KYORITSU 3321A User manual

Instructionmanual
KEWMEG series
MODEL3321A,3322A,3323A
CompactInsulationresistancetesterwith3-range
KYORITSUELECTRICALINSTRUMENTS
WORKS,LTD.

Contents
1．Safetywarnings ……………………………………………………１
2．Features ……………………………………………………………３
3．Specification ………………………………………………………４
4．Instrumentlayout …………………………………………………８
5．Preparationformeasurement
5−1 Mechanicalzeroadjustment ………………………………９
5−2 Testleadconnection ………………………………………９
5−3 Batteryvoltagecheck ………………………………………10
5−4 Power-on-indicationLED …………………………………10
6．Measurement
6−1 ACvoltagemeasurement …………………………………10
(Mainsdisconnectioncheck)
6−2 Insulationresistancemeasurement ………………………12
6−3 Continuousmeasurement …………………………………14
6−4 Outputvoltagecharacteristics ……………………………14
6−5 Usingguardterminal(onlyforMODEL3321A) …………16
6−6 Backlightfunction …………………………………………16
7．Batteryreplacement ………………………………………………17
8．NotesonHousingcaseandaccessories
8−1 Caselid ……………………………………………………18
8−2 NeckstrapandCordcase …………………………………18
8−3 Testprodsandreplacement ………………………………19
8−4 AdaptorsfortheEarthcordandreplacement …………20
8−5 CleaningMetercover ……………………………………21

―1―
１．Safetywarnings
○Thisinstrumenthasbeendesigned,manufacturedandtested
accordingtoIEC61010-1:Safetyrequirements forElectronic
Measuring apparatus, and delivered in the best condition after
passedtheinspection.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.
WARNING
¡Readthroughandunderstandtheinstructionscontainedinthis
manualbeforeusingtheinstrument.
¡Keepthemanualathandtoenablequickreferencewhenever
necessary.
¡Theinstrumentistobeusedonlyinitsintendedapplications.
¡Understandandfollowallthesafetyinstructionscontainedin
themanual.
Itisessentialthattheaboveinstructionsareadheredto.Failure
tofollowthe above instructions may causeinjury,instrument
damageand/ordamagetoequipmentundertest.
○Thesymbolindicatedontheinstrument,meansthattheuser
mustrefertotherelatedpartsinthemanualforsafeoperation
oftheinstrument.Itisessentialtoreadtheinstructions
whereverthesymbolappearsinthemanual.
DANGER ：isreservedforconditionsandactionsthatare
likelytocauseseriousorfatalinjury.
WARNING：isreservedforconditions and actionsthatcan
causeseriousorfatalinjury.
CAUTION ：isreservedfor conditionsandactions thatcan
causeinjuryorinstrumentdamage.

―2―
DANGER
¡Nevermakemeasurementonacircuitinwhichtheelectrical
potentialexceedsAC/DC600V(MeasurementCAT.III600V).
¡Donotattempttomakemeasurementinthepresenceofflammable
gasses. Otherwise, the use of the instrument may cause sparking,
whichcanleadtoanexplosion.
¡Neverattempttousetheinstrumentifit'ssurfaceoryourhandarewet.
¡Becarefulnottoshort-circuitthepowerlinewiththemetalpartofthe
testleadswhenmeasuringavoltage.Itmaycausepersonalinjury.
¡Donotexceedthemaximumallowableinputofanymeasuringrange.
¡NeveropentheBatterycoverduringameasurement.
WARNING
¡Neverattempttomakeanymeasurementifanyabnormalconditions,
such as a broken case or exposed metal parts are present on the
Instrumentandtestleads.
¡NeverpresstheTestbuttonwhileconnectingthetestleads.
¡NeverrotatetheRangeswitchwiththetestleadsconnectedtothe
equipmentundertest.
¡Donotinstallsubstitutepartsormakeanymodificationtothe
instrument.ReturntheinstrumenttoyourlocalKYORITSU
distributorforrepairorre-calibrationincaseofsuspectedfaulty
operation.
¡Nevertouchthecircuitundertestduring/immediatelyafterthe
insulationresistancemeasurement.Thetestvoltagemaycause
electricalshock.
¡Donotreplacebatteriesiftheinstrumentiswet.
¡Ensurethatthetestleadsarefirmlyinsertedintotheterminal.
¡SettheRangeswitchtoOFFpositionwhenopeningtheBattery
coverforbatteryreplacement.
CAUTION
¡AlwayssettheRangeswitchtotheappropriatepositionbefore
makingmeasurement.
¡SettheRangeswitchto"OFF"positionafteruseandremovethetest
leads.Theinstrumentconsumesmallcurrentatanyrangeother
thanOFF,anditshortensthebatterylife.Removethebatteriesifthe
instrumentistobestoredandwillnotbeinuseforalongperiod.
¡Donotexposetheinstrumenttodirectsunlight,hightemperatures,
humidityordew.
¡Useadampclothwithneutraldetergentforcleaningtheinstrument.
Donotuseabrasivesorsolvents.
¡Donotstoretheinstrumentifitiswet.Storeitafteritdries.

―3―
２．Features
MODEL3321A/3322A/3323Aarethree-rangeinsulationresistance
testersfortestinglow-voltageinstallationbelow600V.
¡Designedtofollowingsafetystandards:
IEC61010-1,IEC61010-031,IEC61557
¡Smallandlightweight.
¡Auto-dischargefunction
Wheninsulation resistance like a capacitive load ismeasured,
electricchargesstoredincapacitivecircuitsareautomatically
dischargedaftermeasuring.Dischargecanbecheckedwiththe
meter.
¡Color-codedscalesforeasyandcorrectreading
¡Power-onindicatoroninsulationresistanceandbatterycheck
ranges.
¡Backlightfunctiontofacilitateworkingatdimlyilluminated
locationoratnighttimework.
¡ACvoltagemeasurementfunction
MeasuresACvoltageonallrangeswithoutpressingtheTest
button
¡Testleadswithremotecontrolswitch
(voltagewon'tbeoutputtedwhenthetestleadisnotconnected.)
¡Robusthousingcase
¡Neckstrapforbothhand'soperation
¡User-changeabletestprod

¡
Applicablestandards
IEC61557
IEC61010-1MeasurementCAT.III600VPollutiondegree2
ProtectionclassII
Locationforuse:altitude2000morless
IEC61010-031
IEC60529 IP40
¡
Measuringrangeandaccuracy
<Insulationresistancerange>
MODEL3321A
*Heavy-linecirculararconthescaleindicatestheprimaryeffective
measuringranges.(guaranteedaccuracyrange)
MODEL3322A
*Heavy-linecirculararconthescaleindicatestheprimaryeffective
measuringranges.(guaranteedaccuracyrange)
―4―
３．Specification
Nominalvoltage
Max.effectivescalevalue
Mid-scalevalue
Accuracyinprimary
effectivemeasuringranges
Accuracyinprimary
effectivemeasuringranges
Accuracyat0and∞
Accuracyatno-load
voltage
Nominalcurrent
Short-circuitcurrent
250V
50MΩ
1MΩ
0.05〜20MΩ
within±5%ofindicatedvalue
Measuringrangesotherthanabove,0and∞.
within±10%ofindicatedvalue
within±0.7%ofscalelength
0%〜+20%ofnominalvoltage
1mA0%〜+20%
within1.5mA
500V
100MΩ
2MΩ
0.1〜5MΩ
1000V
2000MΩ
50MΩ
2〜1000MΩ
Nominalvoltage
Max.effectivescalevalue
Mid-scalevalue
Accuracyinprimary
effectivemeasuringranges
Accuracyinprimary
effectivemeasuringranges
Accuracyat0and∞
Accuracyatno-load
voltage
Nominalcurrent
Short-circuitcurrent
125V
20MΩ
0.5MΩ
0.02〜10MΩ
within±5%ofindicatedvalue
Measuringrangesotherthanabove,0and∞.
within±10%ofindicatedvalue
within±0.7%ofscalelength
0%〜+20%ofnominalvoltage
1mA0%〜+20%
within1.5mA
250V
50MΩ
1MΩ
0.05〜20MΩ
500V
100MΩ
2MΩ
0.1〜50MΩ

―5―
MODEL3323A
*Heavy-linecirculararconthescaleindicatestheprimaryeffective
measuringranges.(guaranteedaccuracyrange)
<Operatingerror>
Operatingerror(B)isanerrorobtainedunderthenominal
operatingconditions,andcalculatedwiththeintrinsicerror (A),
whichisanerroroftheinstrumentused,andtheerror(En)dueto
variations.According to IEC61557, the maximum operatingerror
shouldbewithin+/-30%.
Ｂ＝︱Ａ︱＋ 1.15× √
（Ｅ
12＋Ｅ 22＋Ｅ 32）
Ａ： Intrinsicerror(%)
Ｂ：Operatingerror(%)
Ｅ1：Variationduetochangingthetemperature(%)
Ｅ2：VariationduetochangingtheBatteryvoltage(%)
Ｅ3：Variationduetochangingtheposition(%)
Nominaloperatingconditions
Ambienttemperature:0〜40℃
Relativehumidity :90%orless
Externalmagneticfield:400A/morless
Position :Horizontal〜±90°
Batteryvoltage :within"BATTERY.GOOD"range
Nominalvoltage
Max.effectivescalevalue
Mid-scalevalue
Accuracyinprimary
effectivemeasuringranges
Accuracyinprimary
effectivemeasuringranges
Accuracyat0and∞
Accuracyatno-load
voltage
Nominalcurrent
Short-circuitcurrent
25V
10MΩ
0.2MΩ
0.01〜5MΩ
within±5%ofindicatedvalue
Measuringrangesotherthanabove,0and∞.
within±10%ofindicatedvalue
within±0.7%ofscalelength
0%〜+20%ofnominalvoltage
1mA0%〜+20%
within1.5mA
50V
10MΩ
0.2MΩ
0.01〜5MΩ
100V
20MΩ
0.5MΩ
0.02〜10MΩ

―6―
<ACvoltagerange>
<Numberofmeasurement>
Possiblenumberof measurement within the "BATTERY.GOOD"
range.(Measure5sec.,andtakepausefor25sec.)
Temperature&humidity :0℃〜40℃ (RH:85%orless)
range (nocondensation)
Storagetemperature& :-20℃〜＋60℃ (RH:75%orless)
humidityrange (nocondensation)
Responsetime :Meterreadingcomeswithinaccuracy
within3sec.afteraresistance
correspondingtothemid-scalevalue
and0Ω issuddenlyappliedacross
themeasuringterminals.
(Itmaytaketimewhenmeasuringa
capacitiveload.)
Insulationresistance :atleast100MΩ/DC1000Vbetween
theelectricalcircuitandtheenclosure
Withstandvoltage :
AC5,550V(50/60Hz)for1min.between
theelectricalcircuitandtheenclosure
Measuredvoltage
Accuracy
0〜600V
within±3%ofmaxscalevalue
(
ACVrange)
within±5%ofmaxscalevalue
(
Others)
Range
25
V/10MΩ
50 V/ 1
0MΩ
100 V/ 2 0MΩ
125 V/ 20 MΩ
250 V/
50 MΩ
500 V/ 100 MΩ
1000V/2000MΩ
0.025MΩ
0.05MΩ
0.1MΩ
0.125MΩ
0.25MΩ
0.5MΩ
1MΩ
atleast4000times
atleast3500times
atleast3000times
atleast2500times
atleast2000times
atleast1000times
atleast300times
Possiblenumber
ofmeasurement
Resister
fortest

―7―
¡Overloadprotection
Theinstrumentoperatesproperlyaftereachofthevoltageshown
inthetablebelowisappliedfor10sec.
Dimension :approx.105(L)x158(W)x70(D)mm
Weight :approx.520g(includingbatteries)
Powersource :R6P(SUM-3),AA,x6pcs
Nominalpower :3.5VA
Accessories
MODEL7103Testleadwithremotecontrolswitch1set
MODEL7081Guardcord(OnlyforMODEL3321A) 1pce
MODEL7101Flattestbar 1pce
MODEL7131Safetyalligatorclip 1pce
MODEL8017Extensionprod 1pce
Neckstrap 1pce
Cordcase 1pce
R6P(SUM-3),sizeAA 6pcs
Instructionmanual 1pce
Optional
MODEL7115Extensionprobe
MODEL8016Pickletypeprod
Pickletypeprod
Extensionprobe
3321A
1000Vrange:AC1200V
Theotherranges:AC600V
AC1200V
MODEL
Insulation
resistance
ACvoltage
3322A
Allranges:
AC600VAC
720V
3323A
Allranges:
AC360VAC
720V

―8―
①Meterzeroadjuster ②Testbutton
③Scaleplate ④Pointer
⑤Insulationresistancescale ⑥ACvoltagescale
⑦"BATTERY-GOOD"range ⑧Power-on-indicationLED
⑨Guardterminal ⑩Probesocket
⑪Backlightswitch ⑫Rangeswitch
⑬Testleadwithremotecontrolswitch(MODEL7103)
⑭Remotecontrolswitch ⑮Lineprobe
⑯Earthcord ⑰Standardprod(MODEL8072)
⑱Probeconnector ⑲Flattestbar(MODEL7101)
⑳Safetyalligatorclip(MODEL7131)
○
21 Extensionprod(MODEL8017)
○
22 TestleadforGuardterminal(MODEL7081)
※Item⑨and○
22 areonlyforMODEL3321A.
４．Instrumentlayout
Fig.1Instrumentlayout

―9―
5−1Mechanicalzeroadjustment
WiththeRangeswitchsettotheOFFpositionandwithout
pressingtheTestbutton,turntheZeroadjusterwitha
screwdriversothatthepointerlinesupwiththe"∞"markonan
insulationresistancescale.Incasetheinstrumentisusedatthe
slopingplace,ensurethatthepointerlinesupwiththe"∞"mark
tiltingtheinstrumenttothenecessaryangle.
5−2Testleadconnection
InserttheProbeconnectorintotheProbesocketonthe
instrumentcorrectlyasshownbelow.
Probesocket
Probeconnector
５．Preparationformeasurement
DANGER
WhentheTestbuttonortheRemotecontrolswitchispressed
withthe Range switch settoaninsulationresistance range,
takecarenottotouchthetipoftheTestprobewhereahigh
voltageispresentinordertoavoidpossibleshockhazard.

―10―
5−3Batteryvoltagecheck
(1)SettheRangeswitchtotheBATT.CHECKposition.
(2)PresstheTestbuttonorRemotecontrolswitch.
(3)IfthemeterpointerdoesnotmovetoBATTGOOD,replace
thebatteriesasshowninSection7"Batteryreplacement".
CAUTION
Neverkeep the Test buttonpressed or locked duringbattery
checktoavoidbatterypowerdrain.
5−4Power-on-indicationLED
OnaninsulationresistancerangeorBATT.CHECKrange,
whentheTestbuttonorRemotecontrolswitchispressed,the
power-on-indicationLED(red)lightsup,indicatingthe
instrumentisintheoperationmode.
Batterieshaveexhausted.
Replacethebatteries.
Proceedtomeasurement.
6−1ACvoltagemeasurement(Mainsdisconnectioncheck)
TheACvoltagemeasurementfunctionisavailableonany
ranges.
(1)ConnecttheEarthprobetotheearthofthecircuitundertest
andLineprobetotheotherside.Ifthecircuitisnotearthed,
connectEarthprobetoanyappropriateconductor.
(2)Withoutpressing the Test button orRemote control switch,
takethereadingontheACvoltagescale.
６．Measurement

―11―
ACvoltagemeasurement(Mainsdisconnectioncheck)
TheACvoltagemeasurementfunctionisavailableonanyranges.
DANGER
¡Nevermakemeasurementonacircuitinwhichtheelectrical
potentialexceedsAC/DC600Vinordertoavoidpossible
shockhazard.
(RefertoSection3."Specification,ACvoltagemeasurement.)
¡Whentestinginstallationthathasalargecurrentcapacity,
suchasapowerline,besuretomakemeasurementonthe
secondarysideofacircuitbreakerinordertoavoidpersonal
injury.
¡DonotpresstheTestbuttonorRemotecontrolswitchduring
voltagemeasurement.
¡Nevershortlive conductors with the tip of aprobetoavoid
personalinjury.
¡DonotmakemeasurementwiththeBatterycoverremoved.
<SimplifiedmeasurementofDCvoltage>
ThisinstrumentalsoprovidessimplifiedmeasurementofDC
voltage.Multiplying0.9bytheindicatedvalueatACvoltagescale
providestheDCvoltagevalue.However,thepolarityisn't
indicated.
DCvoltage(V)=IndicatedvalueatACvoltagescalex0.9(V)
CAUTION
Neverpress
testbutton
CAUTION
Neverpress
remoteswitcth

―12―
6−2Insulationresistancemeasurement
Beforeperforminganyinsulationtest,checkthemaximum
voltagethatmaybeappliedtothecircuitundertest.
Note:
¡Somecircuitshaveanunstableinsulationresistance,which
causesthereadingtovaryduringmeasurement.
¡Theinstrument may generate ahighpitchtoneduring
measurement.Thisisnotafailure.
¡If the circuit under test has a large capacitive load, it may take
sometimebeforethefinalreadingcanbeobtained.
¡Oninsulation resistance range, DC voltage issupplied through
EarthandLineprobes,withEarthprobehavingpositivepolarity.
Earthprobe should be connectedto the earth conductor inthe
circuitundertest.Suchconnectionisknowntobemoresuitable
forinsulationtestssinceaninsulationresistancevaluemeasured
withthepositivesideconnectedtoearthistypicallylessthanthat
takenthroughthereversedconnection.
DANGER
¡Whenthe Testbuttonor Remotecontrolswitch ispressed
withtheRange switch set to an insulation resistancerange
position,takecarenottotouchthetipofthetestprobeorthe
circuitundertestwhereahighvoltageispresentinorderto
avoidpossibleshockhazard.
¡DonotmakemeasurementwiththeBatterycoverremoved.
CAUTION
Ensurethatthe circuitundertestisde-energizedpriortoany
insulationtesting.
(1)Checkthemaximumvoltage thatmaybeappliedtothecircuit
undertest.SettheRangeswitchtoadesiredinsulation
resistancerange.

―13―
(2)ConnectEarthprobe to the earth terminalofthe circuit under
test.Ifthecircuitisnotearthed,connectEarthprobetoany
appropriateconductor.
(3)ConnectLineprobetothecircuitundertestandpresstheTest
buttonorRemotecontrolswitch.
(4)Takethereadingonthescalefortheselectedinsulation
resistancerange.
(5)ReleasetheTestbuttonorRemotecontrolswitchandleavethe
probesconnectedtothecircuitundertesttodischargecharges
storedinthecapacitanceofthecircuit.
DANGER
¡Donot touch the circuit under test immediately after testing.
Chargesstoredinthecapacitanceofthecircuit may cause
electricalshock.
¡Leavetheprobesconnectedtothecircuitundertestuntilthe
pointerreturns to the left endofthe scale. Never touch the
circuitbeforethedischargingcompletes.
ConnectsideEarthterminal
sourceside
Loadside
Circuitbreaker
CAUTION
Makesuretoturn
offthecircuit
breaker.
Remotecontrolswitch
Pressthetestbuttonorremotecontrolswitch.
SelectrangeTestbutton

―14―
<Autodischargefunction>
Thisfunctionallowselectricchargesstoredinthecapacitanceof
thecircuitundertesttobeautomaticallydischargedafter
testing.DischargecanbemonitoredbytheACvoltagereading.
(6)SettheRangeswitchtotheOFF
position,and disconnect the probes
fromtheinstrument.
6−3Continuousmeasurement
For continuous measurement, a lock-down feature is
incorporatedontheTestbutton.Pressingandturningclockwise
locksthebuttonintheoperatingposition,thebuttonisreleased
byturningitcounterclockwise.
DANGER
WhiletheTestbuttonislockeddown,ahighvoltageispresent
atthetipofaprobe.Attentionshouldbepaidtoavoidpossible
shockhazard.
6−4Outputvoltagecharacteristics
Thisinstrument conforms to IEC61557. Thisstandard defines
thatthe nominal current shall beatleast 1mA, and the lower
limitoftheinsulationresistancemaintainingthenominalvoltage
atthemeasurementterminal.(Seethegraphbelow.)
Thisvalueiscalculatedbydividingthenominalvoltageby
nominalcurrent.i.e.,incasethatthenominalvoltageis500V,
thelowerlimitoftheinsulationresistanceisfoundasfollows.
Divide500Vby1mAequals0.5MΩ
Thatis,insulation resistance of 0.5MΩ or moreisrequired to
providethenominalvoltagetotheinstrument.
Nominalvoltage
0.025
MΩ
25V
0.05
MΩ
50V
0.1
MΩ
100V
0.125
MΩ
125V
0.25
MΩ
250V
0.5
MΩ
500V
1
MΩ
1000V
Lowerlimitofinsulation
resistancetosupply
nominalcurrent
(
1mA
)

―15―
OutputVoltage[V]OutputVoltage[V]OutputVoltage[V]
range
range
range
range
range
range
range
range
range
InsulationResistance[MΩ]
InsulationResistance[MΩ]
InsulationResistance[MΩ]

―16―
6−5 UsingGuardTerminal(onlyforMODEL3321A)
Shownbelowisanexampleoftheinsulationresistance
measurementofanelectricwire.IfLineprobeissimply
connectedtothewireconductorandEarthprobetothewoven
metalshieldasshown,ameasurementerrorwillbeintroduced
asthisresultsinthemeasurementofthecombinedresistance
ofinsulation resistance and thesurface leakage resistance at
thecutendoftheelectricwire.Inordertoremovethissurface
leakagecurrent, wind a guardwire around the cutend of the
conductorandconnectittotheguardterminaloftheinstrument
usingGuardConnectionlead.Then,thesurfaceleakage
currentwillbypassthemeteroftheinstrument.
6−6 Backlightfunction
Tofacilitateworkingindimlylitsituations,abacklightfunctionis
providedwhichilluminatesthescaleplate.Pressthebacklight
switchtooperatethisfunction.Thebacklightwilllightupfor
about60sec.,andthenturnedoffautomatically.
Meter
Voltage
Generator LeakageCurrent
CoreConductor
Insulation
GuardWire
Sheathed
Cable
InsulalionResistanceTester

―17―
DANGER
NeveropentheBatterycoverduringameasurement.
WARNING
Toavoid possible electric shock, remove test leads before
openingtheBatterycover.Afterreplacingbatteries,besure
totightenupthescrewsforBatterycover.
CAUTION
Donotmixnewandoldbatteries.
Installbatteriesincorrectpolarityasmarkedinsidethe
Batterycompartment.
(1) SettheRange switch to "OFF" position, and removethetest
leadsfromtheinstrument.
(2) LoosentheBattery-cover-fixingscrews,andremovetheBattery
cover.Alwaysreplaceall6batterieswithnewoneatthesame
time.
(3) Afterreplacing batteries, be sureto tighten up the screws for
Batterycover.
7．Batteryreplacement
Battery-compartment-cover-fixingScrews
Installbatteriesincorrect
polarityasmarkedinside
thebatterycompartment.

―18―
8−1Caselid
CaselidcanbefitundertheHousingcasewhilemaking
measurement.
(1)UnhookandopentheCaselid.
(2)Turnit180degrees.
(3)PuttheCaselidundertheHousingcase.
(4)HookitontotheHousingcase.
8−2NeckstrapandCordcase
Thisinstrumentisequippedwithastraptosuspendfromthe
neck to allow both hands to be used freely for easy and safe
operation.
8．NotesonHousingcaseandaccessories