ETCR 3000 User manual
CONTENT
Warning....................................................................................................1
IIntroduction.........................................................................................3
II MeasuringRangeand Accuracy....................................................4
III TechnicalSpecifications.................................................................4
IV TesterStructure...............................................................................6
VMeasuringPrinciple.........................................................................7
VI. FunctionQuick Check .....................................................................8
VII. Operation Methods .........................................................................8
1SwitchOn/Off.............................................................................8
2Battery VoltageCheck.................................................................8
3InsertandConnectionofRods....................................................8
4EarthingVoltageMeasurement...................................................9
5WireResistance Verification.....................................................10
6Precision Measurement.............................................................10
7SimpleMeasurement................................................................11
8BacklightControl......................................................................13
9AlarmSettings..........................................................................13
10 DataLock/Storage...................................................................13
11 DataReading/Deletion............................................................13
12 DataUpload............................................................................14
VIII. BatteryReplacement...................................................................14
IX Accessories...................................................................................15
-1-
Warning
Thanks foryourpurchase ofETCR3000 DigitalEarth
Resistance Testerofourcompany.Forbetteruse ofthe
product, please make sure:
---toreadthisusermanual indetails.
---toabidebythesafetyregulationsand precautions
strictly.
uThetesterisconformingtoIEC61010ondesign, production
and test.
uUnderanycircumstance,itshall payspecialattention on
safetyinuseofthistester.
uPleasedon tusehigh-frequencysignalgeneratorslikemobile
phone andetc.toavoiderrorduringmeasuring.
uPayattention towordsand symbolsstick on the Tester.
uIt shall makesurethattesterandaccessoriesareingood
condition beforeuse;itcanbeusedonlywhen thereisno
damaged,naked orbroken partintestingwiresorinsulation
layer.
uDuringmeasurement, itisforbidden totouchbareconductors
and circuit undermeasurement.
uBeforemeasurement, pleaseconfirmwhether FUNCTION
rotaryswitchhasbeen set withinthe propermeasuringrange.
uConfirmthatconnectorplugoflead hasbeen inserted inthe
testerinterfaceclosely.
uPleasedon timposeover600VA.C.orD.C.voltageon the
partbetween testingend and interface.Otherwise,itmayhave
damageon the tester.
-2-
uPleasedontmeasureinan inflammableplace.The flame
sparklemaybecauseexplosion.
uDuringusageoftester,pleasestopusingitwhen exposed
metaliscaused bybroken enclosureortestingwires.
uPleasedon tkeeporstorethe testerinthespotwith
high-temperatureand moisture,orcondensation,and under
direct daylight radiation foralongtime.
uForreplacingbattery,pleaseconfirmtestingwirehasmoved
apartthe meter,and FUNCTION rotaryswitchisin “OFF”
position.
uPleaseput theusedbatteriesinappointed collection place.
uTheTesterhasnoautoshut-offfunction.Pleaseset
FUNCTION rotaryswitchto “OFF”afterusage.
uWhen the meterdisplaysbatterylowvoltagesymbol ，and
youneed toreplacethe batteryintime.
uIfthe Testerisnotgoingtobeused foralongperiod,remove
the battery.
uPayattentiontomeasuringrangeandusageenvironment
stipulated forthe Tester.
uThismeasuringdeviceisonlytobeused,disassembled,
adjustedandrepaired byqualified personnelwithauthorization.
uWhen itmaycausehazardbycontinuoususeforthe reason
ofthe Testeritself, it shall immediatelystopusingit and deposit it
at once, leavingit fordisposalbyauthorized agency.
uForrisk ofdangericon inmanual ,usersmustperform
safetyoperationsstrictlyincompliancewiththe manualcontent.
-3-
IIntroduction
ETCR3000 DigitalEarthResistance Tester isspeciallydesigned
and manufactured forfieldmeasurement, adoptingthelatest digital
and micro-processingtechnology,3-poleor2-polemethod for
earthresistancemeasurement, withaunique function ofwire
resistanceverification, anti-interferencecapabilityandtheabilityto
adapttothe environment, toensurehighprecision,highstability
and reliabilityforprolonged measure,whichiswidelyusedin
electricpower,telecommunications,meteorology,oil field,
construction,lightningprotection,industrialelectricalequipment
and otherearthground resistancemeasurement.
ETCR3000 DigitalEarthResistance Tester hasaunique
function ofwireresistanceverification ，moreaccurateon
measuringon-sitelowvalue earthground resistance,whichcan
avoiderrorcaused byresistancechangeduetoprolonged usage
oftestingwire;avoiderrorcaused bytestingwirethatisfailed tobe
fullyinserted intotesterinterfaceorbypoorcontact; avoiderror
caused byusers replacingorlengtheningtestingwires.
ETCR3000 DigitalEarthResistance Tester iscomposed of
hostmachine,monitoringsoftware,testingwires,communication
wiresand others.ThelargeLCD displayof hostmachine iswith
blue backlight and bargraphindicatingthatcan beseen clearly.At
the sametimeitcan store400setsofdata,fulfillinghistorical
inquiryand online real-timemonitoringthrough monitoring
software,dynamicdisplay,withthe maximum,minimum,and
mean indicators,withalarmsettingsand alarmindicator,and with
the functionslikehistoricaldataaccess,reading,preservation,
report forms,printingand soon.
-4-
II MeasuringRangeandAccuracy
Measuring
Functions Measuring
Range Accuracy Resolution
0.01Ω～20Ω0.01Ω
0.1Ω～200Ω0.1Ω
EarthGround
Resistance 1Ω～2000Ω
±1%rdg±3dgt
(Auxiliaryearth
groundresistance
100Ω±5%，voltage
toground＜10V) 1Ω
EarthGround
Voltage 0～600VAC ±1%rdg±3dgt 1V
(Remark:23℃±5℃，below75%rh)
III Technical Specifications
Function Earthground resistancemeasurement, voltageto
groundmeasurement, lowvalueresistance
measurement
PowerSupply DC 9V(Zi-MndrybatteryR14S1.5V6PCS,
continuousstandbyfor300hours)
Backlight Controllablebluebacklight, suitableforuseindark
place.
Measuring
Mode Precise3-polemeasurement,simple2-pole
measurement
Measuring
Method
Earthgroundresistance:ratedcurrentchange-pole
method,measurementcurrent 3mAMax，820Hz；
Voltagetoground:averagevaluerectification
DataMode Averagevalue,maximum, minimum
WireResistance
Verification
Avoiderrorcausedbytestingwirethatisfailedtobe
fullyinsertedintotesterinterfaceorbypoorcontactor
byusers replacing orlengtheningtestingwires,
makingitmoreaccurateforearthgroundresistance
measurement.
DisplayMode 4-digitalsuper-largeLCD display,bluescreen
backlight
Measuring
indicator Duringmeasurement,LEDflashindicator,LCD count
downdisplay
LCD Dimension
128mm×75mm；Displayfield：124mm×67mm
Dimension L×W×H:215mm×190mm×95mm
TestingWires Three wires:eachforRed20m,Yellow10m,and
Green5m
-5-
SimpleTesting
Wire 2wires: eachforRed1.6mandGreen1.6m
Auxiliary
earthingrod 2PCS：Φ10mm×150mm
MeasuringRate
Voltagetoground:about3times/second;earth
groundresistance:about5seconds/time
Measuring
Times
Over5000times
(Measuring10Ωforonetimeon20Ωrangeandtakea
pausefor25s)
CircuitVoltage Measuring voltagetoground:measuringbelowAC
600V
RS232 Interface
Possess RS232interface,softwaresupervision,
storagedatacan beuploadedtocomputer,savedor
printed.
Communication
Wire OnepieceofRS232communicationwire,withlength
1.5m
DataStorage 400 sets,flashdisplay “FULL”icontoindicatestorage
isfull
DataHold Dataholdfunction: “HOLD”icondisplay
DataRead Dataread function: “READ”icon display
Overflow
Display Exceeding measuringrangeoverflowfunction: “OL”
icondisplay
AlarmFunction
When measuring valueexceedsalarmsettingvalue,
thereis “Toot-toot-toot”alarmhint
BatteryVoltage
When batteryvoltagedecreasestoabout7.8V,
batteryvoltagelowicon willdisplay,reminding to
replacebattery.
Backlight：25mAMax
Standby:25mAMax(Backlightshutoff)
Power
Consumption Measurement：70mAMax(Backlight shutoff)
Tester：1443g(including battery)
TestingWires：847g(includingsimplytestingwires)
Auxiliaryearthingrod：468g(2PCS)
Weight
Meterbag：915g
Working
Temperature&
Humidity -10℃～40℃；below80%rh
Storage
temperature&
humidity -20℃～60℃；below70%rh
-6-
Overload
Protection Measuringearthgroundresistance:betweeneach
interfacesof E-P、E-C,AC280V/3seconds
Insulation
Resistance Over10MΩ(betweencircuitand enclosureitis500V)
Withstanding
Voltage AC3700V/rms(Betweencircuitandenclosure)
Electromagnetic
Features Wireless frequency electromagneticfield
Protection Type
IEC61010-1 、IEC1010-2-31 、IEC61557-1,5 、
IEC60529(IP54)、Pollution etc.2、CAT Ⅲ300V
IV TesterStructure
-7-
1. LCD2. Buttonarea 3. Rotaryswitchforselectingfunction
4. RS232 interface5. Interfaceof testingwires
6. C(H)interface:Current electrode
7. P(S) interface: Voltageelectrode
8. Einterface: Earthelectrode9. Testingwires
10. Auxiliaryearthing rod11. Simpleearthingwires
12. Testing probe13. Safetyalligatorclip
VMeasuring Principle
1.Voltagetogroundmeasurementadoptsaveragevaluerectificationmethod.
2.Earthresistancemeasurementwithfall-of-potentialmethod.ACconstant
current I (3mAMax,820Hz)isappliedbetweenthemeasurementobject E
(earthelectrode)and C(currentelectrode),and finding outthepotential
differenceVbetween Eand P(potentialelectrode).
Rx=V/I
3MaximumOperatingError：Operatingerror(B)isanerrorobtainedwithinthe
ratedoperatingconditions,andcalculatedwiththeintrinsicerror(A),whichis
an erroroftheinstrumentused,andtheerror(E)duetovariations.
A：Intrinsicerror
E1：Variationduetopositionchange
E2：Variationduetopowersupplyvoltage
E3：Variationdueto temperaturechange
E4：Variationduetointerferencevoltagechange
-8-
E5：Variationduetocontactelectroderesistance
E7：Variationduetosystemfrequency change
E8：Variationduetosystemvoltagechange
VI. FunctionQuick Check
FUCTIONrotary
switch Switchon/off,Functionshift,Switchgear
Up/downarrow
button Dataread/numericalvaluesettings
Backlightbutton Backlightcontrol
START button Start measuring
MODE button Maximum,MinimumorAveragevalue
mode, Movecursor
CLR button Cleardata/Deletedata
MEM button Datalock/storage/reading
AL button Alarmfunction start/alarmcriticalvalue
settings
VII. Operation Methods
1SwitchOn/Off
Rotate FUNCTION rotaryswitchtofulfillswitchonandoff.When rotary
switchbuttondisplays “OFF”forshut-off. TheTesterhasno autoshut-off
function,sopleaseshutitoff afterusageincaseofbatteryconsumption
saving.
2BatteryVoltageCheck
Afterswitchon,ifLCDdisplayslowbatteryvoltageicon “ ”，which
indicatesthatbatteryvoltageislow,and pleasereplacethebatteryin
compliancewithinstructions.Adequatebatterypowercan ensurethe
accuracyof measurement.
3InsertandConnectionofRods
Shownasthefollowingfigure,sticktheauxiliaryearthrods Pand Cinto
thegrounddeeply.Theyshouldbealignedatanintervalof5-10mfromthe
earthedequipmentundertest.Connectthegreenwiretotheearthed
equipmentundertest, theyellowwiretotheauxiliaryearthrod Pand thered
wiretorodCfromterminalsE, PandCoftheinstrumentinorder.
-9-
Note
Pleasetrytoinsertauxiliaryearthingrod intomoistsoil.Incaseofdry
soil,sand,orgravelland,itrequiresaddingwatertokeep auxiliary
earthing rodinserted placewet. Incaseofconcreteplace,itshall keep
auxiliaryearthing rod flatand add water,andcoverwettowelson earth
ground rod beforemeasurement.
4EarthingVoltageMeasurement
Pleasemakesuretesting wireplug hasbeen totallyinsertedintotesters
corresponding interfaceand itmaycausemeasurementvalueerrorfor
incompleteinsert orpoorcontact.
Thetestercannotbeused forcommercialpowersupplyvoltage
measurement. Forspecialsituation thatneedstomeasure,itcan only
useP,Einterfacetoconnectformeasurement. It isnotallowed to
measurecommercialpowervoltageinthecaseofshortcircuitofP,C
interface.Otherwise,measuringvoltageintheearthing circuitofcutout
switchmaycausecutout switchstart.
Onmeasuring earthing voltage, pleasedonot impose over600V voltage
on measurement connectors.
Onmeasuring earthing voltage,pleasedonottouchmeasured bare
conductorsincaseofelectricshock.
Afterconnectingofauxiliaryearthingrodandtestingwire,shift
FUNCTION rotaryswitchto “EARTHVOLTAGE”position.LCD display
voltagevaluetoground. PleasenotethemeasuredvoltageshallNOTexceed
600V.
Ingeneral,formeasuringearthingvoltage,itisonlytoconnectthe
testingwires correspondingto P, E interface.
Note
Beforemeasuringearthgroundresistance,firstlyplease
confirmvoltagetogroundmustbelowerthan10V.
Otherwise,themeasurementvaluemaycauseexcessive
error.At that time,firstlycutoffpoweronmeasuredearthing
equipmentandmakeresistancemeasurementafterthe
earthingvoltageisreduced.
-10-
5WireResistance Verification
Inordertoimproveprecisionandstabilityoffieldmeasurementofearth
groundresistance,avoiderrorduetowireresistancechangeduetoprolonged
usageoftestingwires;avoiderrorduetotestingwirethatisfailedtobefully
inserted intotesterinterfaceorbypoorcontact; avoiderrorduetousers
replacingorlengtheningtestingwiresandetc.,wireresistanceverificationis
speciallydesigned,asto"20Ω"grade,whichismoreaccurateonlowvalue
resistancemeasurement.
Afterconnection oftesting wireand theTester,connecttheotherend of
alltesting wiresinshort circuit, asthefollowing figure,setFUNCTION rotary
switchtothecorrespondingearthgroundresistancemeasurementposition,
press buttontostartverification.During verification,LEDindicatorflashes,
LCD displays,andafterverification,LEDdisplayswireresistancevalueand
storesit.Forthistimeswitchon,itwillautomaticallydeducttheverifiedwire
resistancevaluefromearthgroundresistancemeasurement.
Itwillnotpreservetheverifiedwireresistancevalueonswitchingoff.It
needsre-verificationfornext timeswitchingon.
6PrecisionMeasurement
Pleasemakesuretesting wireplug hasbeen totallyinsertedintotesters
corresponding interfaceand itmaycausemeasurementvalueerrorfor
incompleteinsert orpoorcontact.
Astolowvalueearthgroundresistancemeasurement, itwill bemore
accurateafterwireresistanceverification.
Onmeasuring earthing voltage,betweenEandCinterface,itwill occur
themaximumvoltageabout50V! Pleasedonotimposevoltageon
measurementinterface.Pleasepayattentiontoavoiding electricshock
accident.
Onmeasuring earthground resistance,testing wirescannotbemixed
around, whichshall bemeasured separately.
Trytochoosethespotwithmorewatertodeeplyburyauxiliaryearthing
rodsPand C,inordertoreduceauxiliaryearthgroundresistanceand
thusreduceindicationerror.
-11-
Thereare3typesofdisplaymodesforearthgroundresistance
measurement:
P----AverageValueDisplay
H----MaximumDisplay
L----MinimumDisplay
Thedefaultdisplayon bootingisaveragevalue,andpress MODE button
toswitchdisplaymode.
Precision measurementearthground resistanceadoptsthree-wire
connection.Afterconnection ofauxiliaryearthing rodand testing wires,set
FUNCITON rotaryswitchto"2000Ω", press "START"button tostart
measuring.Duringmeasurement,LEDindicatorflashes,LCD countdown
displays,and aftermeasurement,LCD displaysmeasuredvalues.Ifthe
displayvaluesaretoosmall,setitto"200Ω","20Ω"inturn,thatistochoose
themostappropriategearpositionformeasurement. Thevaluedisplayedon
themostappropriatepositionisthemeasuredearthgroundresistancevalue.
Aftermeasurement,press MODE button tocheckforthemaximum,
minimumandaveragevalueinthismeasurement.
Aftermeasurement,itmaydeletecurrentmeasuredvaluesbypressing
CLR button.
7SimpleMeasurement
Whenselectcommercialusepowersupplysystemearthasauxiliary
earthelectrode, it must usedetectortoconfirmthat isit theearthground
electrodeforcommercialusepowersupplysystem.
It isforbidden tousethisTestertoconfirmearthelectrodeofcommercial
usepowersupplysystem
Thismethodisasimplemethod formeasurementthatdoesnotuse
auxiliaryearthingrod,taking theearthelectrodewiththeminimalexisting
earthgroundresistancevalueasauxiliaryearthelectrode,andconnectingby
twosimpletestingwires(inwhichC,Pinterfacesareinshortcircuit).Itcan
makeuseofmetalpipes,firehydrantsandothermetalburiedobjects,
commonearthingofcommercialelectricpowersystemorlightningprotection
earthgroundelectrodeand otherstoreplaceauxiliaryearthingrodsC,P,and
payattentiontoremoveoxidelayeron theconnection pointoftheselected
metalauxiliaryearthingobject whenmakingmeasurement.
Earthgroundresistancesimpletestingwireconnectionisasfollowing
figure,and refertoprecisionmeasurementforotheroperations.
-12-
Simplemethodformeasurementofearthgroundresistance,itsreading
on Testeristhetotalvalueofearthgroundresistancevalueofmeasured
earthingobjectandthatofcommercialearthingobject, namely:
RE=RX＋re
Inwhich: RE istheTesterreadingvalue;
RX istheearthground resistancevalueofmeasuredearthing
object;
re istheearthgroundresistancevalueofcommon earthing
objectlikecommercialusepowersystem.
Then,theearthgroundresistancevalueofmeasured earthing objectis:
RX=RE－re
Adoptingsimplemethodformeasurementofearthgroundresistance
shalltrytoselect theearthing objectwithlowvalueastheauxiliaryearth
groundelectrodeandthusthetesterreading valuecanbemore
approachingtotruevalue.Pleasetakeprecedenceinselecting metal
waterpipes,firehydrantsasauxiliaryearthelectrodewhenmeasuring,
and refertothefollowingfigureforapplication.
-13-
Note
Simplemethod formeasurementofearthgroundresistancealsoneeds
toconfirmthatvoltagevaluetoground mustbelowerthan10V.Ifthe
voltagevalueisover10V,themeasurementvalueofearthground
resistancemaycauseerrorand atthattime,itshall firstlycutoff power
on measured earthing equipmentand makeresistancemeasurement
aftertheearthingvoltageisdecreased.
8BacklightControl
Afterstartup,press button toturnon oroff backlight.Thebacklight
function issuitabletodarkspot. Itwilldefaultbacklightturn-offforeach
startup.
9Alarm Settings
Afterstartup,press buttonforabrieftimetoopenorshutoff alarm
function,press buttonforalongtime(about3seconds)toenteralarm
criticalvaluesettings,press or tochangecurrentdigital,press
buttontomovecursorandthenpress buttontostoreandexit.When
measurementvalueislargerthanalarmcriticalsettingsvalueandithas
openedalarmfunction,theTesterwill flashand display iconandgiveout
“toot-toot-toot--”alarming sound.
10 DataLock/Storage
Startuporaftermeasurement,press buttontolockcurrent
displayeddata,showing , iconandautomaticallystorewithserial
numbers.If storageisfull,theTesterwilldisplay icon.Eachgroupof
storeddataincludesmaximum, minimumand averagevalue.Andthenpress
buttontoremovelock.
Asshownintheleft figurebelow: thelock measurementdatais5.1Ω,as
the19thgroupofdatastorage.
11 DataReading/Deletion
Startuporaftermeasurement,press buttonforalongertime(over
-14-
3seconds)toenterdatareading,press or buttontoselectreading
datagroupnumberbystepvalue1,press or button constantlyto
select readingdatagroupnumberbystepvalue10,press buttontoread
themaximum,minimumandaveragevalueofthisgroup ofdata,andthen
press button toexitfromreading.
Onreadingifthereisnostoragedata,LCDwill display “----”,see the
aboveright figure.
Underdatareading status,press button toenterdatadeletion,press
or toselect “no”or “YES”,selecting “no”and thenpressing “MEM”
buttonfornotdeletingreturndatareadingstatus,selecting “YES”andthen
pressing “MEM”buttonfordeletingstoreddataanditwillshowasaboveright
figureafterdeletion.
12 DataUpload
Makegood connectionofcompanywithRS232communication wireof
theTester,switchon theTesterandrun monitoringsoftware,andifthe
softwaredisplaysthatinterfaceisopenandtheconnectionissuccessful,
thenitcan read thestoredhistoricaldata,uploadtocompanyand preserve.
Monitoring software hasthefunction ofonlinereal-timemonitoring
and historicalinquiry,dynamicdisplay,withthemaximum,minimum,and
averagevalueindication, withalarmvaluesettingsand alarmindicator,and
thefunctionofhistoricaldataaccess,reading,preserve,printand other
functions.
VIII. BatteryReplacement
Pleasedontreplacebatteryinflammablespot
Pleasedontreplacebatteryduringmeasurement
Payattentiontobatterypolarityand specification,and dont
mixuseofnewandusedbatterytoavoiddamageonTester
When theenclosureofTesteriswet, pleasedo notopen
batterycover
Pleaseputtheusedbatteriesinappointedcollection place.
1. Switchoff; making surethat theTesterisunderswitch-off state.
2. Loosen thefourscrewsonbatterycoveratthebottomof the Tester, and
openbatterycover.
3.Replacenewbattery,payattentiontobatterypolarityandspecification,
closebatterycover,andfastenscrew.
4. Switchon verification, otherwisere-operate.
-15-
IX Accessories
Tester 1PC
TesterBag 1 PC
AuxiliaryEarthingRod 2 PCS
MonitoringSoftwareDisk 1Copy
RS232 CommunicationCable 1PC
TestingWire 3PCS
Simpletestingwire 2PCS
Zinc-manganesedrybattery 6PCS（R14S1.5V）
Manual/Warrantycard/Qualification
Certificate 1Copy
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