Kyoritsu Electrical Instruments Works, Ltd. 6050 User manual

MODEL 6050
COMBITESTER(LOOP+RCD)
INSTRUCTION MANUAL
KYORITSU ELECTRICAL INSTRUMENTS
WORKS，LTD.

CONTENTS
1.SafeTesting ......................................................................................1
2.Procedureofremovingcover ............................................................4
2.1Methodofremovingthecover....................................................4
2.2Methodofstoringthecover........................................................4
3.Features ............................................................................................5
3.1InstrumentLayout .......................................................................5
3.2TestLead ...................................................................................6
3.3OpticalAdapterModel8212.......................................................6
3.4TestRange(Function) ................................................................7
3.5AppliedStandards ......................................................................7
3.6Features ......................................................................................7
4.Specification ......................................................................................9
5.LoopImpedance/PSCTests ........................................................12
5.1PrinciplesofMeasurement ......................................................12
5.2LOOPImpedanceandPSCTesting........................................18
6.RCDTests ......................................................................................20
6.1PrinciplesofMeasurement.......................................................20
6.2RCDTesting .............................................................................22
7.UcTests .........................................................................................24
7.1PrinciplesofMeasurement.......................................................24
7.2UcTesting .................................................................................24
8.Auto-Test ........................................................................................25
9.Store/Recallameasuredresult.....................................................25
9.1Howtostoredata .....................................................................25
9.2Recallthestoreddata ..............................................................26
9.3Deletethestoreddata ..............................................................27
9.4TransferthestoreddatatoPC.................................................27
10.Batteryreplacement .....................................................................28
11.Servicing .......................................................................................29
12.CaseandStrapassembly .............................................................29

 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warning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.
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correspondstoL-PE:230V+10%-15%50Hz.(for
someofranges;L-L:400V+10%-15%50Hz)
Besuretouseitwithinthisratedvoltage.
●  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.
●  For safety reasons only use accessories (test leads, probes,
cases, etc)designed to be used with this instrument and
recommended by KYORITSU. The use of other accessories is
prohibitedastheyareunlikelytohavethecorrectsafetyfeatures.
●  THE WIRING CHECK LED (P-E, P-N) of this instrument is to
protect the user from electrical shock resulting from incorrect
connectionofLineandNeutralorLineandEarth.
 WhentheNeutralandEarthconductorsareincorrectlywired,the
WIRINGCHECKLEDfunctioncannotidentify theincorrect
connection. Other procedures and test must be conducted to
checkandconfirmthatthewiringiscorrectpriortomaking
measurement.
 Donotusethisinstrumenttocheckthecorrectwiringofthepower
supply.
 Kyoritsuwillnotbeheldliableforanyaccidentthatmayresultfrom
incorrectwiringofthepowersupplyline.

 3 
#WARNING
● 
Never open the instrument case
-(exceptforbatteryreplacement
and in this case disconnect all leads first) because dangerous
voltages are present. Only fully trained and competent electrical
engineers should open the case. If a fault develops, return the
instrumenttoyourdistributorforinspectionandrepair.
●  Iftheoverheatsymbolappearsonthedisplay( )disconnectthe
testleadfromthecircuit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.
● Donotrotatefunctionswitchwhentestbuttonisdepressed.
#CAUTION
● 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.
● Beforeusingtheinstrument,pleaseinsertthebatteriesrightlyin
accordancewiththe"10.BATTERYREPLACEMENT"ofpage
28.Whennotinstalling batteries, all the functions of the
instrumentsdon'twork.

 4 
2. PROCEDURE OF REMOVING COVER
Model 6050has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 storing the cover
Fig.1

 5 
3. FEATURES
3.1 Instrument Layout
1......LCD
2......RCDFUNCTIONSELECTSWITCH
(MEMORYRECALLSWITCH)
3......0°/180°SELECTSWITCH
(ENTERSWITCH)
4......ULVALUESELECTSWITCH
(MEMORYCLEARSWITCH)
5......TESTBUTTON
6......WIRINGCHECKLED

LEDindicationofcorrectpolarityisthattheP-EandP-NLEDsare
lit.PandNarereversedwhenthe reverseLEDislit.
7......"I⊿n/LOOP/PSC"SELECTSWITCH
(MEMORYSELECTSWITCH)
8......MEMORYMODESWITCH
(MEMORYMODEEXITSWITCH)
9......FUNCTIONSWITCH
OperationatMemorymodeisshownin().
1
6
7
8
9
2
3
4
5
Fig.3

 6 
Black-Neutral
Red-Phase
Green-Earth Fig.7
Fig.4
OpticalAdasperModel8212
(OptionalAccessory)
TestLeadModel7125orModel7121(OptionalAccessory)
LCDDISPLAY
Fig.5
Fig.6
3.2 Test Lead
TheinstrumentissuppliedwithModel7125Leadatsocketoutletsand
Model7121,whichisanoption,formeasuringdistributionboard.
1.Model7125
2.Model7121(OptionalAccessory)
3.3 Optical Adapter Model 8212 (Optional Accessory)
For Model 6050, data can be transferred to PC via Optical Adapter
Model8212.Model8212issuppliedwithPCsoftware"KEWREPORT".
Model8212operatesPC/ATcompatiblemachineon
Windows○
R98/ME/2000/XP.Pleasereferto"9.4 Transfer the stored
Fig.8

 7 
data to PC"forfurtherdetails.
Windows®isaregisteredtrademarkofMicrosoftintheUnitedstates.
3.4 Test Range (Function)
Model6050performsfourfunctions.
1.LOOP.....Loopimpedancetester
2.RCD.......RCDtester
3.Uc..........Contactvoltagetester
4.PSC.......Prospectiveshortcircuitcurrenttester
3.5 Applied Standards
Instrumentoperation:IEC/EN61557-1,3,6,10
Safety: IEC/EN61010-1CATⅢ(300V)-instrument
IEC/EN61010-031CATⅢ(600V)-testlead
Protectiondegree: IEC60529(IP54)
3.6 Features
Model6050hasthefollowingfeatures:
●Wiringcheck
ThreeLEDsindicateifthewiringofthecircuit
undertestiscorrect.
●Overtemperature
protection
Detectsoverheatingoftheinternalresistorand
of the current control MOS FET displaying a
warningsymbol( )andautomaticallyhalting
furthermeasurements.
●Phaseangle
selector
RCD test can be selected from either the
positive (0°) or from the negative (180°) half-
cycleofvoltage.Atbothpolarity,testminimum
(best)andmaximum(worst)triptimes.
●Autodatahold
Measuredresultisbeinghelduntilanyswitch
otherthanMEMswitchispressed.Instrument
is back to voltage measurement mode when
applyingvoltage again during data hold
functionisoperated.

 8 
●ULvalueselector
SelectUL(limitofcontactvoltagevalue)25V
or 50V. Where Uc (contact voltage) exceeds
UL value at RCD testing, "UcH" willbe
displayedwithoutstartingthemeasurement.
● VoltageIndication
WhenconnectingTestLeadtocircuit,voltage
between L-PE is displayed. If the voltage is
lower than 100V, displayed as "V L-PE Lo".
Andifitishigherthan260V,displayedas"VL- 
PE Hi".But on L-L measurement range,
displayedas"VL-PEHi"ifthevoltageis440V 
ormore.
●Lowbattery
warning
" "symbolappearsinthedisplayifthebattery
voltagedropsbelow8V.
●Autopoweroff
Automaticallyswitchestheinstrumentoffafter
aperiodofapproximately10minutes.
●Display
Theliquidcrystaldisplayhas31/2digitswitha
decimal point and units of measurement (V,
Ω,A,kA,mA,ms)
●Datamemory,
Communication
facility
Canstore300measuredresult.
Data canbe transferredto PCvia Optical
AdapterModel8212.
●Optional
Accessory
1)Model7121formeasuringdistributionboard
orlightingcircuittestlead.
2)OpticalAdapterModel8212 (withPC
software"KewReport")
●AutoTest
InstrumentbecomesAutotestmodebyturning
Testbuttontorightandlockedit.UnderAuto
test mode, test starts automatically only by
connectingTestLeadtoameasuringcircuit.

 9 
4. SPECIFICATION
Measurement Specification
Function Range
RatedVoltage
(AC)
Test
Current Accuracy
LOOP
PSC
Function
Uc
20Ω L-PE:
+ 10％
230V 50Hz
-15%
3A
15mA
15mA
15mA
3A
max15mA
5mAonlyat
I⊿n=10mA
± (3%rdg+8dgt)
± (3%rdg+8dgt)
AtL-Lmeasurement:
± (3%rdg+12dgt)
± (3%rdg+8dgt)
PSCaccuracyisa
derivedfrom
measuredloop
impedance
specification.
200Ω
2000Ω
200A
2000A
20kA
L-PE:
+ 10%
230V 50Hz
-15%
L-L:
+ 10%
400V 50Hz
-15%
L-PE:
+ 10%
230V 50Hz
-15%
L-L:
+ 10%
400V 50Hz
-15%
L-PE:
+ 10%
230V 50Hz
-15%
Range
100V
RatedVoltage
(AC)
L-PE:
+ 10%
230V 50Hz
-15%
Test
Current Accuracy
+5%〜+15%
± 8dgt

 10 
Function
Voltage
Measurement
Range
100-260V
L-Lcorrespondingrange:
100-440V
RatedVoltage
(AC)
100-260V
L-Lcorrespondingrange:
100-440V
Accuracy
±(2%rdg+4dgt)
RCD
RatedVoltage
(AC)
L-PE:
+ 10%
230V 50Hz
-15%
Accuracy
± (1%+3dgt)
Function TripCurrent TripTime
×1/2
×1
×5
DC
AutoRamp
-8%〜-2%
+2%〜+8%
± 10%
± 4%
RCDTripCurrent(I⊿n)andTripCurrentDuration
Note:Biascurrent(DC6mA)addedtoDCrange.
●Instrumentdimensions
●Instrumentweight
186×167×89mm
980g
RCDTrip
Current
Duration
(ms)
RCDTripCurrentI⊿n(mA)
× 1/2
× 1
× 5
DC
Auto
Ramp
10
1000
1000
200
1000
30
1000
1000
200
1000
100
1000
1000
200
1000
300
1000
1000
n.a.
1000
500
1000
1000
n.a.
200
1000
1000
200
n.a.
n.a.
n.a.
Goesupby10%from20%to110%ofI⊿n.
300ms×10
n.a.:notapplicable

 11 
●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and
humidity.
0to40℃ ,relativehumidity85%orless,no
condensation.
●Storage
temperatureand
humidity.
-20to+60℃ ,relativehumidity85%orless,no
condensation.
●Symbols used on
theinstrument
Equipment protectedthroughoutby
DOUBLE INSULATION or REINFORCED
INSULATION.
#
Caution(refertoaccompanyinginstruction
manual)
●Batterytype
EightR6orLR6batteries
Measurement times : approx 800timesor
more.(Measureattheintervalof30seconDC
10mArangeofRCDfunction.)
●OperatingErrorsofLoopimpedance(IEC61557-3)
Theinfluencingvariationsusedforcalculatingtheoperatingerrorare
denotedasfollows:
Temperature:0℃and40℃
Phaseangle:Ataphase0°to18°
Systemfrequency:49.5Hzto50.5Hz
Systemvoltage:230V+10%-15%
Supplyvoltage:8Vto13.8V
Range
20Ω
200Ω
2000Ω
Measuringrangetokeep
operatingerror
0.4〜19.99Ω
20.0〜199.9Ω
200〜1999Ω
Maximumpercentage
operatingerror
±30%

 12 
Function Operatingerroroftripcurrent
×1/2 -10%〜0%
×1 0%〜+10%
×5 0%〜+10%
AutoRamp -10%〜+10%
●OperatingErrorsoftripcurrent(IEC61557-6)
The influencing variations used for calculating the operating error are
denotedasfollows:
Temperature:0℃and40℃
Earthelectroderesistance:
I n(mA)
10
30
100
300
500
1000
Earthelectroderesistance(Ω)
UL50V
2000
600
200
130
80
40
UL25V
2000
600
200
65
40
20
table.1
Systemvoltage:230V+10%-15%
Supplyvoltage:8Vto13.8V
#CAUTION
Eventhough the test current inthe 2000ohm range (15mA test
current) is low some RCD's may trip due to sensitivity or where
theremayalreadybeadditionalleakageinthecircuitbeingtested.
The Loop impedance in a TN system is small and therefore it is
notrecommendedtotestinthe2000ohmrange.RCD'swillhave
tobebridgedtoavoidtrippingwhenusingothertestranges.

 13 
5.1 Principles of Measurement
5.1-1 Measurement of Fault Loop Impedance and Prospective Fault
Current
Ifanelectricalinstallationisprotectedbyover-currentprotectivedevices
includingcircuitbreakersorfuses,theearthfaultloopimpedanceshouldbe
measured.
Intheeventofafaulttheearthfaultloopimpedanceshouldbelowenough
(and the prospective fault current highenough)to allowautomatic
disconnectionoftheelectricalsupplybythecircuitprotectiondevicewithina
prescribedtimeinterval.
Everycircuitmustbetestedtoensurethattheearthfaultloopimpedance
valuedoesnotexceedthatspecifiedorappropriatefortheover-current
protectivedeviceinstalledinthecircuit.
ForaTTsystemtheearthfaultloopimpedanceisthesumofthefollowing
impedances;
●Impedanceofthepowertransformersecondarywinding.
● Impedanceofthephaseconductorresistancefromthepowertransformer
tothelocationofthefault.
● Theimpedanceoftheprotectiveconductorfromthefaultlocationtothe
localearthsystem.
●Resistanceofthelocalearthsystem(R).
●Resistanceofthepowertransformerearthsystem(Ro).
5. LOOP IMPEDANCE / PSC TESTS
Fig.9

 14 
ForTNsystemstheearthfaultloopimpedanceisthesumofthefollowing
impedances.
●Impedanceofthepowertransformersecondarywinding.
●Impedanceofthephaseconductorfromthepowertransformertothe
locationofthefault.
● Impedanceoftheprotectiveconductorfromthefaultlocationtothepower
transformer.
InaccordancewiththeinternationalstandardIEC60364foraTTsystemthe
followingconditionshallbefulfilledforeachcircuit.
RAmustbe<
50/la
where;
RA is the sum of the resistances of the local earth system R and the
protectiveconductorconnectingittotheexposedconductorpart.
50Visthemaximumvoltagelimit(itmaybe25Vincertaincircumstances).
la is the value of current that causes automatic disconnection of the
protectivedevicewithin5seconds.
Whentheprotectivedeviceisaresidualcurrentdevice(RCD),Iaistherated
residualoperatingcurrentI⊿n.
ForexampleinaTTsystemprotectedbyanRCDthemaximumRAvalues
areasfollows;
Fig.10
RatedresidualoperatingcurrentI⊿nmA
10
5000
2500
30
1667
833
100
500
250
300
167
83
500
100
50
1000
50
25
RA(at50V)Ω
RA(at25V)Ω

 15 
Uo(Volts)
120
230
400
>400
T(seconds)
0.8
0.4
0.2
0.1
Fig.11
PracticalexampleofverificationoftheprotectionisaTTsystemaccordingto
theinternationalStandardIEC60364.
Forthisexamplethemaximumvalueis1667Ω,thelooptesterreads12.74
ΩandconsequentlytheconditionRAis<
50/laismet.
It is fundamental for this example to test also the RCD to ensure that
operationtakesplacequicklyenoughtorespectthesafetyrequirement.
According to the international Standard IEC 60364 for TN system the
followingconditionshallbefulfilledforeachcircuit:
Zs<
Uo/la
Where;
Zsistheearthfaultloopimpedance.
Uoisthenominalvoltagebetweenphaseandearth.
laisthecurrentthatcausestheautomaticdisconnectionoftheprotective
devicewithinthetimestatedinthefollowingtable.

 16 
Note:
●For a distribution circuit a disconnection time not exceeding 5s is
permitted.
●Whentheprotectivedeviceisaresidualcurrentdevice(RCD),laisthe
ratedresidualoperatingcurrentI⊿n.
ForinstanceinaTNsystem withanominalvoltageofUo =230V
protectedbytypegGfusesthelaandmaximumZsvaluescouldbe:
6
10
16
20
25
32
40
50
63
80
100
Ia(A)
28
46
65
85
110
150
190
250
320
425
580
Zs(Ω)
 8.2
 5
 3.6
 2.7
 2.1
 1.53
 1.21
 0.92
 0.71
 0.54
 0.39
Ia(A)
47
82
110
147
183
275
320
470
550
840
1020
Zs(Ω)
 4.9
 2.8
 2.1
 1.56
 1.25
 0.83
 0.72
 0.49
 0.42
 0.27
 0.22
Rating
(A)
Disconnectingtime5s Disconnectingtime0.4s
Iftheprospectivefaultcurrentismeasured,itsvaluemustbehigherthanthe
lavalueoftheprotectivedeviceconcerned.
On200APSCrange,forLoopimpedancelowerthan5ohm(PSCgreater
than50Aapprox230V)isnotpossibletoobtainanaccuratePSCreading
eveniftheunitwillgivearesult.Inthesecases,foraccuratePSCtests,
pleaseusethe2000Aor20kAranges.

 17 
Practical example of verification of the protection is a TT system
accordingtotheinternationalStandardIEC60364.
Fig.12
ThemaximumvalueofZsforthisexampleis2.1Ω(16ampgGfuse,0.4
seconds).The loop tester reads 1.14Ωand consequently the condition
Zs<
Uo/laismet.
5.1.2 Principles of the Measurement of Line Impedance and
Prospective Short Circuit Current
Lineimpedanceistheimpedance,whichismeasuredbetweenPhase-
terminal L and Neutral-terminal N of single-phase system, or between
twophasesofthree-phasesystem.Measurementprincipalusedinthis
instrumentisthesameasitforFaultloopimpedancemeasurement,but
measurementisperformedbetweenTerminalLandN,orbetweentwo
phases.
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.

 18 
MethodofImpedancetestbetweenLineandNeutralandProspective
ShortCircuitedCurrenttest
Method of Impedance test between Line and Line and Prospective
ShortCircuitedCurrenttest
5.2 LOOP Impedance and PSC Testing
5.2.1 Preparation
(1)TurnFunctionswitchandpowerontheinstrument.SelectLOOPor
PSC.
(2)Select the range for a test with "I⊿n / LOOP / PSC" SELECT
SWITCH.Bypressing"I⊿n/LOOP/PSC"SELECTSWITCH,▼
markonLCDshiftsandcanselecteachrange.
Fig.13
Fig.14