Extech 382357 Manual
Contents
1. n 200 then Req by calculation equals l R U Q a i i 0 05 10 10 710 en R 10 0 05 10 05 gt R I 7 382357 EU EN V2 4 2 13 netzerotools com Net Tools netzerotools com amp 800 577 6389 www netzerotools com Applications Telephone Electrical Ground Rods 1 Remove any protective covering from the ground conductor 2 Turn the meter switch to the Ohm Q function 3 Once the start up calibration procedure is completed clamp on to an electrode or ground rod 4 Allow several seconds for the meter to settle and then note the reading Cellular Transmission Towers WARNING Use extreme care when making measurements around transmission towers High Voltage may be present The ground conductor should be located at the base of the tower but your configuration may be different 1 Locate the ground conductor 2 Clamp around the ground conductor You should place the clamp before any splices bonds or other splits in the ground system 3 Read the measured reading Primary Transmission Ground Conductor Tower Branch Ground Conductors 57 EU EN V2 4 2 13 netzerotools com Net Tools netzerotools com G 800 577 6389 Www netzerotools com Service Entrance Note Multiple ground rods multiple grounds i e ground rod s and water pipe grounds or a combination may be present depending on the particular situation In these situations it is necessary to make you2. not specified by the manufacturer the built in protections provided by the meter may be impaired International Safety Symbols This symbol adjacent to another symbol or terminal indicates the user must refer to the manual for further information This symbol adjacent to a terminal indicates that under normal use hazardous voltages may be present 2 382357 EU EN V2 4 2 13 netzerotools com netzerotools com Description 1 Jaw Assembly 2 Hold Button 3 Rotary Selector Switch 4 LCD Display 5 Record Button Ground Resistance HOLD 6 W decrement Button Ciamp Meter xe 7 A increment Button 8 Function Button 9 Measurement Trigger Display Symbols 1 REC Indicates data logging in progress 1 2 3 4 5 2 NO Indicates the READ function 3 wm Clamp jaws are not fully closed 4 NOISE Excessive noise on the ground conductor or rod BE Io e Hi Lo alarm position Function or Record display 5 6 7 Q Ohms resistance measurement 8 mA milli amperes Amperes current measurements 9 H Hold function activated 10 Main display 11 DXh Low Battery 12 Auto Power Off 3 382357 EU EN V2 4 2 13 netzerotools com netzerotools com www Operation Note Ensure that the jaws are fully closed before testing Note DO NOT clamp on to any conductor or open the clamp jaws during the start up self calibration self cal is identified by the
3. 32 to 122 F with lt 85 RH 20 to 60 C 4 to 140 F with lt 75 RH 257 x 100 x 47mm 10 1 x 3 9 x 1 9 1 Albs 640g Resistance check plate 9V battery amp carrying case 12 382357 EU EN V2 4 2 13 netzerotools com netzerotools com Ground Resistance Autorange Specifications Range Resolution Accuracy of reading 0 025 to 0 2500 0 0020 1 5 0 050 0 250 to 1 0000 0 020 1 5 0 050 1 001 to 9 9990 0 020 1 5 0 10 10 00 to 50 000 0 040 2 0 0 30 50 01 to 99 990 0 040 2 0 0 50 100 0 to 200 00 0 40 3 0 1 00 200 1 to 400 0Q 20 5 0 50 400 0 to 600 00 50 10 10Q 600 1 to 15000 209 20 lt 1 V m conductor centered Accuracy Note Loop resistance non inductive external field lt 50A m external electrical field Ground Leakage Current Specifications Range Accuracy of reading 0 300 to 1 000mA 2 0 0 05mA 1 00 to 10 00mA 2 0 0 03mA 10 0 to 100 0mA 2 0 0 3mA Autoranging 100 to 1000mA 2 0 0 3mA 0 20 to 4 00A 2 0 0 03A 4 00 to 30 00A 3 0 0 03A Manual range Notes 50 60Hz bandwidth True RMS sensing Crest Factor lt 3 0 High and Low Alarm programmable Range Resolution High Alarm 0 1510Q 19 netzerotools com
4. LCD counting down from CAL7 to CAL1 Ground Resistance Measurements 1 Open the clamp jaws and check that all surfaces are A clean and free of dust dirt or any foreign substances Clean if necessary 2 Forcefully snap the clamp jaws open and closed several times 3 Turn the meter on by moving the rotary switch to the ohms Q position DO NOT interrupt the start up procedure by opening the clamp jaws or clamping around a conductor During self calibration the meter will display CAL5 CAL4 CAL3 CAL2 and CAL1 4 Once the start up calibration procedure is completed the meter will sound a beep Clamp on to an electrode or ground rod and read the value of ground resistance on the display Ground Leakage Current Measurement 1 Turn the meter on by moving the rotary switch to the mA or A position 2 Clamp on to the electrode or conductor 3 Read the value of leakage current displayed on the LCD HOLD Press the HOLD button to freeze the reading in the display jg will appear in the display Press HOLD again to exit the function 4 382357 EU EN V2 4 2 13 netzerotools com netzerotools com a Net High and Low Alarm 1 2 3 Turn the meter on by moving the rotary switch to the e position Press the FUNC button to view and adjust the HI alarm value Press A or the W button to increase or decrease the value Hold down the button to increase the speed of adjustment The value can b
5. Net Tools netzerotools com 571 6389 USER MANUAL Extech 382357 Clamp On Ground Resistance Tester Extech 382357 NIST Clamp On Ground Resistance Tester Ground Resistance Clamp On Tester MODEL 382357 EXTECH 342357 Ground Resistance Clamp Meter OFF ABRAB netzerotools com Net Tools netzerotools com N 800 577 6389 wew netzerotoois com Introduction Congratulations on your purchase of Extech s 382357 Ground Resistance Tester This Clamp on device allows the user to measure ground resistance without the use of auxiliary ground rods This device can only be used on multi grounded systems It is not necessary to disconnect the ground under test This meter is shipped fully tested and calibrated and with proper use will provide years of reliable service Safety Only qualified technicians should operate this meter Use extreme caution when operating the meter near energized electrical equipment Do not attempt to use this meter to twist or pry the ground electrode or ground wire away from grounded equipment All metal objects or wires connected to the electrical system under test should be assumed to be lethal until tested Grounded systems are no exception Ensure that the batteries are inserted correctly in the battery compartment Remove the batteries from the meter if the meter is to be stored for long periods WARNING If the meter is used in a manner
6. dispose of this instrument in household waste The user is obligated to take end of life devices to a designated collection point for the disposal of electrical and electronic equipment Other Battery Safety Reminders o Never dispose of batteries in a fire Batteries may explode or leak o Never mix battery types Always install new batteries of the same type Clamp Jaw Maintenance The jaws may be brushed clean with a toothbrush or similar soft bristled brush Care must be taken to ensure that the contact fins are not bent or deformed as this will affect the operation of the meter 11 382357 EU EN V2 4 2 13 netzerotools com Specifications netzerotools com General Specifications Resistance Test Frequency Max Conductor size Display Sampling rate Memory Datalogging sample rate Power supply Power consumption Battery Life Temp Coefficient Current Overload Range selection Safety Operating conditions Storage conditions Dimensions Weight Accessories 3 333 kHz 15mV rms approx 23mm 0 9 4 digit 9999 count display 0 5 seconds 116 records 1to 255 seconds One 1 9V battery 40mADC 3000 measurements 0 15 times the specified accuracy per C from 4 to 18 C 39 to 642F and 28 to 50 C 82 to 1222F Protected to 100A Continuous 200A for less than 5 seconds 50 60Hz Automatic ranging Meets the requirements for IEC1010 1 Category III 300V and Category II 600 V Oto 50 C
7. e incremented from 0 to 1500 ohms and then OL overload The value will roll over to 0 after OL is displayed Once the desired value is set press the FUNC button a second time to view and adjust the LO alarm value Press the FUNC button three more times to exit the setting mode The meter will now compare the measured resistance value with the high and low limits when the meter is set to the e position If the reading is larger than the HI value the meter will beep and display HI on the LCD If the reading is lower than the LO value the meter will beep and display LO on the LCD Data Logging Tools 800 571 Setting the Sampling Time 1 2 Press the FUNC button three times until the SEC symbol appears in the LCD display The sampling rate is now displayed in seconds Press the A or the VW button to increase or decrease the value The value can be incremented from 0 to 255 seconds Once the desired value is set press the FUNC button several times until the characters in the upper row of the LCD disappear Recording Data 1 Press the REC button to start recording data at the specified sampling rate The REC symbol will appear on the top of the LCD display To stop recording press the REC button The REC symbol will no longer be displayed on the LCD NOTE Data logging will automatically stop if the memory is filled 116 records or if the meter detects a
8. low battery condition NOTE If the sampling interval is set to 0 only one sample will be recorded To record another sample press REC again 5 382357 EU EN V2 4 2 13 netzerotools com netzerotools com Recalling Stored Data 1 Press the FUNC button four times until the NO symbol is displayed on the LCD The current record number will be displayed in the top row and the data will be displayed below it 2 Press the A or the VW button to step through and read the data in the next memory location Holding down the button will increase the speed of the incrementing value Clearing Data Memory 1 With the meter powered off press and hold down the REC button while turning the meter on The CL symbol will appear on the display indicating that memory has been cleared 6 382357 EU EN V2 4 2 13 netzerotools com netzerotools com Net Measurement Principles Typical multi grounded distribution system Ifthe parallel ground resistances R Rz R3 etc up to Rn are combined as Reg then only R and Reg are AI left in the circuit Rg Vv If a constant voltage is applied to the circuit the following equation applies 1 er TR where R i 1 2 n I eq 1 Ye R If Re and Rj Ro R3 R are approximately the same and n is large 200 for example then Reg will be much less then R and may possibly approach zero Example If R and Rj Ro R3 R are all 10Q respectively and
9. oreign substances Clean if necessary 2 Clamp the meter around the reference loop as shown in the diagram 3 Give the meter a few seconds to settle and read the measurement The meter should display approximately the same value as marked on the reference loop taking into consideration the accuracy listed in the specification chart If the readings are not similar to what is marked on the reference loop consult the Trouble Shooting and Maintenance sections of this manual 10 382357 EU EN V2 4 2 13 netzerotools com netzerotools com Net Tools 800 577 6389 www netzerofools com Maintenance General Care Store the ground resistance tester and reference loop in its case when not in use A damp cloth may be used to clean any surface dirt from the meter Never use harsh detergents abrasives solvents or cleaners on the meter Battery Replacement When the low battery symbol appears on the display replace the meter s 9V battery Use a high quality alkaline battery whenever replacement becomes necessary 1 Remove the two rear screws and open the meter housing 2 Replace the battery close the meter housing and affix the two rear screws Never dispose of used batteries or rechargeable batteries in household waste As consumers users are legally required to take used batteries to appropriate collection sites the retail store where the batteries were purchased or wherever batteries are sold Disposal Do not
10. r measurements between the service entrance neutral and all subsequent ground points Distribution Panel Water Pipe Troubleshooting 1 Snap the jaws open and closed two or three times before turning the meter on 2 Do not clamp on to any device during the power up initialization sequence 3 Snap the jaws two or three times after clamping on to the ground electrode or rod 4 Slight amounts of drift may occur at high resistance measurements this is normal and should not be cause for concern Blank display or any failure mode Replace the battery before proceeding Start up Initialization Failure The start up calibration will continue indefinitely if the jaws are open or dirty Check that the jaws mating surfaces are clean Do not open the jaws while the initialization sequence is running Noise on the Ground Electrode or Rod If noise is present over 3A or 30V on the ground electrode or rod the word NOISE will appear on the display and readings can no longer be considered accurate Before the meter can be used accurately the noise problem must be addressed 9 382357 EU EN V2 4 2 13 netzerotools com netzerotools com e Net Tools 800 577 6389 Www netzerotools com Reference Test Loop The reference test loop is a set of resistors that provides a means to check the performance of the meter 1 Open the measurement jaws and check that the mating surfaces are clean and free of dust dirt or any f
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