Table of Contents

Product Introduction

Model HF-GT-205 Digital Equipotential Bonding Tester, also known as Milliohm Meter or DC Earth Resistance Tester, adopts microprocessor technology and four-wire measurement method to deliver high precision and reliable safety performance.

It is a dedicated instrument for testing the bonding quality between metallic components including equipment casings, lightning arresters, ground beams, building structures, cabinet frames, steel bars, water pipes, windows, guardrails, radiators and assembly line frames. It can also measure the resistance between electrical equipment and grounding grids, transformer DC resistance, as well as contact resistance of switches and socket contacts. Widely applied in power systems, meteorology, computer rooms, oil fields, power distribution networks, railway transmission lines, gas stations, factory grounding grids and lightning protection projects. Additionally, it features DC and AC voltage measurement functions.

The complete set consists of main unit, monitoring software, test leads and communication cable. Equipped with a large LCD screen for intuitive readings, it can store up to 500 groups of measurement data. Resistance measuring range: 0.0001Ω ~ 30kΩ; DC voltage range: 0 ~ 1000V; AC voltage range: 0 ~ 750V. The supporting monitoring software enables real-time monitoring, historical data inquiry, curve display, threshold setting, audible alarm, as well as data retrieval, storage, report generation and printing.

Technical Specifications

Item	Parameter Details
Functions	Equipotential bonding resistance test between metal parts, low resistance test, conductor resistance test between grounding grid electrodes, contact resistance test, etc.
DC Resistance Range	0.0001Ω ~ 30.00kΩ, Accuracy: ±1%rdg ±5dgt
Resistance Resolution	0.0001 Ω
Measurement Method	Four-wire testing
Test Current	≥1 A
Open-circuit Voltage	≤7 V
Measuring Power	≤15 W
DC Voltage Range	0.0V ~ 1000V DC, Accuracy: ±1.5%rdg ±5dgt
DC Voltage Resolution	0.1 V
AC Voltage Range	0.0V ~ 750V AC, Accuracy: ±1.5%rdg ±3dgt
AC Voltage Resolution	0.1 V
Power Supply	DC 6V 4.5Ah rechargeable lithium battery; Continuous working time ≥ 100 hours
Backlight	Adjustable grayscale backlight, suitable for dim environments
Display Mode	4-digit large LCD screen with grayscale backlight
Measurement Indication	LED flashing during measurement, countdown display on LCD
LCD Size	108mm × 65mm
Overall Dimensions	277.2mm × 227.5mm × 153mm
Test Leads	2 red 5m leads, 2 black 5m leads
Measuring Time	Resistance test: approx. 3 seconds/time; Voltage test: approx. 2 seconds/time
USB Interface	Available for software monitoring, data upload, storage and printing
Communication Cable	1 USB communication cable
Data Storage	500 groups; marked “MEM” for storage, “FULL” for full memory
Data Query	Historical data query function with “MR” symbol prompt
Overrange Display	“OL” symbol for over-limit indication
Alarm Function	Audible alarm triggers when readings exceed preset threshold
Battery Monitoring	Real-time battery level display; low battery reminder for timely charging
Auto Power-off	Automatically shuts down after around 15 minutes of inactivity
Power Consumption	Standby: Max 30mA (backlight off) Power-on with backlight: Max 43mA Measuring state: Max 2A (backlight off)
Weight	Main unit: 2397g (with battery) Test leads: 850g (including portable lead bag) Instrument case: 1200g
Operating Temperature & Humidity	-10℃ ~ 40℃, relative humidity ≤ 80%RH
Storage Temperature & Humidity	-20℃ ~ 60℃, relative humidity ≤ 70%RH
Overload Protection	Terminals C1-C2, P1-P2 withstand AC 280V for 3 seconds
Insulation Resistance	≥10MΩ (between circuit and enclosure at 500V)
Withstand Voltage	AC 3700V rms (between internal circuit and enclosure)
Electromagnetic Compatibility	Complies with IEC61010-4-3, radiated radio frequency field ≤1V/m
Compliance Standards	IEC61010-1, CAT III 600V, Pollution Degree 2; JJG724-1991 Verification Regulation for Digital DC Ohmmeter; JJG166-1993 Verification Regulation for DC Resistance Meter; DL/T967-2007 Verification Regulation for Loop Resistance Tester & DC Resistance Rapid Tester

Packing List

Item No.	Description	Qty	Unit	Remarks
1	Main Unit of Digital Equipotential Bonding Tester	1	Set	Built-in rechargeable battery
2	Red Test Leads (5m)	2	Piece	For resistance & voltage testing
3	Black Test Leads (5m)	2	Piece
4	USB Communication Cable	1	Piece	For data transmission & firmware upgrade
5	Power Charger	1	Piece	Matched 6V charging adapter
6	Portable Instrument Carrying Case	1	Pcs	Shockproof storage box
7	User Operation Manual (English + Chinese)	1	Copy	Detailed operation & parameter introduction
8	Factory Calibration Certificate	1	Copy	Traceable calibration report
9	Supporting PC Monitoring Software CD	1	Piece	For data recording, curve display & report printing
10	Accessory Storage Bag for Test Wires	1	Pcs	For organizing test leads

FAQ for Digital Equipotential Bonding Tester

1. What is a digital equipotential bonding tester mainly used for?

It adopts four-wire testing method to measure low bonding resistance between metal components, check grounding continuity, and test DC/AC voltage. Widely used in power stations, computer rooms, lightning protection projects and industrial workshops to eliminate potential voltage hazards.

2. Why adopt the four-wire measurement technology?

Four-wire testing effectively excludes the resistance interference of test leads and contact points, ensuring ultra-high accuracy when measuring micro-resistance, which cannot be achieved by ordinary two-wire multimeters.

3. What resistance range can this instrument measure?

Measuring range: 0.0001Ω ~ 30.00kΩ, suitable for equipotential bonding resistance, grounding connection resistance, contact resistance and transformer DC resistance testing.

4. Can it measure DC and AC voltage simultaneously?

Yes. It supports DC 0~1000V and AC 0~750V voltage measurement, convenient for on-site electrical safety inspection besides resistance testing.

5. How long is the continuous working time?

Equipped with 6V 4.5Ah rechargeable battery, continuous working time exceeds 100 hours; low battery prompt will appear when power is insufficient.

6. What functions does the data storage and supporting software have?

The tester can store 500 groups of measurement data. Via USB cable connected to PC, the software realizes real-time monitoring, curve drawing, historical data inquiry, report generation, storage and printing.

7. Does the device have an alarm function?

Yes. Users can preset threshold values. Once the measured resistance or voltage exceeds the set limit, the instrument will send an audible alarm to remind abnormal grounding conditions.

8. Will the instrument shut down automatically?

It will automatically power off after 15 minutes without any operation to save battery power.

9. What is the applicable working environment temperature?

Operating temperature: -10℃ ~ 40℃, humidity below 80%RH; storage temperature ranges from -20℃ to 60℃, adaptable to most indoor and outdoor power site environments.

10. Is the instrument safe for high voltage field operation?

It complies with IEC61010 CAT III safety standard, built-in overload protection, circuit withstand voltage up to 3700V, effectively preventing high voltage damage to the main unit and operators.

11. How long is the test line? What accessories are equipped?

Comes with two 5m red test leads and two 5m black test leads, long enough for large grounding grid on-site measurement.

12. Is regular calibration required?

Yes. The instrument is delivered with a factory calibration certificate. Periodic calibration is recommended to keep long-term measuring accuracy, complying with domestic power industry verification regulations.

13. What occasions need equipotential bonding testing?

Lightning protection grounding engineering, computer room anti-static grounding, substation metal structure connection, petroleum station grounding system, production line equipment grounding, etc.

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