom Measurement Windows: Choose windows from 10ms to capture subtle details in terrain responses, adapting the process according to survey objectives.
Wide Range of Options: Depending on the instrument, select up to 20 measurement windows (with the ET300) or unlimited windows (with the X624EM), offering extensive flexibility.
Full IP Functionality: Obtain a complete discharge curve for induced polarization, capturing every detail over time for more precise analysis.

◆ 2D Pseudosection:
The software provides live visualization modes for acquired data, allowing customization and display of 2D pseudosections for resistivity and induced polarization. Features include:

Real-Time Visualization: Instantly view acquired data, providing immediate insights into terrain characteristics.
Detailed Information: Simultaneous display of resistivity and chargeability offers a comprehensive view of soil properties, aiding in identifying geological structures or anomalies.
Customization: Adjust visualization parameters, such as chart types and color scales, to highlight specific data ranges for detailed analysis.

◆ 3D Pseudosection:
The 3D pseudosection feature allows intuitive insertion of electrode geometry, enabling three-dimensional visualization of acquired data:

3D Visualization: Explore the subsurface with an immersive 3D representation, enhancing the analysis of geological structures.
Geometry Customization: Input electrode geometry and view 3D measurement points in real-time, facilitating immediate feedback on data acquisition.
Parameter Selection: Customize display parameters to fit specific needs, ensuring clear and detailed data representation.

◆ Quality Control:

MAE tools provide complete remote control, maximizing operational efficiency and saving time:

Tablet/Smartphone Control: Manage instruments directly from your smartphone or tablet, adjusting settings, starting captures, or monitoring status from anywhere.
Remote Monitoring: Track survey progress from home or office, design surveys remotely, and initiate acquisitions without leaving your workspace.
Cloud Data Management: Easily archive and retrieve data via the MAE cloud service, ensuring secure access to your data from anywhere.

With the X624EM, geoelectric surveys reach new levels of efficiency, accuracy, and control, ensuring the success of your projects with cutting-edge technology.

General:
ADC technology: 24bit Delta-Sigma ADC

Number of electrodes: 48-72-96 (up to 96 channels)

Array configuration: 1D, 2D, 3D e time-lapse

Measurements: Self potential, Resistivity, Induced Polarization

Dimensions: 49x39x23 cm

Weight: 18kg

Display: 10" touch screen

GPS: Yes

Export compatibility: RESinv, ERTlab, ZondRES, MAE

Roll-along function: Software controlled

Real-time pseudosection: 1D, 2D and 3D

Sequence generator: 1D, 2D and 3D

Case: IP67

Enviromental condition: -20°C / 90°C

Power supply: External 12V battery, suggested 100Ah


Output:
Power output: 600W

Voltage output: ±50V, ±100V, ±200V, ±400V, ±800V

Output current: up to 12A at 50V, up to 0.750A at 800V

Energization diagram: Custom from 250ms

Precision: ±0.2 μA

Accuracy: < 0.2 %


Input:
Measurements strategy: Parallel

Input voltage: ±25V

Precision: 1.5 μV vs fullscale

Accuracy: < 0.2 %

Input impedance: 2.5MΩ

Stacking and noise reduction: Up to 255

Input notch filter: 50Hz

Self potential adjustment: Automatic

IP's windows: 100Hz sampling

Multi-electrode Geoelectrical Prospecting+

This survey method calculates ground resistivity based on voltage difference (d.d.p.) measurements. The process involves introducing an electric field into the ground using current electrodes and measuring the d.d.p. at separate measurement electrodes. Using Ohm's second law, the resistivity value is determined, reflecting the intrinsic properties of the material. Since rocks are naturally resistive, variations in resistivity are primarily due to the presence of water in varying amounts.

In 2D-3D electrical tomography, electrode grids (16, 32, 64, 128, etc.) are fixed into the ground at regular intervals. These electrodes are connected to commutation boxes that automatically select the measuring and current electrodes, performing all possible combinations. The system generates numerous measurements based on the number of electrodes and the geometric configuration used. The tomographic inversion of this data produces a 2D or 3D reconstruction of the ground, allowing the identification of anomalies such as cavities, water bodies, and their shapes, sizes, and spatial distribution.

V.E.S. Vertical Electrical Survey+

This survey method aims to reconstruct a 1D electro-tomography at a specific measurement point. It involves the geo-electric technique, which experimentally determines the resistivity distribution that defines the electrical structure of a medium. In the SEV method, the distance between electrodes is gradually increased while measuring the ratio between voltage difference (d.d.p.) and current intensity. The resistivity values obtained are influenced by the properties of materials at greater depths, necessitating geometric corrections. This involves introducing factors dependent on the distances between the measurement electrodes (MN) and the input electrodes (AB). Depending on electrode positioning within the geo-electric field, different quadrupole systems, such as Wenner and Schlumberger, are used. The result is a 1D profile of ground resistivity at a specific location.

Induced Polarization Measurement+

Induced Polarization (IP) is an electrical phenomenon that occurs within material media. In the time domain, it is observed as chargeability, which happens when stress is released after the interruption of a step-type electric current. In the frequency domain, it involves the dispersion of electrical resistivity as the frequency of an alternating current changes. IP sources are primarily linked to redox processes at the interfaces between metal grains and interstitial fluids (electrode polarization). Another significant IP source is the accumulation of ions in moving electrolytes due to variations in mobility along the path (electro-kinetic polarization).

Through tomographic inversion of surface data, the resulting images reflect chargeability, enabling the identification of areas with potential hydrocarbon accumulations or other significant concentrations. Chargeability is directly proportional to the amount of charge stored by the lithotype, indicating the concentration of conductive materials in the multi-electrode area.

Spontaneous Potential Measurement+

The Spontaneous Potential (SP) method involves measuring potential differences on the surface that are associated with natural electric fields, which are linked to the underground flow of aqueous electrolytic solutions in porous media. By analyzing SP anomalies on the surface, the intensity and position of ionic charge concentrations of both polarities can be determined.

The test involves placing two electrodes: one near the measurement station and the other moved along subsequent stations on the line. Alternatively, both electrodes can be moved while maintaining a consistent interval between them, mapping the ground based on spontaneous potential variations. This method is particularly useful in mining for locating sulfides and graphite, as well as in archaeology. Underground water flows can be influenced by archaeological structures, which may act as drains or obstacles. By identifying SP anomalies, it is possible to indirectly detect these underground structures.