KYORITSU KEW3431 Manuale utente

Instruction Manual

Compact Insulation resistance tester

KEW3431

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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

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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.

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

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.

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

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

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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

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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.

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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

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●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.

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

●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°)

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

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