Extech Instruments GRT350 User Manual page 2

Introduction
Thank you for selecting the Extech Instruments Model GRT350 Earth Resistance and Resistivity
Tester. The GRT350 has been designed and tested according to the IEC Publication 348, safety
requirements for Electronic Measuring Apparatus, EN 61010‐1, EN 61326‐1, EN 61557‐1, EN
61557‐5 and other safety standards. This device is shipped fully tested and calibrated and, with
proper use, will provide years of reliable service. Please visit our website (www.extech.com) to
check for the latest version of this User Guide, Product Updates, Product Registration, and
Customer Support.
Features

Microprocessor controlled with advanced safety features

Two line LCD display
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Auto‐Ranging
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Earth resistance testing with three ranges: 0‐20Ω/0‐200Ω/0‐2kΩ

Earth voltage measuring range of 0‐300Vac
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Automatic C (current) spike check.
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Automatic P (potential) spike check.
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2‐wire test
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3‐wire test
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4‐wire test
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Earth Resistivity (Wenner – 4 terminal)
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Auto power off
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Low battery indicator
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Data hold
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200 memory locations to save test data
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Safety standard: EN 61010‐1 CATIV 300V, EN 61326‐1
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