The GD-12/22/32 is a new starting point of the GD series; its enclosure retains the most classic design. The unit has been comprehensively upgraded internally (hardware and software), enabling the all-new GD-series device to handle various high-density scenarios with ease, and together with the newly released DIGspace data-management platform, makes field surveys and office processing calm and effortless. For deep large-depth sounding, it supports a maximum 15 kW high power at 1500V/10A. For long-term safety monitoring, it supports connecting more than 1000 electrodes. For mid-deep IP prospecting for water and minerals, it supports ±2.5 V / ±80 V dual-range reception and 100% full-waveform acquisition, leaving even weak signals nowhere to hide. For large-area reconnaissance, it supports configuring multiple independent receivers, each with 12 separate receiving channels, multiplying field efficiency.
1) Resource exploration: groundwater exploration, geothermal exploration, energy-resource exploration, metallic and non-metallic mineral exploration.
2) Engineering geological survey: urban engineering detection, cave detection, slope-hazard detection, pile-foundation and ground-base detection.
3) Environmental monitoring: subsurface contaminant-change detection, seawater-intrusion detection, dam seepage detection, underground-tank leakage detection, landfill leakage detection.
4) Others: geological mapping, archaeological research, water-surface and underwater resistivity detection, borehole-surface detection, cross-hole detection, combined land-water detection.
| GD-12 | GD-22 | GD-32 |
2D rolling: a limited cable covers a longer section with no repeated measuring points, improving field efficiency. 3D rolling: small areas are combined into a large area with automatic coordinate conversion, yielding more complete sections.
>1000 channels: add relay power supplies as appropriate for the scenario to expand to a larger number of electrodes.
Equipped with the newly developed GS receiver; each receiver acquires 12 data sets simultaneously, and multiple units can be stacked. Data is sliced and synced to the cloud by GPS time segment, so the whole profile is collected efficiently once transmitter switching is done.
Acquisition channels support custom configuration; a single or multiple channels can be assigned for independent measurement. If a channel fails, it can be masked individually without affecting normal operation — strong fault tolerance.
Multiple voltage-measurement ranges can be freely switched. The low-voltage range precisely captures weak signals and improves SNR, while the high-voltage range suits high-amplitude signals — balancing accuracy and applicability, with ±2.5V and ±80V available.
Equipped with ±10V hardware SP compensation to effectively avoid spontaneous-potential interference and prevent weak valid signals from being masked; features hardware auto-gain with a 1/8~128 range, adapting to inputs of different strengths.
Offers selectable sampling rates of 1kHz, 250Hz, 100Hz and 50Hz; high rates enable refined data acquisition. Supports one-tap 50Hz/60Hz power-line mode switching via the APP to suit different regional grids.
Supports real-time monitoring of time-series acquisition and online inversion with automatic mapping. The unit reaches IP66 protection with over-current, over-voltage, short-circuit, high-temperature and lightning protection for harsh field use; supports WiFi and Ethernet dual-mode data transfer with a mobile APP for easy operation.
Raw-data processing capabilities: Waveform viewing; recalculation with automatic bad-point removal 2D-to-1D conversion Array merging Online inversion
Platform capabilities: Project and data management Real-time 3D display Online inversion
Up to 12 channels acquire in parallel and independent receivers can be added, multiplying field productivity and shortening project schedules.
≥120 dB power-line rejection, ≥100 MΩ input impedance and ±10 V hardware SP compensation keep noise down at the source.
100% full-waveform acquisition with ±2.5 V and ±80 V dual ranges keeps both strong near-field and weak far-field signals, making inversion more reliable.
Combined with DIGspace real-time upload, noise removal and automatic inversion images and reports, field work becomes office work.
15 kW / 1500 V / 10 A with roll-along measurement gives clearer deep anomalies and lets long profiles advance continuously after a single layout.
ERT/IP/sounding/marine/online monitoring handled by one system, plus 24/7 online alerts — less equipment, lower budget.
| Parameter | GD-12 | GD-22 | GD-32 |
|---|---|---|---|
| Max Transmit Voltage | 1200V | 1500V | 1500V |
| Transmit Voltage Sampling Resolution | 0.2V | 0.2V | 0.2V |
| Max Transmit Power | 7.2KW | 15KW | 15KW |
| Max Transmit Current | 6A | 10A | 10A |
| Current Measurement Accuracy | 0.001 | 0.001 | 0.001 |
| Current Max Sampling Resolution | 10nA | 10nA | 10nA |
| Pulse Waveform | Standard square wave | Standard square wave | Standard square wave |
| Pulse Width | 0.5s, 1s, 2s, 4s, 8s, 16s, 32s, 64s | 0.25s, 0.5s, 1s, 2s, 4s, 8s, 16s, 32s, 64s, 128s, 256s | 0.25s, 0.5s, 1s, 2s, 4s, 8s, 16s, 32s, 64s, 128s, 256s |
| Receive Channels | 1 channel | 6 channels | 12 channels |
| Max Supported Electrodes | >1000 | >1000 | >1000 |
| Voltage Measurement Range | ±2.5V | ±2.5V, ±80V | ±2.5V, ±80V, ±600V (custom-made) |
| Voltage Measurement Accuracy | 0.2%+0.3μV (±2.5V) | 0.2%+0.3μV (±2.5V) 0.2%+9.5μV (±80V) | 0.2%+0.3μV (±2.5V) 0.2%+9.5μV (±80V) 0.2%+70μV (±600V) |
| Voltage Max Sampling Resolution | 2nV | 2nV | 2nV |
| SP Compensation Range | ±10V | ±10V | ±10V |
| Dynamic Range | 140dB | 140dB | 140dB |
| Filtering Characteristics | 10Hz attenuation -0.6dB; 50/60Hz attenuation -110dB; 256Hz attenuation -120dB; 512Hz attenuation -160dB | 10Hz attenuation -0.6dB; 50/60Hz attenuation -110dB; 256Hz attenuation -120dB; 512Hz attenuation -160dB | 10Hz attenuation -0.6dB; 50/60Hz attenuation -110dB; 256Hz attenuation -120dB; 512Hz attenuation -160dB |
| Gain Range | 1/8~128, auto gain | 1/8~128, auto gain | 1/8~128, auto gain |
| Linearity | 0.00001 | 0.00001 | 0.00001 |
| Power-line Rejection | 50Hz/60Hz software selectable, ≥120dB | 50Hz/60Hz software selectable, ≥120dB | 50Hz/60Hz software selectable, ≥120dB |
| Sampling Rate | 50Hz, 100Hz, 250Hz selectable | 50Hz, 100Hz, 250Hz, 1kHz selectable | 50Hz, 100Hz, 250Hz, 1kHz, 33kHz selectable |
| Input Impedance | ≥100MΩ | ≥100MΩ | ≥100MΩ |
| A/D Conversion Bits | 24bit | 24bit | 24bit |
| IP Measurement Waveform | Supports 50% duty cycle IP measurement | Supports 100% and 50% duty cycle IP measurement | Supports 100% and 50% duty cycle IP measurement |
| IP Windows | Decay-curve sampling reaches up to 20 time windows | Decay-curve sampling reaches up to 20 time windows | Decay-curve sampling reaches up to 20 time windows |
| Iterations | 1-255 | 1-255 | 1-255 |
| Full-waveform Acquisition | No | Yes | Yes |
