isweek M9803R User manual

BenchMultimeter
UsersManual
M9803R

Introduction
Thismanualcontainsinformationandwarnings, whichmustbefollowedtoensuresafeoperationand
retainthemeterinsafecondition.
WARNING
READ“SAFETY INFORMATION”BEFORE USING THE BENCH MULTIMETER
Thismultimeterisaportability4000-countinstrumentthatisdesignedforuseinthelaboratory, field
servicing, andathome, andanycircumstance. Thismultimeterfeaturecompactdesignwithrounded
cornersforeasyhandlingandhasaruggedcaseinshockresistantandfire-retardant. Andelectronic
overloadprotectionforallfunctionsandranges.
UnpackingandInspection
UponremovingyournewBenchMultimeterfromitspacking,youshouldhavethefollowingitems:
1. BenchMultimeter
2.  TestLeadsset(oneblack,onered)
3. Carryingstrap
4. PowerCord
5. InstructionManual
6. RS232CCable(tobuybyuseroptional)
Ifanyoftheaboveitemsaremissingorarereceivedinadamagedcondition, pleasecontactthe
distributorfromwhom you purchased the unit.
Ⅰ

TableofContent
CHAPTER
SafetyPrecautions ........................................................................................ Ⅳ
Safety Information Ⅴ
1. AQuickTour 1-1
SymbolExplanation 1-1
InstrumentLayout 1-2
UsingtheRotarySwitch 1-5
UsingtheHardkeys 1-6
BuzzerOutput 1-10
Low-BatteryIndication 1-10
2. MakingMeasurements 2-1
Introduction 2-1
Ⅱ
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MeasuringDCVolts 2-2
MeasuringACVolts 2-4
MeasuringACandDCAmps 2-6
MeasuringACandDCMilliamps 2-8
MeasuringCapacitance 2-10
MeasuringFrequencyandAdaptive 2-12
TestingDiodes 2-14
MeasuringResistanceandContinuity 2-16
3. Specifications 3-1
GeneralSpecifications 3-1
ResolutionandAccuracy 3-3
4. Maintenance 4-1
Introduction 4-1
ReplacingtheBattery 4-1
ReplacingtheFuse 4-2
ReplacingthePowerFuse 4-3
OtherNote 4-4
Ⅲ
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Safety Precautions
Injuryordeathcanoccurevenwithlowvoltagesandlowcurrent.Itisextremelyimportantthatyouread
thesesafetyinformationbeforeusingyourmultimeter. Followallsafetypracticesandproperoperating
proceduresforequipmentbeingtested.
1.  Exercise extreme caution when: Measuring voltageabove20volts,measuringcurrentgreaterthat10
mA,measuringACpower line with inductive loads, measuringACpowerlineduringelectricalstorms.
2.  Alwaysinspectyourmultimeter,testleadsandaccessoriesforsignofdamageorabnormalitybefore
everyuse.Ifanyabnormalconditions exist (i.e., brokenordamagedtestleads,crackedcase,displaynot
reading,etc.),donotattempttotakemeasurements.
3. Nevergroundyourselfwhentakingelectricalmeasurements. Donottouchexposedmetalpipes,
outlets,fixtures,etc.,whichmightbeatgroundpotential.Keepyourbodyisolatedfromgroundbyusing
dryclothing,rubbershoes,rubbermats,oranyapprovedinsulatingmaterial.
4. Nevertouchexposedwiring, connections, testprobetips, orany live circuit conductorswhen
attemptingtomakemeasurements.
5. Neverreplacetheprotectivefuseinsidethemu ltimeterwithafuse otherthanthespecifiedor
approvedequalfuse. Replaceonlywithsame type of fuses. To avoidelectricalshock,disconnectthetest
leadsandanyinputsignalsbeforereplacingthefuses.
6. Replaceonlywithsametypeofbattery.Toavoi delectricalshock,Disconnectpowercordfromlive
powersource,andthetestleadsandanyinputsignalsbeforereplacingthebattery. 
Ⅳ

8. Measuringvoltagethat exceeds the limitsofthemultimeter may damage the meter and exposethe
operatortoashockhazard.Alwaysrecognizethemetervoltagelimitsas statedonthefrontofthemeter.
9.  Neverapplymorethan500VDCbetweentheCOMjackandearthground.
10.Nevertouchavoltagesourcewhenthetestleadsarepluggedintoacurrentjack.
11. Whentestingforthepresenceof voltageorcurrent, makesurethevoltageorcurrentranges are
functioningcorrectly. Takeareadingofaknownvoltageorcurrentbeforeassumingazeroreading
indicatesnocurrentorvoltage.
12.Donotattemptcalibrationorserviceunlesstrainedandanotherperson capableofrenderingfirstaid
andresuscitationispresent.
13.Remember:ThinkSafety,ActSafely.
Safety Information
ThemultimetercomplieswithProtectionClassⅡ, OvervoltageCATⅡ of theIEC61010-1(EN61010-1).
Pollutiondegree2inaccordancewithIEC-664indoor use. Iftheequipmentis used in a mannernot
specified,theprotectionprovidedbytheequipmentmaybeimpaired.
Ⅴ
7.  Donotoperatethismultimeterinanexplosiveatmosphere(i.e.,in the presence of flammable gases
orfumes,vaporordust.)

Chapter1
AQuickTour
SymbolExplanation
Earth(ground )TERMINAL
AC-Alternatingcurrent
DC -Directcurrent
Audiblecontinuity
Equipment protectedthroughout by Double Insulation ( Protection Class Ⅱ)
1-1
Caution
Caution,Possibility of electric shock

InstrumentLayout
Figure1-1.  BenchMultimeterFeatures(Forward)
1-2

Figure1-2.  BenchMultimeterFeatures(Backward)
1-3

1. V ΩHz   Volt,Ohms,Diode,Frequency InputTerminal
Thisisthepositiveinputterminalforallfunctionexceptcurrent measurements.Connectionismadeto
usingtheRedtestlead.
2. COM Common Terminal
Thisisthenegative(ground)inputterminalforallmeasurementmodes.Connectionismadetousingthe
Blacktestlead.
3. mA MilliampInputTerminal
Thisisthepositiveinputterminalforcurrentmeasurement(ACor DC) up to 400 mA. Connection is made
tousingtheRedtestlead.
4. A 10 AmperesInputTerminal
Thisisthepositiveinputterminal for current measurement(ACorDC) up to 10A. Connection is made to
usingtheRedtestlead.
5. Function/RangeSelectorRotary Switch
Thisrotaryswitchselectsthefunction,andselectsthedesiredrange.
6. Function/RangeSelectorButtons
1-4
Thisbuttonsselectsthefunction,andselectsthedesiredrange.

7. TheLCDDisplay
TheLCDdisplayindicatesthemeasuredvalueofasignal,functionmode,andannunciator.
8. TheBattery Cover
9. SupplyPowerInletwithFuse
WARNING
Toavoiduserforinjury and the multimeter for damage, the voltge valueofAC
powermustbeexaminedwithsamethepowerrequirementsofmultimeter
beforeconnectpowercordtolivepowersourceandtheswitchisturnedon.
ThisswitchisusedtoturnACPoweronoroff.WhentheACPowerison,theDCPowerisautoturned
off.
10. Thepowerswitch
11. RS232CSocket(tobuybyuseroptional)
UsingtheRotarySwitch
Turnthemultimeteronbyrotatingtherotaryswitchtoanyfunction.
1-5

UsingtheButtons
TheButtonsarepushtypeswitch.Thefunctionsareasfollows:
1. BACKLIGHTButton
Youcanturnthebacklightonoroffbypress button. Whenthebatteryisturned, thebacklight
turnedonovereithersecond,thebacklightisautoturnoff. 
2. FUNCTIONSELECTORButton
IntherangeofMeasuringResistanceandContinuity, TheResistance orContinuitymeasurementis
changedalternativelybyeachpress button.
Intherange of Measuring FrequencyandAdaptedTest, TheFrequency orAdaptivemeasurementis
changedalternativelybyeachpress button.
IntherangeofMeasuringDCandACAmps, TheDCAmps orACAmpsmeasurementischanged
alternativelybyeachpress button.
IntherangeofMeasuringDCandACMilliamps, TheDCMilliamps orACMilliampsmeasurementis
changedalternativelybyeachpress button.
3.Date Hold: HOLDButton
Press buttontotoggleinandoutoftheDateHoldmode, exceptifmultimeterisalreadyinthe
Min/MaxRecordingHoldmode.
1-6

IntheDateHoldmode,the"    "annunciatorisdisp layedandthelastreadingisheldonthedisplay,the
beeperemitsatone.
Pressing      buttonwhenmultimeterisintheDateHoldmodecausesittoexitDateHoldandenterthe
Min/MaxRecordingHoldmode.
IntheMin/MaxRecordingHoldmode,press     b uttonstoptherecordingof readings,press
againtoresumerecording.
However, themultimeterisoperatingeventhoughinDateHoldstatus, therefore, thebuzzersoundis
comeoutwhenoccurthe over rangeorcontinuitymodes.Andtherangeisalsochangedifitisinauto
range.
4.Delay Data Hold: DELAYHOLDButton
When button ispressedover eightsecond,totoggleinandout of the Date Holdmode,andthe
"    "annunciatorturnsonoroff.
5. Min/Max RecordingHold: MIN/MAXButton
Press button toentertheMin/MaxRecordingHoldmode.Theminimum,maximumvaluesarethen
resettothepresentinput,thereadingsarestoredin memory, and the " "annunciatorturnson.Push
thebuttontocyclethroughtheminimum ( MIN ), themaximum ( MAX ), andpresentreadings. The
"MIN"or "MAX"annunciatorturnsontoindicatewhatvalueisbeingdisplayed.
1-7

IntheMin/MaxRecordingHoldmode, press buttontostoptherecordingof readings, press
againtorestartrecording.Ifrecordingisstopped, theminimum,maximum,orpresentvaluesandanalog
displayarefrozen. IntheMin/MaxRecordingHoldmode, whenanewminimumvalueisexceedthe
actualminimumreadingsoranewmaximumvalueisoverload,theminimumormaximumvaluewillheld
onthedisplay,buttheanalogdisplaycontinuestobeactive.
Incaseofintheauto-range,themodeisheldtojustbeforerange.
6.Relative Display: RELButton
Press      buttontoentertheRelativeDisplaymode,the" REL"annunciatorturnson,zerothedisplay,
andstorethedisplayedreadingasareferencevalue.
IntheRelativeDisplaymodemode, thevalueshownontheLCDisalwaysthedifferencebetweenthe
storedreferencevalue and the presentreading.Ifthenewreadingisthesameasthereferencevalue,
thedisplaywillbezero.
Thebargraphisdisplayedabsolutevalue,notrelativevalue.Andtheover-rangealsooccuragainstthe
absolutevalue.
Incaseoftheautorange,the range is held just before range.
Pressandholddownthe      button for over one second, to exittherelativemode.
1-8

8.Data Memory: MEMSTOButton
Press     buttontoentertheDataMemorymodeandturnonthe""MEM annunciator,allofdisplay
dataisstoredinthememory.ThestoreddatacanbereadoutanddisplayontheLCD,thenbecomesthe
DataRecallHoldmode.
9.Data Recall Hold: MEMRCLButton
Press      buttontoentertheDataRecallmode,andturnonthe""MEM and ""annunciator,The
storeddatacanbereadoutanddisplayontheLCD,then becomes the DataRecallHoldmode.
Duringthestoreddatainthememorydisplay,the""MEM annunciator is blinking. And the DataRecall
Holdmodeisreleasedbypressing  button or button.
Press      buttontoselecttheManualRangemodeandturnoffthe""AUTO annunciator.
7. RANGEButton
IntheManualRangemode, eachtimethe buttonispressed, therange (andtheinputrange
annunciator)increments,andanewvalueisdisplayed. 
ToexitTheManualRangemodeandreturntoautoranging,pressandholddown      buttonoverone
second.The""AUTO annunciator turnsbackon.
TheDC V, AC V, Resistance and Capacitancemeasurementarealways first set to the autorange. 
Thefrequencymeasurementisalwayssettotheautorange. 
TheContinuity,Diode,ADP,DCAandACAmeasurementarealwaysfixedtherange.
Whenpower is turned-on, default range is selected.
1-9

10. RS232CButton(Thefunctionofcommunicationisoptionalbyuser.)
Press      buttontoenterthecommunication.YouwillfindthattheRS232Csignbeitlitonthedisplay.
Fixedonesideofcabletothemeterandconnectthe9pin?sterminalof cable to communicationport1or
port2ofpersonalcomputer. 
Executethesoftwaretotakethedataforyounecessary.
BuzzerOutput
2kHzbuzzersoundisoutputinfollowingcases:
1.  Whenoperatethekey.
2.  Whenoccurtheover-range.Except the measurement mode of Resistance(Ω),Frequency( Hz ),
Continuity(    )andDiode( ).
3.  Whenthecontinuitymeasurementresultislessthan40Ω.
4.  Whentherelativemodeisreleased.
5. Whenthemodeischangedfrommanualtoautor angebyoperatingthe . Pleasereferthe
timingchartforthetiming.
LowBatteryIndication
The "" markisdisplayedwhenthebattery load voltage dropsbelowaccurateoperatinglevel.
1-10

Chapter2
MakingMeasurements
Introduction
WARNING
Toavoiduserforinjury and the multimeter for damage, the voltge valueofAC
powermustbeexaminedwithsamethepowerrequirementsofmultimeter
beforeconnectpowercordtolivepowersourceandtheswitchisturnedon.
Beforemakinganymeasurementsalwaysexaminethemultimeterandaccessoriesusedwiththe
multimeterfordamage,contamination(excessivedirt,grease,ect.) and defects.Examinethetestleads
forcrackedorfrayedinsulationandmakesuretheleadplugsfitsnuglyintothemultimeterjacks.Ifany
abnormalexistdonotattempttomakeanymeasurements.
2-1

MeasuringDCVolts
Figure2-1.  DCVoltsMeasurements
2-2

WARNING
Toavoidpossibleelectricshock, multimeterdamageand/orequipment
damage,donotattempt to takeanyvoltagemeasurementsif the voltageis
above1000VDC / 750VACRMS. 1000VDC / 750VACRMSarethe
maximumvoltagesthat this multimeterisdesignedtomeasure.
1.  InserttheblackandredtestleadsintotheCOM and VΩHz input terminals respectively.
2.  SelectthedesiredDCvoltagerange,orsetautomaticrange.
3.  Whenthemagnitudeofthevol t agetobemeasuredisunknown,always start with the highest range.
4. Connectthetestleadtips in parallelwiththecircuittobemeasured. Becarefulnottotouchany
energisedconductors.Notethereading.
5.  ForDCvoltagereadings,ther edleadtipshouldbeconnectedtothepositivesideofthecircuit,the
blackleadtothenegativeside.Aminussignontheleft-handsideoftheLCDwillappearifthe leads are
connectedtheorderwayround.
6.  Whenallmeasurementsarecompleted,disconnectthetestleadsfromthecircuitundertest.Remove
testleadsfromthemultimeter.
①.  TurntheSelectorto VoltsDC.
②.  Connecttheleadsasshown.
③. is notavailableinVo ltsDC;allotherbuttonscanbeused.
2-3

MeasuringACVolts
Figure2-2.  ACVoltsMeasurements
2-4