Mastech MS8221 User manual

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
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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
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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
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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
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4. hFE socket (exceptMS8221D)
5.Terminals
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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%.
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(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.
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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).
V
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
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