Extech Instruments EX350 User manual

USERGUIDE

TrueRMSDigitalMultimeters

EX350Series

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EX350TrueRMSDigitalMultimeter

EX355TrueRMSDigitalMultimeterwithTemperature

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EX35x‐en‐GB_V1.212/15

TableofContents

1.INTRODUCTION3

2.SAFETYINFORMATION4

3.DESCRIPTIONS6

4.OPERATION9

PoweringtheMeter9

DisableAutoPowerOFF9

DisplayBacklight9

DataHold9

VoltageMeasurements10

10AAC/DCCurrentMeasurements12

mA/µAAC/DCCurrentMeasurements13

Non‐ContactVoltageDetector14

ResistanceMeasurements15

ContinuityMeasurements16

CapacitanceMeasurements16

LoZACVoltageMeasurements17

VariableFrequencyVoltageMeasurements17

DiodeTest18

TemperatureMeasurements(EX355only)19

Hzand%DutyCycleTest20

RelativeMode20

MaxMinMode20

5.MAINTENANCE21

6.SPECIFICATIONS22

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1. Introduction

ThankyouforselectingtheExtechEX350SeriesMeter.

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TheEX350Seriesarefeature‐packedTrueRMSdigitalmultimeters.InadditiontostandardDMM

features,theyofferaLowImpedance(LoZ)mode,BacklitLCD,Non‐ContactVoltageDetector

thatsafelysenseselectricalsources,Variablefrequencyvoltagemeasurement,andTemperature

(EX355).

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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.

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Features

6000count(EX355)or4000count(EX350)digitaldisplay

LargebacklitLEDdisplay

TrueRMSACVmeasurements

VariableFrequencyVoltagemeasurements

LoZmodeprotectsreadingsfromghostvoltages

AutoandManualRangemodes

0.5%DCVaccuracy

AutoPowerOFF(APO)withdisablefunction

Temperaturemeasurements(ModelEX355only)withincludedtemperatureprobe

10AAC/DCcurrentmeasurements

Non‐ContactVoltageDetector

Visualandaudiblecontinuitymeasurementalert

Lowbatteryindicator

CATIII600V

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EX35x‐en‐GB_V1.212/15

2. 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.

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WARNINGS

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

Whenhandlingtestleadsorprobes,keephandsandfingersbehindthefingerguardsatalltimes.

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

UsethemeteronlyasspecifiedinthisUserGuideoraccompanyingQuickStarttoavoidcompromising

theprotectionsprovidedbythemeter.

Besuretousetheproperterminals,switchpositions,andrangeswhentakingmeasurements.

Verifythemeter’soperationbymeasuringaknownvoltage.Havethemeterservicedifthemeter

respondsunusuallyoriftherearequestionsregardingthemeter’sfunctionalintegrity.

Donotapplymorethantheratedvoltage,asmarkedonthemeter,betweenterminalsorbetweenany

terminalandearthground.

ReplaceblownfuseswithfusesofthesametypeandratingasspecifiedinthisUserGuide.

Usecautionworkingwithvoltagesabove30VACRMS,42VACpeak,or60VDC.Thesevoltagesposea

shockhazard.

Toavoidmisleadingreadingsthatcouldleadtoelectricshockandinjury,replacethebatteriesassoonas

thelowbatteryindicatorisdisplayed.

Disconnectpowertothecircuitundertestanddischargeallhigh‐voltagecapacitorsbeforetesting

resistance,continuity,diodes,orcapacitance.

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

Toreduceriskoffireorelectricshock,donotusethemeterifitiswetanddonotexposethemeterto

moisture.

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

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

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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.

Disconnectthetestleadsfromthetestpointsbeforechangingthepositionofthefunction(rotary)

switch.

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

Neversetthemetertotheresistance,diode,capacitance,orampfunctionswhenmeasuringthe

voltageofapowersupplycircuit;thiscouldresultinmeterdamageanddamagetotheequipment

undertest.

EX35x‐en‐GB_V1.212/15

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

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

manualoruserguideforfurtherinformation.

Riskofelectricalshock

Fusesymbol

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

LowBatterysymbol

ConformstoEUdirectives

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

ACmeasurement

DCmeasurement

Earthground

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PERIEC1010OVERVOLTAGEINSTALLATIONCATEGORY

OVERVOLTAGECATEGORYI

EquipmentofOVERVOLTAGE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

EX35x‐en‐GB_V1.212/15

3. Descriptions

MeterDescription(EX350pictured)

1. Non‐ContactVoltageDetectorandLED

2. LCDmulti‐functiondisplay

3. ManualRangebutton

4. Hz%button

5. ModeandLPFButton

6. Rotaryfunctionselectswitch

7. 10Ainputterminal

8. uAandmAinputterminal

9. Common(‐)inputterminal

10. Positiveinputterminal:Voltage,Resistance,Capacitance,Temperature(EX355),andµA

11. DataHoldandbacklightbutton

12. REL(RELATIVE)button

13. MAXMINbutton

*Batterycompartmentonbackofmeter

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Fig3‐1METERDESCRIPTION

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DisplayIconDescriptions

Auto:Automaticrangemode

HOLD:Displayhold

:Relativemode

AC:AlternatingCurrentMeasurements

DC:DirectCurrentMeasurements

:Maindisplaydigits

A:Amperes(Current)

V:Volts(Voltage)

oC/oF:Temperatureunits

F:Farads(Capacitancemeasurementunits)

Hz:Hertz(Frequencymeasurementsunit)

%DutyCycle(AConly)

Ω(Ohms):Resistancemeasurementunit

LPFVariablefrequencyvoltagemode

:Batterystatusicon

‐Minus(negative)sign

MAX‐MINPeakMaximumandMinimumreadingmemory

:Diodemeasurementmode

:Continuitymodesymbol

AutoPowerOffenabled

Prefixes:µ(micro:10‐6),m(milli:10‐3),n(nano:10‐9),k(kilo:103),M(mega:106)

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Fig3‐2METERDISPLAY

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EX35x‐en‐GB_V1.212/15

Push‐ButtonDescriptions



PresstheM(MODE)buttontoperformthefollowing:

SwitchPositionMODE(M)ButtonFunction

(EX355)AC DC

AC DC

Ω Ω  

TEMP(EX355)°C °F



PressandHoldLPFintheACVfunctiontoselectvariablefrequencytests.



PressR(Range)toswitchfromAutotoManualRange.HoldtoreturntoAutoRange.



PressactivatesRelative mode.



PresstoactivateMaxMinMode



PresstoturnHOLDon/off.PressandHoldtoturnbacklighton/off



PresstoselectHzor%inACVoltageorACCurrentmodes

EX35x‐en‐GB_V1.212/15

4. Operation

CAUTION:ReadandunderstandalloftheSafetystatementslistedinthesafetysection

ofthismanualpriortouse.

PoweringtheMeter

1. Turntherotaryfunctionswitchtoanypositiontopowerthemeter.Checkthebatteriesifthe

unitfailstopowerON.RefertotheMaintenancesectionforbatteryandfusereplacements.

2. TurnthefunctionswitchtotheOFFpositiontopowerOFFthemeter.

3. ThemeterhasanAutoPowerOFFfeature(APO)wherethemeterswitchesOFFafter15

minutesofinactivity.WhenAPOisenabled,theAPOicon willshowonthedisplaywhen

themeterispoweredON.TodisableAPO,refertothenextsection.

DisableAutoPowerOFF

ThemeterwillautopowerOFFafter15minutesofinactivity.Todefeatthisfeature,followthe

stepsbelow.

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

therotaryfunctionswitchtoanypositiontopowerONthemeter.

2. Themeterwillbeep5times.

3. Releasethebutton.

4. APOwillnowbedisableduntilthenextcycleofpower.

DisplayBacklight

WiththemeterpoweredON,pressandholdthebacklightbutton fortwosecondstoswitchthe

backlightONorOFF.Notethatexcessiveuseofthebacklightwillshortenthebatterylife.

Whenthepowersupplyvoltageofthebatteryfallsto2.6V,theLCDbacklightwillbefaintor

unusable;themeasurementfunctioncanbeusednormallyhowever.



DataHold

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

displayiconappearsontheLCD.PresstheHbuttontoreturntonormaloperation.TheHiconwill

switchOFF.

EX35x‐en‐GB_V1.212/15

VoltageMeasurements

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.

Forsafety,besuretomeasureaknownvoltagebeforeusingtheinstrumentonan

unknowncircuit



AC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. Turnthefunctionswitchtotheorthemposition.

3. PresstheMbuttontoselectACorDC(EX355only)

4. ThemeterdefaultstotheAutoRangemode(AutodisplayedonLCD).PresstheRbutton

toaccessthemanualrangemode.PresstheRbuttontostepthroughtheranges.Press

andholdtheRbuttontoreturntotheAutoRangemode(Autowillbedisplayed).

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

6. Readthedigitalvalueofthemeasurementinthedisplay.Thedisplaywillalsoindicate

theproperdecimalpointandmeasurementtype/unitssymbols.

7. UsetheHz/%buttontoviewthefrequency(Hz)orthedutycycle(%)ofthemeasured

voltage



Fig4‐1ACVOLTAGEMEASUREMENTS

%DutyCycleNote:DutyCyclemeasurementsare

AConlyforthismeter.Measurementsignalsmust

be‘zerocrossing’andmustreach‐0.7Vforthe

metertoproperlydisplayDutyCycle%.

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