KYORITSU KEW 4106 User manual

InstructionManual
EarthResistance/EarthResistivityTester
KEW 4106

Contents
1.SafetyWarnings...............................................................................................1
2.HowtostoretheCover....................................................................................5
 2-1MethodofremovingtheCover...............................................................5
 2-2MethodofstoringtheCover...................................................................5
3. Features.............................................................................................................6
4. Specifications...................................................................................................7
5. InstrumentLayout.......................................................................................... 10
6. MarksandmessagesontheLCD.............................................................. 13
7. MeasurementPrinciple................................................................................. 14
 7-1PrincipleofEarthResistanceMeasurements................................... 14
 7-2PrincipleofEarthResistivity(ρ)Measurements.............................. 14
8. PreparationforMeasurement....................................................................... 15
 8-1BatteryVoltageCheck........................................................................... 15
 8-2Settings................................................................................................... 15
 8-2-1SettingItems................................................................................... 15
 8-2-2SettingforMeasurementMethod................................................ 16
 8-2-3SettingforMeasurementFrequency............................................ 16
 8-2-4Site(location)No.Setting............................................................ 17
 8-2-5SettingfortheintervalbetweenAuxiliaryEarthSpikes
 atEarthResistivity(ρ)Measurements....................................... 18
 8-2-6DateandTimeSetting.................................................................... 18
 8-2-7Settingfortheresidualresistance(Rk)ontheTestLeads..... 21
 8-3Backlight................................................................................................. 22
 8-4Auto-Power-Off....................................................................................... 22
 8-5SeriesInterferenceVoltage(EarthVoltage)Measurement............. 23
 8-6AuxiliaryEarthResistanceMeasurement.......................................... 23
 8-7ConnectionofEarthTestLeadsandSimplified
 MeasurementProbes............................................................................. 23

9. MeasurementMethod................................................................................... 24
 9-1EarthResistanceMeasurement........................................................... 24
 9-1-1PreciseMeasurement(3-Wire)..................................................... 25
 9-1-2PreciseMeasurement(4-Wire)..................................................... 27
 9-1-3SimplifiedMeasurement(2-Wire)................................................ 29
 9-2EarthResistivity(ρ)Measurement.................................................... 31
10.Save/RecalltheMeasurementResults.................................................... 34
 10-1Howtosavethedata......................................................................... 34
 10-2Howtorecallthesaveddata............................................................ 35
 10-3Howtodeletethesaveddata........................................................... 35
 10-3-1Deletethedataonebyone........................................................ 35
 10-3-2Deletethewholedataone-time................................................ 36
 10-4HowtotransferthestoreddatatoaPC......................................... 37
11.BatteryandFuseReplacement................................................................... 38
 11-1BatteryReplacement.......................................................................... 38
 11-2FuseReplacement.............................................................................. 38
12.CaseandShoulderstrapAssembly........................................................... 40
13.BeforeSendingforService.......................................................................... 41

1
1.SafetyWarnings
This instrument has been designed, manufactured and tested according to
IEC 61010: Safety requirements for Electronic Measuring apparatus, and
deliveredinthebestconditionafterpassingqualitycontroltests.
This instruction manual contains warnings and safety rules which have to
be observed by the user to ensure safe operation of the instrument and
to maintain it in safe condition. Therefore, read through these operating
instructionsbeforeusingtheinstrument.
#WARNING
●Readthroughandunderstandtheinstructionscontainedinthismanual
beforeusingtheinstrument.
●Keep the manual at hand to enable quick reference whenever
necessary.
●Theinstrumentistobeusedonlyinitsintendedapplications.
●Understand and follow all the safety instructions contained in the
manual.
Itisessentialthattheaboveinstructionsareadheredto.Failuretofollow
theaboveinstructions maycause injury,instrument damage and/or
damagetoequipmentundertest.
○The symbol #indicated on the instrument, means that the user
must refer to the related parts in the manual for safe operation of the
instrument.
○Readtheinstructionsfollowingcarefullyeach#symbolinthemanual.
#DANGER:is reserved for conditions and actions that are likely to
causeseriousorfatalinjury.
#WARNING:is reserved for conditions and actions that can cause
seriousorfatalinjury.
#CAUTION:isreservedforconditionsandactionsthatcancause
injuryorinstrumentdamage.

2
#DANGER
●Never make measurement on a circuit in which electrical potentials
exceedingAC/DC300Vexist.
●Do not attempt to make measurement in the presence of flammable
gasses. Otherwise, the use of the instrument may cause sparking,
whichcanleadtoanexplosion.
●Neverattemptto usethe instrumentif itssurface oryour handare
wet.
●Becarefulnottoshort-circuitthepowerlinewiththemetalpartofthe
testleadswhenmeasuringavoltage.Itmaycausepersonalinjury.
●Donotexceedthemaximumallowableinputofanymeasuringrange.
●DonotpresstheTestButtonbeforeconnectingtheTestLeads.
●NeveropentheBatterycoverduringameasurement.
#WARNING
●Never attempt to make any measurement if any abnormal conditions,
such as a broken cover or exposed metal parts are present on the
InstrumentandTestLeads.
●DonotrotatetheRangeSwitchwiththeTestLeadsconnectedtothe
equipmentundertest.
●Donotinstallsubstitutepartsormakeanymodificationtothe
instrument.
Returntheinstrument toyourlocalKEW distributor forrepairor
re-calibrationincaseofsuspectedfaultyoperation.
●Donotreplacebatteriesiftheinstrumentiswet.
●Ensurethatthetestleadsarefirmlyinsertedintotheterminal.
●SettheRangeswitchtoOFFpositionwhenopeningtheBatterycover
forbatteryreplacement.

3
#CAUTION
●Set and check the Range switch to the appropriate position before
makingmeasurement.
●Set the Range switch toOFF position after use and remove the
test leads. The instrument consume small current at any range other
thanOFF,anditshortensthebatterylife.Removethebatteriesifthe
instrumentistobestoredandwillnotbeinuseforalongperiod.
●Do not expose the instrument to direct sunlight, high temperatures,
humidityordew.
●Useadampclothwithneutraldetergentforcleaningtheinstrument.
Donotuseabrasivesorsolvents.
●Donotstoretheinstrumentifitiswet.Storeitafteritdries.
●Usetheinstrumentinfollowingenvironmentalconditionssoasnotto
impairthesafetyoftheinstrument.
*Temperature:-10ºC˜50ºC,Altitude:2000morless

4
Symbols
CAT.IV
The circuit from the service drop to the service entrance, and
to the power meter and primary overcurrent protection device
(distributionpanel)
CAT.III
Primaryelectrical circuits of theequipment connected directly to
the distribution panel, and feeders from the distribution panel to
outlets.
Instrumentwithdoubleorreinforcedinsulation
#Usermustrefertotheexplanationsintheinstructionmanual.
This instrument meets CAT.III300V/ CAT.IV150V.To ensure safe
operationofmeasuringinstruments,IEC61010establishessafetystandards
for various electrical environments, categorized as CAT.II to CAT.IV, and
called measurement categories. Higher-numbered categories correspond
to electrical environments with greater momentary energy, so a measuring
instrumentdesignedforCAT.IIIenvironmentscanenduregreatermomentary
energythanonedesignedforCAT.II.
O :Circuits which are not directly connected to the mains power
supply.
CAT.II :Primary electrical circuits of equipment connected to an AC
electricaloutletbyapowercord.
CAT.III :Seeabovetable.
CAT.IV :Seeabovetable.

5
2.HowtostoretheCover
This instrument has a dedicated Cover to protect against impacts from
theoutsideandpreventtheinstrumentbodyfrombecomingdirty.The
Cover can be detached and put on the backside of the main body during
measurements.
2-1MethodofremovingtheCover
Slideand pulltheCover in
thedirectionofanarrow.
2-2MethodofstoringtheCover
Turn the Cover, slide and
push it in thedirectionof
arrow.
fig.1
fig.2

6
3.Features
KEW4106 is a 2/ 3/ 4-Wire Digital Earth Resistance/ Earth Resistivity
Tester equipped with a microcomputer and can measure earth resistances
and calculate earth resistivities (ρ). This instrument can measure earth
resistancesonpowerdistributionlines,in-housewiringsystemandelectrical
appliancesetc.duetothelowoutputvoltage:approx10Vrmsorless.
●Designedtomeetfollowingsafetystandards.
IEC 61010-1, IEC61010-2-030 (CAT.III 300V, CAT.IV 150V, Pollution
degree2)
IEC61010-031（Requirementsforhand-heldProbes）
IEC61557-1,5(EarthResistanceTester)
●Stablemeasurementresults canbe obtainedunder anoisy environment
byintroducingtheFFT(FastFourierTransform)technology.
●Dot-matrix192x64,MonochromeLCD
●Backlightfunctiontoviewthetestresultsindimlyareas
●Canswitchfrequenciesofmeasuringsignal
4-kindoffrequencies:94/105/111/128Hz,areselectablebyhand
orautomatically.
●Rk Function is available to cancel the residual resistance on the Test
Leads.
●BatteryCheckFunction
●CanmeasureSeriesInterferenceVoltage/Frequency
VoltagevaluesandfrequenciesaredisplayedwhenSeries
Interferencevoltage(AC)exist.
●AuxiliaryEarthResistanceMeasurementFunction
Auxiliaryearthresistancesaremeasuredanddisplayed.
●WarningforAuxiliaryEarthResistanceMeasurements
WarningsaredisplayedontheLCDwhenauxiliaryearthresistancesare
toohighandmayresultininaccuratemeasurements.
●Auto-Power-OffFunction
Theinstrumentisautomaticallypoweredoffwhen5minpasseswithout
anyKeyoperation.
●MemoryFunction
Cansave800measuredresults.
●CommunicationInterface
Can transfer the saved data in the instrument to a PC via a supplied
OpticalAdaptor.