GRT300-EU-EN v1.1 08/13
2
Introduction
Congratulations on your purchase of Extech’s 4 Wire Earth Resistance Tester. The Model GRT300
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. Proper use and care of this meter will provide many years of reliable service.
Safety Notes
Read the all safety information carefully before attempting to operate or service 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% max.
Ambient temperature 0-40°C.
Observe the International Electrical Symbols listed below :
Detector is protected throughout by double insulation or reinforced insulation.
Warning ! Risk of electric shock.
Caution ! Refer to this manual before using the detector.
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.
