KYORITSU KEW 3022 User manual

Instructionmanual
INSULATION-CONTINUITYTESTER
KEW302130223023
KYORITSUELECTRICALINSTRUMENTS
WORKS,LTD.

Contents
1．Safetywarnings ……………………………………………………１
2．Features ……………………………………………………………３
3．Specification ………………………………………………………４
4．Instrumentlayout …………………………………………………８
5．Preparationformeasurement ……………………………………９
5−1 Testleadconnection ………………………………………９
5−2 ChecksonTestleadandFuse ……………………………９
6．Measurement ……………………………………………………10
6−1 Voltagemeasurement(Mainsdisconnectioncheck) ……10
6−2 Insulationresistancemeasurement ………………………10
6−3 Continuousmeasurement …………………………………13
6−4 Outputvoltagecharacteristics ……………………………13
6−5 Measurementofresistance(Continuitycheck) …………14
6−6 Backlightfunction …………………………………………15
6−7 Auto-power-off ………………………………………………15
7.Functionskeys ……………………………………………………16
7−1 Comparatorfunction ………………………………………16
7−2 Memory(save)function ……………………………………17
8．Fuse&Batteryreplacement ……………………………………18
8−1 Batteryreplacement ………………………………………18
8−2 Fusereplacement …………………………………………18
9．NotesonHousingcaseandaccessories ………………………19
9−1 Caselid ………………………………………………………19
9−2 NeckstrapandCordcase ………………………………19
9−3 Testprodsandreplacement ……………………………20
9−4 AdaptorsfortheEarthcordandreplacement……………20
10．Cleaningoftheinstrument ……………………………………21
11．Servicing …………………………………………………………21

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.
AUTION：isreservedforconditionsandactionsthatcan
causeinjuryorinstrumentdamage.
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.
―1―

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whenconnectingthetestleadstothe
instrument.
¡
NeverrotatetheRangeselector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selector switchto OFFposition when opening the
Batterycoverforbatteryreplacement.
CAUTION
¡
Alwaysset the Range selector switchto the appropriate position
beforemakingmeasurement.
¡
SettheRangeselector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tempera-
tures,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.
Symbols
―2―
F
〜
Dangerofpossibleelectricshock
Instrumentwithdoubleorreinforcedinsulation
AC
Earthterminal

―3―
２．Features
KEW3021/3022/3023arefour-rangedigitalinsulationresistance
testersfortestinglow-voltageinstallationbelow600V.Resistance
measurementwithaudibleContinuitycheckfunctionisalsoavailable.
¡Designedtofollowingsafetystandards:
IEC61010-1(CAT.III600VPollutiondegree2)
IEC61010-031(Requirementsforhand-heldprobes)
¡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LED&
markonLCD.
¡Tworesistance ranges:40Ω and 400Ω (2-range auto)are also
available.Buzzersoundswhenameasuredcurrentexceeds
200mA.
¡Thisinstrumenthas0Ω ADJ.functiontonulltheresistanceoftest
leadorfuseatresistancemeasurement.
¡Measuredvalueisheldforabout5sec.afterinsulation/resistance
measurementoftheTestbuttonisreleased.
¡Backlightfunctiontofacilitateworkatnightordimlylitlocations.
¡Bar-graphtoindicatemeasuredresults
¡Max.99datacanbesavedtotheinternalmemoryattheinsulation
resistancerange.
¡Visible and audible warning ( or is indicated and buzzer
sounds)whenthemeasuredinsulationresistanceexceedsthepre-
setvalue.
¡Livecircuitwarningindication,LEDandbuzzer.
¡TheSafetykeymustbekeptpresseddowntoselect500Vor1000V
range. Otherwise,neither500Vor1000Vrangecanbeselected.
¡Auto-powerofffunction
Topreventtheinstrument being leftpoweredonandconserve
batterypower, the instrumentautomatically turnsoffapprox. 15
min.afterthelastswitchoperation.
¡The markflickerswhenthebatteryvoltagedropstothelower
limit.
¡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

―4―
¡Applicablestandards
IEC61557
IEC61010-1MeasurementCAT.III600VPollutiondegree2
(Locationforuse:altitude2000morless)
IEC61010-031
IEC60529 IP40
¡Measuringrangeandaccuracy
<Insulationresistancerange>
３．Specification
Nominalvoltage
AutoRange
Opencircuit
voltage
Shortcircuit
current
Nominaltest
current
1st effective
measurement
range
Centerscale
range
Accuracy
2nd effective
measurement
range
Accuracy
Accuracyat0
KEW3021
1000V
0〜4/40/400/2000MΩ
Nominaltestvoltage0%〜＋20%
Within1.5mA
1MΩ
1mA0%〜＋20%
0.100〜
1000MΩ
50MΩ
0〜
0.099MΩ
1001〜
2000MΩ 200.1〜 2000MΩ 40.0〜 2000MΩ 20.01〜 200.0MΩ
0〜
0.099MΩ 0〜 0.099MΩ 0〜 0.099MΩ
±(2%rdg＋6dgt)
±(5%rdg＋6dgt)
Within6dgt
50MΩ 5MΩ 5MΩ
0.100〜
200.0MΩ
0.100〜
40.0MΩ
0.100〜
20.0MΩ
0.5MΩ 0.25MΩ 0.125MΩ
500V 250V 125V
0〜4/40/200MΩ
Nominalvoltage
AutoRange
Opencircuit
voltage
Shortcircuit
current
Nominaltest
current
1st effective
measurement
range
Centerscale
range
Accuracy
2nd effective
measurement
range
Accuracy
Accuracyat0
KEW3022
500V
Nominaltestvoltage0%〜＋20%
Within1.5mA
0.5MΩ
1mA0%〜＋20%
0.100〜
200.0MΩ
50MΩ
0〜
0.099MΩ
1001〜
2000MΩ 200.1〜 2000MΩ 40.0〜 2000MΩ 20.01〜 200.0MΩ
0〜
0.099MΩ 0〜 0.099MΩ 0〜 0.099MΩ
±(2%rdg＋6dgt)
±(5%rdg＋6dgt)
Within6dgt
50MΩ 5MΩ 5MΩ
0.100〜
200.0MΩ
0.100〜
40.0MΩ
0.100〜
20.0MΩ
0.25MΩ 0.1MΩ 0.05MΩ
50V
0〜4/40/400/2000MΩ
250V 100V
0〜4/40/200MΩ

―5―
Nominalvoltage
AutoRange
Opencircuit
voltage
Shortcircuit
current
Nominaltest
current
1st effective
measurement
range
Centerscale
range
Accuracy
2nd effective
measurement
range
Accuracy
Accuracyat0
KEW3023
1000V
0〜4/40/400/2000MΩ
Nominaltestvoltage0%〜＋20%
Within1.5mA
1MΩ
1mA0%〜＋20%
0.100〜
1000MΩ
50MΩ
0〜
0.099MΩ
1001〜
2000MΩ 200.1〜 2000MΩ 40.0〜 2000MΩ 20.01〜 200.0MΩ
0〜
0.099MΩ 0〜 0.099MΩ 0〜 0.099MΩ
±(2%rdg＋6dgt)
±(5%rdg＋6dgt)
Within6dgt
50MΩ 5MΩ 5MΩ
0.100〜
200.0MΩ
0.100〜
40.0MΩ
0.100〜
20.0MΩ
0.5MΩ 0.25MΩ 0.1MΩ
500V 250V 100V
0〜4/40/200MΩ
<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＋Ｅ22＋Ｅ32）
Ａ：Intrinsicerror（％）
Ｂ：Operatingerror（％）
Ｅ1：Variationduetochangingtheposition（％）
Ｅ2：VariationduetochangingtheSupplyvoltage（％）
Ｅ3：Variationduetochangingthetemperature（％）
Nominaloperatingconditions
Ambienttemperature :0〜40℃
Relativehumidity :90%orless
Position :Horizontal〜±90゜
Batteryvoltage :withinthebatteryeffectiverange

<Numberofmeasurement>
Possiblenumberofmeasurementwithinthe"BATTERY.GOOD"
range.
(Measure5sec.,andtakepausefor25sec.)
Temperature :0℃〜40℃ (RH:90%orless)
&
humidityrange :(nocondensation)
Storagetemperature :-20℃〜60℃ (RH:75%orless)
&
humidityrange :(nocondensation)
Responsetime :Indicatedvalueateach insulation resistance
rangecomeswithinaccuracywithin5sec.after
aresistancecorresponding tothemid-value
and0
Ω issuddenly applied acrossthe
measuringterminals.(Itmaytake timewhen
measuringacapacitiveload.)
Withstandvoltage :AC5,320V(50/60Hz)for5s.betweenthe
electricalcircuitandtheenclosure．
Overloadprotection :Theinstrumentoperatesproperlyaftereachof
thevoltageshowninthetablebelowis applied
for10sec.
20〜600V
±(3%rdg+6dgt)
Within6dgt
Measuredvoltage
Accuracy
Accuracyat0
Auto-range
Open-circuitvoltage(DC)
Short-circuitcurrent
Measuringrangetokeep
operatingerror/tolerance
Outsideofthemeasuringrange
tokeepoperatingerror/tolerance
0〜40.00/400.0Ω
5V±20%
DC200mAormore
0.2〜400Ω/±(2%rdg+8dgt)
0〜0.19/Ω0.1Ω
―6―
<Resistancerange>
<Voltagerange>
Range
50V
100V
125V
250V
500V
1000V
Continuity
Resistorfortest
0.05MΩ
0.
1 MΩ
0.
125 MΩ
0.
25 MΩ
0.
5 MΩ
1 MΩ
1 Ω
Possiblenumberof
measurement
atleast1300times
atleast1300times
atleast1200times
atleast1000times
atleast1000times
atleast400times
atleast1300times

―7―
Pickletypeprod
MODEL
Continuityrange
Insulation
resistance
ACvoltage
3021/3023
AC600V
Allranges:AC1200V
AC720V
3022
AC600V
Allranges:
AC600V
AC720V
Auto-ranging:
Rangeshiftstoupperrange :whenareadinggoover4200
Rangeshiftstolowerrange :whenareadinggotolessthan320
Dimension :approx.105(L)×158(W)×70(D)mm
Weight :approx.600g(includingbatteries)
Powersource :R6PorLR6sizeAAx6pcs
Nominalpower :2.7VA
Accessories
MODEL7103Testleadwithremotecontrolswitch 1set
MODEL7161testbar 1pce
MODEL7131Safetyalligatorclip 1pce
MODEL8017Extensionprod 1pce
Neckstrap 1pce
Cordcas 1pce
R6P(SUM-3),sizeAA 6pcs
Instructionmanual 1pce
Optional
MODEL7115Extensionprobe
MODEL8016Pickletypeprod
Extensionprobe Fig.1

―8―
４．Instrumentlayout
①
③
⑤
⑦
⑨
⑪
⑬
⑮
⑰
⑲
21
○
Testbutton
ENTERkey
DOWNkey
Compkey
Safetykey
LIVELED
Probesocket
Lineprobe
Standardprod(MODEL8072)
Probeconnector
Safetyalligatorclip
(MODEL7131)
Rangeselectorswitch
MEMkey
UPkey
0ΩADJ.key
Backlightkey
Display
Testleadwithremotecontrol
switchMODEL7103
Remotecontrolswitch
Earthcode
Testbar(MODEL7161)
Extensionprod
(MODEL8017)
②
④
⑥
⑧
⑩
⑫
⑭
⑯
⑱
⑳
22
○
Fig.2 Instrumentlayout(KEW3022)

5-1Testleadconnection
Insert the Probe connector into the Probe socket on the instrument
correctlyasshownbelow.
5-2 ChecksonTestleadandFuse
(1)SettheRangeselectorswitchontheinstrumenttotheΩ
(CONTINUITY)position.
(2)Breakintestleadorfuseissuspectedif"OL"isdisplayedonthe
LCDwhenshortingtheLINE(red)andEARTH(black).
(3)Testleadorinstrumentitselfmay have troubleswhen"OL"is
displayedontheLCDafterreplacingthefuse.Inthiscase,send
theinstrumenttoyourlocalKYORITSUdistributorforrepair.
DANGER
¡WhentheTestbuttonorthe Remote controlswitchispressed
whiletheRangeselector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.
¡Testleadandfusemustbeinspectedpriortomeasurement
accordingtoClause5-2indicatedinthismanualinordertoavoid
possibleelectricalshockhazard.Voltagecannotbemeasuredifa
breakispresentonthefuse.
―9―
Probesocket
Probeconnector
５．Preparationformeasurement
Fig.3

6-1Voltagemeasurement(Mainsdisconnectioncheck)
(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)TakethereadingontheLCDwithoutpressingtheTestbuttonor
Remotecontrolswitch.Themark"〜" isdisplayedwhen
measuringACvoltage. Themark"− (minus)" isdisplayedwhen
theLINEprobeisconnectedtothenegativesideoftheconductor
undertestto measureDCvoltage. "Lo"is displayedontheLCD
whenthemeasuredvoltageisunder20V.
DANGER
¡Testleadandfusemustbeinspectedpriortomeasurement
accordingtoClause5-2indicatedinthismanualinordertoavoid
possibleelectricalshockhazard.Voltagecannotbemeasuredifa
breakispresentonthefuse.
¡Never makemeasurementonacircuitinwhichtheelectrical
potentialexceedsAC/DC600Vinordertoavoidpossibleshock
hazard.(Referto"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.
6-2Insulationresistancemeasurement
Beforeperformingany insulation test, check the maximumvoltage
thatmaybeappliedtothecircuitundertest.
―10―
６．Measurement
CAUTION
Neverpress
testbutton
CAUTION
Neverpress
remoteswitcth
Fig.4

―11―
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selector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 selectorswitchtoadesiredinsulation
resistancerange.KeeptheSafetykeypresseddownwhenturning
theRangeselectorswitchto500Vand1000Vposition.(Onlythe
500VrangeisavailableonKEW3022.)Themessage"no"is
displayedontheLCDwhenturningthe Range selector switch
withoutpressingtheSafetykey.
¡BuzzersoundswhentheSafetykeyispresseddown.
KeeptheSafetykeypresseddownwhenswitching500Vand1000V.
Fig.5

―12―
(5)SettheRangeselectorswitchtotheOFFpositionand disconnect
thetestleadsfromtheinstrumentaftermeasurement.
<Autodischargefunction>
Thisfunctionallowselectricchargesstoredinthecapacitanceofthe
circuitundertesttobeautomaticallydischargedaftertesting.
SettheRangeselectorswitchtotheOFFpositionorturntheRemote
controlswitchoffwiththetestleadconnected.
DischargecanbemonitoredbytheLIVELED and mark.
(2)ConnecttheEarthprobetotheearthterminalofthecircuitunder
test.If thecircuit isnot earthed,connect theEarth probetoany
appropriateconductor.
(3)ConnecttheLineprobetothecircuitundertestandpresstheTest
buttonorRemotecontrolswitch.
(4)TakethereadingontheLCD.
Principleofoperation:
Resistance=Voltage/Current
RX=V/I
Fig.6
Fig.7
Fig.8

(6)SettheRangeselectorswitchtotheOFFposition,anddisconnect
theprobesfromtheinstrument.
DANGER
¡Nevertouchthecircuitundertestimmediatelyaftertesting.
Capacitancestoredinthecircuitmaycauseelectricshock.
Leavethe test leads connectedtothe circuit until the LIVELED
andLIVEcircuitwarningstopflickering.
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.
―13―
Nominalvoltage
1MΩ
1000V
0.5MΩ
500V
0.25MΩ
250V
0.125MΩ
125V
0.100MΩ
100V
50kΩ
50V
Lowerlimitofins-
ulationresistance
tosupplynominal
current1mA

―14―
6-5Measurementofresistance(Continuitycheck)
DANGER
¡Donotapplyvoltagetotheresistancerange.Alwaystestthecircuit
orequipment toensure itis surely de-energizedbefore
measurement.
ZeroΩ ADJ.function
Thisisafunctiontonulltheresistanceofthetestleadorfuseinorder
todisplaytheresistanceoftheequipmentundertestonly.
Setting:
(1)SettheRangeselectorswitchtotheΩ(Continuity)position.
(2)Shortthetestleads:LINE(red)andEARTH(black).
(3)PresstheZeroΩ ADJ.keywiththeTestbuttonlockedorwiththe
Remotecontrolswitchpressed. Then mark islitupand a
valueof0.00Ω isdisplayedontheLCD.Thisvalueissavedin
thememory ofthe instrumentand won'tbe cleared after turning
offtheinstrument.
Fig.9

Releasing:
(1)SettheRangeselectorswitchtotheΩ(Continuity)position.
(2)Openthetestleads:LINE(red)andEARTH(black).
(3)PresstheZeroΩ ADJ.
key
toreleasethisfunctionwhen"OL"is
displayedontheLCDwhiletheTestbuttonislockedorthe
Remotecontrolswitchispresseddown.
Measurement:
(1)SettheRangeselectorswitchtotheΩ (Continuity)position.
(2)Connectthetestleadstotheequipmentundertest,andpressthe
TestbuttonorRemotecontrolswitch.
Principleofoperation:
Resistance=Voltage/Current
RX=V／ I
Note:
¡ThezeroΩ ADJ.functionisavailablewhentheindicatedvalueis
under9Ω.
¡AbeakinTestleadorfuseissuspectedwhen"OL"isdisplayedon
theLEDevenifLINE(red)andEARTH(black)areshorted.
¡ChangetheconnectionofLINE(red)andEARTH(black)when
measuringthevoltagewiththeswitchedpolarities.
¡Themeasurementresultattheresistancefunctionmaybeeffected
by theimpedanceortransientcurrentintheoperatingcircuit,which
isconnectedinparalleltotheinstrument.
6-6Backlightfunction
Tofacilitateworkingindimlylitsituations,a
backlight function is provided which
illuminatesthe display. Press thebacklight
key
tooperatethis function. The backlight
willlightupforabout60sec.,andthenturns
offautomatically.
6-7Auto-power-off
Topreventtheinstrumentbeingleftpoweredonandconservebattery
power,theinstrumentautomaticallyturnsoffapprox.15min.afterthe
lastswitchoperation.
Toturn onthe instrumentagain, turn the Range selector switchto
OFFpositiononce.
Thensetittothedesiredrange.
―15―
Fig.10
Fig.11

7-1Comparatorfunction
Set a reference resistance value at the insulation resistance range.
Themeasuredvalueiscomparedtothepre-setreferencevalue,and
themarkof or isdisplayedontheLCDandbuzzer
Settablereferencevalue:
0.1/0.2/0.25/0.4/0.5/1/2/3/5/10/20/30/50/100/Any:Unit[MΩ]
Theupperlimitof
" Any " variesdependingonoutputvoltage.
50/100/125Ｖ:0.000to199.9:Unit[MΩ]
250/500/1000Ｖ:0.000to999.9:Unit[MΩ]
Thisfunctioncanbesetateachrange.
Settingprocedure
(1)SettheRangeselectorswitchtoanydesiredinsulationresistance
rangewiththe
key presseddown.
Inthiscase,thereisnoneedtopresstheSafety
key tosetthe
rangeselectorswitchto500Vor1000Vrange.
(2)PresstheUPorDOWN
key
toselect or andthenpress
the
key .
Select tosound the when the measured value exceeds the
pre-setvalue.
Select tosound the when the measured value is under the
pre-setvalue.
(3)ThenumberdisplayedatthelowerleftontheLCDstarts
flickering.Pressthe UPorDOWN
key toselectthe reference
value,andpressthe
key .
(4)Themessage and the set value are displayed on the LCD
oncethesettingcompletes.
(5)Pressthe keytoreleasethisfunction.
SettingforAny
(1)ThedecimalpointdisplayedatthelowerleftontheLCDstarts
flickeringwhen"Any"isselected.PresstheUPorDOWN
key to
selectthedesireddecimalposition,andthenpressthe
key .
(2)Thefour-digitstartflickeringfromtheleft.PresstheUPorDOWN
key andsetittothedesiredvalue,andpressthe key .
e.g.:incase0.5M
Ω isset.
―16―
7．Functionskeys
Fig.12.Changeofsub-indication

―17―
7-2Memory(save)function
Measuredinsulationresistancecanbesavedtotheinternalmemory
upto99data.
Savingmethod:
(1)Measuretheinsulationresistance,andpresstheMEMkeywhile
themessage isdisplayedontheLCD.Thenamemory
numberdisplayedatthelower left flickers.Selectanymemory
numberwiththeUPorDOWNkey,andpressthe key.
(2)Then,themeasurementresultdisplayedatthemiddleontheLCD
flickers.Press the key to save theresult.It willbe saved to
theinternalmemory,andthememorynumberisincreasedby1.
Pressthe keytodeletetheresult.
Recallingthememorydata
(1)SettheRangeselectorswitchtoanydesiredInsulationresistance
range,andpressthe key.
(2)PresstheUP or DOWN key toswitch thememory number.The
measuredvoltageandvaluearedisplayedontheLCD.
Deletingallmemorydata
(1)Todeleteallmemory,rotatetheRangeselectorswitchfromOFF
toΩ(CONTINUITY)positionwiththe keypresseddown.Then
releasethe key.
(2)Themessage"clr"isdisplayedontheLCD.Itflickersandbuzzer
soundswhenthe keyisbeingpresseddownagain.The
deletioniscompletedonce"Ω"isdisplayedontheLCD.
Note:
¡Themark"---"isdisplayedontheLCDwhennodataissavedwith
theselectedmemoryNo.
¡ResistancevalueisdisplayedontheLCDwhendataissavedwith
theselectedmemoryNo.
¡Olddataisoverwrittenwithnewwhenanewdataissavedwiththe
samememoryNo.

DANGER
¡Neveropen the Batterycover during ameasurement.Dispose
theused batteries accordingto therules,which isdefined by
eachcommunity.
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.
8-1BatteryReplacement
(1)Disconnectthetestprobefromtheinstrument.
(2)Openthebatterycompartmentcoverby unscrewingthemetal
captivescrewtorevealbatterycompartment.
(3)Alwaysreplaceallsixbatterieswithnewonesatthesametime.
(4)Screwthebatterycompartmentlidbackonbeforeusingthe
instrument.
8-2FuseReplacement
(1)Disconnectthetestprobe
fromtheinstrument.
(2) Openthe batterycompartment
coverby unscrewing the metal
captive.Screwto reveal battery
compartmentandreplacethe
fuse.
Fusetype:500mA/600V(F)
quickactingceramicfuse
6.35x32mm.
(3)Screwthebatterycompartment
lidbackonbeforeusingthe
instrument.
―18―
Fig.13
8．Fuse&Batteryreplacement
BATTERY
SCREW
FUSE
SPARE
FUSE