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Summary of Contents for Extech Instruments GRT300
- Page 1 User Guide 4 wire Earth Resistance Tester Model GRT300...
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Page 2: Safety Notes
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. -
Page 3: Meter Description
(Yellow test lead connection) C2 terminal (Red test lead connection) Display Rc LED Rp LED 2 Wire button 3 Wire button 10. 4 Wire button 11. ACV button 12. Power button 8 9 10 11 12 13 13. TEST/STOP button GRT300-EU-EN v1.1 08/13... -
Page 4: Operation
Press the "ACV" button and then the "TEST/STOP" button. 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. GRT300-EU-EN v1.1 08/13... - Page 5 (1) Earth electrode (rod) under test (2) Potential spike (3) Current spike Three-terminal earth resistance measurements MAX. AC 300V (1) Earth electrode (rod) under test (2) Potential spike (3) Current spike Two-terminal earth resistance measurements MAX. AC 300V (1) Earth electrode (rod) under test (2) Potential spike GRT300-EU-EN v1.1 08/13...
- Page 6 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. GRT300-EU-EN v1.1 08/13...
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Page 7: Maintenance
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. GRT300-EU-EN v1.1 08/13... -
Page 8: Specifications
Operating : 0 to 50°C (32 to 122°F) 80%R.H. Storage : -10 to 60°C (14 to 140°F) 80%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 GRT300-EU-EN v1.1 08/13... - Page 9 Copyright © 2013 FLIR Systems, Inc. All rights reserved including the right of reproduction in whole or in part in any form ISO‐9001 Certified www.extech.com GRT300-EU-EN v1.1 08/13...
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