User Guide 4 wire Earth Resistance Tester Model GRT300
Contents
1. EN v1 1 08 13 Specifications Measuring Ranges Earth Resistance 0 20 0 200 0 200Q 0 2kQ Earth Voltage 0 300V AC 40 to 500Hz Accuracy Earth Resistance 2 rdg 3dgt Earth Voltage 2 rdg 3dgt Earth Resistance 0 20 0 010 Resolution 0 200 0 10 0 2000 10 0 2kQ 0 01kQ Test Frequency 820Hz Test Current 2mA Temperature amp Humidity Operating 0 to 50 C 32 to 122 F lt 80 R H Storage 10 to 60 C 14 to 140 F S80 R H Power Source 1 5V AA x 8 Dimensions 250 L x 190 W x 110 D mm 9 84x7 5x4 33 Weight Approx 1430g battery included Fuse 0 1A 250V 5 x 20mm 8 GRT300 EU EN v1 1 08 13 Copyright 2013 FLIR Systems Inc All rights reserved including the right of reproduction in whole or in part in any form 1SO 9001 Certified www extech com 9 GRT300 EU EN v1 1 08 132. User Guide EXTECH INSTRUMENTS 4 wire Earth Resistance Tester Model GRT300 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 amp 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 2 Detector is protected throughout by double insulation or reinforced insulation 4 Warning Risk of electric shock A 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 2 GRT300 EU EN v1 1 08 13 Features Microprocessor controlled with
3. advanced safety features Two line LCD display Auto Ranging Earth resistance testing with four ranges 0 20 0 200 0 2000 0 2kQ Earth voltage measuring range of 0 300Vac Automatic C spike check Automatic P spike check 2 wire test 3 wire test 4 wire test Auto power off Data hold Safety standard EN 61010 1 CATIV 300V EN 61326 1 Meter Description 1 C1 terminal Black test lead connection 2 P1 terminal Green test lead connection 3 P2 terminal Yellow test lead connection 4 C2 terminal Red test lead connection 5 Display 5 6 RcLED 7 RpLED 6 8 2 Wire button 9 3 Wire button 10 4 Wire button 11 ACV button 12 Power button 13 TEST STOP button BIO 3 GRT300 EU EN v1 1 08 13 Operation Battery Voltage check 1 Press the ON OFF button if Battery Low appears on the display replace the batteries Earth Voltage measurement 1 Connect the test leads as shown below ES A OO A P C 1 Earth electrode rod under test 2 Test spike 2 Press the ON OFF button and wait for Select Function to appear on the display 3 Press the ACV button and then the TEST STOP button 4 The earth voltage will be displayed on the display Note When the earth voltage is more than 10V errors in earth resistance measurements may occur Make sure that the indicated value is less than 10V 4 GRT300 EU EN v1 1 08 13 Earth Resistance measurement Note The measured results may be i
4. nfluenced by inductive or capacitive coupling if the test leads are twisted or adjacent to each other When connecting the Probes keep the leads separated Setup Insert the Potential spike and the Current spike if required as deep as possible into the soil The distance between spikes must be 5 to 10 meters 16 to 32 feet Four terminal earth resistance measurements ES S H A Si P C P C 1 Earth electrode rod under test 2 Potential spike 3 Current spike Three terminal earth resistance measurements ES S H 0 T aca O e IN L P 1 Earth electrode rod under test 2 Potential spike 3 Current spike Two terminal earth resistance measurements MAX AC 300V e 1 2 1 Earth electrode rod under test 2 Potential spike 5 GRT300 EU EN v1 1 08 13 Testing Connect the test leads for 2 3 or 4 terminal testing Press the ON OFF button and wait for the Select Function screen to appear Press the 2P 3P or 4P button that agrees with the setup Press TEST STOP button to begin the test The meter will beep while the test is in progress approximately 10 seconds and then the reading will appear on the lower line of the display an BOT Ns Notes Re amp Rp LED indications Rc No test current output Check connections Rp If Rp is on and the display indicates gt 2 kQ the earth resistance is greater than 20000 If in 4P mode the display sh
5. ows Vp Error short circuit C1 black and P1 green Measurement Considerations 2 terminal testing of earth resistance is appropriate for most general purpose testing in normally conductive soil But 2 terminal measurements include test lead and contact resistance in the measurement and the result will be a reading slightly higher than the true earth resistance When measured results are higher than desired or if measurement directives require multi terminal techniques switch to the 3 or 4 terminal techniques as needed 6 GRT300 EU EN v1 1 08 13 Maintenance 1 Rear cover 2 Battery 3 Fuse Fuse Replacement 1 Disconnect the test leads from the instrument 2 Remove the rear cover by removing two screws 3 Remove and replace the fuse with the new one of the same value and size 0 1A 250V 5 x 20mm 4 Replace and secure the rear cover Battery replacement When Battery Low appears on the display replace the batteries 1 Disconnect the test leads from the instrument and remove the rear cover and the batteries 2 The tester s battery is situated under the tester 3 Replace with eight 1 5V AA light batteries taking care to observe correct polarity 4 Reinstall battery holder and the battery cover Cleaning And Storage WARNING To avoid electrical shock or damage to the meter do not get water inside the case Periodically wipe the case with a damp cloth and detergent do not use abrasives or solvents 7 GRT300 EU
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