Htc Dm-85t User manual

DM-85TDIGTALMULTIMETEROperationManual

CONTENTS

GENERALDESCRIPTION……………………………

SAFETYPRECAUTIONS………………………………

FEATURES…………………………………………

OPERATIONINSTRUCTION…………………………

MAINTENANCE…………………………

TROUBLESHOOTING…………………………



1.GeneralDescription

Thisisa31/2 digitalmultimeterwithhighstablilityandperformance.ItusesaLCDwith

20mmhighfigure,whichmakesthereadingclearerandtheoperationmoreconvenient.

ItcantestDCV,ACV,DCA,ACA,resistance,capacitance,frequency,NCV,dutycycle,

temperature,diode,andcontinuity.Thismeteralsodesignedwithfunctionsincluding

unitsymboldisplay,datahold,lighting,autorange,autopoweroffandwarning

functions.Toassurehighaccuracyandresolution,itadoptsintegratedcircuit8‐bit

microprocessorandadualintegralA/DconversionasLCDdriver,givinghighresolution

andhighaccuracy.Itisanidealtoolforlabs,factoriesandradio‐technology.



2.SafetyInstructions

TheinstrumentisdesignedincompliancewithIEC1010standard(safetystandardissued

byInternationalElectrotechnicalCommittee).Pleasereadthefollowingsafety

instructionsbeforeoperation.



2.1Checktheconnectionandinsulationoftestleadstoavoidelectricshock.

2.2Toavoidelectricshockanddamagetothemeter,donotinputvoltageexceeding

ratedvalue.

2.3WhenmeasuringvoltagehigherthanDC60VorAC40V,pleasebecarefulandavoid

electricshock.

2.4Selectcorrectfunctionandrangetoavoidwrongoperation.

2.5Movethetestleadsawayfromtestpointswhenswitchingtootherfunction.

2.6Don’tinputvoltageincurrentterminal.

2.7Don’tmakeanymodificationtothecircuit.Itmaydamagethemeterorjeopardize

safety.

2.8Safetysymbols:

“”Highvoltage,“ ”GND,“ ”Dualinsulation,“ ”Refertomanual,“ ”Low

batteryindication.



3.Features

3.1GeneralCharacteristics

3.1.1Display:LCD;

3.1.2Maxdisplay:6000(35/6digits,automaticpolarity,andunitsymboldisplay);

3.1.3Measurementmethod:Analogtodigitalconverter(inmicroprocessorADC+MCU);

3.1.4Samplingrate:approx.3times/sec.

3.1.5Over‐rangedisplay:“OL”displayed.

3.1.6Lowbatteryindicator:“”

3.1.7Workingenvironment:(0～40) ,relativehumidity:<80%℃;

3.1.8Storecondition:(‐10～50) ,relativehumidity:<80%℃

3.1.9Battery:2pieces1.5Vbattery(“AAA”7#battery);

3.1.10Dimension:140×72×37mm(lengthxwidthxheight);

3.1.11Weight:approx.195g(includingbattery);

3.1.12Accessories:testleads,TP01thermocouple,usermanual,holster,giftbox,and

2*1.5Vbatteries.



3.2TechnicalFeatures

3.2.1Accuracy:±(a%×reading+digits).Toassureaccuracy,theambienttemperature

shouldbe(23±5)℃,relativehumidity<75%.Oneyearaccuracyisguaranteedsince

productiondate.



3.2.2DCVoltage（DCV）

RangeAccuracyResolution

600mV

±(0.5%+4)

0.1mV

6V1mV

60V10mV

600V±(1.0%+4)100mV

Inputimpedance:at200mvrange>40MΩ,atotherrangesis10MΩ.

Overloadprotection:600VDC/ACrms.



3.2.3.ACVoltage（ACV）

RangeAccuracyResolution

6V

±(0.8%+6)

1mV

60V10mV

600V±(1.0%+6)100mV

Inputimpedance:10MΩ.

Overloadprotection:600VDC/ACrms.

Frequencyresponse:at600Vrange:(40~1000)Hz,atotherranges:(40~2000)Hz

Displaying:TrueRMSresponse(calibrationbasedonsinewaveRMS)



3.2.4DCCurrent（DCA）

RangeAccuracyResolution

600uA

±(1.0%+5)

0.1μA

6000uA1μA

60mA10μA

600mA100μA

6A1mA

10A±(2.0%+5)10mA

Maximumvoltagedrop:200mVforfullrange.

Maximuminputcurrent:10A(within10seconds).

Overloadprotection:0.5A/250Vfuseand10A/250Vfuse.



3.2.5ACCurrent(ACA)



RangeAccuracyResolution

600uA

±(1.5%+5)

0.1μA

6000uA1μA

60mA10μA

600mA100μA

6A1mA

10A±(2.0%+10)10mA

Maximumvoltagedrop:200mVforfullrange.

Maximuminputcurrent:10A(within10seconds).

Overloadprotection:0.5A/250Vfuseand10A/250Vfuse.

Frequencyresponse:10Arange:40~100Hz,otherranges:40～400Hz.



3.2.6Resistance（Ω）

RangeAccuracyResolution

600Ω ±(0.8%+5)0.1Ω

6kΩ

±(0.8%+1)

1Ω

60kΩ 10Ω

600kΩ 100Ω

6MΩ 1kΩ

60MΩ ±(1.2%+5)10kΩ

Opencircuitvoltage:500mV

Overloadprotection:250VDC/ACpeakvalue.



3.2.7Capacitance(C)

RangeAccuracyResolution

60nF±(2.5%+6)10pF

600nF

±(2.5%+5)

100pF

6uF1nF

60uF10nF

600uF

±(5.0%+8)

100nF

6mF1uF

60mF10uF

Overloadprotection:250VDC/ACpeakvalue.



3.2.8Frequency

RangeAccuracyResolution

10Hz

±(0.5%+4)

0.01Hz

100Hz0.1Hz

1000Hz1Hz

10kHz10Hz

100kHz100Hz

1MHz1kHz

10MHz10kHz

Inputsensitivity:0.7Vrms.

Overloadprotection:250VDC/ACpeakvalue.



3.2.9DiodeandContinuityTest

MeasurementRangeTestconditions

 Diodeforwardvoltagedrop.

ForwardDCcurrentis

approx0.8mA,

reversevoltageis

approx2.2V.

Whentheresistanceundertest

islessthan50Ω,buzzersounds

continuously.

Opencircuitvoltage:

2.2V

Overloadprotection:250VDC/ACpeakvalue.

WARNING:Donotinputvoltageatthisrange!



3.2.10Temperature(℃/℉)

RangeAccuracyResolution

‐40℃~1000℃＜400 ±(℃1.0%+5)

≥400 ±(1.5%+15)℃1℃

0F~1832℉＜750 ±(℉1.0%+5)

≥750 ±(1.5%+15)℉℉

Thermocouple:Ktype.

WARNING:donotinputvoltageatthisrange!



Operation

4.1PanelDescription

①.LCD:Displaythedataandunitsymbol



NumberFeatureDescription

1 △ Relative (REL) mode is active

2 DataHoldisactive.

3 - Indicatesnegativereadings.

4 DC DCvoltageorcurrentmeasurement.

5 AC ACvoltageorcurrentmeasurement.

6 AUTO Autorangemode.

7 Null

8 Diodetestmode.

9 Thecontinuitybeeperison.

10 MAX MIN Null

11 APO Autopoweroffsymbol.

12 Thesymbolofhighvoltageriskindication.

13 Lowbatteryindication.Warning:Toavoiderror readings,whichcouldleadto

possibleelectricshockorpersonalinjury,pleasereplacethebatteryintime.

hFE

%，，

℃℉

MΩ，kΩ，Ω

Hz，kHz，MHz

mV, V

uA， mA， A

Null;

Dutycycle,DegreesCelsius,DegreesFahrenheit;

Megohm,Kilohm,Ohm;

Hertz,Kilohertz,Megahertz;

Millivolts,Volts;

Microamp,Milliamp,Amperes(A).



②.Rotaryswitch:itisusedtochangetherangeandchoosefunctions.

Switch

positionDescription

ACvoltagemeasurement.PressSELECTkeytoswitchbetweenfrequency/dutycycle

measurements.

DCvoltagemeasurement.

Ω Resistancemeasurement.

Diode/continuitymeasurement.PressSELECTkeytochoosediodeorcontinuityrange.

Capacitancemeasurement.

Hz Frequencymeasurement,PressSELECTkeytoswitchbetweenfrequency/dutycycle

measurements.

℃/℉ Temperaturemeasurement,pressSELECTkeytochoose℃or℉.

NCV Non‐contactvoltagedetector.

DCcurrentmeasurement(from0uAto6000uA).PressSELECTkeytoswitchtoAC

currentmeasurement(from0uAto6000uA).

DCcurrentmeasurement(from0mAto600mA).PressSELECTkeytoswitchtoAC

currentmeasurement(from0mAto600mA).

DCcurrentmeasurement(from0Ato10A).PressSELECTkeytoswitchtoACcurrent

measurement(from0Ato10A).



③InputTerminal

TerminalDescription

AInputterminalforACandDCcurrentfrom0to10.00A(Overloadformax10seconds).

VΩmA

Inputterminalforvoltage,resistance,diode,andcontinuity,andtemperaturepositive

(+)terminal.ACandDCcurrentfrom0uAto600mA(Max18hoursforlessthan

600mA).

COMCommonterminalforallmeasurements,andtemperaturenegative(‐)terminal.



④FunctionKey

SELECT/ Key:

1) Selectfunction:PressSELECTkeytochooseDCorACmeasurementunder

ranges.Under(Diode/Continuity)range,pressSELECTkeycanchoose

(diodetest)or  (continuitytest).Undertemperatureranges,pressSELECTkeyto

chooseDegreesCelsiusorDegreesFahrenheit.UnderACVranges,pressSELECTkey

toswitchbetweenFrequencyorDutyCyclemeasurement.

2) Whenthereisnomeasurementin15minutes,themeterwillautomaticallypower

offandentersleepmode.Oneminutebeforesleepmode,thebuzzerwillbeepfor5

timestoreminduser.Pressanybuttonorturntherotaryswitchwillexitthesleep

mode.

3) PressSELECTkeytoactivethemeterfromthesleepmodeorholdtheSELECTkey

downwhenturnonthemetertocancelautopowerofffunction.

4) TORCHFUNCTIONKey:PressTORCHFUNCTIONkeyformorethan2secondstoturn

onthetorch.Ppressitformorethan2secondsonceagaintoturnoffthetorch.



RANGE/RELKey

1) Autorangeisthedefaultwhenyouturnonthemeter,andthemeterdisplays

“AUTO”symbol.PressRANGEtoentermanualrangemode.PressRANGEtoswitch

betweentherangesavailablefortheselectedfunction.HoldtheRANGEbutton

downformorethan2secondstoreturntoautoranging,

2) Undercapacitancemeasurement,pressRELkeytoenterrelativevaluetestmode.

Thedisplayiszeroed,and△symbolappears.PressRELkeyagaintoexitrelative

valuetestmode.



HOLD/ LightKey

1) HOLDKey:PressHOLDkeytoenterHOLDmode.Thecurrentvaluewillbehold,and

symbol““willbedisplayed.PressHOLDagaintoexittheHOLDmode.

2) LightKey:PressHOLDkeyformorethan2secondstoturnonthebacklight.The

backlightcanlastfor15seconds.During15seconds,press“”lightkeyfor2

secondsagaintoturnoffthebacklight.



⑤Non‐contactvoltagedetectorarea.



AUTOPOWER OFF

⑥Holster,Batterydoor.

Seepicture.



4.2DCVmeasurement

4.2.1Inserttheblacktestleadinto“COM”terminal,andtheredoneinto“VΩmA”

terminal.

4.2.2Turntherotarytoswitchto“”ranges.UnderAutoRangestatus,itwilldisplay

“AUTO”symbol.Press“RANGE/REL”keycanchangetoManualrange,theavailable

rangesare600mV,6V,60V,600V.

4.2.3Connecttestleadstothetestpoint;LCDwilldisplaypolarityandvoltageofthetest

pointconnectedbytheredtestlead.

NOTE:

1) IfLCDdisplay“OL”undermanualrange,itmeansitisoverrange,nowyouneedto

selectahigherrange.

1) Donotinputvoltageover600V.Oritmaycausedamagetothecircuitofthemeter,

andthebuilt‐inbuzzerwillalarm.

2) Becarefulwhilemeasuringahighvoltagecircuit.DONOTtouchthehighvoltage

circuit.



4.3ACVmeasurement

4.3.1Inserttheblacktestleadinto“COM”terminal,andtheredoneinto“VΩmA”

terminal.

4.3.2Turntherotarytoswitchto“”ranges.UnderAutoRangestatus,itwilldisplay

“AUTO”symbol.Press“RANGE/REL”keycanchangetoManualrange,theavailable

rangesare600mV,6V,60V,600V;Press“SELECT”keytoswitchbetween

Frequency/Dutycyclemeasurement.

4.3.3Connecttestleadstothetestpoint;LCDwilldisplayvoltageofthetestpoint

connectedbythetestleads.

NOTE:

2) IfLCDdisplay“OL”undermanualrange,itmeansitisoverrange,nowyouneedto

selectahigherrange.

1) Donotinputavoltageover600V.Oritmaycausedamagetothecircuitofthe

meter,andthebuilt‐inbuzzerwillalarm.

2) Becarefulwhilemeasuringahighvoltagecircuit.DONOTtouchthehighvoltage

circuit.



4.4DCAmeasurement

4.4.1Inserttheblacktestleadinto“COM”terminalandtheredoneinto“VΩmA”

terminal(Max.600mA)orinto“10A”terminal(Max.10A);

4.4.2TurntherotaryswitchtoCurrentranges,autorangeisthedefaultwhenyouturn

onthemeter,“AUTO”symboldisplayed.Press“RANGE/REL”keycanchangetoManual

range,theavailablerangesare600uA,6000uA,60mA,600mA,6A,10A.

4.4.3Connecttestleadstothetestedcircuit;LCDwilldisplaypolarityandcurrentofthe

testpointconnectedbytheredtestlead.

NOTE:

1) Ifyouarenotsureabouttherangeofcurrentundertest,pleaseselectthehighest

range,andthenselecttheproperrangebasedondisplayingvalue.

2) IftheLCDdisplays“OL”,itmeansthecurrentisoverrange.Nowyouneedtoselect

ahigherrange.

3) Maximuminputcurrentis600mAor10A(subjecttowhichterminaltheredtest

leadisinsertedinto).Currentexceedingratedvaluewilldamagethefuse,andmay

causedamagetothecircuitofmeter.



4.5ACAmeasurement

4.5.1Inserttheblacktestleadinto“COM”terminalandtheredoneinto“VΩmA”

terminal(Max.200mA)orinto“10A”terminal(Max.10A);

4.5.2Turntherotaryswitchtoapropercuttentrange.Press“SELECT/ ”keytoselect

theACmode,autorangeisthedefaultwhenyouturnonthemeter,“AUTO”symbol

displayed.Press“RANGE/REL”keycanchangetoManualrange,theavailablerangesare

600uA,6000uA,60mA,600mA,6A,10A.

4.5.3Connecttestleadstothetestedcircuit;LCDwilldisplaythecurrentofthetest

point.



NOTE:

1) Ifyouarenotsureabouttherangeofcurrentundertest,pleaseselectthehighest

range,andthenselecttheproperrangebasedondisplayingvalue.

2) IftheLCDdisplays“OL”,itmeansthecurrentisoverrange.Nowyouneedtoselect

ahigherrange.

3) Maximuminputcurrentis600mAor10A(whichterminaltheredtestleadis

insertedinto).Currentexceedingratedvaluewilldamagethefuse,andmaycause

damagetothecircuitofmeter.



4.6RESISTANCEmeasurement

4.6.1Inserttheblacktestleadinto“COM”terminalandtheredoneinto“VΩmA”

terminal;

4.6.2Turntherotaryswitchto“Ω”ranges,press“SELECT/ ”keytoselect“Ω”

mode.Connecttwotestleadsacrosstheresistorundertest;

4.6.3Autorangeisthedefaultwhenyouturnonthemeter,“AUTO”symboldisplayed.

Press“RANGE/REL”keycanchangetoManualrange,theavailablerangesare600Ω,6k

Ω,60kΩ,600kΩ,6MΩ,60MΩ.

NOTE:

1) Ifyouarenotsureabouttherangeofcurrentundertest,pleaseselectthehighest

range;

2) IfLCDdisplays“OL”,itmeansitisoverrange.Nowyouneedtoselectahigherrange.

Whenmeasuringvalueisover1MΩ,thereadingwilltakeafewsecondstobestable.

It’snormalforhighresistancemeasurement;

3) Wheninputterminalisinopencircuit,LCDwilldisplay“OL”;

4) Beforemeasuringinlineresistor,makesurethatthepowerisoffandallcapacitors

aredischargedcompletely;

5) Whenthereisbigerror,itmaybeaffectedbyotheronlinecomponentorthereis

voltageontheresistor;

6) Donotinputanyvoltageatresistancerange.



4.7CAPACITANCEMEASUREMENT

4.7.1Inserttheblacklestleadin“COM”terminalandtheredonein“VΩmA”terminal;

4.7.2Turntherotarytoswitchto“ ”range;

4.7.3IftheLCDdoesn’tdisplay“0”,press“RANGE/REL”toclearthereading;

4.7.4Connectthecapacitorto“COM”and“VΩmA”terminal.(Note:theredtestleadsis

forpositivepole+).LCDdisplayscapacitancevalue.

NOTE:

1) Don’tinputvoltageorcurrentundercapacitanceranges;

2) Press“RANGE/REL”toclearthereadingbeforetestingtoassuretheaccuracy;

3) Thereisonlytheautorangemodeunderthecapacitancerange;

4) Thecapacitormustbecompletelydischargedbeforetestingtoavoiddamagethe

meter,;

5) Thereadingofahigherthan600uFrangewilltakemoreseveralsecondstobe

stabled.



4.8FREQUENCYMEASUREMENT

4.8.1Insertthelestleadsorshieldedcableinto“COM”terminaland“VΩmA”terminal;

4.8.2Turntherotarytoswitchto“Hz”range,connectthetestleadsorshieldedcableto

thesignalsourceortheloadwhichistested(Itshouldover3Hz).

4.8.3Press“SELECT/ ”keytochoosefrequency/dutycyclemeasurement,LCDwill

displaythefrequencyordutycycleofthetestedsignalsource.

NOTE:

1) Thereisonlytheautorangemodeunderthefrequencyrange;

2) Whentheinputishigherthan10VACrms,pleaseswitchtorangeandthen

selectfrequencyordutycycletomeasure;

3) Innoisyenvironment,it'sbettertouseshieldcabletomeasurealowsignal;

4) Donottouchthehighvoltagecircuitwhenmeasuringhighvoltagecircuit;

5) Don’tinputvoltagehigherthan250VDC/ACpeakvalueunderHzranges,oritmay

damagethemeter.



4.9NON‐CONTACTVOLTAGE(NCV)DETECT

WARNING:

Thisfunctioncouldbeaffectedbydifferentexternalinterferencesources,andthenthe

alarmisactivatedbywrongsignal.Themeasurementresultisforreferenceonly.



Turntherotaryfunctionswitchto“NCV”position.Whenthetestingcircuitisplaced

abovethemeter,themeterdisplaysthestrengthofsignal,andthebuzzeralarmswith

“beepbeep”.

NOTE:

1) Evenifthereisnovoltageindication,theremaybevoltageonthecircuit.Donot

relyonNCVdetectorastheonlywaytodetectvoltage.

2) Voltagedetectingmaybeaffectedbypowersocketdesign,typeofinsulationandits

thicknessandotherfactors.

3) Interferencesourcesintheexternalenvironment,suchasflashinglight,motor,

wouldcausewrongsignaltoactivatealarmfunction.



4.10DIODEANDCONTINUITYTEST

4.10.1Inserttheblacktestleadinto“COM”terminalandtheredoneinto“VΩmA”

terminal(thepolarityofredleadis“+”);

4.10.2Turntherotaryswitchto“Ω”range,andpress“SELECT/ ”keytochoose

“”mode;

4.10.3Forwardmeasurement:connectredtestleadtothepositivepolarityandthe

blacktestleadtothenegativepolarityofthediode.LCDwilldisplaytheapprox.valueof

forwardvoltagedrop;

4.10.4Backwardmeasurement:connectredtestleadtothenegativepolarityandthe

blacktestleadtopositivepolarityofthediode.LCDwilldisplay“OL”;

4.10.5Thecompletediodetestincludesforwardandbackwardmeasurement,ifthe

resultdoesn’tmeetthedescriptionsabove;itmeansthediodeisbroken;

4.10.6Press“SELECT/ ”keytoselectthecontinyitymeasurementmode;

4.10.7Connecttestleadstotwopointsoftestedcircuit,iftheresistanceislessthan50

Ω,thebuilt‐inbuzzersounds.

NOTE:

1) DONOTinputvoltageat“Ω”range.

2) Whentestcircuits,makesurethepowerisoffandallcapacitorsaredischarged.Any

negativepotentialorACsignalwillactivatethebuzzer.



4.11TEMPERATUREMEASUREMENT

4.11.1Turntherotaryswitchto“℃/℉”range.Press“SELECT/ ”keytoselect℃or

℉mode.

4.11.2Insertthecoldend(freeend)ofthermocouplein“VΩmA(+)”and“COM(‐)”

terminal,andputtheworkingend(temperaturemeasuringend)ofthermocoupleonthe

surfaceorinsidethetestedobject.ThenLCDwilldisplaythetemperatureoftested

object,andthereadingisin℃/℉(whenthepolarityiscontrary.Thereadingwill

decreasewhenthetemperatureofthetestedobjectincrease).

NOTE:

1) Whentheinputterminalisopencircuit,itwilldisplaytheenvironment

temperature.

2) Toensuremeasureaccuracy,donotreplacethetemperatureprobeunlessitis

necessary.

3) Donotinputvoltageattemperaturerange.



5.MAINTENANCE

Thismeterisapreciseinstrument.Anymodificationtothecircuitisnotallowed.

NOTE:

1) Don’tinputthevoltagevaluehigherthan600VDCorACrms.

2) Don’tinputvoltageatcurrent,resistance,diodeorcontinuityrange.

3) Don’tmakeanymeasurementswhenthebatteryisnotproperlyinstalledorthe

backcoverisn’tfixed.

4) Beforereplacingbatteryorfuse,pleaseremovethetestleadsfromthemeasuring

pointandturnoffthepower.

5) Keepthemeterawayfromwater,dustandshock.

6) Don'texposethemeterunderhightemperature,highhumidity,combustible,

explosiveandstrongmagneticplace.

7) Wipethecasewithadampclothanddetergent.Donotuseabrasivesandalcoholto

cleanthemeter.

8) Ifthemeterwillnotbeusedforalongtime,pleasetakeoutthebatterytoavoid

leakagedamage.

9) When“ ”symbolisdisplayed,pleasereplacethebatteryaccordingtothe

followingsteps:

①Removetheholsteratfirst.

②Screwoffthefixingscrewsofthebatterydoorandremovethecover;

③Takeofftheoldbatteryandreplacewithanewone.Toextendtheusinglife,

it'sbettertousealkalinebattery.

④Fixthebatterydoor.

⑤Putontheholster.

10) Fusereplacement:Whenreplacingfuse,pleaseusefusewithsametypeand

specification.

①Removetheholsterfirst,thenscrewoffthefixingscrewsofthebatterydoor

andbackcovertoremovethecover;

②Takeofftheoldfuseandreplacewithanewone.

③Installthebackcover,thenfixthescrewsofthebatterydoorandbackcover.

Putontheholster.



6.TroubleShooting

Ifthemeterdoesnotworkproperly,pleasecheckthemeterasfollowingsteps:

(Iftheproblemsstillcannotbesolved,pleaserefertorepairingcenterorcontactthe

localdealers.)



FatultSolution

NoreadingonLCD

Turnonthepower;

ReleasetheHOLDkey;

Replacebattery.

signalappearsReplacebattery.

NoinputReplacefuse.

BigerrorValueReplacebattery.



● Thespecificationsaresubjecttochangeswithoutpriornotice;

● Thecontentofthismanualisregardedascorrect.Ifusersfindoutanymistakesor

omissions,pleasekindlycontactthemanufacturer;

● Themanufacturerwillnotberesponsibleforaccidentsanddamagecausedby

improperoperations;

● ThefunctionsdescribedinthisUserManualshallnotbeconsideredasthereason

foranyspecialusages;



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