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HF-GT-209 Clamp Ground Resistance Tester
This portable Clamp Ground Resistance Tester requires no auxiliary grounding rods. It can rapidly and safely detect grounding resistance values, extensively applied in substations, construction projects and power grid routine grounding tests.
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The clamp ground resistance tester is a portable professional power measuring instrument dedicated to grounding resistance detection. Without auxiliary ground stakes, it clamps the grounding conductor directly for fast loop resistance measurement. Equipped with color display, data storage, over-limit alarm and anti-interference design, it features stable precision and rugged dustproof, moistureproof, shockproof housing. Widely used for regular earthing tests in substations, power grids, factories, communication rooms and lightning protection facilities.
Product Features
The HF-GT-209 Series Stake-Type Clamp Ground Resistance Tester, also known as loop resistance tester, is designed for grounding resistance measurement. Equipped with a brand-new 2.4-inch high-definition color screen, it supports measurements including clamp resistance, 3/4-wire resistance, AC voltage and current. It also features data storage, data review, alarm prompt and auto power-off functions.
Boasting an elegant premium appearance, the device features wide measuring range, high resolution, easy operation and portability, alongside accurate readings, reliable performance, strong stability and excellent anti-interference capability. Built with shockproof, dustproof and moisture-proof construction, it serves as an indispensable instrument widely adopted by telecommunications, power, meteorology, computer room, petroleum sectors, electromechanical installation & maintenance teams, and industrial enterprises powered by electricity.
It is applicable for measuring grounding resistance of telecommunication facilities, power systems, meteorological stations, computer rooms, oil fields, power distribution lines, transmission towers, gas stations, factory grounding grids, lightning rods and more. Controlled by a microprocessor, the HF-GT-209 Series delivers precise grounding resistance measurement. Adopting high-speed filtering technology, it minimizes external interference, and is additionally furnished with data storage and data upload functions.
Technical Specifications
| Item | Parameters |
|---|---|
| Functions | Ground resistance test, loop resistance test, AC current test, AC voltage test |
| Temperature & Humidity for Accuracy Guarantee | 23℃±5℃, relative humidity ≤75%RH |
| Power Supply | 3.7V DC Lithium Battery |
| Resistance Resolution | 0.01Ω |
| Current Resolution | 0.001mA |
| Voltage Resolution | 0.01V |
| Clamp Jaw Size | 68 mm |
| Display Mode | 2.4-inch Color LCD Screen |
| LCD Dimensions | 46mm × 29mm |
| Meter Overall Dimensions (L×W×H) | 273mm × 106mm × 53mm |
| Measuring Rate | 1 reading per second |
| USB Port | Equipped with USB interface; stored data can be uploaded to PC for saving & printing |
| Communication Cable | 1 USB communication cable |
| Data Storage | Max. 100 groups of data; “FULL” icon indicates full storage |
| Overrange Indication | “OL” symbol displayed upon overrange overflow |
| Alarm Function | Audible alarm triggered when measured value exceeds preset threshold |
| Battery Voltage | Real-time battery level display; low battery reminder for timely charging |
| Auto Power Off | Automatically powers off 15 minutes after startup |
| Max Power Consumption | 750mA |
| Weight | 975g (including battery) |
| Operating Temperature & Humidity | -10℃ ~ 40℃, relative humidity ≤80%RH |
| Storage Temperature & Humidity | -20℃ ~ 60℃, relative humidity ≤70%RH |
| Insulation Resistance | ≥20MΩ (500V between circuit and housing) |
| Withstand Voltage | AC 3700V/rms (between circuit and housing) |
| External Magnetic Field Immunity | < 40A/m |
| External Electric Field Immunity | < 1V/m |
| Compliant Safety Standards | IEC61010-1 (CAT III 300V, CAT IV 150V, Pollution Degree 2); IEC61010-031; IEC61557-1 (Ground Resistance) |
Packing List
| No. | Item Name | Qty | Unit |
|---|---|---|---|
| 1 | Main Tester Unit | 1 | Set |
| 2 | Test Leads | 4 | Piece |
| 3 | Auxiliary Short Test Leads | 2 | Piece |
| 4 | USB Communication Cable | 1 | Piece |
| 5 | Charger | 1 | Piece |
| 6 | Monitoring Software CD | 1 | Copy |
| 7 | User Manual & Warranty Certificate | 1 | Set |
| 8 | Carrying Case | 1 | Piece |
FAQ for Clamp Ground Resistance Tester
Q: What is the working principle of a clamp ground resistance tester?
A: It adopts the loop electromagnetic induction principle. The clamp head emits excitation signal and receives feedback signal to calculate total loop grounding resistance without driving auxiliary ground stakes.
Q: When should I choose this clamp type tester instead of the traditional 3/4-wire ground resistance tester?
A: Ideal for measuring clustered grounding grids, tower grounding, lightning rods and equipment earthing terminals. It saves much time as no ground rods need to be buried outdoors.
Q: What objects can this instrument measure grounding resistance for?
A: Power distribution lines, transmission towers, factory grounding grids, oil fields, communication base stations, computer rooms, gas stations and all kinds of lightning protection earthing devices.
Q: What is the maximum storage capacity of the device? Can data be exported to a computer?
A: It can store up to 100 groups of measurement data. Built-in USB interface supports data uploading to PC for viewing, saving and printing via matched monitoring software.
Q: Will strong external electromagnetic fields affect measurement accuracy?
A: Equipped with fast digital filtering technology. It can resist external magnetic field below 40A/m and electric field below 1V/m, ensuring stable readings under on-site power system interference.
Q: How does the over-limit alarm function work?
A: You can preset a resistance threshold in advance. Once the measured grounding resistance exceeds the set value, the tester will send out an audible alarm prompt automatically.
Q: Does the meter have an auto power-off function?
A: Yes. It will shut down automatically 15 minutes after last operation to save lithium battery power. Real-time battery level display and low-battery reminder are also available.
Q: What are the applicable working temperature and humidity ranges? Can it work outdoors on rainy days?
A: Operating range: -10℃ ~ 40℃, humidity ≤80%RH. It features dustproof, moisture-proof and shockproof structure, but cannot be used in heavy rain directly to avoid internal damp damage.
Q: Which international safety standards does this tester comply with?
A: It conforms to IEC61010-1, IEC61010-031 and IEC61557-1 safety standards, with CAT III 300V / CAT IV 150V overvoltage protection for safe power site operation.
Q: What standard accessories are included in the full set package?
A: Main tester, test leads, USB cable, charger, monitoring software CD, user manual, warranty card and dedicated portable carrying case.
Q: How long can the built-in 3.7V lithium battery last on a full charge?
A: Under normal intermittent measurement, it can continuously work for more than 8 hours; low power will trigger reminder for timely charging.
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