Extech Instruments MA440 Manuel utilisateur

USERMANUAL

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ModelMA440400AACClampMeterDMM

ModelMA443TrueRMS400ACClampMeterDMM

ModelMA445TrueRMS400AAC/DCClampMeterDMM

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MA44x‐en‐GB_V1.08/16

Introduction

ThankyouforselectingtheExtechEX44xSeries400AClampMeter.

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TheMA440isa400AACClampmeterwithatotalof9functions.

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TheMA443isa400ATrueRMSACClampmeterthatoffers10functionsincludingTRMSAC

measurementsandTypeKThermocouple

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TheMA445isa400AAC/DCTrueRMSClampmeterwith11functionsincludingDCCurrent,TRMS

ACmeasurements,andTypeKThermocouple.

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TheMA44xseriesarehand‐held,4000countclampmeters.ThismeterseriesmeasuresAC/DC

voltage,ACcurrent,DCcurrent(MA445),resistance,diode,continuity,capacitance,temperature

(MA443andMA445),frequency,anddutycycle.Inaddition,thesemetersofferDisplayhold,MIN‐

MAX(MA443andMA445),Relativemode,NCV(non‐contactvoltagedetection),andautomatic

powerOFF.

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Inadditiontothemeter,thepackagingincludesInstructionaldocumentation(QuickStart),Test

Leads,K‐typetemperatureprobe(MA443andMA445),batteries,andapouch.

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Thisdeviceisshippedfullytestedandcalibratedand,withproperuse,willprovideyearsofreliable

service.Pleasevisitourwebsite(www.extech.com)tocheckforthelatestversionofthisUser

Guide,ProductUpdates,ProductRegistration,andCustomerSupport.

Safety

Toensurethesafeoperationandserviceofthemeter,followtheseinstructionsclosely.Failuretoobserve

warningscanresultinseverepersonalinjuryordeath.

TheseinstrumentsaredesignedandproducedinstrictaccordancewithIEC/EN61010‐1,IEC/EN61010‐2‐032,

andIEC/EN61010‐2‐033,safetystandards,andcomplywiththesafetystandardfordoubleinsulation,

overvoltageCATIII600Vandpollutionlevel2.Pleaseobservealloperationalandsafetyinstructions

otherwisetheprotectionprovidedbyinstrumentmaybecompromised.

TheseinstrumentsconformtoULstandard61010‐1,61010‐2‐032,61010‐2‐033;theseinstrumentsare

certifiedtoCSAstandardC22.2no.61010‐1,IECstandard61010‐2‐032,andIECstandard61010‐2‐033.

CATIII:Applicabletotestandmeasuringcircuitsconnectedtothedistributionsectionofabuilding’slow

voltagemainsinstallation;beforeuseoftheseinstrumentspleaseobserveandobeyallsafetyinstructions.

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MA44x‐en‐GB_V1.08/16

WARNINGS

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WARNINGSidentifyhazardousconditionsandactionsthatcouldcauseBODILYHARMorDEATH.

1. Beforeuse,checktheclampmeterandprobefordamageorabnormaloperation.Donotusethemeter

ifprobeinsulationdamage,meterdisplayproblems,abnormalmeterfunctioning,etc.isobserved.

2. Neverusethemeterwiththebatterycompartmentopenorwiththemeterhousingdisassembledinany

way;otherwiseariskofshockwillexist.

3. Whentakingmeasurements,ensurethatyourhandandfingersareinthesafeareabehindthefinger

guard.Donottouchbarewireorconnectors,unusedinputterminals,orthecircuitundertesttoprevent

electricalshock.

4. Beforetakingmeasurements,thefunctionswitchmustbesettothecorrectposition.Toprevent

damagetothemeter,thefunctionswitchmustnotbeturnedwhilemeasurementsaretakingplace.

5. Donotapplyvoltage600VACorDCorgreaterbetweentheclampmeterterminalsandground.Failure

tofollowtheseinstructionscancauseelectricshockanddamagetothemeter.

6. Whenmeasuringsignals>42VDCor>30VACrmspleaseusecautionastheselevelscancauseelectrical

shock.

7. Donotmeasurevoltageorcurrenthigherthantheallowableinput;thefunctionswitchmustbesetto

themaximumrangepositionfirstwhentherangeofthemeasuredsignalisunknown.Beforemeasuring

resistance,diode,andcontinuitypleaseremovepowertothecircuitundertestanddischargeall

capacitors.

8. Whenthelowbatterysymbolisdisplayed,replacedthebatteriespromptlytoensuremeasurement

precision.Removebatteriesfromthemeterifthemeteristobestoredlongerthan60days.

9. Donotserviceormodifytheinternalcircuitsofthemeter.Qualifiedpersonnelmustservicethemeter

only.

10. Donotusethemeterinflammableorexplosiveenvironments(gasorvapors).Donotusethemeterin

environmentsthatexceedtheoperationaltemperatureandhumidityspecifications.Donotusethe

meterinareaswhereastrongelectromagneticfieldispresent.

11. Tocleanthemeter,useonlyasoftdampcloth(neutraldetergentsonly)towipethemeterhousing.Do

notuseabrasivesorsolvents.Donotcleanthemeterifitispoweredonorconnectedtoacircuitunder

test;alwayspowerthemeterOFFanddisconnectthetestleadsbeforecleaning.

12. Useonlythetestprobesprovided.Replacetestprobeswithonesofthesameratingorbetter.Thetest

probesaretobeusedformainsmeasurementsCATIIIorCATIVinaccordancewithIEC61010‐031and

shallhaveavoltageratingofatleastthevoltageofthecircuittobemeasured.

13. IndividualprotectiveequipmentshouldbeusedifHAZARDOUSLIVEpartsintheinstallationwhere

measurementsaretobecarriedoutcouldbeaccessible.

14. Iftheequipmentisusedinamannernotspecifiedbythemanufacturer,theprotectionprovidedbythe

equipmentmaybeimpaired.

15. Toreducetheriskoffireorelectricshock,donotexposethisproducttorainormoisture.

16. Verifythemeteroperationbymeasuringaknownvoltage.Ifindoubt,havethemeterserviced.

17. Toavoidfalsereadingsthatcanleadtoelectricshockandinjury,replacebatteryassoonasthelow

batteryindicatorappears.

18. De‐energizetheinstallationundertestorwearsuitableprotectiveclothingwhenplacingorremoving

thecurrentclampfromatestsetup.

19. Donotapply/removethecurrentclampto/fromUNINSULATEDHAZARDOUSLIVEconductorswhichmay

causeelectricshock,electricburn,orarcflash.

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MA44x‐en‐GB_V1.08/16

CAUTIONS

CAUTIONSidentifyconditionsandactionsthatcouldcauseDAMAGEtothemeterorequipment

undertest.Donotexposethemetertoextremesintemperatureorhighhumidity.

SafetySymbols

Thissymbol,adjacenttoanothersymbol,indicatestheusermustrefertothe

manualforfurtherinformation.

Riskofelectricalshock

Alertbeeper

Equipmentprotectedbydoubleorreinforcedinsulation

Diodesymbol

Capacitance

Batterysymbol

ConformstoEUdirectives

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ComplieswithUSAandCanadarequirements

ACmeasurement

DCmeasurement

Earthground

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MA44x‐en‐GB_V1.08/16

Description

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MeterDescription

1. Transformercurrentjaws

2. Jawopeningtrigger

3. M(Mode)button

4. BacklitLCD

5. Controlbuttons(seedescriptionsbelow)

6. COMnegativeinputterminal

7. Positiveinputterminal

8. Functionselector

9. NCValertsymbol

10. Backlightbutton(MA440)orWorkLightbutton

(MA443andMA445)

11. NCVsensor

Note:Batterycompartmentislocatedonbackofmeter

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Fig.1–MeterDescription

DisplayDescription

RelativemodeiconUnitsofFrequency

Alternating/DirectCurrentUnitsofVoltage

NegativereadingsUnitsofCapacitance

DiodemodeNon‐contactACVoltageDetect

ContinuitymodeAutomaticrangemode

DisplayHoldMaximum/Minimumreadings

UnitsofresistanceLowBatteryicon

AutoPowerOFFiconDutyCycle

Danger:HighVoltageMeasurementoverload

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ControlButtons

Modebutton:Shortpressestostepthroughthemodeoptionsfortheselected

measurementfunction

HOLDandBacklightbutton(MA443/MA445):Shortpresstofreeze/unfreezereading.

LongpresstoturnbacklightONorOFF.Notethatthebacklightbuttonisintheupper

rightsideofthemeterfortheMA440(seeSideButtondescriptionbelow)

HOLDbutton(MA440):Shortpresstofreeze/unfreezereading

(MA443/MA445only)Shortpresstoenterthemaximummeasurementmode(LCD

displays‘MAX’);pressagaintoentertheminimummeasurementmode(‘MIN’is

displayed).Longpresstoexitthismode.MAX/MINisavailableontheAC

Voltage/Current,Resistance,andTemperatureMA445functionsonly

(MA445)Shortpresstostorethedisplayedreadingasareferencevalue.Subsequent

measurementswillbedisplayedas‘measurementminusreferencevalue’.This

featureappliestoAC/DCvoltage,ACcurrent,resistance,andtemperaturemodes

only.Shortpresstoexit.ForDCcurrentmeasurementmode,shortpresstozerothe

display;theLCDwillshowthedeltasymbol.Shortpresstoexitthismode.

(MA440/MA443)Shortpresstostorethedisplayedreadingasareferencevalue.

Subsequentmeasurementswillbedisplayedas‘measurementminusreference

value’.ThisfeatureappliestoAC/DCvoltage,ACcurrent,resistance,andtemperature

modesonly.Shortpresstoexit.

(MA440only)Shortpresstotogglefrequency(Hz)anddutycycle(%)measurements

fortheVoltageandHzswitchpositions.TheMA443andMA445haveadutycycle

modeaccessibleusingtheMODEbuttonwhenthefunctiondialissettoHz%.

SIDEBUTTON ThebuttonlocatedontheupperrightsideofthemeteriseitherfortheLCD

backlight(MA440:shortpressON/OFF)orworklight(MA443/MA445:Long

pressONandshortpressOFF).

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MA44x‐en‐GB_V1.08/16

Operation

CAUTIONS

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ReadandunderstandalloftheSafetystatementslistedinthesafetysectionofthismanual

priortouse.

PoweringtheMeter

1. Movethefunctionswitchtoanypositiontopowerthemeter.Checkthebatteriesiftheunit

failstopowerON.

2. MovethefunctionswitchtotheOFFpositiontoremovepowertothemeter.

3. ThemeterhasanAutoPowerOFFfeature(APO)wherethemeterswitchesOFFafter30

minutes(MA440)or15minutes(MA443/MA445)ofinactivity.TheMA443/MA445models

emitawarningtonepriortoautomaticallyswitchingoff.

DisableAutoPowerOFF(MA443andMA445)

TodefeattheAPOfeature:

1. WiththemeterOFF,pressandholdtheM(MODE)buttonand,whilecontinuingtoholdthe

Mbutton,turntherotaryswitchtoanyposition.

2. ThemeterwillbeepfivetimesindicatingthatAPOhasbeendeactivated.

3. TheAutoPowerOFFfunctionwillnowbedisableduntilthenextcycleofpower.

4. WhenAPOisactive,theAPOsymbolisdisplayed.WhenAPOisnotactive,theAPO

symbolisnotdisplayed.

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MA44x‐en‐GB_V1.08/16

ACCurrentMeasurements

WARNING:Donothandlethemeterabovethefinger/handguardbarrier.

CAUTION:ObserveCATIII600VwithrespecttoEarthGroundfortheJaw.

1. RotatethefunctionswitchtotheACCurrentposition(forMA443andMA445or4/40

/400 fortheMA440).FortheMA440startwiththehighestrangesetting(400A)and

stepdowntolowerrangesasneeded,especiallyforsignalsthatareofanunknownrange.

2. TheAandtheACsymbolswillappearonthedisplayindicatingACAmperes(Amps).The

displayiconAUTOwillalsoappearindicatingautomaticranging.

3. Pressthejawtriggertoopentheclampjaw.

4. Positiontheclamparoundonlyoneconductor.SeeFig.2forcorrectandincorrectclamp

technique.

5. Readthecurrentinthedisplay.Thedisplaywillindicatetheproperdecimalpointand

value.

NOTES:

Toensuremaximumaccuracy,placetheconductoratthecenteroftheclamphead,otherwise

additionalerror(±1.0%)mayapply.

Donotreleasethetriggersuddenly;theimpactmayleadtoachangeinreadingssincetheHall

elementissensitivenotonlytomagnetismbutalsotoheatandmechanicalstresstosomeextent.



Fig.2–CorrectandIncorrectACAClamping

MA44x‐en‐GB_V1.08/16

DCCurrentMeasurements(MA445)

WARNING:Donothandlethemeterabovethefinger/handguardbarrier.

CAUTION:ObserveCATIII600VwithrespecttoEarthGroundfortheJaw.

CAUTION:Measureinthetemperaturerangeof0~40oConly.

1. RotatethefunctionswitchtotheDCCurrentposition.

2. TheAandtheDCsymbolswillappearonthedisplayindicatingDCAmperes(Amps).The

AUTOiconwillalsodisplayindicatingautomaticranging.

3. ZeroanyresidualmagnetismbypressingandholdingtheRELZERObuttonwithno

conductorinthejaws.SeeFig.3andFig.4

4. Pressthejawtriggertoopentheclampjaw.Positiontheclamparoundonlyone

conductor.SeeFig.2(previoussection)forcorrectandincorrectclampingtechniques.

5. Readthecurrentinthedisplay.Thedisplaywillindicatetheproperdecimalpointand

value.

NOTES:

Toensuremaximumaccuracy,placetheconductoratthecenteroftheclamphead,otherwise

additionalerror(±1.0%)mayapply.

Ifthereadingsarepositive,thecurrentisflowinginadownwarddirection(faceplatetobackof

meter).

Donotreleasethetriggersuddenly;theimpactmayleadtoachangeinreadingssincetheHall

elementissensitivenotonlytomagnetismbutalsotoheatandmechanicalstresstosome

extent.





Fig.3–DCAZerobeforemeasurementFig.4–DCAMeasurement

MA44x‐en‐GB_V1.08/16

ACandDCVoltageMeasurements

WARNING:Donotapply>600VAC/DCbetweenthemeterterminalsandground.

CAUTION:Whenconnectingthetestleadstothecircuitordeviceundertest,connect

theblackleadbeforetheredlead;whenremovingthetestleads,removetheredleadbefore

theblacklead.

1. SetthefunctionselectswitchtotheVoltageposition .

2. UsetheM(Mode)buttontoselectACorDCVoltage.

3. Inserttheblacktestleadbananaplugintothenegative(COM)jackandtheredtestlead

bananaplugintothepositive(V)jack.

4. Touchthetestprobetipstothecircuitorundertest.ForDCmeasurementsintherange

of400mV,usetheRelativemodetozerothedisplaybeforetakingameasurement.

5. ReadthevoltageintheLCD.Thedisplaywillindicatetheproperdecimalpointandvalue.

6. Relative(REL)modecanbeusedtosetareferencereadingfromwhichsubsequent

readingswillbeoffset(referencereading–actualreading=displayedreading).Long

presstheRELbuttontoactivate/deactivatetherelativemode.

7. TheMA440candisplaythefrequency(Hz)ordutycycle(%)ofthemeasuredvoltage.

ShortpresstheHz%buttontotogglefrequencyanddutycyclereadings.Forthe

MA443/MA445seethededicationsectiononFrequencyforfrequencyanddutycycle.

8. TheMA443andMA445recordMAXandMINreadings.ShortpresstheMAXMINbutton

tostepthroughtheMAXMINreadings.LongpresstheMAXMINbuttontoexit.

9. ShortpresstheHbuttontofreeze/unfreezethedisplayedreading.Longpressto

activate/deactivatethedisplaybacklight.

NOTES:TheMA440displaysOLwhentheinputexceeds1000V.TheMA443/MA445display

whenthetestedvoltageis>30Vandsoundsthebuzzerwhenthevoltageinputis>600V. 







Fig.5MA443/MA445VoltagetestFig.6–MA440Voltagetesting

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