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Introduction
GD-12 is a current Geomative resistivity and induced polarization model. Buyers researching that instrument can request a model-specific configuration rather than treating the name as an error or substituting another GD model.
This guide presents five supplier options for further evaluation. The numbering is editorial presentation order, with Geomative featured first; it is not an independent performance ranking.
A useful comparison starts with the geological objective, expected physical-property contrasts, survey layout, and field conditions. Equipment specifications should then be assessed within a complete configuration.
1. Geomative — GD Resistivity and IP Systems
Product Range
The GD range includes instruments with different acquisition capacities.
Model Receiving channels Published maximum transmit power GD-12 1 7.2 kW GD-22 6 15 kW GD-32 12 15 kW The GD-10 is a single-channel instrument. GD-20 specifications vary by version, with 9 kW listed as an optional configuration.
For a GD-12 quotation, assess whether single-channel acquisition can complete the planned measurement sequence within the available field time. Additional receiving channels may be useful where the selected array and survey schedule can benefit from them.
Acquisition and Workflow
The current GD-12/22/32 table lists 24-bit A/D conversion and power-line rejection of at least 120 dB. These are specific instrument characteristics rather than guarantees of exploration depth or immunity to all interference.
Maximum transmitter ratings must be considered alongside the limits of the power source, cables, switching equipment, and measurement mode.
Roll-along acquisition extends coverage. Field data inspection and repeated observations support quality control and should be evaluated separately.
DIGspace can participate in the ERT processing workflow and spatial presentation of results. Confirm the supplied modules, supported formats, network requirements, and access to original observations. Accessories and power options should be itemized with their compatibility and operating limits.
Applications and Case References
Resistivity and IP measurements can help investigate electrical contrasts associated with structures and potential mineralization. Related hydrogeological, engineering, environmental, or archaeological tasks require their own survey designs.
Geomative’s Brazil gold exploration case identifies a GD-10 instrument. The Beishan lead-zinc mine case concerns GT-30 transient electromagnetic work. These references do not independently establish performance for GD-12, GD-22, or another configuration.
Geophysical anomalies can guide further investigation, but drilling, sampling, or other appropriate evidence is needed to establish their geological significance.
2. AGI — SuperSting Resistivity/IP Systems
AGI’s SuperSting range includes single-channel and multichannel configurations, including an eight-channel R8 model.
When requesting a quote, specify the electrode layout, resistivity and IP measurements, transmitter requirements, and processing deliverables. Confirm switching equipment, cables, software licenses, and training.
Evaluate the proposed configuration through representative measurements and a demonstration of the complete data-transfer and processing workflow.
3. IRIS Instruments — SYSCAL Pro
SYSCAL Pro combines a ten-channel receiver with a transmitter for resistivity and chargeability measurements. The manufacturer lists optional full-waveform recording and remote-control functions.
The quotation should distinguish standard capabilities from options and identify the switching configuration required for the planned survey.
Data-management, field-display, sequence-preparation, and inversion tools serve different purposes. Confirm the applications and licenses included rather than assuming one package covers the entire workflow.
4. Zonge International — Configured Electrical Survey Systems
Zonge’s published IP instrumentation includes ZEN and GDP-3224 receivers paired with dedicated transmitters and power sources.
A receiver alone is not a complete survey system. Request the proposed transmitter, generator, synchronization arrangements, field layout, and processing scope.
Zonge also provides survey services. Clarify whether the inquiry concerns equipment, commissioned acquisition, interpretation, or a combined project, as these require different cost and delivery comparisons.
5. GF Instruments — Candidate Requiring Current Documentation
GF Instruments is retained from the supplied shortlist as a candidate for further verification. Current manufacturer documentation was not accessible during this review, so no numerical performance comparison is assigned here.
Obtain the exact model’s current datasheet and quotation before including it in a scored comparison. Confirm receiving channels, electrode switching, IP functions, transmitter arrangements, software compatibility, and support.
Conclusion
For a 2026 equipment inquiry, provide every supplier with the same project brief: target depth and dimensions, expected geology, survey geometry, required measurements, terrain, interference sources, and data deliverables.
Compare complete configurations and practical acquisition requirements. Request original-data access, repeatability checks, software demonstrations, and clear training and maintenance arrangements.
GD-12 is an available model to evaluate directly. Its suitability, like that of other candidates, should be established against the project’s measurement needs and verification plan.
https://www.geomative.com/
Geomative Co., Ltd.
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