Mastech MY-65 Manuale utente

MY-65 41/2-DIGITDIGITALMULTIMETER

UsersManual

ReadtheUsersManual thoroughlybeforeuse.

WARRANTY

Thisinstrument iswarrantedtobefreefromdefectsin materialandworkmanshipforaperiod of

oneyear.Anyinstrumentfound defectivewithinoneyearfromthedeliverydateandreturnedto

thefactorywithtransportation chargesprepaid,will berepaired,adjusted,orreplacedatno charge

to theoriginalpurchaser. Thiswarrantydoes not coverexpandableitemssuchasbatteries orfuses.

Ifthedefecthas beencausedbyamisuseorabnormaloperatingconditions,therepairwillbe

billedatanominal cost.

SAFETYINFORMATION

UT30Bdigitalmultimeterhas beendesignedaccordingtoIEC-1010concerning electronic

measuringinstrumentswithanovervoltagecategory(CAT )andpollution2.

Full compliance withsafetystandardscanbeguaranteedonlywithtestleadssupplied.Ifnecessary,

theymust bereplacedwiththetypespecifiedinthemanual.

ELECTRICALSYMBOLS

AC(Alternating Current)

DC(Direct Current)

Importantsafetyinformation.Referto themanual.

Dangerousvoltagemaybepresent.

Earth ground

Fuse

ConformstoEuropeanUniondirectives

Doubleinsulated

WARNING

Toavoid possibleelectricshockorpersonalinjury,follow theseguidelines:

l Donot usethemeterifit isdamaged.Beforeyouusethemeter,inspectthecase.Pay

particularattentionto theinsulationsurroundingtheconnectors

l Inspectthetestleadsfordamagedinsulation orexposedmetal. Checkthetestleadsfor

continuity. Replace damagedtest leadsbeforeyou usethemeter.

l Donot use themeterifitoperates abnormally.Protection maybeimpaired.Whenindoubt,

havethemeterserviced.

l Donotoperatethemeteraroundexplosivegas, vapor, ordust.

l Donotapplymorethantheratedvoltage,as markedon themeter,betweenterminalsor

betweenanyterminalandearth ground.

l Beforeuse, verifythemeter soperation bymeasuringaknown voltage.

l Whenservicing themeter,use onlyspecifiedreplacement parts.

l Use withcaution whenworking above30Vac rms, 42V peak,or60Vdc.Suchvoltages pose

ashockhazard.

l Whenusing theprobes,keepyourfingersbehindthefingerguardsontheprobes.

l Connectthecommontestleadbeforeyouconnectthelivetestlead.Whenyoudisconnect

testleads,disconnect thelivetestleadfirst.

l Removethetestleadsfromthemeterbeforeyou openthebatterydoor.

l Donotoperatethemeterwith thebatterydoororportionsofthecoverremovedorloosened.

l Toavoidfalsereadings,whichcouldleadtopossible electricshockorpersonalinjury,

replacethebatteries as soon as thelow batteryindicator( )appears.

CAUTION

Toavoid possibledamageto themeterorto theequipmentundertest, follow these guidelines:

l Disconnectcircuitpoweranddischargeall high-voltagecapacitorsbeforetesting resistance,

continuity, diodes, orcapacitance.

l Use theproperterminals,function,andrangeforyourmeasurements.

l Beforemeasuring current,checkthemeter sfuses andturnpowerOFFtothecircuit before

connecting themeterto thecircuit.

l Beforerotatingtherangeswitchtochangefunctions,disconnecttestleadsfromthecircuit

undertest.

l Beforeattemptingtoinserttransistorsfortesting,alwaysbesurethatthetest leadshavebeen

disconnectedfromanymeasurement circuits.

MAINTENANCE

l Beforeopening thecase,alwaysdisconnect thetest leadsfromall livecircuits.

l Forcontinueprotectionagainstfire,replace fuse onlywith thespecifiedvoltageandcurrent

ratings:F250mA/250V(Fast Blown)

l Periodicallywipethecase withadampclothandmilddetergent.Donotuse abrasivesor

solvents.

INTRODUCTION

MY-65 Digital Multimeterisahandheld41/2-digit LCDdigitalmultimeterwiththeadvantages of

precisionreadingand stableperformanceetc.,and canbeusedforthe measurement ofDC voltage,

ACvoltage,DCcurrent,ACcurrent,resistance,capacitance, diode,frequencyandcontinuity.It is

anideal instrument foruse inthefield, laboratory,workshop,and home.

FRONTPANEL

1.Powerswitch

2.LCD

3.Input jack

GENERALSPECIFICATIONS

l Display:33/4-digit LCD,Max. reading 3999

l Automaticpolarityindication, “-”displayedfornegativepolarity

l Automaticover-rangeindicationwith figure “1”displayed

l Auto power-off

l Operatingtemperature:0℃～50℃

l Storagetemperature:-40℃～60℃

l Low batteryindication: symbol “”displayedontheupperleft oftheLCD.

l Dimensions:70(W)×155(L)×39(H)mm

l Weight:approx. 250g

SPECIFICATIONS

Accuracyisspecifiedforaperiodof oneyearaftercalibrationandat18℃～28℃with relative

humidityto75%.

Accuracyspecificationstaketheformof:

±([%ofReading]+[numberofLeast Significant Digits])

DC VOLTAGE

RangeResolution Accuracy

200mV0.01mV ±(0.05%+3)

2V 0.1mV ±(0.1%+3)

20V1mV ±(0.1%+3)

200V 10mV ±(0.1%+3)

1000V 0.1mV ±(0.15%+5)

Inputimpedance: 10MΩ

Overloadprotection:Range200mV:250Vdcorac rms

Otherranges:700Vrmsor1000Vpeak

AC VOLTAGE

RangeResolution Accuracy(50～60Hz)Accuracy(40～1000Hz)

2V 0.1mV ±(0.5%+10) ±(1.0%+10)

20V 1mV ±(0.6%+10) ±(1.0%+10)

200V10mV ±(0.6%+10) ±(1.0%+10)

700V0.1V ±(0.8%+15) ±(1.2%+15)

InputImpedance: 2MΩ

Overloadprotection:700Vrmsor1000Vpeak

Indication: Average(rmsofsinewave)

DC CURRENT

RangeResolution Accuracy

2mA0.1µA ±(0.5%+5)

20mA1µA ±(0.5%+5)

200mA10µA ±(0.8%+5)

10A 1mA ±(2.0%+10)

Overloadprotection:250mA/250Vfused(range10Aunfused)

Max.inputcurrent: 10A(Cannot last formorethan10seconds.)

AC CURRENT

RangeResolution Accuracy

2mA0.1µA ±(0.8%+10)

20mA1µA ±(0.8%+10)

200mA10µA ±(1.2%+10)

10A 1mA ±(2.5%+10)

Overloadprotection:250mA/250Vfused(range10Aunfused)

Max.inputcurrent: 10A(Cannot last formorethan10seconds.)

Frequency:40Hz～1000Hz

Indication: Average(rmsofsinewave)

RESISTANCE

RangeResolution Accuracy

200Ω0.01Ω±(0.5%+10)

2KΩ0.1Ω±(0.3%+5)

20KΩ1Ω±(0.3%+2)

200KΩ10Ω±(0.3%+2)

2MΩ100Ω±(0.3%+2)

20MΩ1KΩ±(0.5%+2)

200MΩ10KΩ±[5.0%(rdg-1000)+10 ]

Overloadprotection:250Vac rms

Note:In range200MΩ,it isnormalthatnumber1000 isdisplayedontheLCDwhenthetest

leadsisshorted,andthenumbermustbesubtractedfromthereadingwhilemakingmeasurement.

CAPACITANCE

RangeResolution Accuracy

2000pF0.1pF ±(4.0%+10)

20nF1pF ±(4.0%+10)

200nF10pF ±(4.0%+10)

2µF100pF ±(4.0%+10)

20µF1nF ±(4.0%+10)

FREQUENCY

RangeResolution Accuracy

20KHz1Hz ±(1.5%+5)

Overloadprotection:250Vac rms

Inputvoltage:200mV～10Vrms

AUDIBLE CONTINUITY

RangeDescription

Iftheresistanceundermeasurement isless 70Ω,thebuilt-inbuzzerwill

sound.

OPERATINGINSTRUCTION

MEASURINGVOLTAGE

1.Connect theblacktestleadtothe “COM”jackandtheredtestleadto the “VΩHz”jack.

2.Settherotaryswitchto thedesiredV~orV rangeandconnectthetestleadstothesource

orloadto bemeasured.

3.Whenonlythefigure “1”isdisplayedon theLCD,it indicates that thevoltageunder

measurement isover-rangeandtherotaryswitchmust besetto higherrange.

MEASURINGCURRENT

1.Connect theblacktestleadtothe “COM”jackandtheredtestleadto the “mA”jackforthe

current upto200mAorto the “A”jackforthecurrentbetween200mAand 20A.

2.Settherotaryswitchto thedesiredA~orA rangeandconnectthetestleadsinseries with

theloadundermeasurement.

Thepolarityoftheredleadconnection will bedisplayedalongwith thecurrent valuewhen

making DCcurrentmeasurement.

3.Whenonlyfigure “1”isdisplayed, it indicates thecurrent undermeasurementisover-range

and therotaryswitchmustbesettohigherrange.

MEASURINGFREQUENCY

1.Connect theblacktestleadtothe “COM”jackandtheredtestleadto the “VΩHz”jack.

2.Settherotaryswitchto the “20KHz”rangeand connectthetestleadsto thesource orload

undermeasurement.

NOTE:

l Iftheinput voltageisabove10Vrms,youmayreadthefrequencyfromtheLCD,but

theaccuracyofthereading isnotguaranteed.

l It isbettertouse shieldcableformeasuringsmall signalto avoidinterference.

MEASURINGRESISTANCE

1.Connect theredtest leadtothe “VΩHz”jackand theblacktestleadtothe “COM”jack.

2.Settherotaryswitchto thedesired Ωrange.

3.Connect thetest leadstotheresistorto bemeasuredand readthevaluedisplayedontheLCD.

4.Whilemeasuringin-circuitresistance,disconnectedcircuit poweranddischargeall

high-voltagecapacitorsbeforemeasuring.

MEASURINGCAPACITANCE

1.Settherotaryswitchto thedesiredFrange.

2.Beforeinsertingthecapacitortobemeasuredintothecapacitancetestingsocket, besurethat

thecapacitorhas beenfullydischarged.

3.Whenmeasuringcapacitorswithshorterleads,atestingadapterisprovidedwith themeter.

Inserttheadapterintothecapacitance testingsocketonthefront paneltocontinuethe

measurement.

WARNING

Toavoidelectricshock,besurethecapacitormeasuring adapterhas beenremovedbefore

changing toanotherrange.

TESTINGDIODE

1.Connect theblacktestleadtothe “COM”jackandtheredtestleadto the “VΩHz”jack.

2.Settherotaryswitchtothe “”rangeandconnecttheredtestleadtotheanodeof the

diodetobetestedandtheblacktestleadtothecathodeof it. Themeterwillshowtheapprox.

forwardvoltagedrop ofthediode.Iftheconnection isreversed,onlyfigure “1”willbe

displayed.

TESTINGTRANSISTOR

1.Settherotaryswitchto the “hFE”range.

2.DeterminewhetherthetransistortobetestedisNPNorPNP,andlocatetheE,BandCleads.

Inserttheleadsofthetransistorintotheirproperholes ofthetransistortestingsocket.

3.Themeterwillshow theapprox.hFEvalueatthetestcondition ofIb≈10μAandVce≈

3.2V.

CONTINUITYTEST

1.Connect theblacktestleadtothe “COM”jackandtheredtestleadto the “VΩHz”jack.

2.Settherotaryswitchto “ ” rangeandconnectthetestleadstothetwoterminalsofthe

circuit tobetested. If theresistance isless thanabout70Ω, thebuilt-in buzzerwillsound.

Battery&Fuse Replacement

If “”appearson theLCD,it indicates thatthebatteryshouldbereplaced.Toreplacethe

battery,openthecaseandreplacetheexhaustedbatterywith theratingsspecified: 9V,NEDA

1604 or6F22.

Thefuserarelyneedstobereplacedandisblownas aresult oftheoperator serror. Toreplace the

fuse,openthecase andreplace theblownfusewith theratingsspecified: F250mA/250V.

Toreplace batteryorfuse,removethe2screwsinthebottomofthecaseand openthecase.

Replacethebatteryorfuse withanewoneofthesame rating.Close case andtightenscrews

completely.

ACCESSORIES

UsersManual1copy

TestLeads1pair

9VBattery(NEDA1604or6FF22) 1piece

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