INSTRUCTION MANUAL

DIGITAL LOOP/PFC/PSC TESTER

ＫＥＷ 4140

CONTENTS

1. Safe Testing ･･･････････････････････････････････････････12. Instruments Layout ･･････････････････････････････････････43. Accessories ････････････････････････････････････････････74. Features ･･･････････････････････････････････････････････85. Specification･ ･･････････････････････････････････････････9 5.1 Measurement Specification ･･････････････････････････9 5.2 Operating Error ････････････････････････････････････10 5.3 General Specification ･･････････････････････････････11 5.4 Applied Standards ･････････････････････････････････116. Preparation for Measurement ････････････････････････････127. LOOP/PSC/PFC Test ･････････････････････････････････13 7.1 Principles of Measurement of Fault Loop Impedance and PFC ･13 7.2 Principles of Measurement of Line Impedance and PSC ･17 7.3 Operating Instructions for LOOP and PSC/PFC ･･･････18 7.3.1 Initial Checks･ ･･･････････････････････････････････18 7.3.2 Measurement Of LOOP And PSC/PFC ･････････････19 7.3.3 Contents on Sub Display ･･････････････････････････208. Phase Rotation Test ･･･････････････････････････････････239. Volts ･････････････････････････････････････････････････2410. Back Light ･･･････････････････････････････････････････2411. Auto-Test ････････････････････････････････････････････2412. Battery Replacement ･･････････････････････････････････2513. Servicing ････････････････････････････････････････････2614. Case and Strap Assembly ･････････････････････････････27

The KEW4140 incorporates Anti Trip Technology (ATT) which electronically bypasses RCDs when performing loop impedance tests. This saves time and money by not having to take the RCD out of the circuit during testing and is a safer procedure to follow.With the ATT function enabled, a test of 15mA or less is applied between line & earth.It enables loop impedance measurements without tripping RCDs rated at 30mA and above.Please read this instruction manual carefully before using this equipment.

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1. Safe Testing

# WARNINGRead through and understand instructions contained in thismanualbeforestartingusingtheinstrument.

Save and keep themanual handy to enable quick referencewhenevernecessary.

Theinstrumentistobeusedonlyinitsintendedapplications.Understandandfollowallthesafetyinstructionscontainedinthemanual.

Failure to follow the instructionsmay cause injury, instrumentdamageand/or damage to equipment under test.Kyoritsu is bynomeans liable foranydamageresulting from the instrument incontradictiontothiscautionarynote.The symbol# indicatedon the instrumentmeans that theusermustrefertotherelatedsectionsinthemanualforsafeoperationoftheinstrument.Besuretocarefullyreadinstructionsfollowingeachsymbol#inthismanual.

# DANGER isreservedforconditionsandactionsthatarelikelytocauseseriousorfatalinjury.# WARNING is reserved for conditionsandactions that cancauseseriousorfatalinjury.# CAUTION is reserved for conditions andactions that cancauseaminorinjuryorinstrumentdamage.

# DANGERThis instrument is designed to work in distribution systemswherethelinetoearthhasamaximumvoltageof300V50/60Hzandforsomerangeswherelineto linehasamaximumvoltageof500V50/60Hz.

Besuretouseitwithinthisratedvoltage.When conducting tests do not touch any exposedmetalworkassociatedwith the installation. Suchmetalworkmay becomeliveforthedurationofthetest.

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For safety reasons only use accessories (test leads, probes,cases, etc) designed to be used with this instrument andrecommendedbyKYORITSU.The use of other accessories isprohibitedastheyareunlikelytohavethecorrectsafetyfeatures.

Never open the battery compartment cover when makingmeasurement.

The instrumentshouldbeusedonly in its intendedapplicationsor conditions.Otherwise, safety functions equippedwith theinstrument do not work, and instrument damage or seriouspersonalinjurymaybecaused.

Keepyour fingersandhandsbehind theprotective fingerguardduringmeasurement.

# WARNINGNeverattempt tomakeanymeasurement, if the instrumenthasany structural abnormality suchas cracked caseandexposedmetalpart.

If theoverheatsymbol appears in thedisplaydisconnect theinstrumentfromthemainssupplyandallowtocooldown.

Donot install substitute parts ormakeanymodification to theinstrument.Return the instrument toKyoritsuor your distributorforrepairorre-calibration.

Stopusing the test lead if theouter jacket isdamagedand theinnermetalorcolorjacketisexposed.

Donottrytoreplacethebatteryifthesurfaceoftheinstrumentiswet.EnsurethattheTestLeadisdisconnectedfromtheobjectundertest, and that the instrument is poweredoffwhenopening thebatterycompartmentcoverforbatteryorfusereplacement.

# CAUTIONDo not expose the instrument to the direct sun, extremetemperaturesordewfall.

Besuretosetthefunctionselectorswitchtothe“OFF"positionafter use.When the instrumentwill not be in use for a longperiodoftime,placeitinstorageafterremovingthebattery.

Alwaysmakesuretoinserteachplugofthetestleadsfullyintotheappropriateterminalontheinstrument.

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Measurementcategories(Over-voltagecategories)To ensure safe operation ofmeasuring instruments, IEC 61010establishes safety standards for various electrical environments,categorizedasOtoCATIV,andcalledmeasurementcategories.Higher-numbered categories correspond to electrical environmentswith greater momentary energy, so a measuring instrumentdesigned forCAT III environments canenduregreatermomentaryenergythanonedesignedforCATII.O :Circuitswhich are not directly connected to themains

powersupply.CATII :Primaryelectrical circuits of equipment connected to an

ACelectricaloutletbyapowercord.CATIII :Primary electrical circuits of the equipment connected

directly to the distribution panel, and feeders from thedistributionpaneltooutlets.

CATIV :Thecircuitfromtheservicedroptotheserviceentrance,and to the power meter and primary overcurrentprotectiondevice(distributionpanel).

O: Device which is not directly connected to the mains power supply

During testing it is possible that theremaybeamomentarydegradationof the readingdue to thepresenceof excessivetransients or dischargeson theelectrical systemunder test.Should thisbeobserved, the testmustberepeated toobtainacorrectreading.Ifindoubt,contactyourdistributor.

Useadampclothanddetergentforcleaningtheinstrument.Donotuseabrasivesorsolvents.

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2. Instrument Layout 1.FrontView

Fig.2-1

Name Operation

① Display(LCD) --

② TestSwitch Startmeasurements.

③ BackLightSwitch Switcheson/off theBack light oftheDisplay(LCD)

④ L-PEATTONSwitch Select“L-PEATTON”function

⑤ L-PEATTOFFSwitch Select“L-PEATTOFF”function

⑥ L-N/L-LSwitch Select“L-N/L-L”Function

⑦ DISPSwitch Change the contents on SubDisplay

⑧ VOLTS/FREQUENCYSwitch Select"VOLTS/FREQUENCY" function

⑨ PHASEROTATIONSwitch Select"PHASEROTATION"function

⑩ PowerSwitch PowerSwitch(Pressdownforatleast1sec.)

④ ⑥⑤

①

②

③

⑦⑧⑨⑩

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2.InputTerminal

Fig.2-2

① TerminalNamesfor:LOOP,VOLTS

L:Line

PE:ProtectiveEarth

N:Neutral(forLOOP)

② TerminalNamefor L1:Line1

PHASEROTATION L2:Line2

L3:Line3

3.LCD

Fig.2-3

②

①

Sub Display

Main Display

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List of Display MessageBatterysymbolDisplayedwhen themeasured values exceed thedisplayablerange.(over-range)e.g.Thedisplayshows“>1999Ω”ataLOOPtestwhenatestresultexceeds1999Ω.Displayedwhen“L-PEATTON” function isselected toindicateATTison.TheLCD indicates “L-PE”when “L-PEATTON”or“ATTOFF” isselectedand“L-N/L-L”when“L-N/L-L” isselected.IndicatingwhatthevaluesdisplayedontheSubDisplay.Temperaturemonitor for internal resistance,availableatLoop,PSC/PFCfunction.Furthermeasurementsaresuspendeduntilthe“ ”symboldisappears.Measuringsymbol(LOOPfunction)

L-N>20Ω Alert:Presenceof20ΩormorebetweenLine‐NeutralatATTONmeasurementCaution :Presenceofnoise in thecircuit under testduringATTmeasurement.ATT function should bedisabledtocontinuemeasurements.

nEHvCaution:PresenceofhighvoltagebetweenNEUTRAL-EARTHduringATTmeasurement.ATTfunctionshouldbedisabledtocontinuemeasurements.WiringcheckforLOOPfunction

DisplayedatPHASEROTATIONcheckCorrectphasesequence:displayed mark.Reversedphasesequence:displayed mark.

no

PHASEROTATION

Appears to indicatewrongconnectionatPhaseRotationcheck.

LOOP Whenon theLOOP function, supplymayhavebeeninterrupted.

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3. Accessories 1.MainTestLead(Model7218)

Fig.3-1

2.DistributionBoardTestLead(Model7246)

Fig.3-2

ProtectivefingerguardIt is a part providing protection against electrical shock andensuringtheminimumrequiredairandcreepagedistances.Whentheinstrumentandthetestleadarecombinedandusedtogether,whicheverlowercategoryeitherofthembelongstowillbeapplied.

3.SoftCaseModel9156A…x14.StrapBeltModel9155……x15.Battery…x6

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4. Features TheKEW4140LOOP/PFC/PSC tester performs three function inoneinstrument.1Loopimpedancetester2Voltagetester3Phaserotationtester

TheKEW4140havethefollowingfeatures:ATT(AntiTripTechnology) ATTenablesameasurementwithout

tripping the RCDswith the ratedresidualcurrentof30mAormore.

Wiringcheck ThreeWiring symbols indicate ifthewiringof the circuit under test iscorrect.

Overtemperatureprotection Detects overheatingof the internalresistor displayingawarning symbol( ) andautomatically halting furthermeasurements.

Autopoweroff Automaticallyswitchestheinstrumentoffafteraperiodofapproximately10minutes.TheAutopoweroffmodecanonlybecancelledbyswitchingtheinstrumentonagain.

BackLight Powered off automaticallywhen 2minpassafterthelastoperation.

SUBDisplay PFC,PSCandL-NLOOPresistancevaluesarealsomeasuredat LOOPL-PE test anddisplayedon theSubDisplay.

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5. Specification 5.1 Measurement SpecificationLoopImpedance

Function(OperatingVoltage)

RatedVoltageRange

(Auto-Ranging)

NominalTestCurrentat0ΩExternalLoop:Magnitude/Duration

(＊1)AccuracyGuaranteedVoltage

Range

L-PE

ATTOFF(100～280Ｖ)(45～65Hz)

230V(50／60Hz) L-PELOOP:20Ω:0.00-19.99Ω200Ω:20.0-199.9Ω2000Ω:200-1999ΩPFC/PSC:2000A：0-1999A20kA：2.00-19.99kA

L-PE:20Ω:6A/20ms200Ω:2.3A/20ms2000Ω:15mA/250msL-N:6A/20ms

±(3%rdg+4dgt)(＊2)

230V(+10%/-15%)(50/60Hz)±1%

ATTON(100～280Ｖ)(45～65Hz)

230V(50／60Hz) L-PELOOP:20Ω:0.00-19.99Ω200Ω:20.0-199.9Ω2000Ω:200-1999ΩPFC/PSC:2000A：0-1999A20kA：2.00-19.99kA(L-N<20Ω)

L-N:6A/60msN-PE:10mA/approx.5s

±(3%rdg+6dgt)(＊2)230V(+10%/-15%)

(50/60Hz)±1%

L-N/L-L(100～500Ｖ)(45～65Hz)

L-N：230V(50/60Hz)L-L：400V(50/60Hz) L-N/L-LLOOP:

20Ω:0.00-19.99ΩPSC:2000A：0-1999A20kA：2.00-19.99kA

20Ω:6A/20ms

L-N：±(3%rdg+4dgt)L-L：±(3%rdg+8dgt)

(＊3)

L-N：230V(+10%／-15%)L-L：400V(+10%／-15%)(50／60Hz)±1%

＊1:at230V＊2:Accuracy of L-N LOOP displayed on theSubDisplay is

synchronizedwiththeoneatL-N/L-Lfunction.　　PSC/PFCAccuracyisderivedfrommeasuredloopimpedance

specificationandmeasuredvoltagespecification.＊3:PSCAccuracy is derived frommeasured loop impedance

specificationandmeasuredvoltagespecification.

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PHASEROTATIONRatedVoltage Remarks

50～500V45~65Hz

Correctphasesequence:displayed“1.2.3”and markReversedphasesequence:displayed“3.2.1”and mark

Volts

Range Display Range Guaranteed Voltage Range Accuracy

500V Volt：0 ～ 525VFrequency：40.0 ～ 70.0Hz

25 ～ 500Vrms45 ～ 65Hz

Volt：±(2%rdg+4dgt)Frequency：±(0.5%rdg+2dgt)

Possiblenumberoftestswithfreshalkalinebatteries.LOOP/PFC/PSC :Approx.3000timesmin(ATT)VOLT/PHASEROTATION :Approx.100H.

5.2 Operating errorLoopImpedance(EN61557-3)

FUNCTION OperatingrangecompliantwithEN61557-3operatingerror

Maximumpercentageoperatingerror

L-PE 0.40~1999Ω±30%

L-N/L-L 0.40~19.99Ω

The influencing variationsused for calculating theoperatingerroraredenotedasfollows;Temperature :0and35Phaseangle :Ataphaseangle0°to18°Systemfrequency :49.5Hzto50.5HzSystemvoltage :230V+10%-15%Supplyvoltage :6.8Vto10.35VHarmonics :5%of3rdharmonicat0°phaseangle　 5%of5thharmonicat180°phaseangle　 5%of7thharmonicat0°phaseangleD.Cquantity :0.5%ofthenominalvoltage

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5.3 General specificationInstrument dimensions 84X184X133mmInstrument weight:- 860g(includingbatteries.)Reference conditions Specificationsarebasedon the following

conditionsexceptwhereotherwisestated:-1.Ambienttemperature:23±5°C:2.Relativehumidity45%to75%3.Position:horizontal4.ACpowersource230V,50Hz5.DCpowersource:9.0V6.Altitudeupto2000m,Indooruse

Battery type Six1.5VAAbatteriesUse o f a l k a l i n e b a t t e r i e s ( LR6 ) i srecommended.

Operating temperatureand humidity.

-10to+50°C,relativehumidity85%or less,nocondensation

Storage temperature and humidity

-20to+60°C,relativehumidity75%or less,nocondensation

5.4 Applied standardsInstrumentoperating IEC/EN61557-1,3,7,10StandardSafetystandard IEC/EN61010-1,61010-2-030

CATIII(300V)-InstrumentIEC/EN61010-031CATII(250V)-TestLeadModel7218CATIII(600V)-TestLead7246

Protectiondegree IEC60529IP54EMC EN61326-1RoHS EN50581Thismanual andproductmayuse the following symbols adoptedfromInternationalSafetyStandards;

Equ ipment p ro tec ted th roughou t by DOUBLEINSULATIONorREINFORCEDINSULATION;

# Caution(refertoaccompanyingdocuments) EarthGround

This instrument satisfies themarking requirementdefined in theWEEEDirective (2002/96/EC).Thissymbol indicates separate collection for electrical andelectronicequipment.

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6. Preparation for Measurement CheckofBatteryvoltage(1)See“12.Batteryreplacement”andinstallbatteriesinKEW4140.(2)PressthePowerswitchonKEW4140foratleast1sectopower

ontheinstrument.*Powerswitchisactivatedonlywhentheswitchispressedfor1

secormore.Presstheswitchforatleast1sectopowerofftheinstrument.(3)Power onKEW4140and check theBattery symbol displayed

at theupper left on theLCD.When thedisplayedbattery levelis lowest ( ), the installedbatterieswill beexhausted soon.Replacethebatterieswithreferenceto“12.Batteryreplacement”tocontinuefurthertests.

When the Battery symbol is empty ( ), battery level islower than the lower limit of theworking voltage. In this case,accuraciesofthemeasuredvaluesaren’t assured.Replace thebatterieswithnewones.

The empty Battery symbol ( ) is displayed andwarningbuzzersounds for2secwhenpoweringon the instrumentwithexhaustedbatteries.

BatteriestobeusedUseofalkalinebatteries is recommended.Battery levelmaynotberecognizedproperlywhenalkalinebatteriesaren’tused.

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7. LOOP/ PSC/PFC Test 7.1 Principles of measurement of fault loop impedance and PFCIf anelectrical installation is protectedbyover-current protectivedevices including circuit breakers or fuses, the earth loopimpedanceshouldbemeasured.In theevent of a fault theearth fault loop impedance shouldbelowenough (and theprospective fault current highenough) toallowautomaticdisconnectionoftheelectricalsupplybythecircuitprotectiondevicewithin a prescribed time interval.Every circuitmustbetestedtoensurethattheearthfaultloopimpedancevaluedoesnot exceed that specifiedor appropriate for theover-currentprotectivedevice installed in the circuit.TheKEW4140 takesacurrent from thesupplyandmeasures thedifferencebetween theunloadedand loaded supply voltages.From this difference it ispossibletocalculatetheloopresistance.TT SystemForaTTsystemtheearth fault loop impedance is thesumof thefollowingimpedances;Impedanceofthepowertransformersecondarywinding.Impedanceof thephase conductor resistance from thepowertransformertothelocationofthefault.

Theimpedanceoftheprotectiveconductorfromthefaultlocationtotheearthsystem.

Resistanceofthelocalearthsystem(R).Resistanceofthepowertransformerearthsystem(Ro).Thefigurebelowshows(dotted line) theFault loop impedanceforTTsystems.

Fig.7-1

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AccordingtotheInternationalStandardIEC60364,forTTsystemsthecharacteristicsoftheprotectivedeviceandthecircuitresistanceshallfulfillthefollowingrequirements:

Ra x Ia ≤ 50V Where:RaisthesumoftheresistancesinΩofthelocalearthsystemandtheprotectiveconductorfortheexposedconductiveparts.50 is themaximumsafety touch voltage limit (it canbe25V inparticularcaseslikeconstructionsites,agriculturalpremises,etc.).Ia is the current causing the automatic disconnection of theprotectivedevicewithinthemaximumdisconnectingtimesrequiredbyIEC60364-41:　-200msforfinalcircuitsnotexceeding32A(at230/400VAC)　-1000ms fordistributioncircuitsandcircuitsover32A (at230 /

400VAC)Thecompliancewiththeaboverulesshallbeverifiedby:1)Measurementof the resistanceRaof the localearthsystembyLooptesterorEarthtester.

2)Verificationof thecharacteristicsand/or theeffectivenessof theRCDassociatedprotectivedevice.

Generally inTTsystems,RCDsshall beusedasprotectivedeviceand in thiscase, Ia is theratedresidualoperatingcurrent In.ForinstanceinaTTsystemprotectedbyaRCDthemaxRavaluesare:RatedresidualoperatingcurrentIn 30 100 300 500 1000 (mA)RA(withtouchvoltageof50V) 1667 500 167 100 50 (Ω)RA(withtouchvoltageof25V) 833 250 83 50 25 (Ω)Shownbelow isapractical exampleof verificationof theprotectionbyRCDinaTTsystemaccordingtotheinternationalStandardIEC60364.

Fig7-2

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Forthisexamplethemaxpermissiblevalueis1667Ω(RCD=30mAandcontactvoltage limitof50V).The instruments reads12.74Ω,thus the conditionRA≤50/Ia is respected.However, consideringthat theRCD isessential forprotection, itmustbe tested (PleaserefertoRCDTESTSsection).TN SystemForTNsystems theearth fault loop impedance is the sumof thefollowingimpedances.Impedanceofthepowertransformersecondarywinding.Impedanceofthephaseconductorfromthepowertransformertothelocationofthefault.

Impedanceof theprotectiveconductor from the fault location tothepowertransformer.

Thefigurebelowshows(dotted line) theFault loop impedanceforTNsystems.

Fig.7-3

According to the International Standard IEC 60364, for TNsystem the characteristics of theprotectivedeviceand the circuitimpedanceshallfulfillthefollowingrequirement: Zs x Ia ≤ Uo Where:ZsistheFaultloopimpedanceinohm.Uo is thenominalvoltagebetweenphase toearth (typically230VACforbothsinglephaseandthreephasecircuits).Ia is the current causing the automatic disconnection of theprotectivedevicewithinThemaximumdisconnectingtimesrequiredbyIEC60364-41thatare:

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　-400msforfinalcircuitsnotexceeding32A(at230/400VAC)　-5sfordistributioncircuitsandcircuitsover32A(at230/400VAC)

Thecompliancewiththeaboverulesshallbeverifiedby:1)MeasurementofthefaultloopimpedanceZsbyLooptester.2)Verificationof thecharacteristicsand/or theeffectivenessof theassociatedprotectivedevice.Thisverificationshallbemade:

-forcircuit-breakersandfuses,byvisualinspection(i.e.shorttimeorinstantaneoustrippingsettingforcircuit-breakers,currentratingandtypeforfuses);

-forRCDs, by visual inspection and test usingRCD testersrecommendingthatthedisconnectingtimesmentionedabovearemet(PleaseseeRCDTESTsection).

ForinstanceinaTNsystemwithnominalmainsvoltageUo=230VprotectedbyGeneral purposegG fusesorMCBs (MiniatureCurrentBreakers)requiredbyIEC898/EN60898,theIaandmaxZsvaluescouldbe:

ProtectionbygGfuseswithUoof230V

ProtectionbyMCBswithUoof230V(Disconnectiontime0.4and5s)

Rating(A)

Disconnectiontime5s

Disconnectiontime0.4s

CharacteristicB

CharacteristicC

CharacteristicD

la(A) Zs(Ω) la(A) Zs(Ω) la(A) Zs(Ω) la(A) Zs(Ω) la(A) Zs(Ω)6 17 13.5 38 8.52 30 7.67 60 3.83 120 1.9210 31 7.42 45 5.11 50 4.6 100 2.3 200 1.1516 55 4.18 85 2.7 80 2.87 160 1.44 320 0.7220 79 2.91 130 1.77 100 2.3 200 1.15 400 0.5725 100 2.3 160 1.44 125 1.84 250 0.92 500 0.4632 125 1.84 221 1.04 160 1.44 320 0.72 640 0.3640 170 1.35 -- -- 200 1.15 400 0.57 800 0.2950 221 1.04 -- -- 250 0.92 500 0.46 1000 0.2363 280 0.82 -- -- 315 0.73 630 0.36 1260 0.1880 403 0.57 -- --100 548 0.42 -- --

Themost complete loop testers orMultifunction testers alsohave theProspectiveFault currentmeasurement. In this case,ProspectiveFault currentmeasuredwith Instrumentsmust behigherthanthetabulatedIaoftheprotectivedeviceconcerned.

BelowisapracticalexampleofverificationoftheprotectionbyMCBinaTNsystemaccordingtotheinternationalStandardIEC60364.

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Fig.7-4

MaxvalueofZsforthisexampleis1.44Ω(MCB16A,characteristicC),theInstrumentreads1.14Ω(or202AonFaultcurrentrange)itmeansthattheConditionZsxIa≤Uoisrespected.InfacttheZsof1.14Ωislessthan1.44Ω(ortheFaultcurrentof202AismorethanIaof160A).Inotherwords, incaseof faultbetweenphaseandearth, thewallsocket tested inThis example is protectedbecause theMCBwilltripwithinthedisconnectiontimerequired.

7.2 Principles of the measurement of line impedance and PSCThemethod formeasuringLine–neutral impedanceand line-lineimpedance is exactly the sameas for earth fault loop impedancemeasurementwith theexception that themeasurement is carriedoutbetweenlineandneutralorlineandline.

Prospective short circuit or fault current at anypointwithin anelectricalinstallationisthecurrentthatwouldflowinthecircuitifnocircuit protectionoperatedanda complete (very low impedance)shortcircuitoccurred.Thevalueof this faultcurrent isdeterminedbythesupplyvoltageandthe impedanceof thepathtakenbythefaultcurrent.Measurementofprospectiveshortcircuitcurrentcanbeusedtocheckthattheprotectivedeviceswithinthesystemwilloperatewithinsafetylimitsandinaccordancewiththesafedesignof the installation.Thebreaking current capacity of any installedprotectivedevice shouldbealwayshigher than theprospectiveshortcircuitcurrent.

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　　　　　　Fig.7-57.3. Operating instructions for LOOP and PSC/PFC7.3.1 Initial Checks: to be carried out before any testing1. PreparationAlways inspect your test instrument and leadaccessories forabnormality or damage: If abnormal conditionsexistDONOTPROCEEDWITHTESTING.Have the instrument checkedbyyourdistributor.

(1)OperatethePowerswitchandturnontheinstrument.(PressthePowerswitchforatleast1sec.)

Pressanyofthefollowingswitchestoselectafunction.・ L-PEATTON:forLine–Earthloopimpedancetests(withATTon)・L-PEATTOFF:forLine–Earthloopimpedancetests・L-N/L-L:forline-neutralorline–lineloopimpedancetestsATTenablesameasurementwithout tripping theRCDswith theratedresidualcurrentof30mAormore.

(2)InserttheTestLeadintotheinstrument.(Fig.7-6)

Fig.7-6

2. Wiring CheckAftertheconnection,ensurethatthesymbolsforWiringcheckontheLCDareinthestatusindicatedinFig.7-6beforepressingthetestswitch.

If the statusof the symbols forWiring checkdiffer fromFig.7-6

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or symbol is indicated on the LCD,DONOTPROCEEDASTHEREISINCORRECTWIRING.Thecauseofthefaultmustbeinvestigatedandrectified.

3. Voltage MeasurementWhen the instrument is first connected to the system, itwilldisplay the line-earthVoltage (L-PEATTON /ATTOFF)or line-neutralvoltage(L-N/L-L)whichisupdatedevery1s.Ifthisvoltageisnotnormalorasexpected,DONOTPROCEED.

7.3.2 Measurement of LOOP and PSC/PFCa. Measurement at Mains Socket OutletConnectthemainstestleadtotheinstrument.Insertthemouldedplugofmainstestleadintothesockettobetested.(seeFig.7-8)

Carry out the initial checksPressthetestswitch.AbeepwillsoundasthetestisconductedandthevalueofLoopimpedancewillbedisplayed.

b. Measurement at the distribution boardConnectthedistributionboardleadModel7246totheinstrument. b-1.Measurement of Line – Earth Loop Impedance and PFCConnectthegreenPEleadoftheModel7246totheearth,the

blueNleadtotheneutralofthedistributionboardandtheredLleadtoone‘line’ofthedistributionboard.(SeeFig.7-9)

b-2.Measurement of Line – Neutral Loop Impedance and PSCConnect theblueN leadof theModel 7246 to theneutral

of thedistributionboard, the redL lead to one lineof thedistributionboard.(SeeFig.7-10)

b-3.Measurement of Line – Line Loop Impedance and PSCConnect theblueN leadof theModel 7246 to the lineof

thedistributionboard, the redL lead to another lineof thedistributionboard.(SeeFig.7-11)

Carry out the initial checksPressthetestswitch.Abeepwillsoundasthetestisconductedand the value of loop impedancewill be displayed.Whendisconnecting from thedistributionboard, it is goodpractice todisconnectthelinefirst.

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7.3.3 Contents displayed on Sub DisplayLOOP test results aredisplayedas illustratedbelow.Resultsdisplayedon theLCDaredependent on the selected function.Pressthe“DISP”SwitchtotogglethetestresultsdisplayedontheSubDisplay.

Fig.7-7ContentsdisplayedonSubDisplay

Function(A)

ContentsdisplayedonSubDisplayaftertests

(B) (C)

L-PEATTON PFCValue L-NLOOP

Value PSCValue Backto(A)

L-PEATTOFF PFCValue Push

L-NLOOPValue Push PSCValue Push Backto(A)

L-N/L-L PSCValue L-NorL-LVoltage Backto(A)

If the display shows '>' then this usuallymeans the valuemeasuredexceedstherange.

MeasurementinL-PEATTONfunctionrequireslongertimethanthat is required for theothermeasurements (approx. 7 sec).Whenmeasuringacircuitwithalargeelectricalnoise,the'Noise'MessageisdisplayedontheLCDandthemeasurementtimewillbeextendedto20sec.Ifthe'NOISE'symbolisdisplayedontheLCD,itisrecommendedtomakemeasurementinL-PEATTOFFfunction.(RCDsmaytrip).

Ifanimpedanceof20ΩormoreismeasuredbetweenL-Nduringmeasurements in L-PEATTON function,“L-N>20Ω”is displayedon theLCDandnomeasurement canbemade. In this case,select L-PEATTOFF functionandmakemeasurement.RCDmaytripwhenperformingatestatL-PEATTOFFfunction.

Whena largecontactvoltageexists in thecircuitunder test,“n-E Hv”isdisplayedontheLCDandnomeasurementcanbemade.Inthiscase,selectL-PEATTOFFfunctionandmakemeasurement.RCDmaytripwhenperformingatestatL-PEATTOFFfunction.

Ifthesymbol( )appears,thismeansthatthetestresistoristoohot and theautomatic cut out circuits haveoperated.Allow theinstrumenttocooldownbeforeproceeding.Theoverheatcircuitsprotectthetestresistoragainstheatdamage.

Sub Display

Main Display

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Measured resultmaybe influenceddependingon thephaseangleofthedistributionsystemwhenmakingmeasurementnearatransformerandtheresultmaylowerthantheactualimpedancevalue.Errorsinmeasuredresultareasfollows.

SystemPhaseDifference

Error(approx.)

10° -1.5%20° -6%30° -13%

Fig.7-8ConnectionforusingOutlet

Fig.7-9Connectionfordistribution

PE

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Fig.7-10ConnectionforLine–Neutralmeasurement

Fig.7-11ConnectionforLine–Linemeasurement

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8. Phase Rotation Tests 1.OperatethePowerswitchandturnontheinstrument.PressthePHASEROTATIONfunctionswitch.

2.InserttheTestLeadsintotheinstrument.(Fig.8-1)

　　　　　　　　　　　　　　　　Fig.8-13.Connecteachtestleadstoacircuit.(Fig.8-2)

　　　　　　　　　　　　　　　　　　　Fig8-2

4.Resultsaredisplayedasfollows.

CorrectphasesequenceReversedphasesequenceFig.8-3　　　　　　　Fig.8-4

Whenamessage“no”or“---”isdisplayed,thecircuitmaynotbea3-phasesystemorawrongconnectionmayhavebeenmade.Checkthecircuitandtheconnection.PresenceofHarmonics inmeasurement voltages, suchasaninverterpowersupply,mayinfluencethemeasuredresults.

L1L3

L2

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9. Volts 1.OperatethePowerswitchandturnontheinstrument.PresstheVOLTSfunctionswitch.

2.InserttheTestLeadsintotheinstrument.(Fig.9-1)

Fig.9-13.VoltagevalueandfrequencywillbedisplayedontheLCDwhenapplyingACvoltage.

Fig.9-2

10. Back Light Pressing theBack Light Switch selects BacklightON /OFF.Backlightautomaticallyturnsoffin2minutesafteritturnson.

11. Auto-Test TheTestSwitch is lockedwhen the switch is presseddown for 3sec.TheredLEDontheswitchwillflash.Inthisautomode,whenusingdistributionboard leadModel 7246, tests are conductedbysimply disconnectingand reconnecting the redphaseprodof theModel 7246avoiding theneed to physically press the test buttoni.e.'handsfree'.

Frequency

Voltage

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12. Battery Replacement

# DANGERNever open the battery compartment coverwhilemakingmeasurement.Toavoidpossibleelectricalshock,disconnectthetestprobebeforeopeningthecoverforbatteryreplacement.

# CAUTIONInstallbatteriesincorrectpolarityasmarkedinside.Donotmixbatteriesofdifferenttypesornewbatterieswithusedones.

Whenthedisplayshowsthelowbatteryindication, ,disconnectthetest leadsFromtheinstrument.Removethebatterycoverandthebatteries.Replacewith six (6) new1.5VAAbatteries, takingcaretoobservecorrectpolarity.Replacethebatterycover.Batterytype:six(6)1.5VAAbatteries (Useofalkalinebatteries(LR6)isrecommended.)

Fig.12-1

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13. Servicing If this tester should fail to operate correctly, return it to yourdistributorstatingtheexactnatureofthefault.Beforereturningtheinstrumentensurethat:-1.Thebatteriesareingoodcondition.Please remember to give all the information possible concerning the nature of the fault, as this will mean that the instrument will be serviced and returned to you more quickly.

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14.Case and Strap Assembly 14-1HowtofastentheStrapbelt

(1)Pass theSideBelt throught he Buck l e as shown i nFig.14-1.(2pcs)

Fig.14-1

Fig.14-2

Fig.14-3

(2)Attach theSideBelt tothe instrument as showninFig.14-2.(bothsides)

(3)Attach thebothendsoftheStrapBelttotheSideBelt.(seeFig.14-3)

Buckle

Side Belt

Length of the belt is adjustable bysliding this adjuster.

Strap belt

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14-2HowtostoreinSoftCase

Follow theprocedure (1) and (2) as illustratedbelow to store theinstrumentintheSoftCase.

Fig14-4

(1)PasstheBeltattachedtotheinstrumentthroughtheslotontheSoftCaseandstoretheinstrumentintheSoftCase.

(2)Put a partition to be adjacent to the bottom face of theinstrument.(Storethetestleadsinthepartition.)

　　Fig14-5

Instrument

Soft Case

Partition

(1)(1)(2)(2)

Test Lead Strap belt

Cord beltTie up the test leads with the belt.

Complete

MEMO

DISTRIBUTOR

8-19 92-2019C

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