X Y Z GROUND RESISTANCE TESTER - AEMC · 2018. 9. 10. · • If stray currents are suspected, one...

GROUND RESISTANCETESTER

E N G L I S H User Manual

3620

!

ZYXC1 P2 C2

I N S T R U M E N T S

ΩPress To

Measure

X-Z Fault

X-Y Hi Resistance

X-Y Hi Noise

GROUND RESISTANCE TESTER

MODEL 3620

REFER TO USER MANUAL

FOR FAULT WARNING LIGHT

EXPLANATIONS

0.5

25

1k

®

Statement of Compliance

Chauvin Arnoux®, Inc. d.b.a. AEMC® Instruments certifies that this instrument has been calibrated using standards and instruments traceable to international standards.

We guarantee that at the time of shipping your instrument has met its published specifications.

An NIST traceable certificate may be requested at the time of purchase, or obtained by returning the instrument to our repair and calibration facility, for a nominal charge.

The recommended calibration interval for this instrument is 12 months and begins on the date of receipt by the customer. For recalibration, please use our calibration services. Refer to our repair and calibration section at www.aemc.com.

Serial #: ______________________________

Catalog #: ______________________________

Model #: 3620

Please fill in the appropriate date as indicated:

Date Received: _________________________________

Date Calibration Due: _______________________

Chauvin Arnoux®, Inc.d.b.a AEMC® Instrumentswww.aemc.com

Table of Contents

1. INTRODUCTION ............................................................................... 3

1.1 International Electrical Symbols ................................................4

1.2 DefinitionofMeasurementCategories .....................................4

1.3 ReceivingYourShipment ..........................................................4

1.4 OrderingInformation .................................................................51.4.1 Kits,AccessoriesandReplacementParts ....................5

2. PRODUCT FEATURES ...................................................................... 6

2.1 ControlFeatures .......................................................................6

2.2 FaultIndicatorLEDs .................................................................72.2.1 X-ZFault .......................................................................72.2.2 X-YHighResistance .....................................................72.2.3 X-YHighNoise .............................................................7

2.3 FaultIndicatorTipsAndSolutions ............................................8

3. SPECIFICATIONS............................................................................. 9

3.1 Electrical ...................................................................................9

3.2 Mechanical ................................................................................9

3.3 Environmental .........................................................................10

3.4 SafetySpecifications ..............................................................10

4. OPERATION .................................................................................. 11

4.1 GroundResistanceValues .....................................................11

4.2 GroundResistanceTestingPrinciple .....................................134.2.1 PositionoftheAuxiliaryElectrodesinMeasurements 14

4.3 MeasuringResistanceofGroundElectrodes (62%Method) ..154.3.1 AuxiliaryElectrodeSpacing ........................................17

4.4 GroundResistanceMeasurementProcedure (3-Point) ..........18

4.5 2-PointMeasurement (SimplifiedMeasurement) ...................19

4.6 ContinuityMeasurement .........................................................20

4.7 HowtoUse25WCalibrationChecker .....................................20

5. MAINTENANCE ............................................................................. 21

5.1 Warning...................................................................................21

5.2 Cleaning ..................................................................................21

5.3 ReplacingtheBattery .............................................................21

5.4 ReplacingtheSafetyFuse ......................................................22

RepairandCalibration ...........................................................................23

TechnicalandSalesAssistance ............................................................23

LimitedWarranty ...................................................................................24

WarrantyRepairs ...................................................................................24

Ground Resistance Tester Model 3620 3

CHAPTER 1

INTRODUCTION

WARNING “It should be impressed on all personnel that a lethal potential can exist between the station ground and a remote ground if a system fault involving the station ground occurs while tests are being made. Since one of the objects of tests on a station ground is the establishment of the location of an effectively remote point for both current and potential electrodes, the leads to the electrodes must be treated as though a possible potential could exist between these test leads and any point on the station ground grid.”

- excerpted from IEEE Std. 81-1962

Thesesafetywarningsareprovidedtoensurethesafetyofper-sonnelandproperoperationoftheinstrument.• The instrumentmust not be operated beyond its specified

operatingrange.• Safetyistheresponsibilityoftheoperator.• Allmetalobjectsorwiresconnectedtotheelectricalsystem

shouldbeassumedtobelethaluntiltested.Groundingsys-temsarenoexception.

• Useextremecautionwhenusingtheinstrumentaroundener-gizedelectricalequipment.

• Neverattempttousetheinstrumenttotwistorprythegroundelectrode or ground wire away from the equipment beinggrounded.

• AEMC®Instrumentsconsiderstheuseofrubberglovestobeanexcellentsafetypracticeeveniftheequipmentisproperlyoperatedandcorrectlygrounded.

• Alwaysinspecttheinstrumentandleadspriortouse.Replaceanydefectivepartsimmediately.

4 Ground Resistance Tester Model 3620

1.1 International Electrical Symbols

This symbol signifies that the instrument is protected by double or rein-forced insulation.This symbol on the instrument indicates a WARNING and that the operator must refer to the user manual for instructions before operating the instrument. In this manual, the symbol preceding instructions indicates that if the instructions are not followed, bodily injury, installation/sample and product damage may result.Risk of electric shock. The voltage at the parts marked with this symbol may be dangerous.

In conformity with WEEE 2002/96/EC

1.2 Definition of Measurement CategoriesCat. IV: For measurements performed at the primary electrical supply

(<1000V) such as on primary overcurrent protection devices, ripple control units, or meters.

Cat. II: Formeasurements performed on circuits directly connected totheelectricaldistributionsystem.Examplesaremeasurementsonhouseholdappliancesorportabletools.

Cat. III: For measurements performed in the building installation atthe distribution level such as on hardwired equipment in fixedinstallationandcircuitbreakers.

1.3 Receiving Your ShipmentUponreceivingyourshipment,makesurethatthecontentsareconsistentwiththepackinglist.Notifyyourdistributorofanymissingitems.Iftheequip-mentappearstobedamaged,fileaclaimimmediatelywiththecarrierandnotifyyourdistributoratonce,givingadetaileddescriptionofanydamage.Savethedamagedpackingcontainertosubstantiateyourclaim.


1.4 Ordering InformationGround Resistance Tester Model 3620 ............................ Cat. #2114.90Includes soft carrying case, batteries and a user manual.

Ground Resistance Tester Model 3620 Kit (150 ft) .........Cat. #2135.10Includes ground tester, two 150 ft color-coded leads on spools (red/blue), one 30 ft lead (green), two T-shaped auxiliary ground electrodes, set of 5 spaded lugs, one 100 ft AEMC® tape measure, batteries, carrying bag, user manual and warranty card.

Ground Resistance Tester Model 3620 Kit (300 ft) ......... Cat. #2135.11Includes ground tester, two 300 ft color-coded leads on spools (red/blue), two 100 ft color-coded leads (hand tied-green/black), four T-shaped auxiliary ground electrodes, set of 5 spaded lugs, one 100 ft AEMC® tape measure, batteries, carrying bag, user manual and warranty card.

Ground Resistance Tester Model 3620 Kit (500 ft) ......... Cat. #2135.11Includes ground tester, two 500 ft color-coded leads on spools (red/blue), two 100 ft color-coded leads (hand tied-green/black), one 30 ft lead (green), four T-shaped auxiliary ground electrodes, set of 5 spaded lugs, one 100 ft AEMC® tape measure, batteries, carrying bag, user manual and warranty card.

1.4.1 Kits, Accessories and Replacement Parts

Test Kit for 3-Point Testing (150 ft) ..................................Cat. #2135.35Includes two 150 ft color-coded leads on spools (red/blue), one 30 ft lead (green), two T-shaped auxiliary ground electrodes, set of 5 spaded lugs, one 100 ft AEMC® tape measure, carrying bag.

Test Kit for 4-Point Testing (300 ft) ..................................Cat. #2135.36Includes two 300 ft color-coded leads on spools (red/blue), two 100 ft color-coded leads (hand-tied, green/black), four T-shaped auxiliary ground electrodes, set of 5 spaded lugs, one 100 ft AEMC® tape measure, carrying bag.

Test Kit for 4-Point Testing (500 ft) ..................................Cat. #2135.37Includes two 500 ft color-coded leads on spools (red/blue), two 100 ft color-coded leads (hand-tied, green/black), one 30 ft lead (green), four T-shaped auxiliary ground electrodes, set of 5 spaded lugs, one 100 ft AEMC® tape measure, carrying bag.

Test Kit for 3-Point Testing (Supplementalfor4-PointTesting) ...Cat. #2135.38Includes two 100 ft color-coded leads (hand-tied, green/black), one 30 ft lead (green), two T-shaped auxiliary ground electrodes, set of 5 spaded lugs, one 100 ft AEMC® tape measure, carrying bag.

25W Calibration Checker ...................................................Cat. #2130.59

Tape Measure – AEMC 100 ft ............................................Cat. #2130.60

Ground Tester Video/Workbook Set ................................Cat. #2130.64

Set of 2, T-Shaped Auxiliary Ground Electrodes ............Cat. #2135.39

Fuse – Set of 5, 0.1A, >250V, 0.25 x 1.25" ........................Cat. #2970.12


CHAPTER 2

PRODUCT FEATURES

2.1 Control Features

!

ZYXC1 P2 C2


ΩPress To

Measure

X-Z Fault

X-Y Hi Resistance

X-Y Hi Noise


MODEL 3620



EXPLANATIONS

0.5

25

1k

®

2 43 51

6

7

891011

Figure 1

1. Press-to-measurebutton 7.Zeroadjustmentscrew2. InputterminalX(C1) 8. Lowbatteryindicator3. InputterminalY(P2) 9.X-Yhinoiseindicator4. Shortinglink 10.X-Yhiresistanceindicator5. InputterminalZ(C2) 11. X-Zfaultindicator6. Display


2.2 Fault Indicator LEDsThethreeLEDindicatorsdescribedbelowconfirmthecorrectmeasure-mentbeingtakenifnoneofthemarelit.

2.2.1 X-Z FaultThisLEDsignalsthatthevoltagebetweenterminalsXandZexceeds30Vpeak.Therearefivepossiblecauses:

• theresistanceofthecurrentcircuitbetweenXandZistoohigh• interferencevoltageinthecurrentcircuitistoohigh• thefuseisblown• thecircuitisopen(leadnotconnected)• whenthereadingisunder0.5W(needleontheleftofthescale)

NOTE: When performing a test this light will initially come on for approxi-mately three seconds until the nominal test voltage is reached and then the light will go out if all indications are normal.

2.2.2 X-Y High Resistance

ThisLEDsignalsthattheresistanceinthevoltagecircuit(betweenXandY)istoohigh(approximately50kW)orthatthecircuitmaybeopen.Flashingwillcontinuethroughoutthemeasurement,eveniftheresistancedrops below the threshold; for example, after reconnecting or loweringauxiliaryrodresistance.Inthiscase,youmustreleasethepush-buttonandpressagainafterthefaulthasbeencorrected.Occasionally,astrayvoltageabove6VDCmayalsosetoffthislight.Checktheleadsforapossiblesolution.

2.2.3 X-Y High Noise

This LED signals the presence of excessive noise (approximately 13Vpeak)inthevoltagecircuit(betweenXandY).Oneremedyistouseshieldedleadsfromtheinstrumenttotheauxiliaryelectrodes.Connectalltheshieldstotherodundertest.


Galvanometer Pointer• Ifthepointerstopsontherightside,thisindicatesthatyoumea-

suredmorethan1000W(over-rangingcondition)orthatthecircuitisopen.

• If thepointerstopsontheleftside,this indicatesthatyoumea-sured less than 0.5W.Thismay also indicate that theX andYrods,ortheXandZrods,wereinverted.

• Checktheconnections.

2.3 Fault Indicator Tips And SolutionsTheLEDindicatorsshowexcessiveelectroderesistanceand/orexcessivetransientnoiseand/orstraycurrent.

In the event of an incorrect measurement indication:• Improvethequalityoftheconnectiontoearthofauxiliaryground

electrodesYandZ.Zisthemostlikelysourceofproblemscausedbyexcessiveelectroderesistance.

• Checkconnectionsforcontinuitybetweenleadsandelectrodes.• Be sure that electrodes are properly inserted; they should be

buriedasmuchaspossible.• Ifhighelectroderesistancestillexistsafterproperlyinsertingaux-

iliaryelectrodes into theearth, trypouringwateronandaroundtheauxiliaryelectrodes.Thiswillimprovetheirelectricalconnec-tiontoearth.

• Ifstraycurrentsaresuspected,onesolutiontoreducetheirinflu-enceistomovebothYandZelectrodesinanarcrelativetotheXelectrode(try,e.g.,a90°shift),andtestagain.

NOTE: Accuracy may be affected by auxiliary ground rod (Ry, Rz) resistance levels and by stray signal levels (earth currents).


CHAPTER 3

SPECIFICATIONS

3.1 ElectricalMeasurement Range: 0.5 to 1000W

Test Current: 10mA

Operating Frequency: 128Hzsquarewave

Accuracy*:5%ofReading±0.1%ofgalvanometerscalelength

Auxiliary Electrode Influence:Rz:3000timesthereadingupto50kWRy:50kW

Voltage Withstand:Unitisfuseprotected.Intheeventofasystemfault,theunitscanwith-stand250Vrmswithspikesof3000VACor1000VDC.

Power Source: Eight1.5V“AA”batteries;Alkalinerecommended

Battery Life:168015-secondmeasurements(approx)

Low Battery Indicator:Ifthe“LowBattery”indicatorlightsup,thebatteriesarelosingpower.Theavailableoperatingtimeremainingis8015-secondmeasurements(approx)

Fuse Protection:Highbreakingcapacity0.1A,>250V,0.25x1.25"*Accuracies and specifications are given for an ambient temperature of 23°C ± 3K, RH of 45 to 55%, battery power at 8V, auxiliary resistance at the measurement terminals <200W, no stray voltage and a magnetic field from 0 to 40A/m.

3.2 MechanicalDimensions:8.7x5.4x5.9"(220x136x150mm)

Weight: 2.9lbs(1.3kg)


Connection: Color-codedterminalsacceptspadelugswithminimumgapof6mmorstandard4mmbananajacks

Meter Movement: Pivotmovement

Scale: 3.1"(77mm)whitescalewithblackpointer

Case: Heavy-duty,ABS

Colors: Case-safetyyellow;Frontpanel-gray

Mechanical Shock: IEC 68-2-27

Vibration: IEC 68-2-6

Drop Test: IEC 68-2-32

Case Material: UL94

Environmental: O-ringsealedagainstdustandwatertoIP50

3.3 EnvironmentalOperating Temperature:14°to131°F(-10°to55°C)

Storage Temperature:-40°to158°F(-40°to70°C); 0to90%RHwithbatteriesremoved

Relative Humidity:20to90%maximum

3.4 Safety Specifications

Electrical:EN61010-1CatlII,Pollutiondegree2,24V

Electromagnetic Compatibility: Emission: EN 50081-1 Immunity: EN 50082-1

*All specifications are subject to change without notice


CHAPTER 4

OPERATION

4.1 Ground Resistance ValuesNEC®2008article250.56regardingtheresistanceofrod,pipeandplateelectrodesstatesthatiftherod,pipe,orplatedoesnothavearesistanceof25Ωorlesstogroundshallbeaugmentedbyoneadditionalelectrodeofanyofthetypesspecifiedby250.52(A)(4)through(A)(8).Wheremultiplerod,pipeorplateelectrodesareinstalledtomeettherequirementsofthesection,theyshallnotbelessthan6feetapart.

FPN:Theparallelingefficiencyofrodslongerthan8feetisimprovedbyspacinggreaterthan6feetapart.

TheNationalElectricalCode® (NEC®)statesthattheresistancetogroundshallnotexceed25W.This isanupper limitandguideline,sincemuchlowerresistanceisrequiredinmanyinstances.

“How low in resistance should a ground be?”An arbitrary answer to this in ohms is difficult. The lower the groundresistance, the safer, and for positive protection of personnel andequipment,itisworththeefforttoaimforlessthanoneohm.Itisgenerallyimpracticaltoreachsuchalowresistancealongadistributionsystemoratransmissionlineorinsmallsubstations.Insomeregions,resistancesof5Worlessmaybeobtainedwithoutmuchtrouble.Inothers,itmaybedifficulttobringresistanceofdrivengroundsbelow100W.

Acceptedindustrystandardsstipulatethattransmissionsubstationsshouldbedesignednottoexceedoneohmresistance.Indistributionsubstations,themaximumrecommendedresistanceis5W.Inmostcases,theburiedgridsystemofanysubstationwillprovidethedesiredresistance.

Inlightindustrialorintelecommunicationscentraloffices,5Wisoftentheacceptedvalue.Forlightningprotection,thearrestersshouldbecoupledwithamaximumgroundresistanceof1W.

Theseparameterscanusuallybemetwiththeproperapplicationofbasicgroundingtheory.Therewillalwaysexistcircumstanceswhichwillmakeit difficult to obtain the ground resistance required by theNEC®.When


thesesituationsdevelop,severalmethodsof loweringthegroundresis-tancecanbeemployed.Theseincludeparallelrodsystems,deepdrivenrod systemsutilizing sectional rods and chemical treatment of the soil.Additionalmethods,discussedinotherpublisheddata,areburiedplates,buried conductors (counterpoise), electrically connected building steel,andelectricallyconnectedconcretereinforcedsteel.

Electricallyconnectingtoexistingwaterandgasdistributionsystemswasoftenconsideredtoyieldlowgroundresistance;however,recentdesignchangesutilizingnon-metallicpipesandinsulatingjointshavemadethismethodofobtaininga lowresistancegroundquestionableand inmanyinstancesunreliable.

Groundrods,ofcourse,willberequiredinhighvoltagetransmissionlines,wheremaximumresistanceof15ohmsisrecommended;andindistribu-tionlines,wheremaximumresistanceof25ohmsispreferred.Allelectri-calsystemsconstructedinaccordancewiththeNationalElectricalCode®, shouldnotexceed25ohms.

Themeasurementofgroundresistancesmayonlybeaccomplishedwithspeciallydesignedtestequipment.MostinstrumentsusetheFallofPoten-tial principleofalternatingcurrent (AC)circulatingbetweenanauxiliaryelectrodeandthegroundelectrodeundertest;thereadingwillbegiveninohmsandrepresentstheresistanceofthegroundelectrodetothesur-roundingearth.AEMC®Instrumentshasalsorecentlyintroducedaclamp-ongroundresistancetester.

Note: The National Electrical Code® and NEC® are registered trademarks of the National Fire Protection Association.


4.2 Ground Resistance Testing Principle (Fall-of-Potential — 3-Point Measurement)

Three-point measurement is used to measure resistance to ground ofgroundrodsandgrids.ThepotentialdifferencebetweenrodsXandYismeasuredbyavoltmeter,andthecurrentflowbetweenrodsXandZismeasuredbyanammeter.

ByOhm’sLawE=RIorR=E/I,wemayobtain thegroundelectroderesistance R.IfE=20VandI=1A,then:

R===20ohmsEI

201

Itisnotnecessarytocarryoutallthemeasurementswhenusingagroundtester.Thegroundtesterwillmeasuredirectlybygeneratingitsowncur-rentanddisplayingtheresistanceofthegroundelectrode.

ZYX

VOLTMETER (E)

AUXILIARYPOTENTIALELECTRODE

GROUNDELECTRODEUNDER TEST

AUXILIARYCURRENTELECTRODE

AMMETER (I)

CURRENTSUPPLY

R

EARTH

Figure 2

NOTE: Terminals X and Xv are shorted together in three-point measurement.


4.2.1 Position of the Auxiliary Electrodes in MeasurementsThegoalinpreciselymeasuringtheresistancetogroundistoplacetheauxiliarycurrentelectrodeZfarenoughfromthegroundelectrodeundertestsothattheauxiliarypotentialelectrodeYwillbeoutsideoftheeffec-tiveresistanceareasofboththegroundelectrodeandtheauxiliarycurrentelectrode.ThebestwaytofindoutiftheauxiliarypotentialrodYisoutsidetheeffectiveresistanceareasistomoveitbetweenXandZandtotakeareadingateachlocation.IftheauxiliarypotentialrodYisinaneffectiveresistancearea(orinbothiftheyoverlap),bydisplacingit,thereadingstakenwillvarynoticeablyinvalue.Undertheseconditions,noexactvaluefortheresistancetogroundmaybedetermined.

100% of DistanceBetween X & Z

Res

ista

nce

Reading Variation

Effective ResistanceAreas (Overlapping)

X Y' Y Y'' Z

Figure 3

On the other hand, if the auxiliary potential rodY is located outside oftheeffectiveresistanceareas,asYismovedbackandforththereadingvariationisminimal.Thereadingstakenshouldberelativelyclosetoeachother,andarethebestvaluesfortheresistancetogroundofthegroundX.Thereadingsshouldbeplottedtoensurethattheylieina“plateau”regionasshowninFigure4.

100% of DistanceBetween X & Z

Res

ista

nce

Reading Variation

Effective ResistanceAreas (No Overlap)

X Y' Y Y'' Z

Figure 4


4.3 Measuring Resistance of Ground Electrodes (62% Method)

The62%methodhasbeenadoptedaftergraphicalconsiderationandafteractualtest. It isthemostaccuratemethodbut is limitedbythefactthatthegroundtestedisasingleunit.Thismethodappliesonlywhenallthreeelectrodesareinastraightlineandthegroundisasingleelectrode,pipe,orplate,etc.,asinFigure5.

Alligator Clips

Ground Rod

Y Electrode Z Electrode

GroundStrip

ZYXC1 P2 C2


!

ΩPress To

Measure

X-Z Fault

X-Y Hi Resistance

X-Y Hi Noise


MODEL 3620



EXPLANATIONS

0.5

25

1k

Figure 5

ConsiderFigure6,whichshowstheeffectiveresistanceareas(concentricshells)ofthegroundelectrodeXandoftheauxiliarycurrentelectrodeZ.Theresistanceareasoverlap.IfreadingsweretakenbymovingtheauxiliarypotentialelectrodeYtowardseitherXorZ,thereadingdifferentialswouldbegreat andone couldnot obtaina readingwithin a reasonablebandoftolerance.Thesensitiveareasoverlapandactconstantlyto increaseresistanceasYismovedawayfromX.


Distance from Y to Ground Electrode

Res

ista

nce

Overlapping EffectiveResistance Areas

X Y Z

GroundElectrodeUnder Test

AuxiliaryPotentialElectrode

AuxiliaryCurrentElectrode

Figure 6

Now consider Figure 7, where the X and Z electrodes are sufficientlyspacedsothattheareasofeffectiveresistancedonotoverlap.Ifweplottheresistance,measuredwefindthatthemeasurementsleveloffwhenYisplacedat62%ofthedistancefromXtoZ,andthatthereadingsoneithersideoftheinitialYsettingaremostlikelytobewithintheestablishedtoleranceband.Thistolerancebandisdefinedbytheuserandexpressedasapercentoftheinitialreading:±2%,±5%,±10%,etc.

Res

ista

nce

Distance from Y to Ground Electrode

Effective ResistanceAreas Do Not Overlap

X Y Z

GroundElectrodeUnder Test

AuxiliaryPotentialElectrode

AuxiliaryCurrentElectrode

D

62% of D 38% of D

Resistance ofAuxiliary CurrentElectrode

Resistance of Earth Electrode

Figure 7


4.3.1 Auxiliary Electrode SpacingNodefinitedistancebetweenXandZcanbegiven,sincethisdistanceisrelativetothediameteroftheelectrodetested,itslength,thehomogeneityof the soil tested, andparticularly, the effective resistanceareas.How-ever,anapproximatedistancemaybedeterminedfromthefollowingchartwhichisgivenforahomogeneoussoilandanelectrodeof1"indiameter.(Foradiameterof1/2",reducethedistanceby10%;foradiameterof2”increasethedistanceby10%.)

Depth Driven Distance to Y Distance to Z 6 ft 45 ft 72 ft 8 ft 50 ft 80 ft 10 ft 55 ft 88 ft 12 ft 60 ft 96 ft 18 ft 71 ft 115 ft 20 ft 74 ft 120 ft 30 ft 86 ft 140 ft

Approximate Distance to Auxiliary ElectrodesUsing the 62% Method


4.4 Ground Resistance Measurement Procedure (3-Point)

WARNING: Use extreme caution when disconnecting the ground connection from the rest of the circuit. Current may be flowing and a dangerous potential could exist between the disconnected wires.

Procedure• DisconnectshortinglinkbetweenYandZ(C2,P2)• ConnectXtothegroundrodtobetested• ConnectY(P2)tothecentralelectrode• ConnectZ(C2)totheouterelectrode• Depressthe“Measure”buttontomeasuregroundresistance

NOTE: When performing a test this light will initially come on for approxi-mately three seconds until the nominal test voltage is reached and then the light will go out if all indications are normal.

ZYXC1 P2 C2


!

ΩPress To

Measure

X-Z Fault

X-Y Hi Resistance

X-Y Hi Noise


MODEL 3620



EXPLANATIONS

0.5

2510

1k

Alligator Clips

Y ZX

52% 62% 72%0% 100% of distancebetween X and Z

Ground Rod Y Electrode Z Electrode

Ground Rod

Y Electrode Z Electrode

GroundStrip

-10% 3rdMeasurement +10% 2nd

Measurement

®

Figure 8


4.5 2-Point Measurement(Simplified Measurement)

NOTE: This is an alternative method to three-point measurement when an excellent ground is already available.

Incongestedareaswherefindingroomtodrivethetwoauxiliarygroundelectrodesmaybeaproblem, the two-pointmeasurementmethodmaybeapplied.Thereadingobtainedwillbethatofthetwogroundsinseries.Therefore,thewaterpipeorothergroundmustbeverylowinresistancesothatitwillbenegligibleinthefinalmeasurement.Thetestleadresistanceswillalsobeincludedinthemeasurementandshouldbedeductedfromthefinalmeasurement.

Thismethodisnotasaccurateasthree-pointmethods(62%method),asitisparticularlyaffectedbythedistancebetweenthetestedelectrodeandthedeadgroundorwaterpipe.

Thismethodshouldnotbeusedasastandardprocedure,butratherasabackupintightareas.

Procedure• ShortYandZ(P2,C2)• ConnectXtogroundrodtobemeasured• ConnectZtoanelectrode• Measureasinthethree-pointmethod

Grounding conductor

Ground level

Ground rod

Butt plate

Utility pole

Auxiliary rod(Y-Z shorted)

ZYXC1 P2 C2


!

ΩPress To

Measure

X-Z Fault

X-Y Hi Resistance

X-Y Hi Noise


MODEL 3620



EXPLANATIONS

0.5

25

1k

®

Figure 9


4.6 Continuity MeasurementConnecttheshortingstripbetweenY(P2)andZ(C2).

Continuity measurement is madewith two leads, one from X, theotherfromY–Z(P2,C2);pushthe“PressToMeasure”buttontomea-sure. Figure 10

4.7 How to Use 25W Calibration CheckerThecalibrationcheckerhasaresistanceof25W.Theproceduretousethecalibrationcheckerisasfollows:

• LoosentheX,YandZterminals.• InserttheresistorasshowninFigure11.• TightendowntheterminalsX,YandZ.• PushdownthePresstoMeasurebutton.• Compare thereadingon thedisplay to themeasurement range

providedonthelabel.

NOTE: For alignment purposes of the test resistor it is best if the shorting link is connected between Y and Z.

ZYXC1 P2 C2


!

ΩPress To

Measure

X-Z Fault

X-Y Hi Resistance

X-Y Hi Noise


MODEL 3620



EXPLANATIONS

0.5

25

1k

®

Figure 11

ZYXC1 P2 C2


!

ΩPress To

Measure

X-Z Fault

X-Y Hi Resistance

X-Y Hi Noise


MODEL 3620



EXPLANATIONS

0.5

25 50

1k

®


CHAPTER 5

MAINTENANCE

5.1 Warning Pleasemakesure thatyouhavealready readand fullyunderstand theWARNINGsectiononpage3.

• Formaintenanceuseonlyspecifiedfactoryreplacementparts.• Toavoidelectricalshock,donotattempttoperformanyservicing

unlessyouarequalifiedtodoso.• Toavoidelectricalshockand/ordamagetotheinstrument,donot

getwaterorother foreignagents into thecase.Turn the instru-mentOFFanddisconnecttheunitfromallcircuitsbeforeopeningthecase.

5.2 Cleaning

WARNING: Disconnect the instrument from any source of electricity.

• Useasoftclothlightlydampenedwithsoapywater.• Rinsewithadampclothandthendrywithadrycloth.• Donotusealcohol,solventsorhydrocarbons.

5.3 Replacing the BatteryTo replace the batteries:

• Loosen the two fastening screws on the battery compartmentcover,whichislocatedonthebottomofthecase(SeeFigure12).

• Removethebatterycompartmentcovertogainaccesstotheeight1.5V“AA”batteries.

• Replacewithnewbatteriesandreassembletheinstrument.


5.4 Replacing the Safety FuseTo replace the fuse:

WARNING: Do not replace the fuse when the instrument is connected.

• Loosen the two fastening screws on the battery compartmentcover,whichislocatedonthebottomofthecase.

• Removethebatterycompartmentcovertogainaccesstothefuseholder.

• Replacethefusewiththeappropriatereplacement(0.1A,>250V,0.25x1.25")andreassembletheinstrument.

! ATTENTIONNE PAS OUVRIR LE BOITIER AVANT D'AVOIRDECONNECTE TOUTES LES ENTREES

! WARNINGDISCONNECT INSTRUMENT FROM ALLINPUTS BEFORE OPENING CASE

SpareFuse

Holders

FuseHolder

Battery CompartmentFastening

ScrewFastening

Screw

Figure 12


Repair and Calibration

Toensurethatyourinstrumentmeetsfactoryspecifications,werecommendthatitbescheduledbacktoourfactoryServiceCenteratone-yearintervalsforrecalibration,orasrequiredbyotherstandardsorinternalprocedures.

For instrument repair and calibration:Youmust contactourServiceCenter foraCustomerServiceAuthorizationNumber(CSA#).Thiswillensurethatwhenyourinstrumentarrives,itwillbetrackedandprocessedpromptly.PleasewritetheCSA#ontheoutsideoftheshipping container. If the instrument is returned for calibration,weneed toknowifyouwantastandardcalibration,oracalibrationtraceabletoN.I.S.T.(Includescalibrationcertificateplusrecordedcalibrationdata).

Ship To: ChauvinArnoux®,Inc.d.b.a.AEMC®Instruments15 Faraday DriveDover,NH03820USAPhone:(800)945-2362(Ext.360)

(603) 749-6434(Ext.360)Fax: (603)742-2346or(603)749-6309E-mail:[email protected]

(Orcontactyourauthorizeddistributor)Costsforrepair,standardcalibration,andcalibrationtraceabletoN.I.S.T.areavailable.NOTE: You must obtain a CSA# before returning any instrument.

Technical and Sales Assistance

Ifyouareexperiencinganytechnicalproblems,orrequireanyassistancewiththeproperoperationorapplicationofyourinstrument,pleasecall,mail,faxore-mailourtechnicalsupportteam:

ChauvinArnoux®,Inc.d.b.a.AEMC®Instruments200FoxboroughBoulevardFoxborough,MA02035USAPhone:(800)343-1391

(508) 698-2115Fax: (508)698-2118E-mail: [email protected]

NOTE: Do not ship Instruments to our Foxborough, MA address.


Limited Warranty

TheModel3620iswarrantedtotheownerforaperiodoftwoyearsfromthe date of original purchase against defects in manufacture. Thislimited warranty is given by AEMC® Instruments, not by the distributorfromwhom itwaspurchased.Thiswarranty isvoid if theunithasbeentamperedwith,abusedorifthedefectisrelatedtoservicenotperformedbyAEMC®Instruments.

For full and detailed warranty coverage, please read the Warranty Coverage Information, which is attached to the Warranty Registration Card (if enclosed) or is available at www.aemc.com. Please keep the Warranty Coverage Information with your records.

What AEMC® Instruments will do:If a malfunction occurs within the warranty period, you may return theinstrument to us for repair, provided we have your warranty registrationinformation on file or a proof of purchase. AEMC® Instruments will, at itsoption,repairorreplacethefaultymaterial.

REGISTER ONLINE AT:www.aemc.com

Warranty Repairs

What you must do to return an Instrument for Warranty Repair: First, request aCustomerServiceAuthorizationNumber (CSA#) by phoneorbyfaxfromourServiceDepartment(seeaddressbelow),thenreturntheinstrumentalongwith thesignedCSAForm.Pleasewrite theCSA#on theoutsideoftheshippingcontainer.Returntheinstrument,postageorshipmentpre-paidto:

Ship To: ChauvinArnoux®,Inc.d.b.a.AEMC®Instruments15FaradayDrive•Dover,NH03820USAPhone:(800)945-2362(Ext.360)

(603) 749-6434(Ext.360)Fax: (603)742-2346or(603)749-6309E-mail:[email protected]

Caution:Toprotectyourselfagainstin-transitloss,werecommendyouinsureyourreturnedmaterial.

NOTE: You must obtain a CSA# before returning any instrument.

08/18

99-MAN100152v12

Chauvin Arnoux®, Inc. d.b.a. AEMC® Instruments15FaradayDrive•Dover,NH03820USA•Phone:(603)749-6434•Fax:(603)742-2346

www.aemc.com

X Y Z GROUND RESISTANCE TESTER - AEMC · 2018. 9. 10. · • If stray currents are suspected, one...

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