Table of Contents

Product Introduction

This Ground Resistance & Soil Resistivity Tester is elaborately developed for on-site measurement of ground resistance, soil resistivity and ground voltage. Adopting digital and microprocessor technology, it measures ground resistance via precise 4-wire, 3-wire and simple 2-wire methods. Equipped with FFT (Fast Fourier Transform) and AFC (Automatic Frequency Control) technologies, it automatically identifies interference and selects measuring frequencies to minimize interference impact and deliver highly accurate readings.

Boasting outstanding anti-interference capability and great environmental adaptability, it features excellent repeatability, ensuring long-term measurement with high precision, stability and reliability. It is widely used to test grounding parameters for power systems, telecommunications, meteorology, construction projects, lightning protection facilities and industrial electrical equipment.

The complete set consists of the main unit, data upload software, test leads, auxiliary ground rods and communication cables. The main unit is fitted with a large backlit white LCD screen and bar graph indicators for intuitive reading. It can store up to 300 groups of measurement data. With supporting software, users can conduct historical data inquiry, real-time online monitoring, dynamic display and alarm prompt; it also supports data retrieval, storage, report generation and printing functions.

Alternative names: Precision Ground Resistance Tester, 4-Wire Ground Resistance Tester, 2/3/4-Wire Ground Resistance Tester, Soil Resistivity Tester, etc.

Technical Specifications

Reference & Operating Conditions

Influencing Factor	Reference Condition	Operating Condition	Remarks
Ambient Temperature	23℃±1℃	-10℃ ~ 40℃	—
Ambient Humidity	40% ~ 60% RH	＜80% RH	—
Operating Voltage of Meter	9V±0.1V	9V±1.5V	—
Auxiliary Ground Resistance	＜100Ω	＜30kΩ	rC、rP
Interference Voltage	None	＜20V	—
Interference Current	None	＜2A	—
Electrode Spacing for Ground Resistance Test	a＞5d	a＞5d	—
Electrode Spacing for Soil Resistivity Test	a＞20h	a＞20h	—

General Specifications

Item	Parameter
Functions	2/3/4-wire ground resistance measurement, soil resistivity measurement; ground voltage testing
Power Supply	DC 9V, 2# alkaline batteries (LR14 1.5V × 6)
Measuring Ranges	Ground Resistance: 0.00Ω ~ 30.00kΩ Soil Resistivity: 0.00Ω·m ~ 9000kΩ·m Ground Voltage: 0V ~ 600V
Measuring Mode	Precision 4-wire & 3-wire method, simple 2-wire method for ground resistance
Measuring Principle	Ground Resistance: Constant current variable voltage method, max. measuring current 20mA Soil Resistivity: Four-point (Wenner) method Ground Voltage: Mean value rectification (between P(S) and ES terminals)
Test Frequencies	128Hz/111Hz/105Hz/94Hz (AFC automatic frequency control)
Test Current	＞20mA (sine wave)
Open-circuit Test Voltage	Max. AC 40V
Test Voltage Waveform	Sine wave
Adjustable Electrode Spacing	1m ~ 100m
Range Switching	Ground Resistance: Fully auto ranging 0.00Ω ~ 30.00kΩ Soil Resistivity: Fully auto ranging 0.00Ω·m ~ 9000kΩ·m
Backlight	Controllable white backlight, suitable for dark environments
Display Mode	4-digit large LCD with white backlight
Measurement Indication	Flashing LED during measurement, LCD countdown & progress bar display
LCD Dimensions	128mm×75mm; Viewing area: 124mm×67mm
Overall Instrument Size	212mm×175mm×85mm
Standard Test Leads	4 pcs: 20m red, 20m black, 10m yellow, 10m green
Simplified Test Leads	2 pcs: 1.6m red, 1.6m black
Auxiliary Ground Rods	4 pcs, Φ9mm × 230mm
Measuring Speed	Ground Voltage: approx. 3 times/second Ground Resistance & Soil Resistivity: approx. 15 seconds/time
Service Life	Over 5000 measurements (short-circuit test: 1 test every 30 seconds)
Rated Line Voltage	Measurement below AC 600V
Communication Interface	USB port; supporting PC monitoring, data upload, storage & printing
USB Cable	1 piece, length: 1.5m
Data Storage Capacity	300 groups; “FULL” symbol displayed when memory full
Data Hold	“HOLD” symbol for frozen readings
Data Recall	“READ” symbol displayed during data query
Over-range Indication	“OL” symbol shown when exceeding measuring range
Interference Detection	Automatically detect noise; “NOISE” symbol triggers when interference voltage＞5V
Auxiliary Ground Resistance Test	Built-in function, range: 0.00kΩ~30kΩ
Alarm Function	Beeping alert when measured value exceeds preset threshold
Low Battery Prompt	Low battery icon pops up when voltage drops to ~7.5V
Operating Current	Standby: ~20mA (backlight off) Power-on with backlight: ~45mA (25mA without backlight) Measuring state: ~100mA (backlight off)
Weight	Instrument only: approx. 1330g Total weight (with package): approx. 4.5kg
Operating Temperature & Humidity	-10℃ ~ 40℃, RH＜80%
Storage Temperature & Humidity	-20℃ ~ 60℃, RH＜70%
Overload Protection	AC 280V/3s between terminals for ground resistance measurement
Insulation Resistance	≥20MΩ (500V applied between circuit and housing)
Withstand Voltage	AC 3700V rms (between circuit and housing)
EMC Performance	Complies with IEC 61326
Safety Standards	IEC 61010-1 (CAT III 300V, CAT IV 150V); IEC 61010-031; IEC 61557-1/-5; JJG 366-2004

FAQ: Ground Resistance Tester

1. What main parameters can this tester measure?

It can test ground resistance, soil resistivity and ground voltage. It supports 2-wire, 3-wire and 4-wire testing methods to meet various field grounding detection demands.

2. What anti-interference technologies does the instrument adopt?

It applies FFT and AFC automatic frequency control technologies. It automatically identifies on-site electromagnetic interference and selects optimal frequency to minimize noise for precise readings.

3. What is the measuring range of the device?

Ground resistance: 0.00Ω~30.00kΩ; Soil resistivity: 0.00Ω·m~9000kΩ·m; Ground voltage: 0~600V, covering most power and lightning protection projects.

4. Is the tester suitable for outdoor harsh working environments?

Yes. Operating temperature ranges from -10℃ to 40℃ with humidity below 80%RH, featuring strong environmental adaptability for substations, construction sites and field towers.

5. Can I store test data and export it to a computer?

It stores up to 300 groups of data. Equipped with a USB port, users can upload records to PC for checking, saving, report generation and printing via supporting software.

6. What accessories are standardly equipped together with the main unit?

Comes with 4 standard long test leads, 2 short simplified leads, 4 auxiliary ground rods, a USB communication cable and detailed operation manual.

7. Does it have automatic ranging and backlight function?

It adopts fully automatic range switching for all measurement ranges. Controllable white LCD backlight is available for easy reading in dark environments such as basements and cable trenches.

8. What alarm and prompt functions does it have?

It includes over-limit beeping alarm, low battery reminder, over-range OL display, NOISE interference prompt, HOLD data freeze and READ data query indicators.

9. What power supply does this instrument use?

Powered by six 1.5V No.2 alkaline batteries (total DC 9V). It features low power consumption and can complete more than 5000 measurement cycles continuously.

10. Which industries and scenarios is it widely used in?

Ideal for power systems, telecommunications base stations, meteorological stations, building lightning protection, industrial equipment and earthing grid safety inspection work.

11. Does the product comply with international safety standards?

It meets IEC 61010, IEC 61557 and IEC 61326 EMC standards, with reliable insulation resistance and withstand voltage performance for safe high-voltage field testing.

12. What is the total weight and dimension for portable transportation?

Main body size: 212×175×85mm; instrument weight: 1330g; total packed weight is about 4.5kg, easy to carry for outdoor field commissioning.

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