GD-12/22/32 1/6/12-Channel DC Resistivity and IP System

The GD-12/22/32 is a next-generation DC resistivity survey system integrating ERT, IP, and SP. It supports 1D electrical sounding, 2D/3D resistivity surveys, water-based surveys, and borehole/cross-hole investigations, with built-in GPS/BeiDou time synchronization and DIGspace cloud-based data management.

Product Overview

A New Generation of the GD Series

The GD-12/22/32 retains the GD series’ iconic enclosure while delivering comprehensive hardware and software upgrades. Paired with the new DIGspace data management platform, it streamlines field acquisition and office processing.

Deep Exploration: Up to 15 kW output at 1,500 V / 10 A.
Long-Term Monitoring: Supports over 1,000 electrodes.
Mid- to Deep-Depth IP Surveys: Dual-range reception (±2.5 V / ±80 V) and 100% full-waveform acquisition for groundwater and mineral exploration.
Large-Area Reconnaissance: Multiple independent receivers, each with 12 receiving channels, for improved field efficiency.

Gallery

Technology Highlights

2D/3D Roll-Along Surveys

2D Surveys: Extend survey profiles using a limited cable layout, eliminating redundant measurement points and improving field efficiency. 3D Surveys: Combine smaller survey areas into larger 3D datasets, with automatic coordinate transformation for more complete subsurface coverage.

Expandable Electrode Capacity

Supports electrode arrays of more than 1,000 electrodes. Additional relay power supplies can be configured as needed to accommodate larger survey layouts.

High-Speed Data Acquisition

Equipped with the newly developed GS receiver, each unit supports simultaneous acquisition across 12 channels. Multiple receivers can be deployed to increase acquisition capacity. GPS-based time synchronization enables time-aligned data segmentation and cloud upload, streamlining data acquisition along the entire survey profile.

Flexible Channel Configuration

Acquisition channels can be configured individually or in groups for independent measurement. Faulty channels can be selectively disabled without interrupting normal system operation, enhancing operational flexibility and system reliability.

Dual-Range Voltage Measurement

Selectable voltage ranges of ±2.5 V and ±80 V accommodate signals of varying amplitudes. The lower range is suited to weak-signal measurements, while the higher range supports larger input signals, balancing measurement sensitivity and application flexibility.

Advanced Signal Conditioning

Built-in ±10 V hardware SP compensation helps mitigate self-potential interference, preserving weak signals for reliable measurement. Hardware automatic gain control (AGC), with a gain range of 1/8 to 128, adapts to varying input signal levels.

Flexible Sampling Rates and Power-Line Frequency Selection

Selectable sampling rates of 1 kHz, 250 Hz, 100 Hz, and 50 Hz support different data acquisition requirements. The mobile app enables one-touch switching between 50 Hz and 60 Hz power-line frequency settings to accommodate regional electrical environments.

Integrated Monitoring, Protection, and Connectivity

Supports real-time monitoring of time-series data acquisition and online inversion with automatic result visualization. The system features an IP66-rated enclosure and protection against overcurrent, overvoltage, short circuits, overheating, and lightning surges. Wi-Fi and Ethernet connectivity, together with mobile app control, simplifies field operation and data transfer.

Application Cases

Mineral Exploration

Engineering Geology

Hydrogeology

Environmental Geophysics

Online Monitoring

Cross‑hole investigation

Key Features

Supports up to 12-channel parallel acquisition, with expandable independent receivers to increase field productivity and reduce survey time.

Combines ≥120 dB power-line interference rejection, ≥100 MΩ input impedance, and ±10 V hardware SP compensation to help minimize noise and improve signal quality.

Supports 100% full-waveform acquisition and dual voltage ranges of ±2.5 V and ±80 V to capture signals across a wide range of amplitudes, supporting reliable data interpretation and inversion.

Integrated with DIGspace for real-time data upload, noise removal, and automated inversion imaging and report generation, streamlining the transition from field acquisition to data processing.

With output specifications of up to 15 kW, 1,500 V, and 10 A, combined with roll-along surveys, the system supports deep investigations and continuous acquisition along extended survey profiles.

Integrates ERT, IP, electrical sounding, water-based surveys, and online monitoring capabilities in one system configuration. Supports 24/7 online monitoring and alerts where configured.

Technical Specifications

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	0.1%+0.3μV (±2.5V)	0.1%+0.3μV (±2.5V)0.1%+9.5μV (±80V)	0.1%+0.3μV (±2.5V)0.1%+9.5μV (±80V)0.1%+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

Accessories

Cable heads, centralized switching boxes, and single- or multi-channel distributed switching boxes connect high-density cables to the main unit for electrode signal acquisition and channel switching. The units feature durable PC+ABS or aluminum-alloy housings and waterproof connectors from Amphenol. Their maintenance-free design requires no charging.

Distributed cable head

CS-60

Single-channel distributed switching box

Multi-channel distributed switching box

Ordering Information

Material Code	Model	Name	Material	Weight	Application Scenario	Acquisition Channels
M1.0001	SR-10	Dual-Direction Single-Channel Cable Head	PC+ABS housing	0.4kg	Distributed Electrode Layout	Single channel
M1.0002	SR-20	Dual-Direction Multi-Channel Cable Head	PC+ABS housing	0.4kg	Distributed Electrode Layout	5 channels
M1.0006	SR-60	Single-Channel Distributed Switching Box	Aluminum alloy housing	5kg	Land–Water Integrated Surveys & Borehole-to-Surface Surveys	Single channel
M1.0004	SR-60 plus	Multi-Channel Distributed Switching Box	Aluminum alloy housing	5kg	Land–Water Integrated Surveys & Borehole-to-Surface Surveys	5 channels
M1.0003	CS-60	Centralized Switching Box	Aluminum alloy housing	5kg	Surface Surveys, Cross-Hole Surveys, and Laboratory Research	Single channel

High-density cables are essential components of multi-electrode resistivity survey systems. Cable taps connect to individual electrodes and carry electrode signals to the switching units for acquisition. The cables feature copper conductors and a TPU jacket, providing flexibility and mechanical durability for field deployment.

The cable range includes centralized and distributed configurations. Centralized cables are available for land, surface-water, underwater, and borehole surveys, with single-tap and dual-tap options depending on the configuration.

Land cables are designed for surface electrical resistivity surveys. Cable taps connect to individual electrodes, while signals are routed through the cable to the main unit. The cables feature copper conductors and a TPU jacket, with a maximum transmit voltage of 800 V and a maximum transmit current of 2.5 A.

Available configurations support 5, 10, 15, or 30 taps, with single-tap and dual-tap designs for 2D profile and area surveys.

Configuration: 5–30 taps; 0.5–15 m spacing
Maximum Rating: 800 V / 2.5 A
Protection Rating: IP66

Ordering Information

Material Code	Model	Name	Material	Specification	Length	Maximum Transmit Voltage	Maximum Transmit Current	Number of Taps	Application	Default Spacing
M1.2004	CB10-2	Single 10-tap cable, 2m spacing	Copper core + TPU jacket	Single-tap	21m	800V	2.5A	10	Land survey	2.1m
M1.2006	CB10-5	Single 10-tap cable, 5m spacing	Copper core + TPU jacket	Single-tap	51m	800V	2.5A	10	Land survey	5.1m
M1.2007	CB10-10	Single 10-tap cable, 10m spacing	Copper core + TPU jacket	Single-tap	102m	800V	2.5A	10	Land survey	10.2m
M1.2008	CB10-15	Single 10-tap cable, 15m spacing	Copper core + TPU jacket	Single-tap	152m	800V	2.5A	10	Land survey	15.2m
X	CB10-X (custom)	Custom	Copper core + TPU jacket	Single-tap	X	800V	2.5A	10	Land survey	X
M1.2001	CE5-5	Dual 5-tap cable, 5m spacing	Copper core + TPU jacket	Dual-tap	25.5m	800V	2.5A	5	Land survey	5.1m
M1.2002	CE5-10	Dual 5-tap cable, 10m spacing	Copper core + TPU jacket	Dual-tap	51m	800V	2.5A	5	Land survey	10.2m
X	CE5-X	Custom	Copper core + TPU jacket	Dual-tap	X	800V	2.5A	5	Land survey	X
M1.2010	CB15-5	Single 15-tap cable, 5m spacing	Copper core + TPU jacket	Single-tap	76.5m	800V	2.5A	15	Land survey	5.1m
M1.2011	CB15-10	Single 15-tap cable, 10m spacing	Copper core + TPU jacket	Single-tap	153m	800V	2.5A	15	Land survey	10.2m
M1.2014	CB30-5	Single 30-tap cable, 5m spacing	Copper core + TPU jacket	Single-tap	151m	800V	2.5A	30	Land survey	5.1m
X	X	Custom	Copper core + TPU jacket	Single-tap	X	800V	2.5A	X	Land survey	X

Designed for surface-water and borehole surveys, these high-density cables feature a single-tap configuration with waterproofing and tensile-strength provisions. Available in 30- and 60-tap configurations, they support 5 m or custom tap spacing. Selected models are designed for deep borehole deployment.

Configuration: 30 or 60 taps; 5 m or custom spacing
Maximum Rating: 800 V / 2.5 A
Protection Rating: IP68

Ordering Information

Material Code	Model	Name	Material	Length	Max Transmit Voltage	Max Transmit Current	Number of Taps	Application Scenario	Tensile-resistant	Default Spacing	Tap Material
M1.2016	CF30-5	Single 30-tap freshwater cable, 5m spacing	Copper core + TPU jacket	160m	800V	2.5A	30	Freshwater survey	120kg	5m	Beryllium bronze, nickel-plated
M1.2017	CF30-5B	Single 30-tap freshwater, 5m spacing	Copper core + TPU jacket	320m	800V	2.5A	30	Freshwater survey	120kg	5m	Beryllium bronze, nickel-plated
M1.2018	CF60-5	Single 60-tap freshwater, 5m spacing	Copper core + TPU jacket	320m	800V	2.5A	60	Freshwater survey	120kg	5m	Beryllium bronze, nickel-plated
M1.2019	CD30-5	Single 30-tap borehole cable, 5m spacing	Copper core + TPU jacket	160m	800V	2.5A	30	Borehole survey	120kg	5m	Beryllium bronze, nickel-plated
M1.2020	CD30-5B	Single 30-tap borehole cable, 5m spacing	Copper core + TPU jacket	320m	800V	2.5A	30	Borehole survey	120kg	5m	Beryllium bronze, nickel-plated
M1.2021	CD60-5	Single 60-tap borehole cable, 5m spacing	Copper core + TPU jacket	320m	800V	2.5A	60	Borehole survey	120kg	5m	Beryllium bronze, nickel-plated
M1.2022	CM30-5	Single 30-tap marine cable, 5m spacing	Copper core + TPU jacket	160m	800V	2.5A	30	Marine survey	500kg	5m	Titanium/tantalum
M1.2023	CM30-5B	Single 30-tap marine cable, 5m spacing	Copper core + TPU jacket	320m	800V	2.5A	30	Marine survey	500kg	5m	Titanium/tantalum
M1.2024	CM60-5	Single 60-tap marine cable, 5m spacing	Copper core + TPU jacket	320m	800V	2.5A	60	Marine survey	500kg	5m	Titanium/tantalum
X	Custom	Custom	Copper core + TPU jacket	X	800V	2.5A	X	Custom scenario	X	X	Custom option

The HDPE cable is designed for long-term electrical monitoring and time-lapse resistivity surveys. Its HDPE outer jacket provides weather resistance for long-term outdoor deployment. Available in 250 m, 500 m, and 1,000 m lengths, the cable supports a maximum transmit voltage of 1,500 V and a maximum transmit current of 16 A.

Available Lengths: 250 m, 500 m, and 1,000 m
Maximum Rating: 1,500 V / 16 A
Protection Rating: IP66

Ordering Information

Material Code	Model	Name	Specification	Applicable	Length	Max Transmit Voltage	Max Transmit Current	Application Scenario
M1.3010	HDPE-1000	HDPE-1000 1D cable	0.15*51, diameter 2.2mm	1st/2nd-generation resistivity systems	1000m	1500V	16A	1D
M1.3011	HDPE-500	HDPE-500 1D cable	0.15*51, diameter 2.2mm	1st/2nd-generation resistivity systems	500m	1500V	16A	1D
M1.3012	HDPE-250	HDPE-250 1D cable	0.15*51, diameter 2.2mm	1st/2nd-generation resistivity systems	250m	1500V	16A	1D

Straight-through cables provide direct connections between system components without electrode taps. Available in 14-, 19-, and 30-core configurations, they are compatible with Geomative first-, second-, and third-generation resistivity systems. Copper conductors and a TPU jacket provide flexibility and durability for field use.

Core Configurations: 14, 19, or 30 cores
Available Lengths: 2 m to 700 m
Protection Rating: IP66

Ordering Information

Material Code	Model	Name	Applicable	Length	Application Scenario
M1.3001	ZTX-14	14-core straight-through cable	Device or cable-head connection	Customizable	Land-water combined & special scenarios
M1.3002	ZTX-19	19-core straight-through cable	Device or cable-head connection	Customizable	Land-water combined & special scenarios
M1.3003	ZTX-30	30-core straight-through cable	Device or cable-head connection	Customizable	Land-water combined & special scenarios

Conventional electrodes are used to inject current into the ground during high-density resistivity surveys. They connect to the survey cables through cable taps to establish an electrical field in the subsurface. Most models use corrosion-resistant 316L stainless steel and feature pointed probes for effective ground contact and low contact resistance.

Dimensions: 52 cm long × 38 mm outer diameter
Cores: 2
Protection Rating: IP68 (land, shallow water, and corrosive soil environments)

Ordering Information

Material Code	Model	Name	Material	Specification	Application Scenario
M4.3002	SE-40	Stainless steel electrode	316L stainless steel	12*400mm	Resistivity (Tx/Rx)
M4.3005	CE-40	Pure copper electrode	Brass	5*300mm	Resistivity (Tx/Rx)
M4.3006	PE-1	Plate electrode	316L stainless steel	1001005mm	Hardened cement pavement
M4.3013	GE-40	Galvanized iron electrode	Galvanized iron	12*400mm	Long-term monitoring buried type
M4.3009	GE-1	Graphite electrode	Graphite	150*15mm	Long-term monitoring buried type
M4.3011	SE-1	Disc electrode	316L stainless steel	100*10mm	Long-term monitoring buried type
M4.3001	NP-1	Non-polarizable electrode	Lead chloride	75*100mm	IP Receiving

Flexible electrodes are designed for measurements on curved surfaces and inside pipes. Connected to the survey cable via lead wires, they provide electrical contact with irregular surfaces. The conductive silicone and copper-mesh construction conforms to different shapes, while the four-core design provides redundant connections to support stable signal acquisition.

Dimensions: 30 cm × 5 cm
Cores: 4
Protection Rating: IP67

Ordering Information

Material Code	Model	Name	Specification	Application Scenario
M4.3019	FPC-1	FPC flexible electrode	Custom	Research experiment
M4.3020	SIP-1	SIP flexible electrode	Custom	Research experiment

Junction boxes provide centralized connections for multi-channel electrodes and route signals between the electrodes, cables, and main unit. Available in 10-channel and 30-channel configurations, they feature an ABS engineering-plastic housing with metal terminals and an IP65 protection rating. Optional F-type waterproof enclosures provide additional IP67 protection for field use.

Configurations: 10 or 30 channels
Protection Rating: IP65 for the junction box; IP67 with the compatible waterproof enclosure

WB-10

WB-30

Ordering Information

Material Code	Model	Name	Category	Material	Dimensions (L×W×H)	Channels/Cores	Protection Rating	Length	Rated Voltage	Rated Current	Application Scenario	Connection Method	Compatible Devices	Service Life
M1.1005	WB-10	10-channel junction box	Junction Boxes	ABS engineering plastic + metal terminals	201×168×300mm	10 channels	IP65	—	250V	3A	10-electrode access/switching	Aviation plug + terminal block	All versions	≥5 years
M1.1006	WB-30	30-channel junction box	Junction Boxes	ABS engineering plastic + metal terminals	230×150×85mm	30 channels	IP65	—	250V	3A	30-electrode access/switching	Aviation plug + terminal block	All versions	≥5 years
M3.5085	—	F-type waterproof box (for WB-10)	Junction box accessory	Engineering plastic	200×120×75mm	—	IP67	—	—	—	WB-10 protective enclosure	Latch + screws	WB-10 only	≥5 years
M3.5086	—	F-type waterproof box (for WB-30)	Junction box accessory	Engineering plastic	230×150×85mm	—	IP67	—	—	—	WB-30 protective enclosure	Latch + screws	WB-30 only	≥5 years
M3.5087	—	F-type waterproof box (for resistance box)	Junction box accessory	Engineering plastic	158×90×60mm	—	IP67	—	—	—	Resistance-box protective enclosure	Latch + screws	RB-4 only	≥5 years

The RB-4 resistance box is an auxiliary component for electrode grounding-resistance compensation in high-density resistivity systems. Its precision resistor network helps compensate for and match electrode grounding resistance to support reliable data acquisition. The unit features a metal housing and an IP65 protection rating.

Dimensions: 158 × 90 × 60 mm
Protection Rating: IP65

Ordering Information

Material Code	Model	Name	Material	Dimensions (L×W×H)	Protection Rating	Application Scenario	Connection Method	Compatible Devices
M1.1007	RB-4	Resistance box	Metal housing + precision resistor network	158×90×60mm	IP65	Electrode grounding-resistance compensation	Terminal block	All versions

The BP-150 and BP-300 are portable, rechargeable DC boost power supplies for high-density resistivity, IP, and online monitoring systems. Each unit features a built-in lithium battery and provides a maximum output voltage of 150 V or 300 V, respectively, at up to 3 A. The units can be charged from a 110–240 V AC supply and feature a GE plastic housing with an IP67 protection rating.

Output Voltage: 150 V (BP-150) or 300 V (BP-300)
Maximum Output Current: 3 A
Charging Input: 110–240 V AC
Protection Rating: IP67

BP-150

BP-300

Ordering Information

Material Code	Model	Name	Maximum Output Voltage	Maximum Output Current	Charging Input Voltage	Output Type	Operating Temperature Range	Storage Temperature Range	Weight	Dimensions (L × W × H)	Housing Material	Fuse Specification	Power Supply Type
M0.5001	BP-150	150V DC boost power supply	150V	3A	110V~240V AC	DC output	-10 ℃/+50℃	-20℃/+60℃	7.5kg	L377W299H195mm	GE plastic	5.2*20mm	Lithium battery
M0.5003	BP-300	300V DC boost power supply	300V	3A	110V~240V AC	DC output	-10 ℃/+50℃	-20℃/+60℃	8kg	L377W299H195mm	GE plastic	6A 5.2*20mm	Lithium battery

The BP-600 and BP-1000 are external-input DC boost power supplies designed for high-density resistivity and IP surveys. Unlike the battery-powered models, they do not contain an internal battery and require an external power source.

The BP-600 provides six selectable output voltage levels from 100 V to 600 V, while the BP-1000 offers adjustable output up to 1,000 V. Both models have a stated conversion efficiency above 90%.

BP-600 Output: 100 / 200 / 300 / 400 / 500 / 600 V, selectable
BP-1000 Output: 0–1,000 V, adjustable
Stated Conversion Efficiency: Greater than 90%
Protection Rating: IP65

BP-600

BP-1000

Ordering Information

Material Code	Model	Name	Input Voltage Range	Max Input Current	Efficiency	Max Output Current	Output Voltage Range	Operating Temperature	Operating Humidity	Storage Temperature	Storage Humidity
M0.5005	BP-600	600V DC boost power supply	12~48V DC	35A	>90%	0.5A	100/200/300/400/500/600V selectable	-40℃~+45℃	<95%	-50℃~+70℃	<95%
M0.5006	BP-1000	1000V DC boost power supply	220V±10% AC	-	>90%	5	0~1000V adjustable	-10℃- 50 ℃	<95%	-20℃- 60 ℃	≤95%

Layout & Wiring

1D sounding: layout can deploy 24 electrodes at once, testing 12 points synchronously. Feature 1: Segmented centralized design uses SR-10/SR-20 bidirectional smart cable heads for electrode switching in high-density surveys. Feature 2: Sections can be joined indefinitely, meeting deep-profile and 3D high-density needs. Feature 3: Dual distributed high-density cable interfaces remove the need for a transition switch controller in cross-hole surveys. Main unit: GD-12/22/32 Switching device: SR-10/20 bidirectional smart cable head Cable: 12-tap bidirectional high-density cable (CE5/CB10 series), each tap has two independent connectors controlled by the two cable heads.

Segmented centralized design uses SR-10/SR-20 bidirectional smart cable heads for electrode switching, with indefinitely joinable sections. Feature 1: Sections can be joined indefinitely, meeting deep-profile and 3D high-density needs. Feature 2: Dual distributed high-density cable interfaces remove the need for a transition switch controller in cross-hole surveys. Main unit: GD-12/22/32 Switching device: SR-10/20 bidirectional smart cable head Cable: 12-tap bidirectional high-density cable (CE5/CB10 series), each tap with two independent connectors controlled by the two cable heads.

The GD-20 main unit features an independent 12-channel design; 1D layout deploys 24 electrodes at once, testing 12 points synchronously. Feature 1: 1D layout deploys 24 electrodes, testing 12 points synchronously. Feature 2: Supports 4-level sounding, dipole-dipole, pole-dipole, mid-gradient and custom arrays. Main unit: GD-12/22/32 Switching device: Jumper box (WB-10/WB-30) Multi-core cable with non-polarizable electrodes for 1D resistivity/IP sounding.

Two connectors of the same tap are paralleled or connected to different electrodes, with BP power for high-power IP testing. Feature 1: The two connectors of one tap in parallel can carry double current. Feature 2: Connect a normal electrode and a non-polarizable electrode on the two connectors for IP measurement. Feature 3: With the BP-series high-power rectifier, high-power IP testing is possible. Main unit: GD-12/22/32 + BP-150/300/600/1000 high-power supply Switching device: SR-10/20 bidirectional smart cable head + jumper box 12-tap bidirectional high-density cable, supports parallel or high-current IP measurement.

Uses the mid-gradient method: A and B current electrodes fixed at both ends of the line, measurement electrodes distributed along it. Feature 1: Suited to large-area rapid surveying, detecting steeply dipping low-resistivity bodies. Feature 2: Multiple main units can measure synchronously, improving efficiency. Main unit: GD-12/22/32 Supreme/Advanced Switching device: SR-10/20 bidirectional smart cable head Cable: 12-tap bidirectional high-density cable.

Uses single-tap cable with a double-loop method for IP measurement: stainless-steel electrode transmits, non-polarizable electrode receives.

Feature 1: Stainless-steel electrode connected to P1 as the transmitting electrode.

Feature 2: Non-polarizable electrode used for receiving, enabling combined resistivity and IP measurement.

Main unit: GD-12/22/32 Supreme 2D+/3D+

Switching device: Jumper box + SR-10/20 cable head

Cable: Single-tap high-density cable.

Uses dual-tap cable in a single-loop layout, the two taps connecting a normal electrode and a non-polarizable electrode. Feature 1: The two taps connect a normal electrode and a non-polarizable electrode. Feature 2: Controlled by the two cable heads respectively, enabling synchronous resistivity and IP measurement. Main unit: GD-12/22/32 Switching device: SR-10/20 bidirectional smart cable head Cable: Dual-tap high-density cable (CE5 series).

Use floats to suspend waterproof cable on the water surface, with the main unit on a boat or ground, to study the sub-bottom geoelectric structure. Feature 1: Various array measurements to study the sub-bottom geoelectric structure. Feature 2: For long sections, rolling tests with GPS-assisted positioning. Main unit: GD-12/22/32 (with waterproof cable) Switching device: SR-10/20 waterproof cable head Cable: Waterproof high-density cable.

Continuous high-density measurement on water surfaces, suited to continuous profile surveys of rivers, lakes, reservoirs and other water bodies. Feature 1: Suited to continuous profile surveys of rivers, lakes, reservoirs, etc. Feature 2: Obtains sub-bottom geoelectric section information. Main unit: GD-12/22/32 (with waterproof cable) Switching device: SR-10/20 waterproof cable head Cable: Waterproof high-density cable.

Electrodes placed in the same or different boreholes, connected via multi-core cable to surface acquisition, bringing measuring points closer to the target. Feature 1: Points closer to the target give higher signal fidelity and more accurate data. Feature 2: The custom cable needs no cable-head termination, 1m spacing, using a dedicated cross-hole script. Main unit: GD-12/22/32 Switching device: Custom cable head + transition switch Cable: Borehole distributed cable (CD30 series), 1m spacing.

In the lab, set up a 1D test environment, create a 1D IP test task for instrument-operation training and teaching demos. Feature 1: Create a 1D IP test task for operation training and demos. Feature 2: Can measure current, voltage, apparent resistivity, chargeability, etc. Main unit: GD-12/22/32 Switching device: Jumper box Cable: Standard multi-core cable + stainless-steel/non-polarizable electrodes.

GD-12/22/32 1/6/12-Channel DC Resistivity and IP System

Product Overview

A New Generation of the GD Series

Deep Exploration: Up to 15 kW output at 1,500 V / 10 A.
Long-Term Monitoring: Supports over 1,000 electrodes.
Mid- to Deep-Depth IP Surveys: Dual-range reception (±2.5 V / ±80 V) and 100% full-waveform acquisition for groundwater and mineral exploration.
Large-Area Reconnaissance: Multiple independent receivers, each with 12 receiving channels, for improved field efficiency.

Gallery

Technology Highlights

2D/3D Roll-Along Surveys

Expandable Electrode Capacity

Supports electrode arrays of more than 1,000 electrodes. Additional relay power supplies can be configured as needed to accommodate larger survey layouts.

High-Speed Data Acquisition

Flexible Channel Configuration

Dual-Range Voltage Measurement

Advanced Signal Conditioning

Flexible Sampling Rates and Power-Line Frequency Selection

Integrated Monitoring, Protection, and Connectivity

Application Cases

Mineral Exploration

Engineering Geology

Hydrogeology

Environmental Geophysics

Online Monitoring

Cross‑hole investigation

Key Features

Supports up to 12-channel parallel acquisition, with expandable independent receivers to increase field productivity and reduce survey time.

Combines ≥120 dB power-line interference rejection, ≥100 MΩ input impedance, and ±10 V hardware SP compensation to help minimize noise and improve signal quality.

Supports 100% full-waveform acquisition and dual voltage ranges of ±2.5 V and ±80 V to capture signals across a wide range of amplitudes, supporting reliable data interpretation and inversion.

Integrated with DIGspace for real-time data upload, noise removal, and automated inversion imaging and report generation, streamlining the transition from field acquisition to data processing.

With output specifications of up to 15 kW, 1,500 V, and 10 A, combined with roll-along surveys, the system supports deep investigations and continuous acquisition along extended survey profiles.

Integrates ERT, IP, electrical sounding, water-based surveys, and online monitoring capabilities in one system configuration. Supports 24/7 online monitoring and alerts where configured.

Technical Specifications

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	0.1%+0.3μV (±2.5V)	0.1%+0.3μV (±2.5V)0.1%+9.5μV (±80V)	0.1%+0.3μV (±2.5V)0.1%+9.5μV (±80V)0.1%+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

Accessories

Distributed cable head

CS-60

Single-channel distributed switching box

Multi-channel distributed switching box

Ordering Information

Material Code	Model	Name	Material	Weight	Application Scenario	Acquisition Channels
M1.0001	SR-10	Dual-Direction Single-Channel Cable Head	PC+ABS housing	0.4kg	Distributed Electrode Layout	Single channel
M1.0002	SR-20	Dual-Direction Multi-Channel Cable Head	PC+ABS housing	0.4kg	Distributed Electrode Layout	5 channels
M1.0006	SR-60	Single-Channel Distributed Switching Box	Aluminum alloy housing	5kg	Land–Water Integrated Surveys & Borehole-to-Surface Surveys	Single channel
M1.0004	SR-60 plus	Multi-Channel Distributed Switching Box	Aluminum alloy housing	5kg	Land–Water Integrated Surveys & Borehole-to-Surface Surveys	5 channels
M1.0003	CS-60	Centralized Switching Box	Aluminum alloy housing	5kg	Surface Surveys, Cross-Hole Surveys, and Laboratory Research	Single channel

Available configurations support 5, 10, 15, or 30 taps, with single-tap and dual-tap designs for 2D profile and area surveys.

Configuration: 5–30 taps; 0.5–15 m spacing
Maximum Rating: 800 V / 2.5 A
Protection Rating: IP66

Ordering Information

Material Code	Model	Name	Material	Specification	Length	Maximum Transmit Voltage	Maximum Transmit Current	Number of Taps	Application	Default Spacing
M1.2004	CB10-2	Single 10-tap cable, 2m spacing	Copper core + TPU jacket	Single-tap	21m	800V	2.5A	10	Land survey	2.1m
M1.2006	CB10-5	Single 10-tap cable, 5m spacing	Copper core + TPU jacket	Single-tap	51m	800V	2.5A	10	Land survey	5.1m
M1.2007	CB10-10	Single 10-tap cable, 10m spacing	Copper core + TPU jacket	Single-tap	102m	800V	2.5A	10	Land survey	10.2m
M1.2008	CB10-15	Single 10-tap cable, 15m spacing	Copper core + TPU jacket	Single-tap	152m	800V	2.5A	10	Land survey	15.2m
X	CB10-X (custom)	Custom	Copper core + TPU jacket	Single-tap	X	800V	2.5A	10	Land survey	X
M1.2001	CE5-5	Dual 5-tap cable, 5m spacing	Copper core + TPU jacket	Dual-tap	25.5m	800V	2.5A	5	Land survey	5.1m
M1.2002	CE5-10	Dual 5-tap cable, 10m spacing	Copper core + TPU jacket	Dual-tap	51m	800V	2.5A	5	Land survey	10.2m
X	CE5-X	Custom	Copper core + TPU jacket	Dual-tap	X	800V	2.5A	5	Land survey	X
M1.2010	CB15-5	Single 15-tap cable, 5m spacing	Copper core + TPU jacket	Single-tap	76.5m	800V	2.5A	15	Land survey	5.1m
M1.2011	CB15-10	Single 15-tap cable, 10m spacing	Copper core + TPU jacket	Single-tap	153m	800V	2.5A	15	Land survey	10.2m
M1.2014	CB30-5	Single 30-tap cable, 5m spacing	Copper core + TPU jacket	Single-tap	151m	800V	2.5A	30	Land survey	5.1m
X	X	Custom	Copper core + TPU jacket	Single-tap	X	800V	2.5A	X	Land survey	X

Configuration: 30 or 60 taps; 5 m or custom spacing
Maximum Rating: 800 V / 2.5 A
Protection Rating: IP68

Ordering Information

Material Code	Model	Name	Material	Length	Max Transmit Voltage	Max Transmit Current	Number of Taps	Application Scenario	Tensile-resistant	Default Spacing	Tap Material
M1.2016	CF30-5	Single 30-tap freshwater cable, 5m spacing	Copper core + TPU jacket	160m	800V	2.5A	30	Freshwater survey	120kg	5m	Beryllium bronze, nickel-plated
M1.2017	CF30-5B	Single 30-tap freshwater, 5m spacing	Copper core + TPU jacket	320m	800V	2.5A	30	Freshwater survey	120kg	5m	Beryllium bronze, nickel-plated
M1.2018	CF60-5	Single 60-tap freshwater, 5m spacing	Copper core + TPU jacket	320m	800V	2.5A	60	Freshwater survey	120kg	5m	Beryllium bronze, nickel-plated
M1.2019	CD30-5	Single 30-tap borehole cable, 5m spacing	Copper core + TPU jacket	160m	800V	2.5A	30	Borehole survey	120kg	5m	Beryllium bronze, nickel-plated
M1.2020	CD30-5B	Single 30-tap borehole cable, 5m spacing	Copper core + TPU jacket	320m	800V	2.5A	30	Borehole survey	120kg	5m	Beryllium bronze, nickel-plated
M1.2021	CD60-5	Single 60-tap borehole cable, 5m spacing	Copper core + TPU jacket	320m	800V	2.5A	60	Borehole survey	120kg	5m	Beryllium bronze, nickel-plated
M1.2022	CM30-5	Single 30-tap marine cable, 5m spacing	Copper core + TPU jacket	160m	800V	2.5A	30	Marine survey	500kg	5m	Titanium/tantalum
M1.2023	CM30-5B	Single 30-tap marine cable, 5m spacing	Copper core + TPU jacket	320m	800V	2.5A	30	Marine survey	500kg	5m	Titanium/tantalum
M1.2024	CM60-5	Single 60-tap marine cable, 5m spacing	Copper core + TPU jacket	320m	800V	2.5A	60	Marine survey	500kg	5m	Titanium/tantalum
X	Custom	Custom	Copper core + TPU jacket	X	800V	2.5A	X	Custom scenario	X	X	Custom option

Available Lengths: 250 m, 500 m, and 1,000 m
Maximum Rating: 1,500 V / 16 A
Protection Rating: IP66

Ordering Information

Material Code	Model	Name	Specification	Applicable	Length	Max Transmit Voltage	Max Transmit Current	Application Scenario
M1.3010	HDPE-1000	HDPE-1000 1D cable	0.15*51, diameter 2.2mm	1st/2nd-generation resistivity systems	1000m	1500V	16A	1D
M1.3011	HDPE-500	HDPE-500 1D cable	0.15*51, diameter 2.2mm	1st/2nd-generation resistivity systems	500m	1500V	16A	1D
M1.3012	HDPE-250	HDPE-250 1D cable	0.15*51, diameter 2.2mm	1st/2nd-generation resistivity systems	250m	1500V	16A	1D

Core Configurations: 14, 19, or 30 cores
Available Lengths: 2 m to 700 m
Protection Rating: IP66

Ordering Information

Material Code	Model	Name	Applicable	Length	Application Scenario
M1.3001	ZTX-14	14-core straight-through cable	Device or cable-head connection	Customizable	Land-water combined & special scenarios
M1.3002	ZTX-19	19-core straight-through cable	Device or cable-head connection	Customizable	Land-water combined & special scenarios
M1.3003	ZTX-30	30-core straight-through cable	Device or cable-head connection	Customizable	Land-water combined & special scenarios

Dimensions: 52 cm long × 38 mm outer diameter
Cores: 2
Protection Rating: IP68 (land, shallow water, and corrosive soil environments)

Ordering Information

Material Code	Model	Name	Material	Specification	Application Scenario
M4.3002	SE-40	Stainless steel electrode	316L stainless steel	12*400mm	Resistivity (Tx/Rx)
M4.3005	CE-40	Pure copper electrode	Brass	5*300mm	Resistivity (Tx/Rx)
M4.3006	PE-1	Plate electrode	316L stainless steel	1001005mm	Hardened cement pavement
M4.3013	GE-40	Galvanized iron electrode	Galvanized iron	12*400mm	Long-term monitoring buried type
M4.3009	GE-1	Graphite electrode	Graphite	150*15mm	Long-term monitoring buried type
M4.3011	SE-1	Disc electrode	316L stainless steel	100*10mm	Long-term monitoring buried type
M4.3001	NP-1	Non-polarizable electrode	Lead chloride	75*100mm	IP Receiving

Dimensions: 30 cm × 5 cm
Cores: 4
Protection Rating: IP67

Ordering Information

Material Code	Model	Name	Specification	Application Scenario
M4.3019	FPC-1	FPC flexible electrode	Custom	Research experiment
M4.3020	SIP-1	SIP flexible electrode	Custom	Research experiment

Configurations: 10 or 30 channels
Protection Rating: IP65 for the junction box; IP67 with the compatible waterproof enclosure

WB-10

WB-30

Ordering Information

Material Code	Model	Name	Category	Material	Dimensions (L×W×H)	Channels/Cores	Protection Rating	Length	Rated Voltage	Rated Current	Application Scenario	Connection Method	Compatible Devices	Service Life
M1.1005	WB-10	10-channel junction box	Junction Boxes	ABS engineering plastic + metal terminals	201×168×300mm	10 channels	IP65	—	250V	3A	10-electrode access/switching	Aviation plug + terminal block	All versions	≥5 years
M1.1006	WB-30	30-channel junction box	Junction Boxes	ABS engineering plastic + metal terminals	230×150×85mm	30 channels	IP65	—	250V	3A	30-electrode access/switching	Aviation plug + terminal block	All versions	≥5 years
M3.5085	—	F-type waterproof box (for WB-10)	Junction box accessory	Engineering plastic	200×120×75mm	—	IP67	—	—	—	WB-10 protective enclosure	Latch + screws	WB-10 only	≥5 years
M3.5086	—	F-type waterproof box (for WB-30)	Junction box accessory	Engineering plastic	230×150×85mm	—	IP67	—	—	—	WB-30 protective enclosure	Latch + screws	WB-30 only	≥5 years
M3.5087	—	F-type waterproof box (for resistance box)	Junction box accessory	Engineering plastic	158×90×60mm	—	IP67	—	—	—	Resistance-box protective enclosure	Latch + screws	RB-4 only	≥5 years

Dimensions: 158 × 90 × 60 mm
Protection Rating: IP65

Ordering Information

Material Code	Model	Name	Material	Dimensions (L×W×H)	Protection Rating	Application Scenario	Connection Method	Compatible Devices
M1.1007	RB-4	Resistance box	Metal housing + precision resistor network	158×90×60mm	IP65	Electrode grounding-resistance compensation	Terminal block	All versions

Output Voltage: 150 V (BP-150) or 300 V (BP-300)
Maximum Output Current: 3 A
Charging Input: 110–240 V AC
Protection Rating: IP67

BP-150

BP-300

Ordering Information

Material Code	Model	Name	Maximum Output Voltage	Maximum Output Current	Charging Input Voltage	Output Type	Operating Temperature Range	Storage Temperature Range	Weight	Dimensions (L × W × H)	Housing Material	Fuse Specification	Power Supply Type
M0.5001	BP-150	150V DC boost power supply	150V	3A	110V~240V AC	DC output	-10 ℃/+50℃	-20℃/+60℃	7.5kg	L377W299H195mm	GE plastic	5.2*20mm	Lithium battery
M0.5003	BP-300	300V DC boost power supply	300V	3A	110V~240V AC	DC output	-10 ℃/+50℃	-20℃/+60℃	8kg	L377W299H195mm	GE plastic	6A 5.2*20mm	Lithium battery

The BP-600 provides six selectable output voltage levels from 100 V to 600 V, while the BP-1000 offers adjustable output up to 1,000 V. Both models have a stated conversion efficiency above 90%.

BP-600 Output: 100 / 200 / 300 / 400 / 500 / 600 V, selectable
BP-1000 Output: 0–1,000 V, adjustable
Stated Conversion Efficiency: Greater than 90%
Protection Rating: IP65

BP-600

BP-1000

Ordering Information

Material Code	Model	Name	Input Voltage Range	Max Input Current	Efficiency	Max Output Current	Output Voltage Range	Operating Temperature	Operating Humidity	Storage Temperature	Storage Humidity
M0.5005	BP-600	600V DC boost power supply	12~48V DC	35A	>90%	0.5A	100/200/300/400/500/600V selectable	-40℃~+45℃	<95%	-50℃~+70℃	<95%
M0.5006	BP-1000	1000V DC boost power supply	220V±10% AC	-	>90%	5	0~1000V adjustable	-10℃- 50 ℃	<95%	-20℃- 60 ℃	≤95%

Layout & Wiring

Uses single-tap cable with a double-loop method for IP measurement: stainless-steel electrode transmits, non-polarizable electrode receives.

Feature 1: Stainless-steel electrode connected to P1 as the transmitting electrode.

Feature 2: Non-polarizable electrode used for receiving, enabling combined resistivity and IP measurement.

Main unit: GD-12/22/32 Supreme 2D+/3D+

Switching device: Jumper box + SR-10/20 cable head

Cable: Single-tap high-density cable.