Mastech MS8221 Manual de usuario

CONTENTS

1. SAFETYINFORMATION .1

2. DESCRIPTION ..4

3. SPECIFICATIONS .6

4. OPERATINGINSTRUCTION ..9

4.1Voltagemeasurement ...10

4.2Current measurement 10

4.3Resistancemeasurement .....12

4.4Diodetest .12

4.5Continuitytest .13

4.6Temperaturemeasurement ...13

4.7Batterytest ..14

4.8Transistormeasurement 14

5. MAINTENANCE ...15

User'sManual

Mastech MS8221

1. SAFETYINFORMATION

WARNING

To ensuresafeoperation,and inorderto

exploittothefullthefunctionalityofthemeter,

please followthedirectionsinthissection

carefully.

Thismultimeterhasbeen designed according to

IEC-1010 concerning electronicmeasuring instruments

withanovervoltagecategoryCATII 1000V,CATIII

600Vandpollution 2.

Followall safetyand operating instructionstoensure

thatthemeterisused safelyand iskeptingood

operating condition.

Withproperuseandcare, thedigitalmeterwill giveyou

yearsofsatisfactoryservice.

1.1PRELIMINARY

-Whenusing themeter,theusermustobserveall

normalsafetyrulesconcerning:

Protection against thedangersofelectricalcurrent.

Protection ofthemeteragainst misuse.

-Whenthemeterisdelivered,checkthatithasnot

been damagedintransit.

-Whenpoorconditionunderharshpreservation or

shipping conditionscaused,inspectandconfirmthis

meterwithout delay.

-Testleadsmustbeingood condition.Beforeusing

-1-

verifythattheinsulation ontestleadsisnot

damagedand/ortheleadswireisnotexposed.

-Full compliancewithsafetystandardscanbe

guaranteed onlyifused withtestleadssupplied.If

necessary,theymustbereplaced withthesame

modelorsameelectricratings.

1.2DURINGUSE

-Beforeusing,you mustselecttherightinputjack,

functionand range.

-Neverexceed theprotectionlimitvaluesindicated in

specificationsforeachrangeofmeasurement.

-Whenthevaluescaletobemeasured isunknown

beforehand,settherangeselectoratthehighest

position.

-Donotmeasurevoltageifthevoltageonthe

terminalsexceeds1000Vaboveearthground.

-Alwaysbecarefulwhenworkingwithvoltagesabove

60VDC or30VACrms,keepfingersbehind the

probebarrierswhilemeasuring.

-Beforerotatingthetransformswitchtochange

functionsand ranges, disconnect test leadsfromthe

circuit undertest.

-Neverperformresistance,temperature,transistor,

diodeand continuitymeasurementsonlivecircuits.

-Neverusethemeterunderthecondition ofthe

explosiveair, steamordirt.

-Ifanyfaultsorabnormalitiesareobserved, themeter

-2-

cannotbeused anymoreandithastobechecked

out.

-Neverusethemeterunlesstherearcaseisinplace

and fastened fully.

-Pleasedonot storeorusemeterinareasexposed to

directsunlight, high temperature,humidityor

condensation.

1.3SYMBOL

1.4MAINTENANCE

-Pleasedonotattempttoadjustorrepairthemeterby

removingtherearcasewhilevoltageisbeingapplied.

Atechnician whofullyunderstandsdangerinvolved

shouldonlycarryout suchactions.

-Beforeopening thebatterycoverorcaseofthemeter,

alwaysdisconnect test leadsfromall tested circuits.

-Toavoidthewrong reading causingelectricityattack,

when themeterdisplays“

”,youmustchangethe

Caution:refertotheinstruction manual.

Incorrectusemayresultindamagetothe

deviceoritscomponents.

Earth

Thisinstrument hasdoubleinsulation.

Fuse: F200mA/250V

-3-

battery.

-Forcontinueprotectionagainstfire,replacefuseonly

withthespecified voltageand currentratings:F

200mA/250V (quickacting).

-Donotuseabrasivesorsolventsonthemeter,usea

dampclothandmilddetergent only.

-Alwaysset thepowerswitchtotheOFF positionwhen

themeterisnot inuse.

-If themeteristobestored foralong period of time,the

batteriesshouldberemoved toprevent damagetothe

unit.

2. DESCRIPTION

-Thismeterisaportableprofessionalmeasuring

instrument withhandsomeLCDeasilyreading.

-Singleoperationofatransformswitchmakes

measurementconvenient. Overload protection and

lowbatteryindicationareprovided,thismeteris

idealforuseinthefields,workshop,school,hobby

and homeapplications.

-Thismeteriswiththefunctionsofdatahold.

NAMEOFCOMPONENTS

1. LCD display

2. Holdkey

3. Rotaryswitch

-4-

4. hFE socket (exceptMS8221D)

5.Terminals

-5-

3. SPECIFICATIONS

3.1GENERALSPECIFICATIONS

-Environment conditions:

600V CAT.III and 1000V CAT.

Pollution degree: 2.Altitude<2000m.

-Operating temperature:

0~40OC(32 to104 ), (<80% RH, non-condensing)

-Storagetemperature:

-10~50 OC(14 to122 ), (<70% RH, batteryremoved)

-TemperatureCoefficient:

0.1×(specifiedaccuracy)/OC(<18OCor>28OC)

-MAX. Voltagebetween terminalsand earthground:

750VACrmsor1000V DC

-FuseProtection: mA:F200mA/250V ∅5×20,

10A: unfused.

-Display: LCD, 1999counts, updates2-3/sec.

-OverRangeindication: LCD will display"1".

-Lowbatteryindication:

The" "isdisplayed ontheLCD.

-Polarityindication: "−"displayed automatically.

-Powersource: 4.5V

-Batterytype:AAA1.5V

-Dimensions: 158(L)×74(W)×31(H) mm.

-Weight: 220g.Approx. (batteryincluded).

3.2Measurementspecifications

Accuracy: ±(%ofreading+numberofdigits)at 18°Cto

28°C(64°Fto82°F)withrelativehumidityto80%.

-6-

(Accuracyisspecifiedforaperiodoneyearafter

calibration)

3.2.1DC VOLTAGE Accuracy

Range

Resolution

MS8221A/8221D

MS8221B/8230B

0.2V 0.1mV ±0.5%±2

2V 1mV ±0.5%±3

20V 0.01V

200V

0.1V

±0.5%±1

±0.8%±3

1000V

1V ±0.8%±2 ±0.8%±5

-Input impedance:MS8221A/MS8221D: 10MΩ

MS8221B/MS8230B: 1MΩ

-Max. input voltage: 200mV range: 250VDCorACrms

2V -1000V ranges: 1000VDC or750V rms

3.2.2ACVOLTAGE Accuracy

Range

Resolution

MS8221A/8221D

MS8221B/8230B

2V 1mV -

20V 10mV -

200V

0.01V ±0.8%±3

750V

1V ±1.2%±3 ±1.2%±5

-Input impedance:MS8221A/MS8221D: 10MΩ

MS8221B/MS8230B: 1MΩ

-Max. input voltage: 200mV range: 250VDCorACrms

2V -1000V ranges: 1000VDC or750V rms

-Frequencyrange:MS8221A/MS8221D: 40Hz-1000Hz

MS8221B/MS8230B: 40Hz-400Hz

-Response:Average, calibrated inrmsofsinewave.

-7-

3.2.3DC CURRENT Accuracy

Range

Resolution

MS8221A/8221D

MS8221B/8230B

200uA

0.1uA

2mA 1uA ±1.0%±2

20mA

10 uA ±0.8%±1

200mA

100uA ±1.2%±1 ±1.5%±2

10A 10mA ±2.0%±5 ±3.0%±2

Overload protection:F250mA/250Vfuse(10Arange

unfused).

Max. Input Current: mAJack: 200mA, 10AJack: 10A

3.2.4ACCurrent(MS8221A/MS8221D)

Range Resolution

Accuracy

2mA 1µA

20mA 10µA ±1.2%±3

200mA 0.1mA ±2.0%±3

10A 10mA ±3.0%±7

Overload protection:F250mA/250Vfuse(10Arange

unfused).

Max. input current: mA: 200mAdcor200mAacrms

10A: 10Acontinuous, 20A15 sec. Max

FrequencyRange: 40Hz-1kHz

Indication:Average(rmsofsinewave)

3.2.5TransistorhFE (ExceptMS8221D)

Display:read approximatehFEvalue(0~1000)of

transistorundertest (ALLTYPE).

Testcondition:basecurrentapprox.10µA(MS8221A)

or2µA(MS8221B/MS8230B).

CE: approx. 2.8V

3.2.6Resistance Accuracy

Range

Resolution

MS8221A/8221D

MS8221B/8230B

200Ω

0.1Ω±0.8%±3 ±1.0%±3

2KΩ1Ω

20KΩ

10Ω

200KΩ

100Ω

2MΩ1kΩ

±0.8%±1 ±1.0%±2

20MΩ

10kΩ±1.0%±2 -

Overload protection: 250V DCor250VACrms.

3.2.7Diodetest

Display: read approximateforwardvoltageofdiode

ForwardDCCurrent: approx. 1mA

Reversed DCVoltage:approx. 2.8V

Overload protection: 250V DC or250VACrms

3.2.8Audiblecontinuitytest

Built-inbuzzersoundsifresistanceisless than

approx. 50Ω.

Opencircuit voltage:approx. 2.8V

Overload protection: 250V DC or250VACrms

3.2.9Temperature(OnlyMS8221B)

Range Resolution Accuracy

-20℃to0℃±5.0%±4

0℃to400℃1℃±1.0%±3

-8-

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