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GDCR3100C Digital Earth Resistance Tester

GDCR3100C Digital Earth Resistance Tester

GDCR3100C Digital Intelligent Earth Resistance and Soil Resistivity Tester with 2/3/4-Wire Measurement, FFT Anti-Interference, Built-in Lithium Battery, for Small & Medium Grounding System Evaluation.

Description
Specifications
Applications
Advantages
FAQ
Recommended Products

Description

GDCR3100C is a professional portable digital earth resistance tester designed for comprehensive testing of small and medium grounding systems in distribution rooms, lightning protection systems, communication base stations, industrial equipment and buildings. It strictly complies with GB/T 17949.1-2000, IEC 61557-5:2019 and DL/T 475-2017 standards, supporting 2-wire simple, 3-wire standard and 4-wire precision measurement methods to meet different test requirements.

Adopting advanced FFT (Fast Fourier Transform) and AFC (Automatic Frequency Control) technologies, the instrument automatically identifies and suppresses power frequency interference, ensuring accurate measurement results even in complex electromagnetic environments. It supports comprehensive test functions including earth resistance, soil resistivity (Wenner four-pole method), earth voltage and AC voltage measurement. The built-in 7.4V/2600mAh high-capacity lithium battery provides ≥8 hours continuous working time, eliminating the need for external AC power supply.

Specifications

Parameter	Specification
Compliance Standards	GB/T 17949.1-2000, IEC 61557-5:2019, DL/T 475-2017, IEEE Std 80-2013
Test Methods	2-wire simple, 3-wire standard, 4-wire precision
Test Frequencies	128Hz/111Hz/105Hz/9Hz (AFC automatic selection)
Output Current	AC 20mA maximum
Open-Circuit Voltage	AC 40V maximum
Earth Resistance Range	0.00Ω ~ 30.00kΩ (automatic range switching)
Resistance Resolution	0.01Ω (0.00~99.99Ω); 0.1Ω (100.0~999.9Ω); 1Ω (1.000~30.00kΩ)
Resistance Accuracy	±(2% of reading + 3 digits)
Soil Resistivity Range	0.00Ω·m ~ 9000kΩ·m
Resistivity Resolution	0.01Ω·m (0.00~99.99Ω·m); 0.1Ω·m (100.0~999.9Ω·m); 1Ω·m (1.000~9.999kΩ·m); 10Ω·m (10.00~99.99kΩ·m); 100Ω·m (100.0~999.9kΩ·m); 1kΩ·m (1000~9000kΩ·m)
Earth Voltage Range	AC 0.0V ~ 600V
Voltage Resolution	0.1V
Voltage Accuracy	±(2% of reading + 3 digits)
Electrode Spacing	1m ~ 100m adjustable
Power Supply	Built-in 7.4V/2600mAh lithium battery; USB charging
Battery Life	≥8 hours continuous working, ≥500 tests per charge
Charging Time	≤4 hours
Display	Large backlit LCD, white backlight
Data Storage	300 groups (with time stamp and test parameters)
Communication Interfaces	USB 2.0, Bluetooth 4.0
Protection Grade	IP65 (waterproof and dustproof)
Operating Temperature	-10℃ ~ +50℃
Humidity	≤90% RH (non-condensing)
Dimensions (L×W×H)	210×120×65mm
Weight	~1.8kg (including battery)
Enclosure	ABS+PC engineering plastic with rubber protective cover

Applications

Core Test Objects

Distribution systems: Distribution rooms, pole-mounted transformers, low-voltage distribution cabinets
Lightning protection systems: Lightning rods, lightning belts, grounding grids for buildings
Communication systems: Communication base stations, signal towers, data centers
Industrial equipment: Motors, generators, electrical control cabinets
Other grounding systems: Household grounding, solar power systems, wind turbines

Typical Usage Scenarios

Power companies: Distribution network routine inspection, lightning protection system test
Telecom operators: Communication base station grounding system maintenance
Construction industry: Building lightning protection acceptance test
Industrial enterprises: Internal electrical equipment grounding inspection
Third-party testing institutions: Lightning protection certification testing, safety assessment

Advantages

Compliance with Latest International Standards

Fully meets GB/T 17949.1-2000, IEC 61557-5:2019, IEEE Std 80-2013 → test results are globally recognized

Industry-Leading FFT+AFC Anti-Interference

Automatically identifies and suppresses power frequency interference → accurate measurement even in complex electromagnetic environments

2/3/4-Wire Universal Measurement

Supports all common measurement methods → one instrument meets all small and medium grounding system test requirements

Automatic Soil Resistivity Calculation

One-click calculation of soil resistivity using Wenner four-pole method → eliminates manual calculation errors and improves test efficiency

Long Battery Life & Comprehensive Communication

≥8 hours battery life, USB/Bluetooth dual interface → meets the needs of all-day on-site work and facilitates data management

IP65 Industrial-Grade Protection

Waterproof, dustproof and shockproof design → works reliably in harsh outdoor environments

FAQ

Q: What is the advantage of 4-wire measurement compared to 2-wire and 3-wire?

A: 4-wire measurement separates current injection and voltage sensing leads, completely eliminating the influence of test lead resistance and contact resistance, providing the most accurate measurement results. It is recommended for precision testing of low-resistance grounding systems. 2-wire and 3-wire methods are suitable for simple and quick testing where high accuracy is not required.

Q: How does the FFT+AFC anti-interference technology work?

A: AFC (Automatic Frequency Control) automatically selects a test frequency that is different from the power frequency (50Hz/60Hz) to avoid direct interference. FFT (Fast Fourier Transform) then digitally filters the measured signal to further suppress residual interference. This dual technology ensures accurate measurement results even in environments with strong power frequency interference.