KYORITSU KEW3431 User manual

Instruction Manual
Compact Insulation resistance tester
KEW3431
www.GlobalTestSupply.com
Find Quality Products Online at: [e-mail]

Contents
1. Safetywarnings･･･････････････････････････････････････ 1
2. Features･･････････････････････････････････････････････ 5
3. Specifications･････････････････････････････････････････ 6
4. Instrumentlayout･･････････････････････････････････････ 9
5. Accessories･･････････････････････････････････････････ 11
6. Gettingstarted･･･････････････････････････････････････ 12
6-1 Mechanicalzeroadjustment････････････････････ 12
6-2 Attachingmetaltip/adaptertotestleads････････ 12
6-3 Batteryvoltagecheck･･････････････････････････ 13
7．Voltagemeasurement･････････････････････････････････ 14
7-1 Measurementmethod･･････････････････････････ 14
8. Insulationresistancemeasurement･････････････････････ 15
8-1 Measurementmethod･･････････････････････････ 18
8-2 Continuousmeasurement･･････････････････････ 19
8-3 Outputvoltagecharacteristics･･････････････････ 20
8-4 LEDinsulationstatusindicator･････････････････ 21
9. ScalelightandLEDlight･･････････････････････････････ 22
10.
HowtodisableLEDinsulationstatusindicator&auto-lighting ･･ 23
11.Batteryreplacement ･･････････････････････････････････ 25
12.Shoulderstrapbeltattachment･････････････････････････ 26
13.StoringinCarryingcase･･･････････････････････････････ 27
14.Cleaningmetercover･････････････････････････････････ 28
www.GlobalTestSupply.com
Find Quality Products Online at: [e-mail]


1

1. Safety warnings
This instrument has been designed, manufactured and tested
according to IEC 61010: Safety requirements for Electronic
measuring apparatus, and delivered in the best condition after
passingqualitycontroltests.
This instruction manual contains warnings and safety rules which
have to be observed by the user to ensure safe operation of the
instrument and to maintain it in safe condition. Therefore, read
through these operating instructions before starting to use the
instrument.
#  DANGER
●Read through and understand the instructions contained in this
manualbeforestartingtouse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. Kyoritsu is by no means
liableforanydamageresultingfromtheinstrumentincontradiction
tothesecautionarynotes.
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.
www.GlobalTestSupply.com
Find Quality Products Online at: [e-mail]


2

#  DANGER
●Never makemeasurementsoncircuitsin which earthpotentials
higherthan600Vexist.
●
KEW3441isaCATIII-ratedinstrument.Donotmakemeasurements
under the circumstances exceeding the designed measurement
category.
●Do not attempt to make measurements 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itssurfaceoryourhandiswet.
● Becarefulnottoshort-circuitthepowerlinewiththemetalpartof
thetestleadduringameasurement.Itmaycausepersonalinjury.
● Donotexceedthemaximumallowableinputofanymeasuringrange.
● Neveropenthebatterycompartmentcoverduringameasurement.
●Theinstrumentshouldbe usedonlyin itsintendedapplications
or conditions. Otherwise, safety functions equipped with the
instrument do not work, and instrument damage or serious
personalinjurymaybecaused.
●Verify proper operation on a known source before use or take
actionasaresultoftheindicationoftheinstrument.
#  WARNING
●Never attempt to make any measurements if any abnormal
conditions, such as a broken cover or exposed metal parts are
presentontheinstrumentandtestleads.
●Ensurethatthetestleadsarefirmlyconnectedtotheinstrument,
andthenpressthetestbutton.
●Do not install substitute parts or make any modifications to
the instrument. Return the instrument to your local KYORITSU
distributorfor repair or re-calibration incase of suspected faulty
operation.
●
Donottrytoreplacebatteriesifthesurfaceoftheinstrumentiswet.
●Connectthetestleadsfirmlyintoeachterminal.
●SetthefunctionswitchtoOFFpositionwhenopeningthebattery
compartmentcoverforbatteryreplacement.
●Neverrotatethefunctionswitchwiththetestleadsconnectedto
theequipmentundertest.
www.GlobalTestSupply.com
Find Quality Products Online at: [e-mail]


3

#  CAUTION
●Always make sure to set the function switch to the appropriate
positionbeforemakingameasurement.
●Power off the instrument after use. Remove 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temperature,
humidityordew.
●Useadampclothwithneutraldetergentorwaterforcleaningthe
instrument.Donotuseabrasivesorsolvents.
●Thisinstrument isnotwater-proof. Donot letthe instrumentget
wetwithwater;otherwiseitmaycausemalfunction.
●Ifthe instrument is wet,make sure to letitdry before puttingit
intostorage.
●
Keepyourhandandfingersbehindthebarrierduringameasurement.
Symbols
Thefollowingsymbolsareusedandmarkedontheinstrumentandin
theinstructionmanual.Pleasecarefullycheckbeforestartingtouse
theinstrument.
CATⅢ
Primary electrical circuits of the equipment connected
directly to the distribution panel, and feeders from the
distributionpaneltooutlets.

Doubleorreinforcedinsulation
#
User must refer to the explanations in the instruction
manual.

Earth
Dangerofpossibleelectricshock
www.GlobalTestSupply.com
Find Quality Products Online at: [e-mail]


4

MeasurementCategory
To ensure safe operation of measuring instruments, IEC 61010
establishes safety standards for various electrical environments,
categorizedas O to CAT IV, and called measurement categories.
Higher-numberedcategories correspondto electrical environments
with greater momentary energy, so a measuring instrument
designed for CAT III environments can endure greater momentary
energythanonedesignedforCATII.
O :Circuits which are not directly connected to the mains
powersupply.
CATII :Electrical circuits of equipment connected to an AC
electricaloutletbyapowercord.
CATIII:Primary electrical circuits of the equipment connected
directly to the distribution panel, and feeders from the
distributionpaneltooutlets.
CATIV:Thecircuitfromtheservicedroptotheserviceentrance,
and to the power meter and primary over-current
protectiondevice(distributionpanel).
O: Device which is
not directly
connected to the
mains power supply
www.GlobalTestSupply.com
Find Quality Products Online at: [e-mail]


5

2. Features
KEW3431 can measure insulation resistance and also AC/DC
voltageonlow-voltageinstallationsof600Vorless.
●Designedtomeetthefollowingsafetystandards
IEC61010-1,IEC61010-2-030CATIII600VPollutiondegree2
IEC61010-031
●Compactandlightweightdesign
●Scale light and LED spot light to facilitate working at dimly
illuminated location or at nighttime work. Built-in illuminance
sensorautomatically turns onoff thelights.Auto-light-off function
isalsoavailabletoturnofftheselightsautomaticallyifthefunction
switch is not moved or the test button is not pressed for two
minutes.Theauto-lightingfunctioncanbeturnedoff.
●Test probe with remote control switch is supplied as standard
accessory
●Shoulderstrapforboth-handsoperation
●User-changeabletestprods
●LivecircuitwarningwithblinkingLEDandbuzzer
●Voltagemeasurement
・AC/DCautodetection
・Livecircuitwarningforavoltageinputof30Vorhigher
●Insulationresistancemeasurement
・Withauto-dischargefunction
When an insulation resistance like a capacitive load is
measured, electric charges stored in capacitive circuits are
automatically discharged after measurement. Discharge can be
checkedwiththewarningLEDandbuzzer.
・Withalarmfunction
The LED indicates whether a measured value is less than or
higherthanthereferencevalue.Forfurtherdetail,see8-4.LED
insulation status indicator in this manual. This function can be
turnedoff.
・Safetyrangebetween500Vand1000Vranges
・Discontinuouswarning buzzer soundswhen thefunction switch
issetto1000Vrange.
www.GlobalTestSupply.com
Find Quality Products Online at: [e-mail]


6

3. Specifications
●Measuringrangeandaccuracy（23ºC±5ºC,RH85%orless）
[Voltagemeasurement]
Measurement
voltage 0〜600V
Accuracy within±5%ofthemaximumscalevalue
※
 Foraninputvoltageof30Vormore,theinstrumentautomatically
judgesACorDCandindicatestheresultwiththeLED.
ForACvoltage:RedLEDlightsup.
ForDCvoltage:OrangeLEDlightsup.
（TheLEDdoesntlightupifinputvoltageislessthan30V.）
[Insulationresistancemeasurement]
Ratedmeasurement
voltage 250V 500V 1000V
Max.effectivescale
value 200MΩ 200MΩ 2000MΩ
Accuracyinfirst
effectivemeasuring
ranges
0.1to100MΩ 1to1000MΩ
within±5%ofindicatedvalue
Accuracyinsecond
effectivemeasuring
ranges
within±10%ofindicatedvalue
※measuring ranges other than above, 0 and
∞ticks
Accuracyat0&∞ within±0.7%ofscalelength
Open-circuitvoltage
100%to120%ofratedmeasurementvoltage
Ratedmeasurement
current 1mA,0%to+20%
Short-circuitcurrent within1.5mA
www.GlobalTestSupply.com
Find Quality Products Online at: [e-mail]


7

●Applicable
standards
●IEC61010-1,2-030CATIII600V
Pollutiondegree2
●IEC61557-1,-2
●IEC60529IP40
●IEC61326-1,2-2
●IEC61010-031
MODEL7260…CATIII600V(w/cap)
 CATII1000V(w/ocap)
 CATII1000V(w/8017A)
(Attachthesuppliedprotectivecaptousethis
testleadsinCATIIIorhigherenvironments.)
MODEL7261…CATIII600V(w/alligatorclip)
 CATII600V(w/flattestbar)
(Attachthealligatorcliptousethistestleads
inCATIIIorhigherenvironments.)
※Whentest probes,sometimeswithmetaltips,
are connected and used with the instrument,
the measurement category and voltage rating
ofthelowestrateditemisapplied.
●Locationforuse Altitude2000morless,in-dooruse
●Operatingtemp.
&humidityrange 0ºCto40ºC,80%orless(nocondensation)
●Storagetemp.
&humidityrange -10ºCto50ºC,75%orless(nocondensation)
●Withstand
voltage
5160VAC(50/60Hz)/5sec
Betweenelectricalcircuitandenclosure
●Insulation
resistance
50MΩormore/1000VDC
Betweenelectricalcircuitandenclosure
●Auto-power-off Turns off the instrument automatically, after a
beepsound,ifthereisnofunctionchange,range
changeorbuttonpressforabout10min.
(※notworkduringameasurement)
●Scalelight/
LEDlight
Automaticallyturns offif there isno activity for
about2min.(※disabledduringameasurement)
●Dimensions 97(L)×156(W)×46(H)mm
●Weight Approx.430g(includingbatteries)
●Powersource FoursizeAAbatteries
※Useofalkalinebatteryisrecommended.
www.GlobalTestSupply.com
Find Quality Products Online at: [e-mail]


8

●Operatinguncertainty(IEC61557-2)
Operating uncertainty (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IEC61557-2,themaximumoperatingerror
should be within ± 30%. Intrinsic error (A) is uncertainty of the
performancecharacteristicsofinsulationresistancetestersin the
referencecondition.
※Formula:B=±(｜A｜+1.15x√E1
2+E2 2+E3 2)
A Intrinsicerror
E1Influenceofposition(referenceposition±30°)
E2
Influenceofsupplyvoltage
(untilredLEDbatterystatusindicatorlightsup)
E3Influenceoftemperature(0ºC〜40ºC)
Thespecsofthisinstrumentareasfollows.
Intrinsicerror(A)…………………within±5%ofindicatedvalue
(coveragefactor:k=2)
Influenceofposition(E1)…………within±15%ofindicatedvalue
Influenceofsupplyvoltage(E2)…within±5%ofindicatedvalue
Influenceoftemperature(E3)……within±5%ofindicatedvalue
Max.operatinguncertainty(B)…24%
※The measuring range to keep the max. operating uncertainty is
thesameasthe1steffectivemeasuringrange.
●Possiblenumber ofmeasurements wherebattery voltageis within
theeffectiverange(measurementof5sec.,pauseof25sec.)
Function Testresistor Possiblenumberof
measurements
250V 0.25MΩ Approx.2000times
500V 0.5MΩ
1000V 1MΩ Approx.1000times
※incaseofusingalkalinebatteries
www.GlobalTestSupply.com
Find Quality Products Online at: [e-mail]