Extech Instruments MA260 Manual de usuario

USERGUIDE

200ATrueRMSOpenJawClampMeterwith

AutoSensingTechnology

ModelMA260

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MA260‐en‐GB_V1.15/15

Introduction

ThankyouforselectingtheExtechMA260200ATrueRMSOpenJawClampMeter.TheMA260

incorporatesAutoSensingwherethemeasurementtypeisautomaticallysensedandconfigured,

noneedtoturnadialtoselectthemeasurementtypeorrange.ForACVoltage,theAuto‐sense

featurealsoevaluatesinputsignalsandadjuststheInputImpedancetoeliminateeffectsofghost

voltages.

TheMA260measuresACcurrent,AC/DCVoltage,Resistance,Continuity,andDiodeandoffers

extra‐largedisplaydigits,datahold,andadisplaybacklightfunction.Thenon‐contactVolt‐

Detectionfeaturesenseselectricalsourcessafely.



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Information

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

observewarningscanresultinsevereinjury.

WARNINGS

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

Thetimedelaythatresultsfromthemeter’sautomaticsensingcircuit(1to2seconds)maycauseGFCI

circuitstoresetandbreakerstotrip.

ItisnotrecommendedtousecalibrationequipmenttotesttheMA260.Calibratorscanbedamagedif

usedtotesttheMA260.

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

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

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

equipmentmaybeimpaired.

Alwaysuseproperterminals.

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

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

Donotapplymorethantheratedvoltage/currentasmarkedonthemeter.

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

batteryindicatorappears.

Donotusethemeterinoraroundexplosivegasorvapor.

Whenusingtestleadsorprobes,pleasekeepfingersbehindthefingerguards.

Removetestleadsfromthemeterbeforeopeningthebatterycompartmentorthemetercase.

Usecautionwithvoltagesabove30VACrms,42VACpeak,or60VDC.Thesevoltagesposeashockhazard.

ProbeassembliestobeusedforMAINSmeasurementsmustberatedasappropriateformeasurement

CategoryIIIorIVaccordingtoIEC61010‐031andmusthaveavoltageratingofatleastthevoltageof

thecircuittobemeasured.

Donotexposemetertoextremesintemperatureorhighhumidity.

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

theflexiblecurrentprobefromatestsetup.

Donotapply/removetheflexiblecurrentprobeto/fromUNINSULATEDHAZARDOUSLIVEconductors

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

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MA260‐en‐GB_V1.15/15

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thataretypicallymarkedonmetersandinstructions

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

manualforfurtherinformation.

DonotapplyorremoveclampfromHAZARDOUSLIVEconductors

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

Batterysymbol

ConformstoEUdirectives

Donotdiscardthisproductinhouseholdtrash.

ACmeasurement

DCmeasurement

Earthground



PERIEC1010OVERVOLTAGEINSTALLATIONCATEGORY

OVERVOLTAGECATEGORYI

EquipmentofOVERVOLTAGECATEGORYIisequipmentforconnectiontocircuitsinwhichmeasuresare

takentolimitthetransientover‐voltagestoanappropriatelowlevel.

Note–Examplesincludeprotectedelectroniccircuits.

OVERVOLTAGECATEGORYII

EquipmentofOVERVOLTAGECATEGORYIIisenergy‐consumingequipmenttobesuppliedfromthefixed

installation.

Note–Examplesincludehousehold,office,andlaboratoryappliances.

OVERVOLTAGECATEGORYIII

EquipmentofOVERVOLTAGECATEGORYIIIisequipmentinfixedinstallations.

Note–Examplesincludeswitchesinthefixedinstallationandsomeequipmentforindustrialusewith

permanentconnectiontothefixedinstallation.

OVERVOLTAGECATEGORYIV

EquipmentofOVERVOLTAGECATEGORYIVisforuseattheoriginoftheinstallation.

Note–Examplesincludeelectricitymetersandprimaryover‐currentprotectionequipment

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MA260‐en‐GB_V1.15/15

123456

121314

Description



MeterDescription

1. Transformercurrentmeasurementjaw

2. Non‐contactVolt‐DetectionandAC/DCcontactvoltageindicator

3. BacklitMulti‐functionDisplay

4. Power/Holdbutton

5. COM(‐)Terminal

6. Voltage,Resistance(+)InputTerminal

7. Backlightbutton

8. Finger‐HandGuard

Notethatthebatterycompartmentislocatedonbackofmeter



DisplayDescription

1. Automaticmeasurementdetect

2. Lowimpedancemodeisalwaysactive

3. DataHold

4. Diodetest

5. Continuityalert

6. DCmeasurement

7. ACmeasurement

8. Voltage

9. Amperes

10. BatteryStatusinPercent

11. Resistance/Continuityohms

12. Kiloprefix

13. Maindisplaydigits

14. Batterystatus

15. Minussign

16. DANGER.Livevoltagedetected

17. AutoPowerOFF

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MA260‐en‐GB_V1.15/15

Operation

CAUTIONS



ReadandunderstandallWARNINGandCAUTIONstatementslistedinthesafetysectionofthis

manualpriortouse.NotethatthemeterPowersupintheResistance/Continuitymode.

PoweringtheMeter

1. PressthePower‐Holdbuttontopowerthemeter.Checkbatteriesifunitfailstopowerup.

2. PressandholdthePower‐HoldbuttonuntilOFFappearsonthedisplay,releasethepower

buttontopoweroffthemeter.

3. ThemeterhasanAutoPowerOFFfeature(APO)wherethemeterisswitchedOFFafter20

minutesofinactivity.Todisablethisfeatureseethefollowingsection.

Note:Themeterdisplaysthebatterycapacitywhenpoweringup.Pleasereplacethebatterywhen

thedisplayshows<10%batterypower.

DisableAutoPowerOFF

Note:ThemeterwillautopowerOFFafter20minutesofinactivity.Todefeatthisfeature,follow

thestepsbelow.

1. WiththemeterOFF,pressandholdthepowerbuttonuntilAPOflashesthree(3)times.

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

APOdisplayiconisalwaysshowingwhentheAPOfeatureisactive.

Self‐TestandRelatedCautions

ThemeterperformsaSelf‐Testroutinewhileitispoweringup.Abatterystatuspercentagevalue

appearsonthescreen,ifitreads10%orlower,replacethebatteries.

CAUTION:Donottakeameasurementwhilepoweringupthemeter.Doingsowillcausea

Self‐TestfailureandFAILwilldisplay.

CAUTION:DonotusethemeterifFAILisdisplayedontheLCD.Powerdownthemeter

andstartagain.Donotattemptmeasurementsuntilthemeterisfullypoweredup.

CAUTION:Ifthemeterisusedinthevicinityofequipmentthatisgenerating

electromagneticinterference,thedisplaymaybecomeunstableorthemeasurementdisplayed

maybewidelyinaccurate.

DisplayBacklight

WiththemeterpoweredON,pressthebacklightbuttontoswitchthebacklightONorOFF.Note

thatexcessiveuseofthebacklightwillshortenthebatterylife.

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MA260‐en‐GB_V1.15/15

VoltageMeasurements

WARNING:Donotapply>1000VAC/DCbetweenthemeter’sterminalsandearthground

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

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



ACVoltageMeasurements

WARNINGS:

Thetimedelaythatresultsfromthemeter’sautomaticsensingcircuit(1to2seconds)maycauseGFCI

circuitstoresetandbreakerstotrip.

ItisnotrecommendedtousecalibrationequipmenttotesttheMA260.Calibratorscanbedamagedif

usedtotesttheMA260.

1. Inserttheblacktestleadbananaplugintothenegative(COM)

jackandtheredtestleadbananaplugintothepositive(V/Ω)

jack.

2. Touchthetestprobetipstothecircuitundertest.

3. NotethatbecauseoftheAuto‐Sensefunctionthemeterstarts

inthecontinuity(resistance)modeand,afterseveralseconds,

enterstheVoltagemode.Thistimedelaymayprecludethe

meter’suseonsomeapplications,pleaseusecaution.

4. Readthevoltageinthedisplay.Thedisplaywillindicatethe

properdecimalpointandvalue.

5. NotethatthevoltagedetectLEDmaylightwhenACVvoltageis

measured.Themeteriscapableofmeasuringvoltagefrom

1.3VACto1000VAC.Signalsbelow1VACwilltriggerthemeter’s

alertbeeper.



InputImpedance

Theinputimpedanceisgreaterthanorequalto6Kohmsforinputvoltagesupto30V.

Theinputimpedanceincreaseswithinputvoltagetoapproximately420Kohmsat1000VAC.

ForACVoltage,theAuto‐sensefeatureevaluatesinputsignalsandadjuststheInput

Impedancetoeliminateeffectsofghostvoltages.

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MA260‐en‐GB_V1.15/15

DCVoltageMeasurements

1. Inserttheblacktestleadbananaplugintothenegative(COM)jack

andtheredtestleadbananaplugintothepositive(V/Ω)jack.

2. Touchthetestprobetipstothecircuitundertest.Besureto

observethecorrectpolarity(redleadtopositive,blackleadto

negative).

3. Readthevoltageinthedisplay.Thedisplaywillindicatetheproper

decimalpointandvalue.Ifthepolarityisreversed,thedisplaywill

show(‐)minusbeforethevalue.

4. ThemeteriscapableofdetectingDCvoltagesfrom+2.1Vto

+1000Vandfrom‐0.7Vto‐1000V.

5. Themeter’salertbeeperwillsoundashorttoneforpositiveDC

voltagemeasurementsandalongtonefornegative

measurements.

ACCurrentMeasurements

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

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

1. Positiontheclamparoundoneconductorwiththeconductorpositionedasfarintotheclamp

jawaspossible.Seeaccompanyingdiagramsforcorrectandincorrectuse.

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



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MA260‐en‐GB_V1.15/15

ResistanceMeasurements

1. Inserttheblacktestleadbananaplugintothenegative(COM)jack.

Inserttheredtestleadbananaplugintothepositive(V/Ω)jack.

2. Touchthetestprobetipsacrossthecircuitorpartundertest.Itis

besttodisconnectonesideofthepartundertestsotherestofthe

circuitwillnotinterferewiththeresistancereading.

3. Readtheresistanceinthedisplay.Thedisplaywillindicatethe

properdecimalpointandvalue.

ContinuityCheck

1. Inserttheblackleadbananaplugintothenegative(COM)jack.

Inserttheredtestleadbananaplugintothepositive(V/Ω)jack.

2. Touchthetestprobetipstothecircuitorwireyouwishto

check.

3. Iftheresistanceislessthanapproximately25Ω,theaudible

signalwillsound.Ifthecircuitisopen,thedisplaywillindicate

“OL.”.

4. Notethatthebeeperisoffwhentheresistanceis>400Ω.

Howeverthebeepermaysoundwhentheresistanceis

between25Ωand400Ω.

DiodeTest

1. Inserttheblacktestleadbananaplugintothenegative(COM)jack

andtheredtestleadbananaplugintothepositive(V/Ω)jack.

2. Touchthetestprobestothediodeundertest.Forwardvoltagewill

indicate0.4to0.8VReversevoltagewillindicate“OL”.Shorted

deviceswillindicatenear0ohmsandbeep;anopendevicewill

indicate“OL”inbothpolarities.



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MA260‐en‐GB_V1.15/15

SmartDataHold

TofreezetheLCDmeterreading,presstheholdbutton.Whiledataholdisactive,theHOLD

displayiconappearsontheLCD.Ifnosignalissensed,themeterwillflashtheHOLDiconseveral

timesandautomaticallyexittheDataHoldMode.

FromtheDataHoldmode,pressthedataholdbuttontoreturntonormaloperation.TheHOLD

iconwillswitchOFF.



Note:Dataholdisnotavailablewhennoinputisdetected.



Themeter’sbeeperwillsoundcontinuouslyandtheLCDwillflashinthefollowingtwoDataHold

instances:

1. Themeterdetectsasignaldifferentthantheheldreading.

2. Thedetectedsignalisthesameunitofmeasureastheheldreadingbutis50countsgreater

thanorlessthantheheldreading.



Non‐contactVolt‐DetectionFeature

TheNon‐contactVolt‐DetectionLEDilluminateswhenthe

meterisplacedclosetoanelectricfield.IftheLEDisnotlit,

thereisstillapossibilitythatvoltageispresenthowever.

Pleaseusecaution.



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MA260‐en‐GB_V1.15/15

Maintenance

WARNING:Toavoidelectricalshock,disconnectthemeterfromanycircuit,removethe

testleadsfromtheinputterminalsandturnOFFthemeterbeforeopeningthecase.Donot

operatewithanopencase.

CleaningandStorage

Periodicallywipethecasewithadampclothandmilddetergent;donotuseabrasivesorsolvents.

Ifthemeterisnottobeusedfor60daysormore,removethebatteriesandstorethemseparately.

BatteryReplacement

1. Removethesmall(middle)Phillipsheadscrewatthebackofthemeter.

2. Openthebatterycompartment

3. Replacethetwo1.5VAAAbatteriesobservingcorrectpolarity.

4. Re‐assemblethemeterbeforeuse

5. Safety:Pleasedisposeofbatteriesresponsibly;neverdisposeofbatteriesinafire,batteries

mayexplodeorleak;nevermixbatterytypes,installnewbatteriesofthesametype.



Neverdisposeofusedbatteriesorrechargeablebatteriesinhouseholdwaste.

Asconsumers,usersarelegallyrequiredtotakeusedbatteriestoappropriate

collectionsites,theretailstorewherethebatterieswerepurchased,or

whereverbatteriesaresold.

Disposal:Donotdisposeofthisinstrumentinhouseholdwaste.Theuseris

obligatedtotakeend‐of‐lifedevicestoadesignatedcollectionpointforthe

disposalofelectricalandelectronicequipment.



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