Digital Earth Resistance and Soil Resistivity Tester with Double Clamps

Model: GRT-300

The GRT-300 is a comprehensive instrument for measuring earth resistance by precision 4-wire method, 3-wire method, simple 2-wire method, selection method or double clamps method, as well as for measuring soil resistivity and ground voltage.

With the design of large-caliber current clamp and the use of double clamp measuring technology, the GRT-300 is capable of performing on-line measurement without the need to install auxiliary pole and isolate the grounding body from the equipment.

The GRT-300 tester is rated to IP54 making it truly an outdoor instrument. A large, clear, easy to read backlit LCD display and thumb sized test buttons makes the instrument particularly suited to the outdoor conditions of ground testing.

The GRT-300 Digital Earth Resistance and Soil Resistivity Tester is powered from 6V/4.5Ah lead-acid battery which are widely available and deliver excellent testing time, and last more than 100 hours for standby. The battery charger is built in and the instrument is supplied with an adaptor. The battery status is display using a bar-graph.

The GRT-300 tester complies with stringent safety standards and are rated to CAT III 300V and CAT IV 150V. The ground impedance complies with IEC61557-1, and the soil resistivity complies with IEC61557-5.

Technical Data

Measuring Rang and Accuracy

HAOMAI ELECTRIC TEST EQUIPMENT CO.,LTD, as a subsidiary of HAOMAI ELECTRIC POWER AUTOMATION CO.,LTD, located in Shenzhen of China, mainly focuses on the sales and services of Protection Relay Test Set, Instrument Transformer Test Set, CT/PT Analyzer, Power Transformer Test Set, Circuit Breaker Testing Equipment, Battery Testing Equipment, IEC 61850 Testing Equipment for Smart Substation, Partial Discharge Detector, Transformer Oil Dissolved Gas Analysis and Moisture Monitor etc. electrical test equipment and online monitoring equipment.

The headquarters, HAOMAI ELECTRIC POWER AUTOMATION is established in 1999 and located in Wuhan of China, which is specialized in developing and manufacturing electrical test equipment and online monitoring equipment. HAOMAI products are widely used in power grid, petrochemical, metallurgy, railway, coal mine, research institutes and all kinds of large-scale factories or enterprises.

HAOMAI follows total quality criteria, and always maintains standardized process and procedures for continuous growth. HAOMAI has been certified by ISO 9001:2015, ISO 14001:2015 and ISO 45001:2018. All of HAOMAI products passed Type Test or Calibration in the third party laboratory accredited under ISO/IEC 17025.

HAOMAI builds own RELAYSTAR laboratory and performance test laboratory, and possesses professional production equipment and testing instruments in factory, such as Agilent 34401A 6 1/2 High-precision Meter, FLUKE Multi-meter, EMH Standard Meter, CLOU Standard Power Source, Oscilloscope, Phase Meter, Insulation Test System, High Voltage Dividers, AC High Voltage Generator, Time Calibration Tester, Standard Micro-resistance etc.

HAOMAI is China well-known mark recognized and approved by State Administration for Industry & Commerce of People's Republic of China, and enjoys high reputation in domestic and foreign markets.

HAOMAI now is the key supplier for SGCC(State Grid Corporation of China) and CSG(China Southern Power Grid). Till 2021 HAOMAI products have been sold to 39 different countries.

HAOMAI always sticks to the faith of "cooperation and sharing", takes the "technology and market" as the direction, "creation and innovation" as the soul, listens to clients carefully, and improves the technology, upgrades the products, optimizes the service and tries all to be the global leader in electrical test and measurement instruments field.