KYORITSU 3131A User manual

MODEL
３１３１ A
ANALOGUEINSULATIONTESTER
INSTRUCTIONMANUAL
KYORITSUELECTRICALINSTRUMENTS
WORKS，LTD.,TOKYOJAPAN

Contents
1. SafetyPrecautions ................................................................................1
2.Features ...............................................................................................3
3.Specifications ......................................................................................4
4.InstrumentLayout .................................................................................6
5.PreparationforTesting .........................................................................7
5-1RemovingtheCover .....................................................................7
5-2 MechanicalZeroAdjustment ........................................................8
5-3 BatteryVoltageCheck ..................................................................8
5-4 TestProbeConnection .................................................................8
5-5TestProbeCheck .........................................................................8
6.Operation ............................................................................................9
6-1
DisconnectionandCheck ofPowerSourceofCircuitUnderTest ..........9
6-2 InsulationResistanceMeasurement .........................................10
6-3 ContinuityTesting(ResistanceTests) .......................................11
6-4 ContinuousMeasurement ..........................................................12
7.BackLightFunction ..........................................................................13
8.Battery&FuseReplacement ............................................................14
8-1BatteryReplacement ....................................................................14
8-2FuseReplacement ........................................................................14
9.NotesonAccessories .........................................................................15
9-1 HowtoFitStrapBelt&TestProbePouch ...................................15
10. CleaningoftheInstrument ...................................................................16
11. Service .................................................................................................16

― 1 ―
1.SafetyPrecautions
○Theinstrumentisdesignedandtestedinaccordancewiththefollowing
standardsandsuppliedinthebestcondition.
・IEC61010-1 OvervoltageCAT.Ⅲ300VPollutionDegree2
・IEC61010-2-31 Safetyrequirementsforhand-heldprobeassemblies
・IEC61557-1/2/4
Measuringequipmentforlowvoltagedistributionsystems
・IEC60529（IP54） Dust＆ dripproof
・IEC61326 EMC
Thisinstructionmanualcontainswarningsandsafetyruleswhichmustbe
observedbytheuserto ensuresafetyoperation oftheinstrument andto
retainitinsafecondition.Therefore,readthroughtheseinstructionsbefore
usingtheinstrument.
WARNING
●Readthroughandunderstandinstructionscontainedinthis manual
beforeusingtheinstrument.
●Saveandkeepthemanualhandytoenablequickreferencewhenever
necessary.
●Theinstrumentmustonlybeusedbyacompetenttrainedpersonand
operatedinstrictaccordancewiththeinstructions.KYORITSUwillnot
acceptanyliabilityforanydamageorinjurycausedbymisuseornon-
compliancewiththeinstructionsorsafetyprocedures.
●Itisessentialtounderstandthesafetyrulescontained inthemanual.
Theymustbeobservedwhenusingtheinstrument.
Besuretoobservetheaboverulesstrictly.Notfollowingthe
instructionsmaycauseinjuryorinstrumentdamage.
○Thesymbol on the instrument meansthat the user mustreferto the
relevantsectionofthismanualforsafeoperationoftheinstrument.There
arethreekindsofthesymbol .Readthe instructionsfollowingeach
symbolcarefully.
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 minor
injuryorinstrumentdamage.

― 2 ―
DANGER
●Donotusethisinstrumentonenergized(LIVE)circuits.
● Donotmakemeasurementinthepresenceofflammablegasses.
Otherwise,theuseoftheinstrumentmaycausesparkling,whichleads
toanexplosion.
● Alwayskeepyourfingersbehindthebarrierontestprobeduring
measurement.
● Neverusetheinstrumentifitssurfaceoryourhandiswet.
● Never open the battery compartment cover while making
measurement.
WARNING
●Neverattempt tomakeany measurement,ifthe instrument hasany
structuralabnormalitysuchascrackedcaseorexposedmetalparts.
●Neverchangerangeswithtestprobeconnectedtotheequipment
undertest.
●Donotinstallsubstitutepartsorperformanyunauthorizedmodification
oftheinstrument.ReturntheinstrumenttoKyoritsuoryourdistributor
forserviceandrepairtoensurethesafetyfeaturesaremaintained.
●Donotreplacebatterieswhenthesurfaceoftheinstrumentiswet.
●Makesuretodisconnectthetestprobefromtheinstrumentbefore
openingthebatterycompartmentcoverforbatteryreplacement.
CAUTION
●Alwaysmakesure tosetthe rangeselectorswitchtothe appropriate
positionbeforemakingmeasurements.
●Donotexposetheinstrumenttothedirectsun,dewfallorextreme
temperatureandhumidity.
●Whentheinstrumentwillnotbeinuseforalongperiodoftime,placeit
instorageafterremovingbatteries.
●Useadampclothsoakedinwaterorneutraldetergentforcleaningthe
instrument.Donotuseabrasivesorsolvents.

― 3 ―
2.Features
MODEL-3131Aisan analogueinsulation testerwith fiverangesforinsulation
resistancemeasurementandcontinuitytesting(resistancetests) of low voltage
installations.
●Designedtosafetystandards:
IEC61557-1(Generalrequirementsformeasuringequipmentforlowvoltage
distributionsystems)
IEC61557-2(Equipmentforinsulationresistancemeasurementforlow
voltagedistributionsystems)
IEC61557-4(Equipmentforresistancetestsforlowvoltagedistribution
systems)
●DustanddripproofconstrutiontoIP54
●Threeinsulationtestranges:250V/100MΩ,500V/200MΩ,1000V/400MΩ
●Twocontinuitytestranges:2Ω,20Ω
●Backlightfunctiontofacilitateworkatnightordimlylitlocations
●Easyforbatterycheck
●Power-onindicationLEDlightingduringbatterycheckandmeasurement
●LivecircuitwarningindicationwithLEDlightingandthebuzzersound
●Fuseprotected.
●Colorcodedscalesandrangeswitchpositionforeasyreading
●Usesonly6× 1.5VbatterytypeR-6,AAorequivalent

― 4 ―
3.Specifications
●Measuring Range and Accuracy (at23±5°C,relativehumidity45-75%)
InsulationResistanceRanges:(IEC61557-2)
NominalOutputVoltage 250V 500V 1000V
MeasuringRanges
Open-Circuit
Voltage
Short-Circuit
Current
Nominal Current
Accuracy
0-100MΩ
250VDC+20%max.
1.3mAapprox
1mADCmin.
at0.25MΩ
±5%ofindicatedvalue
at0.1MΩ-10MΩ
±0.7%ofscalelengthatrangesotherthanaboveranges
0-200MΩ
500VDC+20%max.
1mADCmin.
at0.5MΩ
±5%ofindicatedvalue
at0.2MΩ-20MΩ
0-400MΩ
1000VDC+20%max.
1mADCmin.
at1MΩ
±5%ofindicatedvalue
at0.4MΩ-40MΩ
ContinuityTest(ResistanceTest)Ranges:(IEC61557-4)
Ranges
MeasuringRanges
xΩ
0-2Ω
x10Ω
0-20Ω
Open-Circuit Voltage
Measuring Current
Accuracy
ZeroAdjustmentRange
4-9VDC
200mADCmin.
±3%ofscalelength
0.2Ω min.
Ranges
250V/100MΩ
500V/200MΩ
1000V/400MΩ
Measuringrangetokeepoperatingerror Maximumpercentageoperatingerror
0.1MΩ -10MΩ
±30%0.2MΩ -20MΩ
0.4MΩ -40MΩ
Ranges
xΩ
x10Ω
Measuringrangetokeepoperatingerror Maximumpercentageoperatingerror
0.2Ω -2Ω ±30%
2Ω -20Ω
Operating Error
InsulationResistanceRanges(IEC61557-2)
ContinuityTest(ResistanceTest)Ranges(IEC61557-4)
Theinfluencingvariationsusedforcalculatingtheoperatingerroraredenotedasfollows:
Temperature :0°Cand35°C
Supplyvoltage :6.5Vto10.4V
Position :Referenceposition±90°
※Priortomeasurement,applyZeroAdjustmentateachposition

― 5 ―
Typical Number of Measurements (centraltendencyforsupplyvoltageupto
6.5V)
InsulationResistanceRanges:
1000V/400MΩ Range Approx.500timesmin.
500V/200MΩRange Approx.1300timesmin.
250V/100MΩ Range Approx.1800timesmin.
ContinuityTest(ResistanceTest)Ranges:
xΩ Range/x10Ω Range Approx.1000timesmin.
Applicable Standards
IEC61010-1 OvervoltageCAT.Ⅲ300VPollutionDegree2
IEC61010-2-31 Safetyrequirementsforhand-heldprobeassemblies
IEC61557-1/2/4
Measuringequipmentforlowvoltagedistributionsystems
IEC61326 EMC
IEC60529(IP54) Dust&dripproof
Operating Temperature & Humidity:
0-40°C,relativehumidityupto85%
Storage Temperature & Humidity:
-20-60°C,relativehumidityupto85%
Insulation Resistance Morethan50MΩat1000VDCbetween
electricalcircuitandhousingcase
Withstand Voltage 3700VACforoneminutebetweenelectrical
circuitandhousingcase
Overload Protection
Insulationresistanceranges: 1000VRange 1200V (DC+ACp-p) for10seconds
500VRange 600V(DC+ACp-p)for10seconds
250VRange 300V(DC+ACp-p)for10seconds
Continuityranges: xΩ/x10ΩRange 280V(DC+ACp-p)for10seconds
Dimensions: 185(L)x167(W)x89(D)mmapprox.
Weight: 860gapprox.(includingbatteries)
Power Source:
6x1.5VbatterytypeSUM-3,R-6,AAorequivalent
Accessories TestProbeMODEL7122 x1set
Strapbelt x1
Testprobepouch x1
R6P AAbatteries x6
SparefuseF500mA/600V x1
Instructionmanual x1

― 6 ―
4.InstrumentLayout
①METERMOVEMENTZEROADJUST ②TESTBUTTON
③SCALEPLATE ④LIVECIRCUITWARNINGLED
⑤POWER-ONINDICATIONLED ⑥CONTINUITYZEROADJUST
⑦LIGHTSWITCH ⑧RANGESELECTORSWITCH
⑨TESTPROBE(RED)LINEPROBE ⑩TESTPROBE(BLACK)EARTHPROBE
⑪TESTPROBECAP(RED) ⑫TESTPROBECAP(BLACK)
⑬ALLIGATORCLIP(BLACK)
Fig.1 Partnames
①
② ⑧ ⑦
⑥
⑤
④
③
⑨
⑪
⑬
⑫
⑩

― 7 ―
5.PreparationforTesting
5-1RemovingtheCover
Model3131Ahas adedicatedcovertoprotect againstanimpactfrom
theoutside andprevent theoperation part,and theconnectorsocket
frombecomingdirty.
Removethecoverandputitonthebacksideofthemainbodytomake
measurements.
5-1-1Methodofremovingthecover
5-1-2Methodofhousingthecover
Fig.2
Fig.3

― 8 ―
5-2MechanicalZeroAdjustment
Checkthatthepointerlinesupwiththemiddleofthemarkonthescale
correctly.Ifnot,adjustitbyrotatingthemetermovementzeroadjustwith
ascrewdriver,etc.
5-3BatteryVoltageCheck
①SettherangeselectorswitchtoBATT.CHECKposition.
②Pressthetestbutton.
③Thenthepointerdeflects.JudgethebatterystatuswithBATT.GOOD
markonthescaleplate.
IfthepointerdoesnotmovetoBATT.GOODmark,the batteriesare
exhausted.Replacethemwithnewbatteriesaccordingtosection8for
battery&fusereplacement.
5-4TestProbeConnection
Insertthetestprobefullyintotheterminaloftheinstrument.
Connecttheearthclipofthetestprobe(black)toEARTHterminaland
thelineprobe(red)toLINEterminaloftheconnectorterminal.
5-5TestProbeCheck
SettherangeselectorswitchtoxΩ positionandpressandturntheTest
buttontolockitdown.Whenthetestprobeareconnectedtogether,the
pointershouldmovefromthe∞ positiontowardsthe０positiononthe
bluecontinuityscale.Ifnot,theprobeorfusemaybefaulty.Releasethe
Testbuttonaftercompletion.
CAUTION
Donotkeepthetestbuttonpressedorlockedbyturningitclockwiseduring
batterycheck.

― 9 ―
6.Operation
6-1 Disconnectionandcheckofpowersourceofcircuitundertest
DANGER
●Toavoidpossibleelectricalshock,donotperformmeasurementson
energized(LIVE)circuits.
●Nevermakemeasurementswiththebatterycompartmentcover
removed.
CAUTION
●Neverpressthe testbutton ifthe livecircuitwarningLEDislitorthe
warningbuzzersounds.Thismaydamagethecircuit.
Voltagecheckcanbemadewiththerangeselectorswitchatanyposition.
Besuretoturnoffthebreakerforthecircuitundertest.
①Connecttheearthclipofthetestprobe(black)totheearthsideandthe
lineprobe(red)tothelinesideofthecircuitundertest.
②EnsurethatthelivecircuitwarningLEDisnotlitandtheaudiblewarning
isnotpresent.IftheLEDislitandthebuzzersounds,neverpressthetest
button.Voltage is generatedinthe circuit undertest. Recheckthat the
breakerforthecircuitundertestis"OFF".
Fig.4
CAUTION
Neverpress testbutton
E L

― 10 ―
6-2InsulationResistanceMeasurement
DANGER
●Alwaystest the circuit or equipment to ensureitissurely de-energized
beforemeasurementaccordingtotheinstructionof6-1.
●Toavoidelectricalshock,measurementsmustbeperformedonde-
energizedcircuitsonly.
●Whenthetestbuttonis pressedwith therange selectorswitchin the
insulationposition,takecarenottotouchthetipofthetestprobeandthe
circuitundertestwhereahighvoltageispresentinordertoavoid
possibleshockhazard.
●Nevermakemeasurementwiththebatterycompartmentcoverremoved.
CAUTION
●Neverpressthe testbutton ifthe livecircuitwarningLEDislitorthe
warningbuzzersounds.Thismaydamagethecircuit.
Conductthevoltagewarningcheckbeforemeasurementtoensurethat
thecircuitundertestisde-energized.
①Checkthevoltagewhichcanbeappliedtothecircuitundertestandset
therangeselectorswitchtothedesirednominaloutputvoltagerange.
②Connecttheearthclipofthetestprobe(black)totheearthterminalofthe
circuitundertest.
③Putthetipofthelineprobe(red)tothecircuitundertestandpressthe
testbutton.
④Readthescaledirectlyforthe500Vrange,multiplyby0.5for250Vand
by2for1000V.
Fig.5 Insulationresistancemeasurement
Connectearthprobe
toearthterminal
CAUTION
Alwaysturnoffbreaker
forcircuitundertest
beforeinsulationtest

― 11 ―
DANGER
Donot touch the circuit undertestimmediately after testing. Capacitance
storedinthecircuitmaycauseelectricshock.
Leavethetestprobeconnectedtothecircuitandnevertouchthecircuituntil
thedischargeiscompleted.
PrincipleofInsulationResistanceMeasurement
Resistancevaluecanbeobtainedbyapplyingacertainhighvoltagetothe
resistance(insulationresistance)andmeasuringtheflowingcurrent.
ResistanceValue=Voltage/Current
RX=V/I
6-3ContinuityTesting(ResistanceTests)
DANGER
●Alwaystest the circuit or equipment to ensureitissurely de-energized
beforemeasurementaccordingtotheinstructionof6-1.
●Toavoidelectricalshock,measurementsmustbeperformedonde-
energizedcircuitsonly.
●Nevermakemeasurementwiththebatterycompartmentcoverremoved.
CAUTION
●Neverpressthe testbutton ifthe livecircuitwarningLEDislitorthe
warningbuzzersounds.Thismaydamagethecircuit.
Conductthevoltagewarningcheckbeforemeasurementtoensurethat
thecircuitundertestisde-energized.
●Incasethatanadditionaloperatingcircuitisconnectedinparalleltothe
circuitundermeasurement,themeasurementerrormightbecauseddue
totheeffectsofimpedanceofthecircuitconnetedinparallelortransient
current.
EARTH（＋）
LINE（−）
VOLTAGE:V RESISTANCE
VALUE:RX
CURRENT:I

― 12 ―
PrincipleofContinuityTesting(ResistanceTest)
Resistancevaluecanbeobtained byapplyingacertaincurrenttothe
resistanceunder test and measuringthevoltage generated on the both
sidesoftheresistanceundertest.
ResistanceValue=Voltage/Current
RX=V/I
6-4ContinuousMeasurement
Alockdown featureisincorporatedonthetestbutton. Pressingand
turningitclockwise,lockthetestbuttoninthecontinuousoperating
position.
Toreleasethelockturnthetestbuttoncounterclockwise.
DANGER
Beextremely careful not to get electric shock during insulationresistance
measurementashighvoltageispresentonthetipofthetestprobe
continuously.
①SettherangeselectorswitchtothedesiredpositionxΩorx10Ω.
②Shortthelineprobe(red)andtheearthclipofthetestprobe(black)and
pressthetestbutton.Adjusttheohmzeroadjusttozerothepointeron
thescale.
③Connectthetestprobestothecircuitundertestandpressthetestbutton.
④ReadthescaledirectlyforxΩrange,multiplyby10forx10Ωrange.
Fig.6
continuity
EARTH（−）
LINE（＋）
VOLTAGE:V
RESISTANCE
VALUE:RX
CURRENT:I

― 13 ―
7.BackLightFunction
Tofacilitate working at night or dimly lit situations,abacklight function is
providedwhichilluminatesthedisplay.
Tooperatethisfunction,thebacklightbuttonmustbepressedandreleased
whilepressingthetestbutton.Thebacklightcontinuesilluminatingfor
approx.40secondsandthenturnoffautomatically.
Whenthetestbuttonisreleased,thebacklightwillturnoffevenwithinthe
lightingtime.
Fig.7 Howtousethebacklightbutton

― 14 ―
8.Battery&FuseReplacement
8-1BatteryReplacement
①Disconnectthetestprobefromtheinstrument.
②Openthebatterycompartmentcoverbyunscrewingthemetalcaptive
screwtorevealbatterycompartment.Alwaysreplaceallsixbatteries
withnewonesatthesametime.
Batterytype:6x1.5VbatterytypeSUM-3,R-6,AAorequivalent
8-2FuseReplacement
①Disconnectthetestprobefromtheinstrument.
②Openthebatterycompartmentcoverbyunscrewingthemetalcaptive
screwtorevealbatterycompartmentandreplacethefuse.
Fusetype:F500mA/600Vfastactingceramicfuseφ6.35x32mm
Installbatteriesincorrectpolarityasmarkedinsidethecase.
DANGER
●Neveropenthebatterycompartmentcoverwhilemakingmeasurement.
Toavoidpossible electricalshock,disconnectthetest probebefore
openingthecoverforbatteryandfusereplacement.
●Replacementfusemusthavethefollowingrating.
Fastactingtype,F500mA/600V,φ6.35×32mm
Fig.8 Howtoreplacebatteriesandfuse
SPAREFUSE
SCREW
FUSE
BATTERY

― 15 ―
9.NotesonAccessories
9-1HowtoFitStrapBeltandTestProbePouch
Byhanging theinstrumentaround theneck,both handscan be used
freelyforeasyandsafetyworking.
①Howtofitthestrapbelt
②Wholediagramwhenthetestprobepouchisattached
Fig.9 Howtofitthestrapbelt
Fig.10 Howtofitthetestprobepouch

― 16 ―
10.CleaningoftheInstrument
◎Cleaningthemetercover
Thisinstrumentismanagedbyourcompany'squalitystandardandis
deliveredinthebestconditionafterpassedtheinspection.Butinthedrytime
ofwinterstaticelectricitysometimesbuildsuponthemetercoverduetothe
characteristicofplastic.
Whenthe pointer deflectsbytouching the surfaceofthis instrument orzero
adjustmentcannotbemade,donottrytomakemeasurement.
Whenstaticelectricitybuildsuponthemetercoverandaffectsthemeter
reading,useaclothdampenedwithoff-the-shelfanti-staticagentordetergent
towipethemetercoversurface.
11.Service
Ifthistestershouldfailtooperatecorrectly,returnittoyournearest
distributorsstatingtheexactnatureofthefault.
Beforereturningtheunit,makesurethat:
a) probeshavebeenchecked.
b) fusehasbeenchecked.
c) batteryhasbeenchecked.
Remember,themoreinformationwrittenaboutthefault,thequickeritwillbe
serviced.

― 17 ―
ＭＥＭＯ

01-12
92-1487A
DISTRIBUTOR
KYORITSUELECTRICAL
INSTRUMENTS
WORKS,LTD．
No.5-20,Nakane2 ― chome,Meguro-ku,
Tokyo,152-0031Japan
Phone：（03）3723 ― 0131
Fax：（03）3723 ― 0152
URL：http://www.kew-ltd.co.jp
E-mail：[email protected]
Factories：Uwajima＆Ehime
R
Kyoritsureservestherightstochangespecificationsordesigns
Describedinthismanualwithoutnoticeandwithoutobligations.