Extech Instruments MA145 User manual

USERGUIDE

TrueRMS300AAC/DCMiniClampMeterwith

Non‐ContactVoltageDetector

ModelMA145

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MA145‐en‐GB_V1.15/15

Introduction

ThankyouforselectingtheExtechMA145300AAC/DCTrueRMSMiniClampMeterwithNon‐

ContactVoltageDetector.TheMA145issmallinsizebutruggedinperformance.



TheMA145measuresAC/DCcurrentto300AandoffersaSmartDataHoldfeature,display

Backlight,In‐rushCurrentmode,DCAZero,LowPassFiltering(LPF),andanon‐contactVoltage

Detectionfeaturethat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–PleaseReadFirst

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.

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.

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voltage.Ifindoubt,havethemeterserviced.

Donotapplymorethantheratedvoltage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.

Pleasekeepfingersandhandsbehindthefingerguards.

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currentclampfromatestsetup.

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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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.

Riskofelectricalshock

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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123 45

Description



MeterDescription

1. Transformercurrentjaw

2. Finger‐HandGuard

3. Jawopeningtrigger

4. LCDMulti‐functiondisplay

5. Push‐buttoncontrols



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



DisplayDescription

1. AutomaticACA/DCAdetect

2. Zeroicon

3. In‐RushCurrentmode

4. LowPassFilter

5. DataHold

6. ACMeasurement

7. DCMeasurement

8. Amperes(current)

9. MainDisplayarea

10. Batterystatusicon

11. Minus(negative)sign

12. Non‐ContactVoltDetecticons

ControlButtonDescription

Pressfor>2secondstoaccessIn‐rushCurrentmode

PresstoaccessLowPassFiltermode

Presstoaccesscurrentmeasurementmode.PressagaintotoggleAC/DC

PresstoaccessVoltagedetectmode

Pressfor>2secondstozeroDCAdisplay

PresstoswitchDataHoldonoroff

PresstopowerONthemeter.Pressandhold>2secondstoswitchOFF

Presstotoggledisplaybacklightonandoff

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Operation

CAUTIONS



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

priortouse.

PoweringtheMeter

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

powerON.

2. PressandholdthePowerbuttonformorethan2secondstopowerOFFthemeter.

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

minutesofinactivity.TodisableAPO,refertothenextsection.

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

DisableAutoPowerOFF

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‘V’buttonand,whilecontinuingtoholdthe‘V’

button,pressthepowerbutton.

2. ThedisplaywillshowAOFF.

3. Releaseallofthebuttons.

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

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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AC/DC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. Pressthe‘A’buttontoaccesstheCurrentmeasurementmode.TheAsymbolwillappearon

thedisplayinthelowerrighthandsideindicatingAmperes(Amps).

2. ThemetercanbeusedinAUTOmode(default)wherethemeterdetectsACorDCcurrent

automaticallyorthemetercanbeusedmanually(usethe‘A’buttontotoggleDCandAC).

3. WheninAUTOmode,thedisplayshowstheAUTOiconintheupperleftcorner.

4. ThemeterdisplaywillshowACorDContherightsideofthedisplay.

5. WheninDCCurrentmode,pressandholdZEROfor>2secondstonullthedisplaybefore

takingaDCAmeasurement.

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

7. Positiontheclamparoundonlyoneconductor.Seeaccompanyingdiagramsforcorrectand

incorrectuse.

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

InDC,Ifthepolarityisreversed,thedisplaywillshow(‐)minusbeforethevalue.



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InrushCurrentMode

IntheInrushmodethemeterwaitsuntilatleast5Aisdetectedandthenstartsa100mssample

windowinwhichtocaptureaninrushcurrentRMSvalue.Refertoillustrationbelow.

1. PressandholdtheINRUSHbuttonfor>2secondstoaccesstheInrushCurrentmode.

2. ThedisplaywillshowtheINRUSHicon.

3. Whenready,takeacurrentmeasurement.Themeterwillcapturethehighestreading

detectedduringa100mswindow.Notethatthe100mswindowdoesnotopenuntilatleast

5Aisdetected.

4. ToexittheInrushCurrentmodepresstheINRUSHbuttonagainmomentarily.TheINRUSH

iconwillswitchOFF.

TIME

CURRENT

Start Stop

Current

Detection

Threshold

Measured Inrush

Current

100ms Sample Window (60Hz)



LowPassFilter

TheLowPassFiltermodeoffershighfrequencyrejectionwhenmeasuringVariableSpeedDrives.

TheLowPassFiltermodeoffersacut‐offfrequencyof160Hz(approx.)withanattenuation

characteristicof‐24dbperoctave(approx.).

1. MomentarilypresstheLPFbuttontoaccesstheLPFmode

2. TheLPFdisplayiconisshownonthedisplayintheLPFmode

3. PresstheLPFbuttonagaintoexittheLPFmode,theLPFiconwillswitchOFF



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Non‐ContactVoltageDetectionFeature

Themeter’saudiblebeepertriggersandthedisplayshows

dasheswhenthemetersensesanelectricalvoltagefield.The

highertheelectricalfieldstrengththegreaterthenumberof

dashesdisplayedandthefastertherateoftheaudiblebeeps.

Ifthemeterdoesnotemitatoneordisplaydashesinthismode,

thereisstillthepossibilitythatvoltageispresent.Pleaseuse

caution.

1. Pressthe‘V’buttontoaccesstheNon‐ContactVoltage

Detectmode.

2. Notethevoltagedetectiondisplayiconsasshowninthe

Descriptionsectionofthisguide.

3. Placethemeternearasourceofelectricalenergy.Thetip

oftheclampoffersthehighestsensitivity.

4. Notetheaudiblebeepingandthedashdisplays.

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.PresstheHOLDbuttontoreturntonormaloperation.The

HOLDiconwillswitchOFF.

Themeter’sbeeperwillsoundandtheLCDwillflashifthedetectedsignalis50countsgreater

thantheheldreading.



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Maintenance

WARNING:Toavoidelectricalshock,disconnectthemeterfromanycircuit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Phillipsheadscrewatthelowerbackofthemeter.

2. Openthebatterycompartment

3. ReplacethetwoLR44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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MA145‐en‐GB_V1.15/15

Specifications

ELECTRICALSPECIFICATIONS

FunctionRangeResolutionAccuracy(ofreading)

50~100Hz100~400Hz

ACCurrent

60.00A0.01 ±(1.5%+25digits)<3A

±(1.5%+5digits)≥3A

±(2.5%+25digits)<3A

±(2.5%+5digits)≥3A

300.0A0.1

FunctionRangeResolutionAccuracy(ofreading)

DCCurrent

60.00A(1)0.01 ±(1.5%+10digits)(2)

300.0A0.1 ±(1.5%+5digits)

(1)<0.3Avariationwhenmeasuringinvaryingdirections

(2) Add10dtoaccuracyinAUTOAC/DCsensemode

FunctionRangeResolutionAccuracy(ofreading)50Hz/60Hz

LowPassFilter

(LPF)

60.00A0.01 ±(3.5%+25digits)<3A

±(3.5%+5digits)≥3A

300.0A0.1

Cut‐offfrequency(‐3db):160Hz(approximately)

Attenuationcharacteristic:‐24dbperoctave(approximately)

FunctionRangeResolutionAccuracy(ofreading)

InrushCurrent300.0A0.1 ±(3.5%+5digits)

Integrationtime:100ms

Triggercurrent(threshold):5A

Voltage

Detector80V~600VACn/an/a

Thetipoftheclampofferstheoptimumsensitivity

Notes:

Clamppositionerror:±1.5%ofreading

Accuracyisgivenas±(%ofreading+leastsignificantdigit)at23C±5Cwithrelativehumidity

lowerthan80%.Accuracyisspecifiedforaperiodofoneyearaftercalibration.

ACAspecificationsareforACCoupled,TrueRMS.Forsquarewavetheaccuracyfor>100Hzis

unspecified.

Fornon‐sinusoidalwaveforms,additionalaccuracyCrestFactor(C.F.)considerationsexistas

detailedbelow:

Add3.0%forC.F.1.0~2.0

Add5.0%forC.F.2.0~2.5

Add7.0%forC.F.2.5~3.0

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