Extech Instruments 381676A User manual

USERGUIDE



PenMultimeterwithVoltageDetector



Model381676A



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381676A-en-GB_V1.1 08/15

Introduction

ThankyouforselectingtheExtechModel381676A.ThisinstrumentmeasuresAC/DCVoltage

andCurrent,Resistance,Diode,Continuity,Logic,andincludesanon‐contactVoltageDetector

(NCV).FeaturesincludeMAXHold,DataHold,AutomaticPowerOFF(APO),andAuto/Manual

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

ofreliableservice.PleasevisittheExtechInstrumentswebsite(www.extech.com)tocheckfor

thelatestversionofthisUserGuide.



Safety

WARNING:Improperuseofthisdevicecanresultinelectricshockordamagetothe

meter.Followallsafetyguidelinespresentedinthismanualandtheusualsafety

precautionsusedwhenworkingwithelectricalcircuits.



ThisinstrumentconformstoGB/T13978‐92fordigitalMultimetertechnicalstandards,aswell

asGB4793.1‐1995(IEC‐61010‐1:2001)safetystandardsforelectronicmeasuringinstruments

withasafetycategoryofCATIII600Vandpollutiondegree2.



PreliminarySafety

Whenusingthemeter,observeallnormalsafetyrulesconcerning:

Protectionagainstthedangersofelectricalcurrent

Protectionofthemeteragainstmisuse

Whenthemeterisdelivered,checkfortransitdamage.Whencheckingvoltage,alwaystestthe

meteronaknownlivecircuitfirst.Testleadsmustbeingoodcondition.Beforeuse,verifythat

thetestleadinsulationisintactandfreefromleadwireexposureorotherdamage.Useonlythe

suppliedtestleads.

Safetyduringuse

Besuretosettheappropriatefunctionandrangebeforeuse

Neverexceedthelimitsindicatedinthespecificationtableofthismanual.

Nevertouchprobes,testleads,oralligatorclipwhenconnectedtolivecircuit.

Donotmeasurevoltageonterminalsthatexceed600Vaboveearthground.

Alwaysusecautionwhenworkingwithvoltagesabove60VDCor30VACrms.Keepfingersbehindprobe

barrierwhentakingmeasurements.

Neverconnecttestleadsacrossavoltagesourcewhiletherotaryswitchisintheresistance,continuity,or

diodemodeofoperation.

Neverperformresistance,continuity,ordiodetestsonlivecircuits.

Whentakingnon‐contactvoltagemeasurementsensurethatthepositivetestleadisNOTexposedand

thatthenegative(common)testleadisnotconnectedtothebottomofthemeter.

Beforechangingfunctionsusingtherotaryfunctiondial,besuretodisconnectthemeter’stestleads

fromanycircuitundertest.

Neverusethemeterinanexplosiveenvironmentorwheredust,dirt,orsteamexists.

Neverusethemeterifthehousingorbatterycompartmentisopen.

Donotstoremeterindirectsunlight,hightemperature/humidity,orcondensation.

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

equipmentmaybeimpaired.

ALWAYSdischargefiltercapacitorsinpowersuppliesanddisconnectthepowerwhenmakingresistance

ordiodetests.

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381676A-en-GB_V1.1 08/15

SafetySymbols

Thissymboladjacenttoanothersymbol,terminaloroperatingdeviceindicatesthatthe

operatormustrefertoanexplanationintheOperatingInstructionstoavoidpersonal

injuryordamagetothemeter.

Thissymbolindicatesthatadeviceisprotectedthroughoutbydoubleinsulationor

reinforcedinsulation.

Thissymboladvisestheuserthattheterminal(s)somarkedmustnotbeconnectedtoa

circuitpointatwhichthevoltagewithrespecttoearthgroundexceeds600V.

ControlsandJacks

1. Positivetestprobe(+)

2. Removableprobecover

3. NCValertLEDindicator

4. Logic(High/Low)LEDIndicators

5. Fingerguard

6. Rotaryfunctionswitch

7. Range(R)button

8. DataHold(H)button

9. MaximumHold(MAX)button

10. Mode(M)button

11. NCV(non‐contactvoltdetector)button

12. LCDdisplay

13. JackforCommon(negative)testlead

14. Common(negative)testlead



Note:Thebatterycompartmentislocatedontherearofthe

instrument

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DisplaySymbols

•)))AudibleContinuityVVolts

DiodefunctionOhms

LowbatteryD.HDataHold

µmicro(10‐12)AAmperes

mmilli(10‐3)(volts)DCDirectcurrent

kkilo(103)ohmsACAlternatingcurrent

MMeg(106)ohmsM.HMaximumHold

910

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381676A-en-GB_V1.1 08/15

ButtonDescriptions

ButtonOverview

BUTTONMODEDESCRIPTION

H(DataHold)AnyModePresstoholdareadingonthedisplay.

Pressandholdwhileturningthe

meterontodefeatAPO

R(Range)V,A,PresstoManuallyRange.Pressand

holdtoreturntoAUTORange

MAX(MaximumHold)AnyModePresstoholdtheMaximumreadingon

thedisplay

NCV(Non‐contactVoltageDetectorAnyModePressandholdforNon‐Contact

VoltageDetector(settheFunction

switchtoanypositionotherthanOFF)

M(Mode)V,A,,SwitchbetweenACandDC

Voltage/Current.Holddowntodo

Logicleveltesting.Switchbetween

resistance,diode,andcontinuity

ButtonDetails

DATAHOLD(H)Button

Tofreezeadisplayedreading,presstheDATAHOLD(H)button.Thereadingwillfreezeandthe

D.HdisplayiconwillbevisibleontheLCD.Toreleasethedisplay,presstheDATAHOLD(H)

buttonagain.TheD.Hindicatorwillswitchoffandthedisplaywillagainshowrealtimereadings.

MAXIMUMHOLD(MAX)Button

Todisplayonlythehighestreading,presstheMAXbutton.TheM.Hdisplayiconwillbevisible

onthedisplaywhileintheMaxHoldmode.Now,thedisplaywillonlychangewhenahigher

readingthanthedisplayedreadingisencountered.Toreturntonormaloperation,pressthe

MAXbuttonagain(theM.Hdisplayiconwillswitchoff).

MODE(M)BUTTON

TheMode(M)buttonisusedtoselectACorDCwhileintheVOLTAGE(V)orCURRENT(mA)

modes.TheMode(M)buttonisusedtoselectdiode(),Continuity(),orResistance().

PressandholdtheMode(M)buttontotakeLOGICtestswhileintheLOGICmode.

RANGE(R)Button

Themeterautomaticallyselectstheoptimumrange;however,themeter’srangescanbe

selectedmanually.WhenusingtheRange(R)buttontomanuallyselectarange,startwiththe

highestrangeandthenselectsuccessivelylowerrangesuntilthedesiredrangeisreached.The

decimalplacewillmovewitheachpressoftheRANGEbutton.PressandholdtheRange(R)

buttontoreturntotheAUTORangemode.

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381676A-en-GB_V1.1 08/15

TestLeadNotes

Thesuppliedblacktestleads(standardtestleadandalligatorclipprobe)haveprotectiveplugs

thatmustberemovedbeforebeinginsertedinthebottomofthemeter.Thisprotective

apparatusmustberemovedfromtheendoftheleadthatplugsintothemeter.

Thepositive(+)redprobecoverisusedwhenmakingCategoryIIIorhighermeasurements.

TwisttoremovethisprobecoverwhenmakingCategoryIIorlowermeasurements.



MaximumInputLimits



MeasurementsInputLimits

VoltageDCorAC200mVrange:250VDCorACrms

2~600Vrange:600VDCorACrms

CurrentDCorACFuseprotection(FF400mA/600V)

Logic,Resistance,Continuity,andDiode250VDCorACrms



AutomaticPowerOFF(APO)

Themeterisequippedwithanautomaticpowerofffeaturetopreservebatteryenergy.After14

minutesofinactivitythemeterwillemit5shortbeeps.Afteranotherminutethemeterwillemit

onelongbeepbeforefinallyturningoff.Toturnthemeteronagain,simplyrotatethefunction

switchtothedesiredfunction.

TodefeattheAPOfeature,pressandholdtheHbuttonwhileturningthemeteron.TheAPO

featurewillre‐enableafterthemeteristurnedoffagain.



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381676A-en-GB_V1.1 08/15

OperatingInstructions

WARNING:Riskofelectrocution.High‐voltagecircuits,bothACandDC,areverydangerousand

shouldbemeasuredwithgreatcare.

NOTE:OnsomelowACandDCvoltageranges,withthetestleadsnotconnectedtoadevice,

thedisplaymayshowarandom,changingreading.Thisisnormalandiscausedbythehigh‐

inputsensitivity.Readingswillstabilizeandgivepropermeasurementwhentestleadsare

connectedtoacircuit.



NON‐CONTACTACVOLTAGEDETECTOR(NCV)

WARNING:TesttheACvoltagedetectoronaknownlivecircuitbeforeeachuse.



WARNING:BeforeusingthemeterintheACVoltageDetectormode,verifythatthebatteries

arefreshbyconfirmingcharactersappearontheLCDwhenthefunctiondialisturnedtothe

voltage(V)position.DonotattempttousethemeterasanACVoltageDetectorifthebatteries

areweakorbad.

Notes:

Voltagemaystillexistevenwithnoindicationgivenbythemeter.DonotsolelyrelyonNCV

detectiontodeterminethepresenceofvoltage.Socketdesign,insulationthicknessandother

factorsmayaffectreadings.

TheNCVindicatorLEDmayflashwhilemeasuringAC/DCvoltageduetothepresenceofinduced

voltage.

ExternalenvironmentalinterferencefromadditionalsourcescanfalselytriggerNCVdetection.



1. Disconnectthecommon(negative)testleadfromthebottomofthemeter.

2. WiththefunctionswitchsettoanypositionexceptOFF,pressandholdtheNCVbutton.

3. Movethetipofthemeternearthevoltagesourceorconductorasshown.

4. Ifthevoltagedetectedis>110VAC,thebeeperwillsoundandtheNCVindicatornearthe

tipofthemeterwillflash.Alwaystestthedetectoronaknownlivecircuitfirstbefore

attemptingothertests.



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381676A-en-GB_V1.1 08/15

ACandDCVOLTAGEMEASUREMENTS

WARNING:RiskofElectrocutionforACMeasurements.Theprobetipsmaynotbelongenough

tocontactthelivepartsinsidesome240Voutletsforappliancesbecausethecontactsare

recesseddeepintheoutlets.Asaresult,thereadingmayshow0voltswhentheoutletactually

hasvoltagepresent.Makesuretheprobetipsaretouchingthemetalcontactsinsidetheoutlet

beforedeterminingthatnovoltageispresent.



CAUTION:DonotmeasureACorDCvoltageifamotoronthecircuitisbeingswitchedONor

OFF.Largesurgesmayoccurthatcandamagethemeter.



WARNING:Topreventelectricshockanddamagetothemeterorpersonalinjury,donot

measurevoltagesthatmayexceed600VDCorACrms.

NOTES:

Beforeconnectingtheprobeandtestleadatlowervoltageranges,thedisplaymayshowerratic

readings.Thisisnormalbecausethemeterishighlysensitive.Onceaconnectionismade,the

truereadingwillbedisplayed.

‘OL’indicatesanover‐rangeconditioninmanualmode.Ahigherrangeshouldthenbeselected.

Inmanualmode,selectthehighestrangefirstifthevaluetobemeasuredisunknownthenlower

therangeasneeded.

TheACmillivoltrangeisonlyavailableinthemanualrangemode.

1. UsetheprobecoverifmakingmeasurementsoncategoryIIIoraboveinstallations.

2. SetthefunctiondialtotheVposition.

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

4. Inserttheblacktestleadbananaplugintothenegativejackatthebottomofthemeter.

5. TouchtheblacktestprobetiptotheneutralsideofthecircuitforACmeasurementsorto

thepositivesideofthecircuitforDCmeasurements.

6. Touchthepositivetestprobetiptothe“hot”sideofcircuitforACmeasurementsortothe

negativesideofthecircuitforDCmeasurements.

7. Readthevoltageonthedisplay.Themeterautomaticallyselectsoptimumrangeortheuser

maymanuallyselectarangebypressingtheRange(R)button.PressandholdtheRange(R)

buttontoreturntotheAUTORangemode.







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381676A-en-GB_V1.1 08/15

ACandDCCURRENTMEASUREMENTS

WARNING:Riskofelectricshock.Topreventdamagetothemeterorpersonalinjury,never

measurecurrentwhereopencircuitvoltagesexceed250V.

NOTE:‘OL’indicatesanover‐rangeconditioninmanualmode.Ahigherrangeshouldthenbe

selected.

1. UsetheprobecoverifmakingmeasurementsoncategoryIIIoraboveinstallations

2. SetthefunctiondialtothemAposition.

3. UsetheMode(M)buttontoselectACor

DC.

4. Inserttheblacktestleadbananapluginto

thenegativejackatthebottomofthe

meter.

5. Connectthetestleadsinserieswiththe

circuitundertest.

6. Touchtheblacktestprobetiptothenegativesideofthecircuit.

7. Touchthepositivetestprobetiptothepositivesideofthecircuit.

8. Readthecurrentreadingonthedisplay.Themeterautomaticallyselectstheoptimum

rangeortheusermaymanuallyselectarangebypressingtheRange(R)button.Press

andholdtheRange(R)buttontoreturntotheAUTORangemode.



DIODETEST

NOTES:Thedisplayshowstheapproximateforwardvoltagedrop.Iftheconnectionsarereversed

ortheleadsarenotconnected,thedisplaywillshow‘OL’.

1. UsetheprobecoverifmakingmeasurementsoncategoryIIIoraboveinstallations

2. Setthefunctionswitchtotheposition.

3. UsetheMode(M)buttontoselectthediode

function 

4. Inserttheblacktestleadbananaplugintothenegative

(common)jackatthebottomofthemeter.

5. Touchthetestprobestothediodeundertest.

6. Agooddiodewillindicateapprox.0.3V(germanium

diodes)to0.7V(silicondiodes)fortheforwardtestand

“OL”forthereversetest.

7. Ashorteddiodewillindicatethesamevalueofvoltageinboththereverseandforward

testdirections.Anopendiodewillindicate“OL”inbothtestdirections.



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381676A-en-GB_V1.1 08/15

RESISTANCEMEASUREMENTS

WARNING:Toavoidelectricshock,disconnectpowertotheunitundertestanddischargeall

capacitorsbeforetakinganyresistancemeasurements.

NOTES:

‘OL’indicatesanover‐rangeconditioninmanualmode.Ahigherrangeshouldthenbeselected.

Iftheresistancemeasuredisgreaterthan1M



,themetermaytakeafewsecondstoobtaina

stablereading.Thisisnormalforhighresistancemeasurements.

Whentheleadsarenotconnectedorwhenmeasuringanopencircuit,thedisplaywillread‘OL’.



1. UsetheprobecoverifmakingmeasurementsoncategoryIIIoraboveinstallations

2. Setthefunctionswitchtotheposition.

3. UsetheMode(M)buttontoselectthe

resistancemode().

4. Inserttheblacktestleadbananaplugintothe

negativejackatthebottomofthemeter.

5. Touchthetestprobetipsacrossthecircuitor

partundertest.Itisbesttodisconnectoneside

ofthepartundertestfromthecircuitsothe

restofthecircuitwillnotinterferewiththe

resistancereading.

6. Readtheresistanceonthedisplay.Themeter

automaticallyselectstheoptimumrangeortheusermaymanuallyselectarangeby

pressingtheRange(R)button.PressandholdtheRange(R)buttontoreturntotheAUTO

Rangemode.

CONTINUITYCHECK

WARNING:Riskofelectricshock.Ensurethatallpowertothecircuitisoffandcapacitorshave

fullydischargedbeforemeasuringcontinuity.

NOTE:Iftheresistancemeasuredisgreaterthan200,thetestleadsarenotconnected,orwhen

measuringanopencircuit,thedisplaywillread‘OL’.



1. UsetheprobecoverifmakingmeasurementsoncategoryIIIoraboveinstallations

2. Setthefunctionswitchtotheposition.

3. UsetheMode(M)buttontoselecttheaudiblecontinuitymode.

4. Inserttheblacktestleadbananaplugintothenegativejackatthebottomofthemeter.

5. Touchthetestprobetipstothecircuitorwireundertest.

6. Iftheresistanceislessthanapproximately50,theaudibletonewillsound.

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381676A-en-GB_V1.1 08/15

LOGICTEST

WARNING:Topreventelectricshockanddamagetothemeterorpersonalinjury,donot

measurevoltagesthatmayexceed100VACrms.

NOTE:Ifthetestleadsaredisconnectedorifthevoltagemeasuredis<1.5VtheLEDwillbegreen.



1. UsetheprobecoverifmakingmeasurementsoncategoryIIIoraboveinstallations

2. SetthefunctionswitchtotheLOGICposition.

3. Inserttheblacktestleadbananaplugintothenegative(common)jackatthebottomof

themeter.

4. Connecttheblacktestleadtothecircuit’sground(‐)terminal.

5. HolddowntheMode(M)buttonandtouchthetestprobetothecircuitfor

measurement.TheLEDsnearthetipofthemeterwillindicatethecurrentlogiclevel.

6. Ifthemeasurementis0~1.5V,theGreenLEDwilllightandthedisplaywillshowadown

arrow,indicatingthatthelogictestresultisaLOW(‘0’)condition.

7. Ifthemeasurementis1.5~3.5V,theGreenandRedLEDswillbeOFF.

8. Ifthemeasurementis3.5~5V,theRedLEDwilllightandthedisplaywillshowanup

arrow,indicatingthatthelogictestresultisaHIGH(‘1’)condition.Seediagram.



0V 1.5V 3.5V 5V

Green LED ON Green & Red LED OFF Red LED ON

LOW ‘0’ HIGH ‘1’



Maintenance

WARNING:Toavoidelectricalshock,disconnectthetestleadsfromanysourceofvoltage

beforeremovingthebackcoverorthebatterycover.



WARNING:Toavoidelectricalshock,donotoperatethemeteruntilthebatterycoverisinplace

andfastenedsecurely.

Thismeterwasdesignedtoprovideyearsofdependableservice.However,ifthefollowing

guidelinesarenotfollowed,thedependabilityofthemetercanbecompromised:

1. KEEPTHEMETERDRY.Ifitgetswet,wipeitoffandallowittodrybeforeuse.

2. USEANDSTORETHEMETERINNORMALTEMPERATURES.Environmentalextremescan

shortenthelifeoftheelectronicpartsanddistortormeltplasticparts.

3. HANDLETHEMETERGENTLYANDCAREFULLY.

4. KEEPTHEMETERCLEAN.Wipethecaseoccasionallywithadampcloth.Donotuse

chemicals,cleaningsolvents,abrasives,ordetergents.

5. USEONLYFRESHBATTERIESOFTHERECOMMENDEDSIZE/TYPE.

6. IFTHEMETERISTOBESTOREDFORALONGPERIODREMOVETHEBATTERIES

7. Repairsshouldonlybeimplementedbytrainedpersonnel.

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