KYORITSU 4116A Guide

MODEL4116A,4118A,4120A
DIGITALPSC-LOOPTESTER
INSTRUCTIONMANUAL
KYORITSUELECTRICALINSTRUMENTS
WORKS，LTD.

CONTENTS
1.SAFETESTING ..............................................................................1
2.PROCEDUREOFREMOVINGCOVER .........................................3
3.FEATURES ......................................................................................4
3.1InstrumentLayout ....................................................................4
3.2TestLead ..................................................................................5
3.3Features ...................................................................................5
4.SPECIFICATIONS ..........................................................................7
5.OPERATINGINSTRUCTIONS .......................................................8
5.1InitialChecks .............................................................................8
5.2MeasurementoftheLoopImpedance ......................................9
5.3MeasurementofProspectiveShortCircuitCurrent .................10
6.DETAILEDEXPLANATION ...........................................................10
6.1MeasurementofFaultLoopImpedanceand
ProspectiveFaultCurrent .......................................................10
6.2MeasurementofOLD-TTSystem ............................................15
6.3MeasurementofLineImpedanceand
ProspectiveShortCircuitCurrent ............................................16
7.SERVICING ...................................................................................17
8.CASEANDSTRAPBELTASSEMBLY .........................................17

― 1 ―
1.SAFETESTING
Electricityisdangerousandcancauseinjuryanddeath.Alwaystreatit
withthegreatestofrespectandcare.Ifyouarenotquitesurehowto
proceed,stopandtakeadvicefromaqualifiedperson.Thisinstruction
manualcontainswarningsandsafetyruleswhichmustbeobservedby
theusertoensuresafeoperationoftheinstrumentandretainitinsafe
condition. Therefore, read through these operating instructionsbefore
usingtheinstrument.
IMPORTANT:
1.Thisinstrumentmustonlybeusedbyacompetentandtrained
personandoperatedinstrictaccordancewiththeinstructions.
KYORITSUwill notaccept liabilityfor anydamage orinjury caused
bymisuseornon-compliancewiththeinstructionsorwiththesafety
procedures.
2. Itisessentialtoreadandtounderstandthesafetyrulescontainedin
theinstructionsorwiththesafetyprocedures.
3. Thesymbolindicatedontheinstrumentmeansthattheusermust
referto therelated sections inthe manualfor safeoperation ofthe
instrument.Besuretocarefully readinstructionsfollowingeach
symbolinthis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 a
minorinjuryorinstrumentdamage.

― 2 ―
DANGER
●Thisinstrumentisintendedonlyforuseinsinglephaseoperation
at230V+10% -15%ACphaseto earthorfor useinOLD-TT
systemphasetoneutral.
● Whenconductingtestsdonottouchanyexposedmetalwork
associatedwiththeinstallation.Suchmetalworkmaybecomelive
forthedurationofthetest.
● Whentesting,always besureto keepyourfingers behindthe
safetybarriersonthetestleads.
● Besureto removethetest leadfromthe mainspowersupply
promptlyaftermeasurement.Donotleavetheinstrument
connectedtothemainspowersupplyforalongtime.
WARNING
●Never open the instrument case -therearedangerousvoltages
present.Ifafaultdevelops,returntheinstrumenttoyourdistributor
forinspectionandrepair.
●Iftheoverheatsymbolappearsinthedisplay( )disconnectthe
instrumentfromthemainssupplyandallowtocooldown.
●Ifabnormalconditions ofanysortare noted(suchasa faulty
display,unexpected readings,broken case,cracked testleads,
etc)donotusethetesterandreturnittoyourdistributorforrepair.
●Neverattempttousetheinstrumentiftheinstrumentoryourhand
iswet.
CAUTION
●Forthosetesterswithout theD-LOKcircuitry(models4116A,
4118A)allRCD's(RCCB,ELCB)inthecircuitmustbeby-passed
forthedurationofthetest(exceptonloop-2000Ω range).
DonotoperatetheRCDTestButtonwiththeRCDby-passed.
●Duringtestingitispossiblethattheremaybeamomentary
degradationofthereadingduetothepresenceofexcessive
transientsordischargesontheelectricalsystemundertest.
Shouldthis be observed,the testmust berepeated toobtain a
correctreading.Ifindoubt,contactyourdistributor.
●Use a damp cloth and detergent for cleaning the instrument. Do
notuseabrasivesorsolvents.

― 3 ―
2.PROCEDUREOFREMOVINGCOVER
Model4116A,4118Aand4120Ahaveadedicatedcovertoprotectagainst
animpactfromtheoutsideandpreventtheoperationpart,theLCDandthe
connectorsocketfrombecomingdirty.Thecovercanbedetachedandput
onthebacksideofthemainbodyduringmeasurement.
Fig.2
2.1Methodofremovingthecover
2.2Methodofhousingthecover
Fig.1

― 4 ―
3.FEATURES
3.1InstrumentLayout
1............LCDdisplay
2............WiringcheckLEDs
3...........Testbutton
4............Rangeswitch
5............Connector
LCD Connector
Fig.3
DANGER
●Useoriginaltestleadonly.
●Max.allowedvoltagebetweenmainstestterminalsandgroundis
300V.
●Thisinstrumentisintendedonlyforuseinsinglephaseoperation
at230V+10% -15%ACphaseto earthorfor useinOLD-TT
systemphasetoneutral.
①②
③④
⑤
Wiringcorrect
（GreenLED's）
ReversedL/Nterminals
（RedLED）

― 5 ―
3.2TestLead
TheinstrumentissuppliedwithModel7125leadatsocketoutletsandModel
7121distributionboardlead.
(1)Model7125
(2)Model7121
(IncludedasstandardequipmentforM-4118Aand4120A.OptionalforM-4116A.)
3.3Features
3.3-1TestRange(Function):
Note:
●*D-LOK=Automaticdevice(RCD)lock
●D-LOKdosenotoperateontheLoop-2000Ω.
●MainsvoltagewithwhichD-LOKoperatesisasshowninthetablebelow.
3.3-2AppliedStandards:
Instrumentoperation: IEC/EN61557-1,IEC61557-3
Safety: IEC/EN61010-1CATⅢ(300V)-instrument
IEC/EN61010-2-31CATⅢ(300V)-testlead
Protectiondegree: IEC60529(IP54)
Model
D-LOKCircuit*
Loop0-19.99Ω/
0-199.9Ω/0-1999Ω
PSC0-199.9A/
0-1999A/
0-4.00kA
M-4120A
○
○
○
M-4118A
×
○
○
M-4116A
×
○
×
Black-Neutral
Red-Phase
Green-Earth Fig.4
Range
Loop200Ω/PSC200A
Loop20Ω/PSC2000A,20kA
D-LOKOperatingVoltage
190〜253V
205〜253V

― 6 ―
3.3-3Model4116A,4118Aand4120Ahavethefollowingfeatures:
●Batteryisnotused Allmodelsarenotbattery-operated,butoperateby
thevoltagesuppliedfromthesystem.
●Wiringcheck ThreeLEDsindicateifthewiringofthecircuit
undertestiscorrect.TheP-EandP-NLEDs
illuminatewhenthe wiringpolarityofthecircuit
undertestiscorrect.
TheReverseLEDislitwhenPandNare
reversed.
●Overtemperature Detectsoverheatingoftheinternalresistor
displayingawarningsymbol()andautomatically
haltingfurthermeasurements.
●Overloadprotection Haltsmeasurementtopreventdamages tothe
bodywhenvoltagebetweenVL-PEis260Vor
more.
"VL-PEHi"isshownonthedisplay.
●D-LOKcircuit Model4120AwithuniqueD-LOKcircuitavoidsthe
needtoby-passmostRCD's.
●15mALoop Loopimpedance 2000Ω rangemeasurementis
carriedoutwithlowtestcurrent(15mA).The
currentwill notcause trippingoutinvolved RCD
eventhe one withthe lowestnominal differential
current(30mA).
●Display Theliquid crystaldisplay has31/2 digitswith a
decimalpoint andunitsof measurement(Ω,A,
kA,V).
●ManualandAutotestmode
Manual − Pressandreleasethe"PresstoTest"button.Theresultwillbe
displayedfor3sandthenthedisplaywillreverttoACvoltage.
Autotest− The"PresstoTest"buttoncanbeturnedclockwisetolockit
down.Inthis automode,whenusing distributionboardlead
M-7121,tests areconductedby simplydisconnectingand
reconnectingtheredphaseprodoftheM-7121avoidingthe
needtophysicallypressthetestbuttoni.e."handsfree".
protection

measurement
CAUTION
●TheD-LOK circuitsmay notby-passsome RCD'sand thiswill
resultintheRCDtrippingoutastheywoulddowithaconventional
looptester. Also,in thecaseof highsensitivity RCD'sratedat
10mAorlesstheD-LOKcircuitsmaynotfunction.

― 7 ―
4.SPECIFICATIONS
●MeasurementSpecification
Instrumentdimensions 186×167×89mm
Instrumentweight M-4120A/960g,M-4116AandM-4118A/750g
Referenceconditions Specificationsarebasedonthefollowingconditions
exceptwhereotherwisestated:
1． Ambienttemperature: 23± 5℃
2． Relativehumidity:45%to75%
3． Position:horizontal
4． ACpowersource:230V,50Hz
5． Altitude:Upto2000m
Operatingtemperature 0 to +40℃, relativehumidity80%orless,no
condensation.
Storagetemperature
− 20to +60℃,relativehumidity75% orless,no
condensation.
Symbolsusedonthe Equipmentprotected throughoutby DOUBLE
INSULATIONorREINFORCEDINSULATION.
Caution（refertoaccompanyinginstruction
manual）
andhumidity
andhumidity
instrument
LoopImpedance(IEC61557-3)
ProspectiveShort-circuitCurrent(M-4118A,M-4120A)
Voltage
Range
20Ω
200Ω
2000Ω
Measuringrange
0.00〜19.99Ω
0.0〜199.9Ω
0〜1999Ω
Nominaltest c urrent
at0Ω externalloop
25A/20ms
2.3A/40ms
15mA/280ms
Accuracy
±(2%rdg+4dgt)
Range
200A
2000A
20kA
Measuringrange
0.0〜199.9A
0〜1999A
0.00〜 4.00kA
Nominaltest c
urrent
at0Ω externalloop
2.3A/40ms
25A/20ms
25A/20ms
Accuracy
Consideraccuracy
ofLoopImpedance
Measuringrange
110〜 260V
Accuracy
±(2%rdg+4dgt)

― 8 ―
5.OPERATINGINSTRUCTIONS
5.1InitialChecks-Tobecarriedoutbeforeanytesting.
(1)TestLeadConnection
Insertthe leadplug intothe connectoron theinstrument correctlyas
shownbelow.
(2)WiringCheck
Beforepressingthe"TestButton"alwayschecktheLED'sforthe
followingsequence:
P-EGreenLEDmustbeON
P-NGreenLEDmustbeON
RedLEDmustbeOFF
CAUTION
●Alwaysinspectyourtestinstrumentand leadaccessories for
abnormalityordamage. IfabnormalconditionsexistDO NOT
PROCEEDWITHTESTING.
LeadPlug Fig.5
●OperatingErrorofLoopImpedance(61557-3)
Range
20Ω
200Ω
2000Ω
Measuringrangetokeep
operatingerror
0.20〜 19.99Ω
20.0〜 199.9Ω
200〜 1999Ω
Maximumpercentage
operatingerror
±30%
Theinfluencingvariations used for calculatingthe operatingerrorare
denotedasfollows:
Temperature：0℃ and40℃
Phaseangle：Ataphaseangle0゜to18゜
Systemfrequency：49.5Hzto50.5Hz
Systemvoltage：230V+10%-15%

― 9 ―
(3)VoltageMeasurement
Whenthe instrument isfirstconnected tothesystem, itwilldisplay the
phase-neutralvoltagewhichisupdatedevery1s.Thismodeiscancelled
wheneverthe testbutton ispressed. Ifthis voltageis notnormal oras
expected,DONOTPROCEED.
5.2MeasurementoftheLoopImpedance
(1)Settheinstrumenttothe200Ω or2000Ω range.
Ifthe instrument isset tothe 20Ω range slightsparking mayoccur
whentesting withthedistribution boardlead althoughtheunithas
beendesignedtominimizethis.
(2)Connecttheleadtotheinstrument.
(3)Plugthemouldedmainsplugtothesocketbeingtested.
(4)Checkthe LED'sare litas indicatedin section5.1. IfnotDO NOT
PROCEED-checkwiring.
(5)Notethemainsvoltageifrequired.
(6)Pressthe"PresstoTest"button.Thevalueofloopimpedancewillbe
displayedwiththeappropriateunits.Ableepwillsoundoncompletion
ofthetest.
Forbestresultsalwaystestonthelowestpossiblerange.
Forexample, a loopimpedance measuredon the200Ω range may
giveanindicationof0.3Ω whereasonthe20Ω rangeitmayread0.28
Ω.Intheeventofthereadingbeinginexcessoftherange(e.g.more
than20Ω onthe20Ω range)theappropriateover-rangesymbol"OL"
willappearonthedisplay.
Noharmwillbedonetotheinstrumentbyselectingtoolowarange.
WARNING
●IftheabovesequenceisNOTdisplayedortheREDLEDisonfor
anyreason , DONOT PROCEEDAS THEREIS INCORRECT
WIRING.Thecauseofthefaultmustbeinvestigatedandrectified.
WARNING
●Thisinstrumentisintendedonlyforuseinsinglephaseoperation
at230V+10% -15%ACphaseto earthorfor useinOLD-TT
systemphasetoneutral.

― 10 ―
5.3MeasurementofProspectiveShortCircuitCurrent
−(Models4118Aand4120A)
(1)Settheinstrumenttothe20kArange.
(2)Connectthetestleadtotheinstrument.
(3)Attachtheplugtothesockettobetested.
(4)CheckthattheLED'sarelitinthesequenceindicatedinsection5.1.If
not,disconnectfromthemainsandcheckthewiringatthesocket.
(5)Pressthe"PresstoTest"button.Theprospectiveshortcircuitcurrent
(PSC)willbedirectlydisplayedontheLCDwiththeappropriateunits.
Thiswillremainfor3sandthenreverttoACvoltagedisplay.
Anaudiblebeepwillsoundoncompletionofthetest.Forbestresults
alwaystestonthelowestpossiblerange.
Forexample aPSC measuredon the2000A rangemay read60A
whilstonthe200Arangeitmayread56.0A.Toholdthereadingkeep
thebuttonhelddownorturnclockwisetolockforAutoTest.
Note:
●Forloopimpedancegreaterthan210Ω onPSC200Arangeand25
Ωon2000A,20kAranges,thefaultvoltagemaybecomehighand
dangerousduetotheD-LOKcurrent,therefore,theunitisdesigned
tolockoutPSCrangesshowing"Uf-Hi"symbol.
NormallyPSCtestsareconductedatpointoforigin,e.g.distributionboards,
betweenphaseandneutral.
WhenconductingPSC testsatsocketoutlets, atestwillbe conducted
betweenphaseandearthduetothefixedwiringofthemouldedmainsplug.
WARNING
●Thisinstrumentisintendedonlyforuseinsinglephaseoperation
at230V+10% -15%ACphaseto earthorfor useinOLD-TT
systemphasetoneutral.
6.DETAILEDEXPLANATION
6.1 MeasurementofFaultLoopImpedanceandProspectiveFaultCurrent
Iftheelectricalinstallationsareprotectedby over-currentprotection
devicesorbyfuses,theFaultloopimpedanceshouldbemeasured.

― 11 ―
Inthe event ofa fault,the Fault loopimpedance shouldbe lowenough
(andthe Prospective Faultcurrent higherenough) in orderto havethe
automaticdisconnectionofsupplybytheinstalledprotectiondevicewithin
prescribedtimeinterval.
Everycircuitmust betestedto makesurethat thefaultloop impedance
doesnotexceed thatspecifiedforthe overcurrentprotectiondevice
concerned.
ForTTsystemtheFaultloopimpedanceisthesumofthefollowingpartial
impedances:
¡Impedanceofpowertransformer'ssecondary.
¡Phaseconductorresistancefrompowertransformertofaultlocation.
¡Protectionconductorresistancefromfaultlocationtolocalearth
system.
¡ResistanceoflocalearthsystemR.
¡Resistanceofpowertransformer'searthsystemRo.
Thefigure belowshowsin markedline theFault loopimpedance forTT
system.
Fig.6
ForTNsystemtheFaultloopimpedanceisthesumofthefollowingpartial
impedances:
¡Impedanceofpowertransformer'ssecondary
¡Phaseconductorresistancefrompowertransformertofaultlocation
¡Protectionconductorresistancefromfaultlocationtopowertransformer

― 12 ―
Fig.7
AccordingtotheinternationalStandardIEC60364forTTsystemthe
followingconditionshallbefulfilledforeachcircuit:
RA
＜
50/Ia
Where:
¡RA isthesum oftheresistancesof thelocalearthsystem Rand
protectionconductorconnectingittotheexposedconductivepart.
¡50 isthemaxcontactvoltagelimit(itcouldbe25Vinparticularcases)
¡Ia isthecurrentcausingtheautomaticdisconnectionoftheprotective
devicewithin5s.
Whentheprotectiondeviceisaresidualcurrentdevice(RCD),Ia istherated
residualoperatingcurrentI⊿n.
ForinstanceinaTTsystemprotectedbyaRCDthemaxRAvaluesare:
Note:
●The loop tester models 4120A / 4118A / 4116A measure the fault
loopimpedancethatisavaluenormallyalittlebithigherofRA.
But,ifthe electricalinstallationis protectedconsideringthe loop
impedancevalue,alsotheRAformulawillbefulfilled.
RatedresidualoperatingcurrentI⊿n.
RA(at50V)
10
5000
2500
30
1667
833
100
500
250
300
167
83
500
100
50
1000
50
25
mA
Ω
Ω
RA(at25V)
Thefigure below showsin markedline theFaultloop impedancefor TN
system.

L1
L2
L3
N
PE
R
R
O
RCD 30mA
― 13 ―
Forthis examplemax valueis1667Ω, theloop testerreads12.74Ω, it
meansthattheconditionRA
＜
50/Ia isrespected.
Itisfundamentalforthisexample totestalsotheRCDtoensurethat
operationtakesplacequicklyenoughtorespectthesafetyrequirements.In
ordertodoit,canbeusedtheRCDtestermodel5406A.
AccordingtotheinternationalStandardIEC60364forTNsystemthe
followingconditionshallbefulfilledforeachcircuit:
Zs
＜
Uo/Ia
Where:
¡Zs istheFaultloopimpedance.
¡Uo isthenominalvoltagebetweenphasetoearth.
¡Ia isthecurrentcausingtheautomaticdisconnectionoftheprotective
devicewithinthetimestatedintableasfollows:
Note:
●Fora distributioncircuit adisconnection timenot exceeding5s is
permitted.
●Whentheprotectiondeviceisaresidualcurrentdevice(RCD),Ia is
theratedresidualoperatingcurrentI⊿n.
Uo(Volts)
120
230
400
>400
T(seconds)
0.8
0.4
0.2
0.1
Fig.8
PracticalexampleofverificationoftheprotectioninaTTsystemaccording
totheinternationalStandardIEC60364.

― 14 ―
ForinstanceinaTNsystemwithnominalmainsvoltageUo=230V
protectedbygGfusestheIa andmaxZs valuescouldbe:
Usingthecurrentrangesonmodels4120Aand4118Acanbe alsotested
theProspectiveFaultcurrent.
ProspectiveFaultcurrentmeasuredbyinstrumentsmustbehigherthanIa
oftheprotectivedeviceconcerned
PracticalexampleofverificationoftheprotectioninaTNsystemaccording
totheinternationalStandardIEC60364.
Fig.9
Rating
(A)
Disconnectingtime5s
Ia(A) Zs(Ω) Ia(A) Zs(Ω)
Disconnectingtime0.4s
6
10
16
20
25
32
40
50
63
80
100
28
46
65
85
110
150
190
250
320
425
580
8.2
5
3.6
2.7
2.1
1.53
1.21
0.92
0.71
0.54
0.39
47
82
110
147
183
275
320
470
550
840
1020
4.9
2.8
2.1
1.56
1.25
0.83
0.72
0.49
0.42
0.27
0.22
L1
L2
L3
N
PE
R
O
Fuse
g
G 16A

― 15 ―
MaxvalueofZsforthisexampleis2.1Ω (16AgGfuse,0.4s)thelooptester
reads1.14Ω (or202AonFaultcurrentrange)itmeansthattheconditionZs
＜
Uo/Ia isrespected.
InfacttheZsof1.14Ω isless than2.1Ω (ortheFaultcurrentof202Ais
morethanIaof110A).
6.2Measurementof"OLD-TTSystem"
OLD-TTsystemisa TTsystemwithphaseto phasevoltageof220V
(insteadof400V) andphasetoearthof127 V(insteadof230V)and
normallytheneutralconductorisnotused.
Connectingthe looptestersto thissystem,all threewiringcheck LEDs
shouldbelitandthedisplayreadsavalueof127V.
Onlyifall theseconditionsarerespectedthetestcanbecarryout.
Fig.10
WARNING
●Thisinstrumentisintendedonlyforuseinsinglephaseoperation
at230V+10% -15%ACphaseto earthorfor useinOLD-TT
systemphasetoneutral.
●Iftheoverheatsymbolappearsinthedisplay( )disconnectthe
instrumentfromthemainssupplyandallowtocooldown.
L1
L2
L3
PE
R
R
O
RCD 30mA
220V
220V
220V

― 16 ―
6.3 MeasurementofLineImpedanceandProspectiveShortCircuitCurrent
LineImpedanceonsingle-phasesystemistheimpedancemeasured
betweenphaseandneutralterminals.
Measurementprincipleusedinsidetheinstrumentisexactlythesameasat
Fault Loop Impedance measurement, but the measurement is carried out
betweenLandNterminals.
Breakingcurrentcapacityofinstalledover-currentprotectiondevicesshould
behigherthanProspectiveShort-Circuitcurrent,otherwiseitisnecessaryto
changetheratedcurrentofinvolvedover-currentprotectiondevice.
Practicalexampleoflineimpedancetestandprospectiveshort-circuit
currenttest(onlyformodels4120Aand4118A):
ThefigurebelowshowsinmarkedlinetheLineimpedancephasetoneutral
forTNsystem.
Fig.11
WARNING (OLD-TTsystemonly)
●DO NOT PRESS the"Testbutton"ifthedisplayreadsavalueof
220V!
TheRCDcouldtripduringthetestsalsowithmodel4120A.
CAUTION
●TheD-LOK circuitof 4120Acan notworks with127Vbetween
phasetoearth.
L1
L2
L3
N
PE
R
O
RCD
L
PE
N

― 17 ―
7.SERVICING
Ifthistestershouldfailtooperatecorrectly,returnittoyourdistributorstating
theexactnatureofthefault.
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.
8.CASEANDSTRAPBELTASSEMBLY
CorrectassemblyisshowninFig12.Byhangingtheinstrumentroundthe
neck,bothhandswillbeleftfreefortesting.
WARNING
●Thisinstrumentisintendedonlyforuseinsinglephaseoperation
at230V+10% -15%ACphaseto earthorfor useinOLD-TT
systemphasetoneutral.
●Iftheoverheatsymbolappearsinthedisplay( )disconnectthe
instrumentfromthemainssupplyandallowtocooldown.
●Whentestinginstallationthathasalargecurrentcapacity,suchas
apowerline,besurenottoshortliveconductorswiththetipofa
probe.Failuretofollowtheseinstructioncancausehazardstothe
user.
Fig.12
Pass the strap belt down
throughthe sidepanelofthe
mainbodyfromthetop,andup
throughtheslots of the probe
casefromthebottom.
Passthestrapthroughthe
buckle,adjustthestrapfor
lengthandsecure.

01-05
92-1483
DISTRIBUTOR
Kyoritsureserves therights tochange specificationsor designs
describedinthismanualwithoutnoticeandwithoutobligations.