ELECTRA

ELECTRA is a digital system for electrical resistivity and induced polarization surveys.‎ A series of features make it a unique product in the landscape of georesistivity meters.‎ Acquisition times are drastically reduced thanks to simultaneous data collection across all channels of the line and the use of alternating current.‎ Weight, dimensions, and power consumption are significantly lower compared to traditional systems.‎ Data quality is improved due to digitalization occurring directly at the electrodes and dedicated techniques aimed at increasing the signal-to-noise ratio.‎ ELECTRA is a multi-channel digital resistivity meter composed of a central unit and an extremely lightweight cable, along which digitization modules are positioned and connected to the electrodes.‎ Each module can either inject current or receive the signal, which is then transmitted digitally to the central unit.‎ The digital transmission prevents cross-talk and signal degradation along the cables, ensuring high-quality data even with minimal injected currents.‎ ELECTRA can inject any type of current into the ground at various frequencies.‎ Alternating current measurements are faster and more precise since they do not require signal stabilization time and minimize induced polarization effects on the electrodes.‎ Water exploration, cavity detection, mineral prospecting, environmental issues, foundation inspections, archaeological research, or the assessment of wall structures and coatings are just some of the fields where large- and small-scale electrical surveys can be essential.‎ ELECTRA allows for subsurface and anthropogenic artifact investigations with an exceptional ease of use.‎ With ELECTRA, traditional methods such as Wenner, Schlumberger, dipole-dipole, pole-dipole, spontaneous potentials, induced polarization (and others) can be performed fully automatically.‎ TECHNICAL FEATURES POWER SUPPLY: Internal battery, included in the central unit 12 V, rechargeable.‎ A/D CONVERSION: Synchronous on all energization and measurement modules.‎ NUMBER OF CHANNELS: 24, 36, 48, 64, 72 (5-meter spacing).‎ CENTRAL UNIT DIMENSIONS: 24 x 20 x 8 cm, weight 2.‎3 kg.‎ WAVEFORM: D/A converter from DC to AC with continuous current and voltage control (feedback).‎ CURRENT: ±200 mA; typical operating values ±10 mA.‎ ADJUSTABLE FREQUENCIES: 1-32 Hz.‎ OUTPUT: Selectable on 4 ports or cable.‎ OUTPUT VOLTAGE: Automatic adjustment up to 400 V p.‎p.‎ MEASUREMENT MODULES DIMENSIONS: 5 x 6 x 2 cm.‎ INPUT: Automatically switchable between 4 different functions (positive and negative stimulation, reference, input).‎ INPUT IMPEDANCE: 100 MΩ on 6 V dynamic range; 100 kΩ on 12 V dynamic range.‎ SAMPLING: Synchronous on all modules at 256-512 Hz.‎ TRANSMISSION: Continuous and real-time transmission of conversion data to the central module and PC.‎ Further info from manufacturer on ELECTRA NOVATEST