Mastech MY67 Manuale utente

CONTENTS

1. SAFETY INFORMATION .1

2. DESCRIPTION .. 3

3. OPERATINGINSTRUCTION ..6

3.1MEASURINGVOLTAGE .6

3.2MEASURINGCURRENT 6

3.3MEASURINGRESISTANCE ..7

3.4MEASURINGFREQUENCY 7

3.5MEASURINGCAPACITANCE 8

3.6CONTINUITY TEST .. ...8

3.7DOIDE TEST ..8

3.9TRANSISTORTEST .9

4. SPECIFICATIONS .9

5. ACCESSORIES 13

6. BATTERY & FUSE REPLACEMENT 14

1. SAFETYINFORMATION

Thismultimeterhasbeen designed according to

IEC-1010 concerning electronicmeasuringinstruments

withanovervoltagecategory(CAT )and pollution 2.

Followall safetyand operatinginstructionstoensure

thatthemeterisused safelyand iskeptingood

operating condition.

1.1PRELIMINARY

※Whenusingthismeter,theusermustobserveall

normalsafetyrulesconcerning:

—Protection against thedangersofelectricalcurrent.

—Protection ofthemeteragainst misuse.

※Full compliancewithsafetystandardscanbe

guaranteed onlyifused withtestleadssupplied.If

necessary,theymustbereplaced withthesamemodelor

sameelectronicratings.Measuring leadsmustbein

good condition.

1.2DURINGUSE

※Neverexceed theprotectionlimitvaluesindicatedin

specificationsforeachrangeofmeasurement.

※Whenthemeterislinked tomeasurementcircuit, do

not touchunused terminals.

※Whenthevaluescaletobemeasured isunknown

beforehand,settherangeselectoratthehighest

position.

※Beforerotatingtherangeselectortochange

functions,disconnecttestleadsfromthecircuitunder

-1-

test.

※Whencarryingoutmeasurementson TVor

switching powercircuits,alwaysrememberthatthere

maybehighamplitudevoltagespulsesattestpoints

whichcandamagethemeter.

※Neverperformresistancemeasurementsonlive

circuits.

※Alwaysbecarefulwhenworkingwithvoltages

above60Vdcor30Vacrms.Keepfingersbehind the

probebarrierswhilemeasuring.

1.3SYMBOLS

Importantsafetyinformation,refertotheoperating

manual.

Dangerousvoltagemaybepresent.

Earthground

Doubleinsulation (Protectionclass )

1.4MAINTENANCE

Beforeopening themeter,alwaysdisconnecttest

leadsfromall sourcesofelectriccurrent.

Forcontinueprotectionagainstfire,replacefuse

onlywiththespecifiedvoltageand currentratings:F1:

2A/250VF2: 10A/250V

Ifanyfaultsorabnormalitiesareobserved,the

metercannotbeused anymoreandithastobe

-2-

checkedout.

Neverusethemeterunlesstheback coverisin

placeandfastened fully.

Toclean themeter,useadampclothand mild

detergentonly, donot useabrasivesorsolventson it.

2. DESCRIPTION

Thismeterisanautorangingprofessionalinstrument

with33/4digitLCD display,capableofperforming

functions:

-DC voltagemeasurement

-ACvoltagemeasurement

-DC current measurement

-ACcurrent measurement

-Resistancemeasurement

-Capacitancemeasurement

-Frequencymeasurement

-Diodetest

-Transistortest

-Audiblecontinuitytest

Names ofcomponents

1-4. buttons

5. Rotaryswitch

6. A input jack

7. mAinput jack

8. V/Ω/Hzinput jack

9. COMinput jack

10. Transistorinput jack

-3-

2.1SELECT(Functionselectionbutton)

Thisbuttonisused toselectACAorDCAmeasuring

mode.

2.2RANGE (Auto/manualrangeselectionbutton)

-4-

Thiskeyistheauto/manualkey.Poweron defaultis

automeasurement, andpress onetimetoswitchtothe

manualmeasurement. Inmanualmeasurementmode,

the systemwill jumpup onemodeforeachpress until

thehighestmode,thenreturntothelowestmodeasa

loop.Ifpressthekeyover2seconds,thesystemwill

switchbacktoautomeasurementstatus.Frequency

and capacitancemeasurementcannotusemanual

measurement. Foxexample,atvoltagerangethe

changesareasthefigure.

2.3REL(Relativevaluemeasurement)

Thebutton isforrelativevaluemeasurementexceptHz,

diodeand continuity.

Pushthebuttontogetrelativemeasurementmode,

“REL”annunciatedisplayonLCD.Butstorethe

displayed reading asareferencevalue. IntheRelative

mode,thevalueshownon theLCDisalways the

differencebetweenthestored referencevalueandthe

presentreading.Ifthenewreading isthesameasthe

referencevalue, thedisplaywill bezero.

2.4DATAHOLD

Whenthisbuttonispushed,thedisplaywill keep the

lastreading and “ ” symbolwill appearon theLCD.

Pushing it againreturnsthemetertonormalmode.

-5-

2.5INPUTJACKS

Theunithasfourinputjacksthatareprotectagainst

overload tothelimits.During use,connecttheblacktest

lead totheCOMjackandthered testlead asshown

below:

Function

Redlead

connection

Input limits

V V/Ω/Hz 1000V dcor750V rmsac

ΩV/Ω/Hz 250V dcorrmsac

V/Ω/Hz 250V dcorrmsac

μA/mA mA 500mA dcorrmsac

A A 10A dcorrmsac

μA/mA and A rangesareprotected byfuses.

3.OPERATING INSTRUCTION

3.1MEASURINGVOLTAGE

1. Connect theblacktest lead totheCOMjackandthe

redtest lead totheV/Ωjack.

2.Settherotaryswitchatthedesired V orV ~

rangepositionand connecttestleadsacrossthe

sourceorload undermeasurement.

3.Read LCD display.Thepolarityof thered connection

will beindicated whenmaking adcvoltage

measurement.

3.2MEASURINGCURRENT

1.ConnecttheblacktestleadtotheCOMjackandthe

read test lead tothemA jackforamaximumof500mA.

-6-

Foramaximumof10A, movethered lead totheA jack.

2.Setthefunctionswitchat μA, mAorArangetobe

used and push “SELECT”button toselectDCAorACA

measuring mode.

3.Connecttestleadsinserieswiththeload under

measurement.

4.Read LCDdisplay.Thepolarityofthered lead

connectionwill beindicatedwhenmaking aDC

measurement.

3.3MEASURINGRESISTANCE

1. Connect theblacktest lead totheCOMjackandthe

redtest lead totheV/Ω/Hzjack. (NOTE: Thepolarityof

redlead connection ispositive “＋”)

2.Settherotaryswitchat Ωpositionand connecttest

leadsacrosstheresistanceundermeasurement. Read

LCDdisplay.

NOTE:

1.Forresistanceabove1MΩ,themetermaytakeafew

secondstostabilizereading.

2. Whentheinputisnotconnected,i.e.atopen circuit,

thefigure “OL”will bedisplayed fortheoverrange

condition.

3.Whencheckingin-circuitresistance,besurethe

circuitundertesthasall powerremoved and all

capacitorsarefull discharged.

3.4MEASURINGFREQUENCY

1. Connect theblacktest leadstotheCOMjackand the

-7-

redtest lead totheV /Ω/Hzjack.

2.SettherotaryswitchatHzposition andconnecttest

leadsacross thesourceorload undermeasurement.

3.5 MEASURINGCAPACITANCE

1. Set therotaryswitchat desired position.

2.Beforeinserting capacitorundermeasurementinto

capacitancetesting socket, besurethatthecapacitor

hasbeen discharged fully.

3.Whenmeasuring capacitorswithshorterleads,a

testing adapterisprovided withthemeter.Insertthe

adapterintothecapacitancetestingsocketonthefront

paneltocontinuemeasurements.

WARNING!

Toavoidshock,besurethecapacitormeasuring

adapterhasbeen removed beforechanging toanother

functionmeasurement.

3.6CONTINUITYTEST

1. Connect theblacktest lead totheCOMjackandthe

redtestlead totheV/Ω/Hzjack(Note:thepolarityof

redlead connection ispositive “+”).

2.Settherotaryswitchat position andconnecttest

leadsacross twopointsofthecircuitundertesting.If

continuityexists(i.e.resistanceless thanabout50Ω),

built inbuzzerwill sound.

3.7DIODE TEST

1. Connect theblacktest lead totheCOMjackandthe

-8-

redtestleadtotheV/Ω/Hzjack.(NOTE: Thepolarityof

redlead connection ispositive“+”)

2.Settherotaryswitchat positionand connectthe

redlead totheanode, theblacklead tothecathodeof

thediodeundertesting.Themeterwill showtheapprox.

Forwardvoltagedrop ofthediode.

3.8TRANSISTORTEST

1. Set therotaryswitchat hFE position.

2.IdentifywhetherthetransistorisNPNorPNPtype

and locateEmitter,BaseandCollectorlead.Insert

leadsofthetransistortobetested intoproperholesof

thetesting socketon thefront panel.

3.LCD displaywill showtheapproximatehFEvalueat

thetest conditionofbasecurrent 10µAand Vce3.2V.

4. SPECIFICATIONS

Accuracyisspecified foraperiod ofoneyearafter

calibrationandat18°Cto28°C(64°Fto82°F)with

relativehumidityto80%.

Accuracyspecificationsaregiven as:

±% ofreading ±numberofleast significant digits.

4.1GENERAL

MAXIMUMVOLTAGEBETWEENTERMINALSAND

EARTHGROUND: 1000V DCor700 rmsAC(sine)

FUSE PROTECTION: µA, mA: F500mA/250V

A: F10A/250V

-9-

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