Tenma 72-7780 Bedienungsanleitung

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TrueRMSDigitalMultimeter

Model:72‐7780

UserManual

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I. Overview

72‐2800isaprofessionalhandheldtrueRMSmultimeterwithwidescopeof

application.Itisasafe,stableandreliablemeasurementdeviceforAC/DC,resistance,

diode,continuity,capacitance,frequency,NCVmeasurementetc.

II. UnpackingInspection

Openthepackageboxandtakeoutthedevice.Pleasecheckwhetherthefollowing

itemsaredeficientordamagedandcontactyoursupplierimmediatelyiftheyare.

•Usermanual‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐1pc

•Testleads‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐1pair

•K‐typethermocouple‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐1pc

•Optionalcurrentclamp

III. Safetyinformation

SafetyStandards

•EN61010‐1:2010

•CATIII600V,doubleinsulationstandard,overvoltagestandard,andRoHS,

pollutiongradeII

Pleasereadandcomplywiththesafetyinformationcarefully,ortheprotection

providedbythedevicemaybeimpaired.

1. Donotusethedeviceiftherearcoverisnotcovereduporitwillposeashock

hazard

2. Donotusethedeviceifthedeviceortestleadsappeardamagedorifyou

suspectthatthedeviceisnotoperatingproperly.Payparticularattentiontothe

insulationlayers.

3. Toavoidfalsereading,replacethebatterywhenthebatteryindicator

appears.

4. Functionaldialshouldbeswitchedtoproperposition.

5. Neverinputvoltageandcurrentexceedingthevaluelistedonthedevice.

6. Donotswitchthefunctionaldialduringmeasuring.

7. Aftereachmeasure,disconnectthetestleadswiththecircuit.Formeasuring

current,switchoffthepowersupplybeforetestleadsdisconnection,especially

importantformeasuringlargecurrent.

8. Usecautiontomeasurevoltage>DC60VorAC30Vrms.

9. Donotuseorstorethedeviceinhightemperature,highhumidity,flammable,

explosiveorstrongmagneticfieldenvironments.

10. Donotchangetheinternalcircuitofthedeviceinordertoavoidthedamageto

thedeviceandusers.

11. Usedampclothtocleanthecase;donotusedetergentcontainingsolventsor

abradants.

IV. Symbols

Lowbattery

Buzzerindicator

Diode

AC/DC

Warning

Grounding

Currentclamp

Doubleinsulation

ComplywithEuropeanUnionDirectives

V. Generalspecifications

1) Maxvoltagebetweeninputterminalsandearthgrounding:SeeTechnical

Specifications

2) FuseType:

10AJack:F10AH600VFuse(Φ6x25)mm

mA/μAJack:F600mAH600VFuse(Φ6x32)mm

3) MaxDisplayValue:

Capacitancemeasurement:9999

Frequencymeasurement:9999

Othermeasurement:6000

DutyRatio：1~99.9%

Diode:3.2V

Others:

1) Range:Auto/Manual

2) Polarity:Auto

3) Displayupdates2~3timesforeverysecond.OverrangeIndicator:“OL”

4) Operatingtemperature:0˚C~40˚C(32˚F~104˚F)

Storagetemperature:‐10˚C~50˚C(14˚F~122˚F)

Relativehumidity:≤75%at0˚C~30˚C;≤50%at30˚C~40˚C

5) Operatingaltitude:0~2000m

6) Batterytype:AAR6P1.5V×2

7) Lowpowerindicator:

8) Dimension:175mm×80mm×48.5mm

9) Weight:350g(batteriesincluded)

10) Electromagneticcompatibility:

RF≤1V/m,overallaccuracy=specifiedaccuracy+5%ofrange.

RF>1V/m,nospecifiedcalculation.

VI. Structure(seefigure1)

1/Protectivecase

2/Displayscreen

3/4/7Functionalbuttons

5/Functionaldial

6/Inputjacks

VII. Display



SymbolIndication

Datahold

━Negativevalue

AC/DCACorDCmeasurement

MAX/MINMaximumorminimumreading

Lowpower

AutoRangeAutorangeselection

Diodemeasurement

Continuitymeasurement

Relativemeasurement

Ω、kΩ、MΩ Unitofresistance

Hz、kHz、MHzUnitoffrequency

%Unitofdutyratio

mV、VUnitofvoltage

μA、mA、AUnitofcurrent

nF、μF、mFUnitofcapacitance

CCelsiusdegree

FFahrenheitdegree

NCVNon‐contactvoltage

Autoshutdown

Currentclamp

VIII. Functionaldialandbuttons

PositionNote

V、V、mVAC/DCvoltage

Ω Resistance

Diode

Continuity

Capacitance

HzFrequency

%Dutyratio

˚C/˚FTemperature

μAmA AAC/DCcurrent

60A AC/DCcurrentclamp

NCVNon‐contactvoltage

OFFshutdown

Buttons：

RANGE：Switchtherangemodetoauto/manualandthencyclethroughallranges.To

exitauto/manualmode,pressthebuttonfor2secondsorswitchthefunctionaldial.

(OnlyforV,Ω,I measurement)

MAX/MIN：StartsandstopsMax/Minrecording.Toexitthismode,pressthebutton

for2secondsorswitchthefunctionaldial.(OnlyforV,Ω,I and˚C/˚F

measurement)

REL：Savethefirstreadingasreferencevalue.Thesecondreading=second

measurementvalue‐referencevalue.Toexithismode,pressthebuttonfor2seconds.

(OnlyforV,Ω,I and˚C/˚Fandmeasurement);whenmeasuringcapacitance,

RELbuttonisonlyusedforeliminatingintrinsicvalue.

Hz/%：WhenmeasuringACvoltage/current,pressthebuttontocyclethrough

frequencyanddutyratiomeasurement.

SELECT：Selectfunctions.UnderACmodes,longpressthebuttonuntilUFCappears

toenterVFCmeasurementmodeandmeasurethevariablefrequencyvoltage.Long

pressgaintoexitVFCmeasurementmode.

HOLD：Pressthebuttononcetoholdthereading.Pressagaintounlockthereading

andentergeneralmeasurementmodes.

IX. Operationinstructions

Toavoidfalsereading,replacethebatteryifthebatterylowpowersymbol

appears.Alsopayspecialattentiontothewarningsignbesidesthetestlead

housing,indicatingthatthetestedvoltageorcurrentmustnotexceedthevalues

listedonthedevice.

1.AC/DCvoltagemeasurement(seeFigure3)

1) Connecttestleadswiththeloadinparallel.

2) Wheninputimpedanceabout10MΩ,thereis

measurementerrors.Inputimpedance≤10kΩ,

measurementerrorscanbeignored(≤0.1%)

Notes:

•Donotmeasurevoltageover600Vrms,oritmayexpose

userstoelectricshockanddamagethedevice.

•Pleasepayextraattentionwhenmeasuringhighvoltagein

ordertoavoidelectricshock.

2.Resistancemeasurement(seefigure4a)

Connecttestleadswiththeresistanceinparallel.

Warnings:

•Iftheresistorisopenorovertherange,the“OL”symbol

willbedisplayedonthescreen.

•Beforemeasuringresistance,switchoffthepowersupply

ofthecircuit,andfullydischargeallcapacitors.

•Whenmeasuringlowresistance,thetestleadswillproduce

0.1Ω~0.2Ωmeasurementerror.Toobtainaccurate

measurement,shortthetestleadsanduseRELfunction.

•Iftheresistancewhenshortedismorethan0.5Ω,pleasecheckiftestleadsare

loosenedordamaged.

•Whenmeasuringhighresistanceabove60MΩ,itisnormaltotakeafewseconds

tosteadythereadings.

•Resistancemeasurementcanbeusedtoinspectdevice’sinternalfuses.(see

figure4b)

•DonotinputvoltageoverDC60VorAC30V.

3.Continuitymeasurement(seefigure5)

Iftheresistancebeingmeasuredisover150Ω,circuitisinopen

status,buzzerdoesnotgooff.Iftheresistancelessthan10Ω,

circuitisingoodconductionstatus,buzzerwillcontinuouslygooff.

Note:

•Toavoiddamagetothedevice,beforemeasuringcontinuity,

switchoffallpowersuppliesandfullydischargeallcapacitors.

•DonotinputvoltageoverDC60VorAC30V.

4.Diodemeasurement(seefigure6)

“OL”symbolappearswhenthediodeisopenorpolarityis

reversed.

ForsiliconPNjunction,normalvalue:500~800mV(0.5~0.8V).

Notes:

•Switchoffthepowersupplytothecircuit,andfullydischarge

allcapacitors

•Voltagefortestingdiodeisabout3.1V.

•DonotinputvoltageoverDC60VorAC30V.



5.Capacitancemeasurement(seefigure7)

Whenthereisnoinput,thedevicedisplaysafixedvalue

(intrinsiccapacitance).Forsmallcapacitance

measurement,toensuremeasurementaccuracy,the

measuredvaluemustbesubtractedfromintrinsic

capacitance.Oruserscanmeasuresmallcapacity

capacitorswithrelativemeasurementfunction(REL)(the

devicewillautomaticallysubtracttheintrinsic

capacitance)

Notes:

•Ifthetestedcapacitorisshortedoritscapacityis

overthespecifiedrange“OL”symbolwillbe

displayedonthescreen.

•Whenmeasuringlargecapacitors,itmaytakeafew

secondstoobtainsteadyreadings.

•Beforemeasuringcapacitors(especiallyforhigh

voltagecapacitors),pleasefullydischargethem.

6.Frequency/Dutyratiomeasurement(seefigure8)

Atthefrequencyposition,presstheHz/%toselect

frequency/dutyratiomeasurementmode.

Notes:

•DonotinputvoltageoverDC60VorAC30V.

7.Temperaturemeasurement(seefigure9)

Turnonthedevice,after“OL”symbolappears,insert

K‐thermocoupleintothedevice.

Note:

OnlyK‐typethermocoupleisapplicable.Themeasured

temperatureshouldbelessthan230˚C/446˚F

(˚F=˚C*1.8+32)



8.AC/DCcurrentmeasurement(seefigure10)

Connecttestleadswiththetestedcircuitinseries.

ReadingsunderthisACmeasurementistrueRMS.

Notes:

•Beforemeasuring,switchoffthepowersupplyof

thecircuit.

•Iftherangeofthemeasuredcurrentisunknown,

selectthemaximumrangeandthenaccordingly

reduce.

•Therearefusesinside10AjackandmA/μAjack.Do

notconnectthetestleadswithanycircuitsin

parallel.

•Ifthetestedcurrentisover5A,eachmeasurement

timeshouldbelessthan10secondsandthenext

testshouldbeafter15minutes.

•WhenmeasuringACcurrent,pressHz/%buttonto

displayACfrequencyordutyratio.

•60AACandDCcurrentclampmeasurement(see

figure11)

Connectasshownwiththeattachedcurrentclamp.

9.NCVmeasurement(seefigure12)

1）SwitchthedialtoNCVposition

2）Placethedevicenearthemeasuredobject.

“‐“symbolindicatestheintensityoftheelectric

field.More“‐“andthehigherthebuzzerfrequency,

thehighertheelectricfieldintensity.

3）Intensityofelectricfield

*"EF":0~50mV

*"‐":50~100mV

*"‐‐":100~150mV

*"‐‐‐":150~200mV

*"‐‐‐‐":>200mV

.Notes:

TestleadsarenotrequiredforNCVmeasurement.



10.Others

•Thedeviceentersmeasurementstatusin2secondsafterstartup.Restartthe

device,”ErrE”appears.

•Thedeviceautomaticallyshutsdownifthereisnooperationfor15minutes.

Youcanwakeupthedevicebypressinganykey.Todisableautoshutdown,

switchthedialtoOFFposition,longpressSELETEbuttonandturnonthedevice.

symbolwilldisappearwithonelongbeep.Recovertheauto‐offfunctionby

restartingthedevice.

•Buzzernotification

1)Inputvoltage≥600V(AC/DC),buzzerwillcontinuouslybeepindicatingmeasure

rangeisatlimit

2)Inputcurrent>10A(AC/DC),buzzerwillcontinuouslybeepindicatingmeasure

rangeisatlimit

•Lowpowerwarnings:Voltageofthebattery<2.4V,symbolappears,the

devicecanstillbeused.Ifvoltageislowerthan2.2V,thedevicecannotworkand

thesymboldisappearsafterstartup.

•Thescreenbacklightcannotworkifbatteryvoltagelessthan2.6V.

X. Technicalspecification

Accuracy:±(%ofreading+numericalvalueinleastsignificantdigitslot),1Year

Warranty

Ambienttemperature:23˚C±5˚C(73.4˚F±9˚F)

Ambienthumidity:≤75%RH

1.DCvoltage

RangeResoluti

onAccuracy

60.00mV*0.01mV±(0.5%+2)

600.0mV**0.1mV

6.000V0.001V

±(0.7%+3)

60.00V0.01V

600.0V0.1V

600V1V

Inputimpedance:about10MΩ.

ResultsmightbeunstableatmVrangewhennoloadisconnected.Thevalue

becomesstableoncetheloadisconnected.Leastsignificantdigit≤±3

Maxinputvoltage:±600V,whenthevoltage≥600V,"OL”symbolappearsandthe

buzzergoesoff.”



2.ACvoltage

RangeResolutionAccuracy

60.00mV0.01mV±(1.0%+3)

600.0mV0.1mV

6.000V0.001V

±(0.8%+3)

60.00V0.01V

600.0V0.1V

600V1V±(1.0%+3)

VFC200.0V~600V0.1/1V±(4.0%+3)

Inputimpedance:about10MΩ

DisplaytrueRMS.Frequencyresponse:45Hz~1KHz(LPF45~400Hz)

Accuracyguaranteerange:5‐100%oftherange,shortedcircuitallowsleast

significantdigit≤10 

CrestfactoratMaxrange=3.0(excluding600Vrange,crestfactor=1.5)

Maxinputvoltage:600Vrms

3.Resistancemeasurement.

RangeResolutionAccuracy

600.0Ω 0.1Ω ±(1.0%+2)

6.000kΩ 0.001kΩ

±(0.8%+2)60.00kΩ 0.01kΩ

600.0kΩ 0.1kΩ

6.000MΩ 0.001MΩ ±(1.2%+3)

60.00MΩ 0.01MΩ ±(1.5%+5)

Measurementresult=readingofresistor–readingofshortedtestleads

Opencircuitvoltage=1V(Current=0.4mA)

Overloadprotection:600V‐PTC

4.Continuity,Diode

PositionResolutionRemark

0.1Ω

SetValue:

Opencircuit:resistance≥150Ω,nobeep.

Well‐connectedcircuit:resistance≤10Ω,continuous

beeps.

0.001VOpencircuitvoltage:3.2V

SiliconPNjunctionvoltage:0.5~0.8V.

Overloadprotection:600V‐PTC

5.Capacitance

RangeResolutionAccuracy

9.999nF0.001nFRELmode：±(4%+10)

99.99nF~999.9μF0.01nF~0.1μF±(4%+5)

9.999mF~99.99mF0.001mF~0.01mF±10%

Overloadprotection:600V‐PTC

Testcapacitance≤100nF,adaptRELmode.

6.Frequency/Dutyratio

Range ResolutionAccuracy

9.999Hz~9.999MHz0.001Hz~0.001MHz±(0.1%+4)

0.1%~99.9%0.1%Onlyforreference

Overloadprotection:600V‐PTC

Inputrange:(DClevel=0)

≤100kHz:100mVrms≤a≤20Vrms

>100kHz~1MHz:200mVrms≤a≤20Vrms

>1MHz:500mVrms≤a≤20Vrms

>5MHz~10MHz:1Vrms≤a≤20Vrms

Dutyratio%：Onlyforfrequencymeasurement≤100kHz

Notes：WhenmeasuringACvoltageorcurrent,followingconditionsshouldbe

satisfied:

Frequencyresponse≤1kHz

ACvoltage:mVposition≥100mV;Vposition≥Range×6%

ACcurrent:inputrange:4000/6000μA,400/600mA,10A:A≥range×6%

400/600μA,40/60mA,4/6A:A≥range×60%

7.Temperature

RangeResolutionAccuracy

˚C˚‐40~1000˚C

‐40~0˚C

1˚C

±3

>0~100˚C±(1.0%+3)

>100~1000˚C±(2.0%+3)

˚F‐40~1832˚F

‐40~32˚F

1˚F

±5

>32~212˚F±(1.5%+5)

>212~1832˚F±(2.5%+5)

Overloadprotection:600V‐PTC

•K‐typethermocoupleisonlyapplicablefortemperaturelessthan250˚C/482˚F.

8.DCcurrent

RangeResolution Accuracy

μA600.0μA0.1μA

±(0.7%+2)

6000μA1μA

mA60.00mA0.01mA

600.0mA0.1mA

A6.000A0.001A±(1.0%+3)

10.00A0.01A

•Overloadprotection:

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