User`s Manual Earth Ground Resistance Tester
Contents
1. A Return Authorization RA number must be issued before any product is returned to Extech The sender is responsible for shipping charges freight insurance and proper packaging to prevent damage in transit This warranty does not apply to defects resulting from action of the user such as misuse improper wiring operation outside of specification improper maintenance or repair or unauthorized modification Extech specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and will not be liable for any direct indirect incidental or consequential damages Extech s total liability is limited to repair or replacement of the product The warranty set forth above is inclusive and no other warranty whether written or oral is expressed or implied Safety Please read the following safety information carefully before attempting to operate the meter and use the meter only as specified in this manual Environmental safety information e Do not use meter outdoors when precipitation is likely e Installation Category III e Pollution degree 2 e Altitude 2000 meters max e Ambient conditions 32 to 104 F 0 to 40 C RH 80 max e Observe the following international safety warning symbols Safety Symbols Caution Refer to this manual before using this meter A Dangerous Voltages O Meter is protected throughout by double or reinforced insulation Organizations that provide rules and guidelines for prop2. User s Manual EXTECH INSTRUMENTS Earth Ground Resistance Tester Model 382152 DIGITAL EARTH RESISTANCE TESTER EXTECH 382152 Introduction Congratulations on your purchase of the Extech Earth Ground Resistance Tester This device can measure resistance in 3 ranges and AC voltage to 200V 2mA constant current test signal permits earth resistance tests without tripping current breakers in the circuit under test Single momentary tests or automatic 3 minute tests can be selected This device was designed to meet IEC 1010 EN 61010 safety standards Earth Ground Resistance Testers are useful for e Estimating ground resistance of a proposed substation or transmission tower e Computing inductive coupling between neighboring power and communication circuits e Designing cathode protection systems e Geological surveys Careful use of this meter will provide years of reliable service Warranty EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and workmanship for one year from date of shipment a six month limited warranty applies on sensors and cables If it should become necessary to return the instrument for service during or beyond the warranty period contact the Customer Service Department at 781 890 7440 ext 210 for authorization or visit our website at www extech com click on Contact Extech and go to Service Department to request an RA number
3. er grounding e The National Electrical Code NEC e Underwriters Laboratories UL e National Fire Protection Association NFPA e American National Standards Institute ANSI e Occupational Safety Health Administration OSHA e Telecommunications Industry Standard TIA 2 Model 382152 Ver 1 7 October 2001 Specifications Measurements Display Data hold Automatic Test Measurement triggers Test lead length Power supply Low battery indication Over range indication Safety Weight Dimensions Supplied accessories Range Specifications Measurement 3 1 2 digit 1999 count LCD with LED test status indicator Test leads 3 auxiliary earth bars 2 six AA batteries and carrying case Earth Ground Resistance 2mA test current 820Hz Earth Voltage Frequency 40 to 500Hz Meter Description 20 200 20002 0 010 0 10 12 2 rdg 2 d or 0 1 whichever is greater 0 to 200VAC 1 rdg 2d 1 Earth ground test lead terminal 2 Test status LED 3 Data Hold switch 4 5 LCD Display 6 7 Function select switch 8 9 10 Automatic 3 min test OFF button C1 P1 Aux bar test lead terminals Resistance range select switch Push button momentary test Automatic 3 min test ON button DIGITAL EARTH RESISTANCE TESTER 3 Model 382152 Ver 1 7 October 2001 Operation Test Connection Diagram lt Ground surface equidistant Existing 17 to 33 ft g
4. found and corrected before testing can continue 4 Model 382152 Ver 1 7 October 2001 Earth Resistance Test ae Set the meter s function switch to the ohms position and set the range switch to the desired resistance range Press the PUSH ON button to perform a single momentary test Press the PUSH ON and TIMER ON buttons simultaneously to begin a 3 minute test 3 minute tests automatically shut down after 3 minutes Press the Timer OFF button to end an automatic test at any time 4 Note the displayed reading The front panel test status LED will light if the test is operating correctly If the LED does not light check for problems such as open circuits or overload conditions 5 If high resistance is detected note the value and take appropriate steps to correct the ground connection if necessary 6 Readings between 300 to 600Q in the 2kQ range are typical when the test leads are not connected to the meter Data Hold Data Hold freezes the latest measurement reading on the LCD f 2 3 4 Select ON from the Data Hold selector switch to turn Data Hold ON The reading that was on the display when the switch was set is now held on the LCD The Data Hold function does not retain measurement data if the meter is turned off Select OFF from the Data Hold selector switch to return meter to normal operation 5 Model 382152 Ver 1 7 October 2001 Maintenance Battery Replacement When the low battery icon B appears on
5. round connection 5 to 10m apart Test Preparation and Setup 1 Connect the test leads to the meter as follows e Green lead to the E terminal e Yellow lead to the P terminal e Red lead to the C terminal 2 Drive the Auxiliary Earth Bars C1 amp P1 included into the ground Align the bars equidistant to the existing Earth ground connection and in a straight line as shown in the diagram above 3 Ensure that the bars are between 17 and 33 ft 5 and 10 meters apart If the auxiliary bars are placed in close proximity to the ground stake measurement inaccuracies will result 4 Connect the clamp ends of the test leads to the Earth bars and existing ground connection spike as shown above Earth Voltage Test 1 Set the meter s function switch to the ACV position 2 Press the PUSH ON button to perform a single momentary test 3 Press the PUSH ON and TIMER ON buttons simultaneously to begin a 3 minute test The 3 minute test automatically shuts down after 3 minutes Press the Timer OFF button to end an automatic test at any time 4 The front panel test status LED will light if the test is operating correctly If the LED does not light check for problems such as open circuits or overload conditions Note the LCD reading 6 Confirm that the voltage measurement is less than 10V AC otherwise accurate Earth resistance measurements cannot be made If voltage is present higher than 10V AC the source of the voltage must be
6. the LCD the meter s batteries must be changed 1 2 3 4 Remove power and disconnect the test leads from the meter Remove the rear battery compartment screw with a Phillips head screwdriver Remove the battery compartment cover and replace the six 1 5V AA batteries Affix compartment cover and tighten screw Cleaning and Storage Periodically wipe the meter s case with a damp cloth and mild detergent do not use abrasives or solvents If the meter is not to be used for a period longer than 60 days remove the batteries and store them separately Calibration and Repair Services Extech offers complete repair and calibration services for all of the products we sell For periodic calibration NIST certification or repair of any Extech product call customer service for details on services available Extech recommends that calibration be performed on an annual basis to ensure calibration integrity T Support Hotline 781 890 7440 Tech support Ext 200 Email support extech com Repair Returns Ext 210 Email repair extech com Website www extech com Copyright 2001 Extech Instruments Corporation All rights reserved including the right of reproduction in whole or in part in any form 6 Model 382152 Ver 1 7 October 2001
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