Extech GRT350 Operating Manual
User Manual
Earth Resistance and Resistivity Tester
Model GRT350
Additional User Manual Translations available at www.extech.com
GRT350-en-GB_v1.4 12/17
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
Auto-Ranging
Earth resistance testing with three ranges: 0-20Ω/0-200Ω/0-2kΩ
Earth voltage measuring range of 0-300Vac
Automatic C (current) spike check.
Automatic P (potential) spike check.
2-wire test
3-wire test
4-wire test
Earth Resistivity (Wenner – 4 terminal)
Auto power off
Low battery indicator
Data hold
200 memory locations to save test data
Safety standard: EN 61010-1 CATIV 300V, EN 61326-1
GRT350-en-GB_v1.4 12/17
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Safety Information
Read the all safety information carefully before attempting to operate the meter.
Use the meter only as specified in this manual. Otherwise, the protection provided by the
meter may be impaired.
Rated environmental conditions:
Indoor & outdoor use
Installation Category IV 300V
Pollution Degree 2
Altitude up to 2000m
Relative Humidity 80% maximum
Ambient temperature 0-40°C
Observe the International Electrical Symbols listed below:
Double insulation
This symbol, adjacent to a terminal, indicates that, under normal use, hazardous
voltages may be present
This symbol, adjacent to another symbol or terminal, indicates the user must refer
to the manual for further information.
Earth (ground) terminal
Equipment complies with current EU directives
WARNING
To avoid electrical shock, do not touch the terminals during tests
Never apply Voltage higher than 300V across P1 and P2 terminals
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