GD-20 Multi-channel ERT/IP Imaging System

The GD-20 multi-channel electrical system offers 5/12 channels and supports multiple electrical survey methods, improving test efficiency by 2-3x; the device is lightweight with built-in storage, and the conversion box supports multi-array acquisition modes.

Product Overview

Functions

Performs Spontaneous Potential (SP), 1D resistivity/IP sounding, and 2D/3D high-density resistivity/IP imaging; supports multi-channel independent synchronous acquisition for surface, water-surface continuous, underwater static and borehole/cross-hole high-density surveys.

Measurement Parameters

Transmit power: Senior 7200W (1200V×6A), Advanced 2D/Supreme 2D/Supreme 2D+ 3200W (800V×4A); voltage measurement range ≥±24V; voltage accuracy 0.1%; current accuracy ≤0.1%; input impedance ≥200MΩ; SP compensation ±10V; A/D conversion 24-bit; iterations 1~255; channels 5/12.

Product Catalog

Product & Accessories

Product Front

Main Unit Side

Ordering Information

GD-20 Senior

GD-20 Advanced 2D

GD-20 Supreme 2D

GD-20 Supreme 2D+

In-depth Look

Multi-dimensional Data Display

To help field engineers monitor observation-data quality at any time, GD-series main units provide rich data-browsing tools, including a measuring-point data list (with data details), pseudo-section, profile, and transmit/receive signal waveforms.

Unique Multi-channel Measurement Scheme

Supports multi-channel data measurement, greatly improving efficiency; up to 12 channels run simultaneously, suited to water-surface towed continuous measurement, and supports multiple arrays measuring at once.

2D/3D Rolling

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.

Rich and Varied Connection Methods

Diverse layout and connection methods meet different terrain and customer needs, ensuring data authenticity and accuracy to the greatest extent.

Meticulous Electrode Setup & Verification

Supports equal-spacing electrode skipping, so a small-spacing cable can complete large-electrode-spacing tests. If rock or gullies make it impossible to place an electrode in the field, the tap at that position can be left vacant without affecting the whole section. The system provides a detailed grounding-resistance test data list to intuitively locate poorly grounded electrodes. After grounding improvement, that electrode can be re-tested individually, or a whole cable re-tested, avoiding repeated full re-tests — saving field battery power and improving efficiency.

Rich Programmable Scripts & Data Processing

Based on the concept of programmable, customizable testing, Geomative Studio provides a scripting method so users can pre-plan survey areas and trim measuring points. The system supports scripts trimmed from standard arrays, as well as fully user-defined scripts imported from external Excel files. To reduce interference between consecutive measuring points, scripts support three point-test orders: by layer, by rolling surface, and random offset. After acquisition, Geomative Studio manages the main-unit data and supports exporting txt, excel, dat, urf and other formats for convenient processing. A terrain file can also be added to the exported data for inversion.

Powered by DIGspace

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

Application Cases

Mineral Resource Exploration

Online Monitoring

Cross‑hole investigation

Hydrogeological Survey

Engineering Geology Investigation

Subsurface Environmental Monitoring

Key Selling Points

Supports up to 12-point synchronous measurement; ERT efficiency is 2-3x that of single-channel, greatly shortening field schedules and meeting water-surface towed continuous measurement needs.

Combines the reliability of centralized layout with the advantages of distributed wiring, making long-profile and complex-terrain surveys more convenient.

Max transmit 1500V/6A (9000W); high-density mode 1000V/2.5A — deep penetration and stable data.

24-bit AD, power-line rejection ≥120dB, voltage accuracy 0.3%, stable SP compensation — suited to leakage detection and fine exploration.

Supports 2D high-density, 1D sounding, 3D imaging and cross-hole / borehole-surface / water-surface surveys — one device, many uses.

The main unit weighs only 8.5kg, with a bright outdoor screen and an aluminum-alloy body — durable in the field and easy to carry.

Scheduled acquisition, 4G upload, cloud inversion and unattended operation — suited to reservoir-dam, slope and tailings-pond monitoring.

The base model upgrades smoothly to 2D/3D/IP/3D functions — configure as needed at controllable cost.

Technical Specifications

Parameter	GD-20 Senior	GD-20 Advanced 2D	GD-20 Supreme 2D	GD-20 Supreme 2D+
Max Transmit Power	7200W (standard)/9000W (optional)	3200W/9000W (optional)	3200W/9000W (optional)	3200W/9000W (optional)
Max Transmit Voltage	1200V (standard)/1500V (optional)	800V (standard)/1500V (optional)	800V (standard)/1500V (optional)	800V (standard)/1500V (optional)
Max Transmit Current	6A	4A	4A	4A
IP Period	1s/2s/4s/8s/16s/32s/64s selectable	1s/2s/4s/8s/16s/32s/64s selectable	1s/2s/4s/8s/16s/32s/64s selectable	1s/2s/4s/8s/16s/32s/64s selectable
Output Waveform	Square wave	Square wave	Square wave	Square wave
Voltage Measurement Range	≥±24V	≥±24V	≥±24V	≥±24V
Voltage Accuracy	0.1%±1μV	0.1%±1μV	0.1%±1μV	0.1%±1μV
SP Compensation	±10V (auto)	±10V (auto)	±10V (auto)	±10V (auto)
A/D Conversion Bits	24 bit	24 bit	24 bit	24 bit
Iterations	1~255	1~255	1~255	1~255
Storage	≥16GB (32GB optional)	≥16GB (32GB optional)	≥16GB (32GB optional)	≥16GB (32GB optional)
Built-in Battery	16.8V built-in lithium battery	16.8V built-in lithium battery	16.8V built-in lithium battery	16.8V built-in lithium battery
Charging Voltage	120~250V (50/60Hz)	120~250V (50/60Hz)	120~250V (50/60Hz)	120~250V (50/60Hz)
External Power	DC 24V~60V	DC 24V~60V	DC 24V~60V	DC 24V~60V
Operating Temperature	-20℃~+60℃	-20℃~+60℃	-20℃~+60℃	-20℃~+60℃
Storage Temperature	-20℃~+70℃	-20℃~+70℃	-20℃~+70℃	-20℃~+70℃
Dimensions	39×20×29cm	39×20×29cm	39×20×29cm	39×20×29cm
Weight	8kg	8kg	8kg	8kg
Display	5.7-inch color LCD, 640×480	5.7-inch color LCD, 640×480	5.7-inch color LCD, 640×480	5.7-inch color LCD, 640×480
Interfaces	A/B/M/N/∞, ERI test port, USB, RS485, charger, external power	A/B/M/N/∞, ERI test port, USB, RS485, charger, external power	A/B/M/N/∞, ERI test port, USB, RS485, charger, external power	A/B/M/N/∞, ERI test port, USB, RS485, charger, external power
Channels	12	5/12 (5-channel or 12-channel optional)	5/12 (5-channel or 12-channel optional)	5/12 (5-channel or 12-channel optional)
Spontaneous Potential (SP)	√	√	√	√
1D Resistivity	√	√	√	√
1D IP	√	√	√	√
2D Resistivity	—	√	√	√
2D IP	—	—	—	√
3D Resistivity	—	—	√	√
3D IP	—	—	—	√

Accessories

The cable head is the connection unit between the high-density cable and the main unit, used to acquire and switch electrode signals. Its PC and ABS housing is rugged and durable; the Amphenol waterproof plug is convenient and reliable; maintenance-free, with no charging required.
- Spec: 215mm long, 50mm outer diameter
- Protection rating: IP67

Ordering Information

Material Code	Model	Name	Material	Weight	Application Scenarios	Acquisition Channels
M1.0002	SR-20	Bidirectional multi-channel cable head	PC+ABS housing	0.45kg	Distributed layout	Multi-channel
M1.0003	SR-60 plus	Multi-channel distributed switching box	Aluminum alloy housing	5kg	Land-water combined & borehole-surface combined	Multi-channel

High-density cables are core accessories for high-density electrical surveys. Multiple taps connect to electrodes and transmit subsurface electric-field signals to the cable head for acquisition and switching. Copper-core + TPU jacket is flexible and tensile-resistant, suited to complex field deployment; max transmit voltage 800V, max transmit current 2A, compatible with the entire 1st-to-3rd-generation resistivity product line. The cable family is divided into centralized and distributed by structure; centralized is further split by scenario into land, water-surface and underwater/borehole; each sub-class is split into single-tap and dual-tap by tap type.

The land high-density cable is the standard signal cable for land electrical surveys. It connects to electrodes through taps, and all tap signals are carried along a single cable to the main unit. Copper core + TPU jacket, flexible and tensile-resistant, max transmit voltage 800V, max transmit current 2.5A; tap spacing from 0.5m to 20m and 5/10/15/30/60-tap versions, split into single-tap and dual-tap types, suited to land electrical profiling and areal measurement. Single-tap cables use one tap per position, each connected to an electrode through an independent channel — simple in structure, easy to maintain, and the mainstream configuration for high-density surveys.

- Spec: 10~30 taps, 0.5~20m spacing, max 800V/2.5A

- Protection rating: IP66

Ordering Information

Material Code	Model	Name	Material	Specification	Length	Max Transmit Voltage	Max Transmit Current	Number of Taps	Application Scenario	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	2m
M1.2006	CB10-5	Single 10-tap cable, 5m spacing	Copper core + TPU jacket	Single-tap	51m	800V	2.5A	10	Land survey	5m
M1.2007	CB10-10	Single 10-tap cable, 10m spacing	Copper core + TPU jacket	Single-tap	102m	800V	2.5A	10	Land survey	10m
M1.2008	CB10-15	Single 10-tap cable, 15m spacing	Copper core + TPU jacket	Single-tap	152m	800V	2.5A	10	Land survey	15m
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	5m
M1.2002	CE5-10	Dual 5-tap cable, 10m spacing	Copper core + TPU jacket	Dual-tap	51m	800V	2.5A	5	Land survey	10m
X	CE5-X (custom)	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	2m
M1.2011	CB15-10	Single 15-tap cable, 5m spacing	Copper core + TPU jacket	Single-tap	153m	800V	2.5A	15	Land survey	5m
M1.2014	CB30-5	Single 15-tap cable, 5m spacing	Copper core + TPU jacket	Single-tap	151m	800V	2.5A	30	Land survey	10m
X	CE15/30-X (custom)	Custom	Copper core + TPU jacket	Single-tap	X	800V	2.5A	15/30	Land survey	X

The overwater / borehole high-density cable is a dedicated signal cable for freshwater and marine electrical surveys, using a single-tap structure with a waterproof, tensile-resistant design to support both freshwater and marine working environments. Copper core + TPU jacket + beryllium-bronze nickel-plated taps, waterproof and tensile-resistant, max transmit voltage 800V, max transmit current 2.5A; 30/60-tap versions with 5m/10m spacing, suited to water-area electrical profiling and areal measurement. Single-tap cables use one tap per position, each connected to an electrode through an independent channel — simple in structure, easy to maintain, and the mainstream configuration for high-density surveys.

- Spec: 30/60 taps, 5m/10m spacing, max 800V/2.5A

- Protection rating: IP68

Ordering Information

Material Code	Model	Name	Material	Specification	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	Single-tap	160m	800V	2.5A	30	Freshwater survey	120kg	5m	Beryllium bronze, nickel-plated
M1.2017	CF30-5B	Single 30-tap freshwater cable, 5m spacing	Copper core + TPU jacket	Single-tap	320m	800V	2.5A	30	Freshwater survey	120kg	5m	Beryllium bronze, nickel-plated
M1.2018	CF60-5	Single 60-tap freshwater cable, 5m spacing	Copper core + TPU jacket	Single-tap	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	Single-tap	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	Single-tap	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	Single-tap	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	Single-tap	160m	800V	2.5A	30	Marine survey	500kg	5m	Tantalum-plated titanium
M1.2023	CM30-5B	Single 30-tap marine cable, 5m spacing	Copper core + TPU jacket	Single-tap	320m	800V	2.5A	30	Marine survey	500kg	5m	Tantalum-plated titanium
M1.2024	CM60-5	Single 60-tap marine cable, 5m spacing	Copper core + TPU jacket	Single-tap	320m	800V	2.5A	60	Marine survey	500kg	5m	Tantalum-plated titanium
X	X	Custom	Copper core + TPU jacket	Single-tap	X	800V	2.5A	X	Custom scenario	X	X	X

Standard cables are connection and transmission lines for high-density and general electrical surveys, with no tap structure, mainly used for direct device-to-device signal links, remote AB-electrode transmission and online monitoring. Copper core + TPU jacket is flexible and tensile-resistant, max transmit voltage 800V, max current 2A, compatible with the entire 1st-to-3rd-generation resistivity product line. Standard cables are subdivided by use into AB cable, HDPE 1D cable (online monitoring), 1D cable and straight-through cable.

The HDPE 1D cable is a dedicated signal line for long-term online electrical monitoring. Its HDPE (high-density polyethylene) jacket is weather-resistant and anti-aging, suited to long-term fixed field deployment. Copper core + TPU jacket, max transmit voltage 1500V, max current 16A; length 250m/500m/1000m selectable, suited to long-term online monitoring and time-lapse surveys.

- Spec: 250m/500m/1000m, max 1500V/16A

- Protection rating: IP66

Ordering Information

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

Straight-through cables are connection lines for direct device-to-device signal links in high-density systems, with no tap structure, offered in 14/19/30-core specs for equipment used in various special scenarios. Copper core + TPU jacket. Standard 2m up to 700m long-distance transmission, clear structure and easy wiring.

- Spec: 3~32 cores, 2m~700m

- Protection rating: IP66

Ordering Information

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

Conventional electrodes are the transmitting-electrode accessory for high-density surveys, connected to the cable through taps to inject current into the ground and build an artificial electric field. The 316L stainless-steel housing is rugged and corrosion-resistant, handling corrosive soils and shallow water; the sharp probe drives into the soil with low contact impedance and resists oxidation and deformation; maintenance-free for stable, reliable long-term field work.

- Spec: 52cm long, 38mm outer diameter

- Cores: 2

- Protection rating: IP68 (land / shallow water / corrosive soil)

Ordering Information

Material Code	Model	Name	Material	Specification	Application Scenario
M4.3002	SE-40	Stainless steel electrode	316L stainless steel	12*400MM	Resistivity - (transmit, receive)
M4.3005	CE-40	Pure copper electrode	Brass	5*300MM	Resistivity - (transmit, receive)
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 adhesive electrode accessories for complex-curve and pipe-interior scenarios, connected to cables via welded leads to transmit irregular-surface electric-field signals to the acquisition system. A conductive-silicone + copper-mesh structure bends freely to fit any shape; a 4-core redundant design improves acquisition stability; IP67 suits humid and shallow-water environments; maintenance-free for stable long-term field use.

- Spec: 30cm long, 5cm wide

- Cores: 4

- Protection rating: IP67 (complex curves/pipe interiors)

Ordering Information

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

Junction boxes are core units for centralized multi-channel electrode access and signal switching in high-density systems, supporting 10/30-channel electrode access and enabling signal distribution between main unit and cables. ABS engineering-plastic housing with metal terminals, IP65; the matching F-type waterproof box adds IP67 protection for harsh field environments. Junction boxes fit the 1st-to-3rd-generation GD-10/GD-20 resistivity product line — clear structure, easy wiring, reliable protection.

- Spec: 10/30 channels, 201×168×300mm

- Protection rating: IP65 (junction box)

WB-10

WB-30

Ordering Information

Material Code	Model	Name	Material	Dimensions (L×W×H)	Protection Rating	Rated Voltage	Rated Current	Application Scenario	Connection Method	Compatible Devices
M1.1005	WB-10	10-channel junction box	ABS engineering plastic + metal terminals	201×168×300mm	IP65	250V	3A	10-electrode access/switching	Aviation plug + terminal block	All versions
M1.1006	WB-30	30-channel junction box	ABS engineering plastic + metal terminals	230×150×85mm	IP65	250V	3A	30-electrode access/switching	Aviation plug + terminal block	All versions

The resistance box is an auxiliary unit for electrode grounding-resistance compensation in high-density systems; a precision resistor network compensates and matches electrode grounding resistance, improving acquisition quality. Metal housing + precision resistor network, 4-channel design, IP65. The resistance box fits all versions — clear structure, easy wiring, reliable protection.

- Spec: 4 channels, 158×90×60mm

- Protection Rating: IP65

RB-4

Ordering Information

Material Code	Model	Name	Material	Dimensions (L×W×H)	Protection Rating	Rated Voltage	Rated Current	Application Scenario	Connection Method	Compatible Devices
M1.1005	WB-10	10-channel junction box	ABS engineering plastic + metal terminals	201×168×300mm	IP65	250V	3A	10-electrode access/switching	Aviation plug + terminal block	All versions
M1.1006	WB-30	30-channel junction box	ABS engineering plastic + metal terminals	230×150×85mm	IP65	250V	3A	30-electrode access/switching	Aviation plug + terminal block	All versions

The Battery (lithium) is a portable rechargeable power supply for high-density, IP and online-monitoring systems, with a built-in large-capacity lithium battery supporting 150V/300V DC output. Charged from 110V~240V AC, GE-plastic housing, IP67; BP-150 outputs 150V/3A, BP-300 outputs 300V/3A, weighing only 7.5~8kg — portable and easy to use for short-to-medium field campaigns.

- Spec: 150V/300V, 3A output, GE plastic housing

- Protection Rating: IP67

BP-150

BP-300

BP-300 connected to main unit

Ordering Information

Material Code	Model	Name	Max Output Voltage	Max Output Current	Charging Voltage	Output Mode	Operating Temperature	Storage Temperature	Weight	Dimensions	Housing Material	Fuse Specification	Category
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 Booster (boost power supply) is a DC step-up unit for high-density surveys with no built-in battery, taking external 12~48V DC or 220V AC input to produce DC step-up output. BP-600 offers six selectable ranges 100/200/300/400/500/600V at >90% efficiency and works down to -40℃; BP-1000 gives 0~1000V adjustable output, suited to high-power IP surveys.

- Spec: 600V six-range selectable / 1000V adjustable, efficiency >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-10/20, Advance/Supreme 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-10/20, Advance/Supreme 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-20 Supreme/Advanced 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-10/20 + 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-10/20 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-10/20 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-10/20 Supreme 2D+/3D+ 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-10/20 (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-10/20 (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-10/20 Supreme/Advanced 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-10/20 Switching device: Jumper box Cable: Standard multi-core cable + stainless-steel/non-polarizable electrodes.