GP-1 Earth Tester Ground Probe Product Manual
Contents
1. 25 26 27 28 29 30 31 32 33 34 35 36 37 38 Page 17 gt Specifications RESISTANCE Range 0 19 992 20 0 199 92 200 19992 Accuracy RESISTIVITY Range 0 19 99Qm 20 0 199 9Qm 200 1999Q2m 2 00k 19 9kQm 20 0k 199 9kQm 200k 314Qm Accuracy Test current Test Frequency VOLTAGE Range 0 600VRms max INCLUDED ACCESSORIES Model GP CS Model GP MR Model GP TL Model GP RS232 Model GP BP Download Software GENERAL Fuse Input Power Display Weight Dimensions WxHxL Nominal Temp Range Working Temp Range Storage Temp Range STANDARDS Constructed according to Ground resistance measurement Radio frequency emission Radio frequency immunity Page 18 Resolution 0 01 0 1 1 2 of reading 2 Digits Resolution 0 01 0 1 1 10 100 1000 2 of reading 2ma 0 02Q where p lt 19 992 2na 2 of reading 2na 0 29 where 19 990 lt p lt 199 92 2na 2 of reading 2ma 2Q where 19 999 lt p 2na lt 10mARwms sine wave 135 Hz 1Hz 2 of reading 2 Digits 1 30 10m Green test cable 1 30 10m Black test cable 1 47 15 5m Red Test cable 1 77 25 5m Blue test cable 4 9 measuring rods 1 Safety banana test lead set 1 9 pin male to 9 pin female RS 232 cable 1 Black shoulder pouch 5 x 20mm 32mA 2502. the leads together 3 Turn the GP 1 power ON 4 Turn the GP 1 selector switch to Test B GROUND EARTH CONTINUITY lt ly 5 Press SAVE button k will be displayed 6 Push and release the START button The display will remain blank for approximately five seconds The resistance of the test leads will then be displayed for another five seconds and finally the unit will null and display 00Q The maximum resistance of test leads that the GP 1 can nullify is five ohms The instrument will remain calibrated until the batteries are discharged or replaced 7 Disconnect the short from the test leads and apply the test leads to the circuit under test 8 Press the START button until a stabilized result is displayed then release The display will go blank and then display the measurement of resistance in ohms Rg Note the value of Rg or press the SAVE button The value of Rg will be saved to the next available memory location Note the memory location Page 9 gt Electrode or Grid System Resistance Test C amp D A Warning The power must be turned OFF the electrode must be isolated from the utility ground building steel or any other ground in order for the GP 1 to correctly measure the resistance value of an earth ground electrode Test C Before isolating the electrode under test verify that power is OFF by e Measuring the voltage from the grounding conductor to a reliable earth ground Us
3. 10 Value P2 62 is the resistance of the ground rod Drawing 1 GOOD The electrodes are OK i H exoctive Resistance Areas R diferent between points Pre 52 Pre 62 endPy 72 AR 10 CURE 16 If the effective resistance areas overlap Drawing 2 the resistance differences calculated using Formula 2 would be more than 10 In this case value P2 62 contains error and cannot be used as a value of the electrode ground resistance Drawing 2 WRONG The electrodes are too close ktfective Resistance Areas Distance AR 10 onclusion _ It is recommended to repeat the test at 180 degrees from the initial test The average of both values measured at the P2 62 mark will give you the average earth ground resistance If you cannot test at 180 degrees then test at 90 degrees If the two measurements greatly vary from each other then it may be wise to perform a third and possibly a fourth test As an additional test continue to move electrodes in cross effect see drawing at right This is a good way to check the accuracy of the tests Directions recommended for placing testing electrodes to obtain better accuracy of Existing _ measurements ground rod Page 14 gt Voltage Measurement A Warning Do not attempt measurement of voltages above 600 VAC or circuit damage and or electric shock may result Voltage measurement must be made with test leads in C1 and C2 with the function swit
4. A AMPROBEs GP 1 EARTH TESTER GROUND PROBE User s Manual Amprobe thanks you for purchasing the GP 1 For your safety please read this instruction manual in its entirety Part No 947749 revA 7 2000 A SAFETY PRECAUTIONS amp WARNINGS A 1 Read this manual in its entirety before proceeding with any testing 2 This equipment should only be used by trained professionals who are familiar with electrical hazards 3 Wear lineman gloves at all times 4 This unit has been designed and tested for user and instrument protection up to 600VAC maximum Any application or mis application of voltages exceeding 600VAC to any part of this unit may result in instrument circuit damage and or lethal electrical shock 5 Never isolate an earth ground electrode until you have confirmed that there is no voltage present and there is less than 50mA of current flowing through it Page 2 gt Table of Contents Instrument Description Items Affecting Ground Electrode Resistance Memory Storage Control Soil Resistivity Test A Wenner Method Two Point Ground Earth Continuity Test B Electrode Resistance Test C amp D Conclusion Voltage Measurement Battery Replacement Field Survey Data Sheet Specifications We recommend the user be equipped with the following items to be fully prepared to perform tests LINEMAN S GLOVES to be worn at all times A NON METALLIC 100 FT TAPE MEASURE TO CORRECTLY SPACE THE TEST RODS CA
5. LCULATOR TO CALCULATE PROPER TEST ROD DISTANCES A 3 LB HAMMER TO POUND TEST RODS IN HARD SOIL WATER TO TREAT SOIL AROUND TEST RODS if necessary A CLEAN CLOTH TO CLEAN RODS AND INSTRUMENT AFTER USE Page 3 gt Instrument Description View of Instrument Controls Battery Cover a Control lead cable cane input port input ports page for details on control RS 232 panel output port o SE Pee Power ON OFF Fuse Fuse Holder Function selector switch START button Liquid Crystal Battery Cover Display Screw ITEMS AFFECTING GROUND ELECTRODE RESISTANCE The soil s ability to conduct current is dependent on the following 1 The amount of moisture in the soil 2 The quantity of electrolytes 3 The type of electrolytes 4 Adjacent conductors 5 Temperature 6 Electrode depth 7 Electrode diameter 8 Electrode s spacing distance All these factors must be considered when designing an adequate or required ground system Page 4 gt Memory Storage Control View of Control Panel GROUND PROBE GP 1 METER FEET RECALL SELECTOR butt button button SAVE DISTANCE button SELECTOR button SAVE all test results excluding voltage can be saved into memory by pressing the SAVE button Each time the SAVE button is pressed the next consecutive memory location is displayed and the information is saved to that location The RECALL button works in conjunction with
6. V fast blow Amprobe Model 5 x 20 250 32 4 D cells Amprobe Model MN 1300 3 1 2 Digit L C D 3 4 H 7 26 Ibs 3 3kg 13 6 x5 1 x9 8 3 45Cm x 13Cm x 25cm 41 95 F 5 35 C 32 104 F 0 40 C 14 140 F 10 60 C EN61010 1 VDE 0413 Part 7 EN50081 1 EN50082 1 Class B Page 19 ADVANCED TEST PRODUCTS A United Dominion Company Miami Florida Telephone 305 423 7500 Fax 305 423 7554 www amprobe com
7. ation Page 12 gt Electrode Resistance Test C amp D cont d BLUE gt BLACK 52 62 72 100 START 13 Remove P2 RED from the 52 rod and clip to the 72 rod 14 Press and release the START button 15 Note the value of Rg or press the SAVE button The value of Rg will be saved to the next available memory location Note the memory location 16 The electrode resistance is equal to point P2 62 Points P2 52 and P2 72 are used to confirm the accuracy of the measurements The rule of thumb is that in order to perform an accurate measurement the difference in resistances between points marked as P 62 and P 52 as well as between points P 72 To compute differences use following Formula 2 Formula 2 P2 62 P2 52 x 100 lt 10 P2 62 P2 72 P2 62 x 100 lt 10 P2 62 Page 13 If results on Page 13 are more than 10 electrodes must be moved farther apart 20 30 of the distance and you must retest If the change of resistance values measured between the rods is less than 10 the resistance value from the point P2 62 rod is the value of the earth ground resistance Explanation An auxiliary electrode P2 should be outside of the effective resistance areas of both the existing ground electrode and the auxiliary electrode C2 as shown on the Drawing 1 In this case the resistance differences calculated using Formula 2 would be less than
8. ch in the voltage position only See seperate software manual for download information VOLTAGE V For software updates refer to Amprobe s website www amprobe com z fe POWER 1 Insert the test leads into C1 and C2 2 Move the function switch to Voltage 3 Turn the GP 1 ON 4 Test for AC voltage Page 15 gt Battery Replacement When batteries need to be replaced BAT will be displayed on your unit Turn the GP 1 power OFF Remove the test leads from the test lead cable input ports With a screwdriver unscrew the battery cover screw by turning counterclockwise Install 4 D size alkaline batteries Amprobe Model MN 1300 or equivalent Note position of battery symbols in holder View of inside battery cover Replace battery cover and battery cover screw Note All memory will be lost if batteries are removed Download memory or record values before replacing batteries Two point calibration must also be performed after battery removal LIMITED WARRANTY Congratulations Your new AMPROBE instrument has been tested by qualified factory technicians according to the long established standards of AMPROBE INSTRUMENT You will find it to be of superior quality and craftsmanship and that this product contains the best in components and workmanship AMPROBE is pleased to extend you a limited warranty against defective materials and or workmanship for a period of on
9. e 1 year from the date of purchase provided that in the opinion of the factory the instrument has not been tampered with or taken apart Should your instrument fail due to defective materials and or workmanship during the one year warranty period return it along with a copy of your dated bill of sale Your bill of sale must iden tify this instrument by model number and serial number For your protection please use the instrument as soon as possible If damaged or should the need arise to return your instrument it must be securely wrapped to prevent damage in transit and sent pre paid via Air Parcel Post insured or U P S where available to Service Division a 7 ADVANCED TEST PRODUCTS A United Dominion Company Miami Florida Telephone 305 423 7500 Fax 305 423 7554 Outside the U S A the local Amprobe representative will assist you Above limited warranty covers repair and replacement of instrument only and no other obligation is stated or implied For Technical Support on this or any Amprobe product call 1 800 327 5060 Page 16 gt Field Survey Data Sheet Date Location Soil Condition WET DAMP DRY MEMORY LOCATION GRID TYPE TEST TYPE DISTANCE OHMS OHM METERS DIRECTION N S E W N Joon 4 jojn o 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
10. e the voltmeter measurement feature on the GP 1 see page 14 e Measuring the leakage current through the electrode using an AMPROBE Model DLC 100 or equivalent Digital Leakage Current Clamp A Warning If more than 50ma of current is flowing through the electrode do not isolate the ground electrode until the source of current is located and turned OFF The following instructions outline the typical approach to perform a test using the fall of potential or 62 method 1 Switch the GP 1 to Test C Earth Resistance 2 Noting color codes connect the four test cables to the input jacks of the instrument 3 Connect the BLACK C1 and GREEN P1 test cables to the isolated electrode under test 4 To determine the distances from the electrode in which to drive the tet rods use the formula on Page 11 Page 10 gt Electrode Resistance Test C amp D cont d Calculate distances between the test rods using formula below C2 Depth of the electrode or diagonal of the grid system x 4 FORMULA 1 P2 at 52 C2 0 52 P2 at 62 C2 0 62 P2 at 72 C2 0 72 For example To test single 10 deep electrode use following formula C2 10 x4 40 P2 at 52 40 0 52 21 P2 at 62 40 0 62 25 P2 at 72 40 0 72 29 Note Inside the top cover of the GP 1 you will find a simplified formula which uses 100 ft or longer distance for electrode C2 This formula holds in mo
11. l be displayed followed by three dashes Repeat for Test B C and D Page 5 gt Soil Resistivity Test Test A Wenner Method Test lead cable input jacks 1 Turn the FUNCTION switch to Soil Resistivity see drawing below 2 Connect the four test cables to C1 C2 P1 and P2 input jacks as indicated in drawing above Please note color codes 3 Insert four test rods in the ground equally spaced from each other using preset distance values in tables on following page Page 6 gt Soil Resistivity Test Test A Tables cont d GP 1 PRESET DISTANCE VALUES IN FEET AND INCHES Depth of the electrodes Distance between electrodes 2 3 3 5 4 7 6 10 g 15 T 20 16 30 Do 40 2 6 50 30 36 60 70 TABLE 1 GP 1 PRESET DISTANCE 20 80 VALUES METRIC SYSTEM Depth of the electrodes Distance between electrodes 5 cm 1 meter 10 cm 2 meters 15 cm 3 meters 20 cm 4 meters 30 cm 6 meters 40 cm 8 meters 50 cm 10 meters 65 cm 13 meters 80 cm 16 meters 95 cm 110 cm 19 meters 22 meters TABLE 2 125 cm 25 meters Page 7 gt Soil Resistivity Test Test A con d METEN RECALL button SELECTOR button ae oa DISTANCE button SELECTOR Function Control Panel butt
12. on selector switch 4 Referring to Table 1 or 2 on previous page press the DIST button to scroll through the preset values until the appropriate distance is displayed Each time you perform a test and change the distances you must go through the same steps 5 To change distance in meters or feet press the m ft button m will be displayed if meters are selected Then press the psr DIST button to scroll through the values until the appropriate distance is displayed Repeat process above if distance is being measured in feet 6 Push and hold START button until a result is START displayed then release Whether you select the lee distance in meters or feet the value will be displayed in ohmmeters Record the value on paper or save it to memory by pressing the SAVE button T C To view the measured resistance from which the GP 1 calculated resistivity from turn the selector switch to TEST D SOIL RESISTANCE and push and release the START button Record the value on paper or save it to memory by pressing SAVE button Page 8 gt 2 Point Ground Earth Continuity Test B NOTE To measure ground rod resistance accurately use test C amp D instead of B It is necessary to familiarize yourself with the meter before doing the Two Point Measurement Test B Calibration is required for this test only 1 Insert two of the desired test leads or cables into the instrument in C1 and C2 jacks 2 Short
13. st cases however in order to get the most accurate measurements we recommend that you use the formula from this manual BLACK 100 5 Clip the BLUE test cable C2 to the 100 test rod and clip the RED P2 test cable to the test rod at the 62 mark 6 Turn the GP 1 ON 7 Press the START button until a stabilized result is displayed then release Page 11 gt Electrode Resistance Test C amp D cont d 8 The possible results are as follows If the test rods are making good contact with the soil all connections are correct and the actual value is less than 2kQ the measured value RG will be displayed in ohms Q Continue to Step 9 If the test rods are making good contact with the soil all connections are correct and the actual value is greater than 2kQ o r over range will be displayed Recheck connections verify rod to soil continuity and treat if necessary and or use longer test rods 9 Note the value of Rg or press the SAVE button The value of Rg at P2 67 will be saved tothe next available memory location Note the memory location This is your elec trode or grid system resistance Perform next steps to assure accuracy of the measurements 10 Remove P2 RED from the 62 rod and clip to the 52 rod 11 Press and release the START button 12 Note the value of Rg or press the SAVE button The value of Rg will be saved in the next available memory location Note the memory loc
14. the function switch When the RCL button is pressed mem and the last memory location will be displayed followed by the value in that location for the test designated by the function switch Continuing to press the RCL button will allow the prior measurements and locations to be displayed The CLEAR button has three functions 1 To clear past memory location before any other button was pressed or function changed after saving After the SAVE button has been pressed press the CLEAR button to clear the last memory location After pressing the CLEAR button the cleared memory location will be displayed followed by clr 2 To CLEAR all memory locations With the function switch in Test A B C or D press the CLEAR button to clear all memory locations After the CLEAR button is pressed clr will flash and mem will be displayed Press the CLEAR button a second time to conclude memory clearing function clr will be displayed for approximately 5 seconds followed by the three dashes 3 To clear all memory locations and reset two point calibration With unit OFF press and hold the CLEAR button then turn the unit ON 5 will be displayed followed by the three dashes All memory locations will be cleared If a two point Test B is to be performed the unit must be calibrated nulled prior to the test To verify that all memory locations have been cleared switch the function switch to Test A then press the RCL button no mem wil
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