The HTC 5020C Dual Trace Oscilloscope is a versatile and easy-to-use instrument designed for a wide range of applications in electronics, telecommunications, and education. With its 20MHz bandwidth, 5mV/DIV sensitivity, and dual-channel operation, the HTC 5020C allows users to observe and analyze complex waveforms with precision and clarity. It features a bright and sharp 6-inch rectangular CRT display with an internal graticule for accurate measurements, and a comprehensive set of controls for adjusting sweep time, triggering, and vertical sensitivity.
The HTC 5020C Dual Trace Oscilloscope is a versatile and easy-to-use instrument designed for a wide range of applications in electronics, telecommunications, and education. With its 20MHz bandwidth, 5mV/DIV sensitivity, and dual-channel operation, the HTC 5020C allows users to observe and analyze complex waveforms with precision and clarity. It features a bright and sharp 6-inch rectangular CRT display with an internal graticule for accurate measurements, and a comprehensive set of controls for adjusting sweep time, triggering, and vertical sensitivity.
USERMANUAL
DualTraceOscilloscope
CONTENTS PAGE
1.GENERAL1
1.1Description1
1.2Features1
2.TECHNICALSPECIFICATIONS2
3.PRECAUTIONSBEFOREOPERATINGTHEOSCILLOSCOPE5
3.lUnpackingtheOscilloscope5
32CheckingtheLinevoltage5
3.3Environment6
3.4EquipmentInstallation,andOperation6
3.5CRTIntensity6
3.6WithstandingVoltagesofInputTerminals6
4.OPERATIONMETHOD10
4.1IntroductionofFrontPanel10
4.214
4.3BasicOperation-SinglechannelOperation15
4.4Dual-ChannelOperation16
4.5ADDOperation17
4.6Triggering17
4.7TIME/DIVcontrol20
4.8SweepMagnification20
4.9X-YOperation21
4.10CalibrationofProbe22
4.11DCBALAdjustments22
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.
IntroductionofRearPanel
5.MAINTENANCE
.
.
.BLOCKDIAGRAM
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23
5.1Fusereplacement23
5.2Cleaning23
6-924
1025
1126
COMPONENTTESTOPERATION
WAVEFORMCHART
I
SAFETYTERMSANDSYMBOLS
Thesetermsmayappearinthismanualorontheproduct:
.
WARNING.Warningstatementsidentifyconditionorpracticesthat
couldresultininjuryorlossoflife
Cautionstatementsienifyconditionsorpracticesthat
couldresultindamagetothisproductorotherproperty.
Thefollowingsymbolsmayappearinthismanualorontheproduct:
.dtCAUTION
DANGERATTENTIONProtectiveEarth(ground)
HighVoltagerefertoManualConductorTerminal
Terminal
!
!
!
II
1
1.GENERAL
1.1Description
The20MHz/340oscilloscopearedual-channeloscilloscopewithmaximumsensitivity
of5mV/DIV.Thetimebase
25MHz/0MHz/MHz/50MHzfamily
providesamaximumsweeptimeof0.2uS/DIV.Whenmagnifiedby10,thesweepspeedis
20nS/DIV.Eachoftheseoscilloscopeemploysa6-inchrectangulartypecathode-raytubewithredinternalgraticule.
Theseoscilloscopesaresturdy,easytooperateandexhibitshighoperationalreliability.
1.2Features
1)HighintensityCRTwithhighaccelerationvoltage:
TheCRTisahighbeamtransmission,highintensitytypewithahighaccelerationvoltageof2KVfor20MHz/25MHz
/30MHzand12KVfor40MHz/50MHz.Itdisplaysclearreadabletracesevenathighsweepspeeds.
2)Atriggerlevellockfunctionwhichmakesthetriggeringadjustmentunnecessary.
3)Alternatetriggering:
Evenanobservationoftwowaveformsofdifferentfrequencies,thewaveformoftheeachchannelisstablytriggered.
4)TVsynctriggering:
TheoscilloscopehasasyncseparatorcircuitfortriggeringofTV-VandTV-Hsignals.
5)X-Yoperation:
SettheswitchtoX-Y.ThentheinstrumentworksasanX-Yoscilloscope.CHlcanbeappliedashorizontaldeflection
(X-axis)whileCH2provideverticaldeflection(Y-axis).
2.TECHNICALSPECIFICATIONS
5mV~5V/DIV,10stepsin1-2-5sequence
Tol/2.5orlessofpanel-indicatedvalue.
DC~30MHzDC~40MHzDC~50MHzDC~20MHz
ACcoupling:Lowlimitfrequency10Hz.(Withreferenceto100KHz,8DIV.Frequencyresponsewith-3dB.)
Approx.17.5nSApprox.11.7nSApprox.8.75nSApprox.7nS
Approx.lMohm//Approx.25pF
≤± o0.lDIVofamplitudechangewhenwavefrmof2DIVatgraticulecenterismovedvertically.
CH1:CHlsinglechannel.
CH2:CH2singlechannel.
DUAL:CH1andCH2aredisplayed.ALTorCHOPselectableatanysweeprate.
ADD:CH1+CH2algebraicaddition.
Approx.250KHz
AC,GND,DC
400V(DC+ACpeak),AC:frequencylKHzorlower.
Whensetprobeswitchatl:1,themaximumeffectivereadoutis40Vpp(14Vrmsatsinewave),
orsetprobeswitchat10:1,themaximumeffectivereadoutis400Vpp(140Vrmsatsinewave).
50:1orbetterat50KHzsinusoidalwave.(WhensensitivitiesofCH1andCH2.aresetequally)
>1000:lat50KHz
>30:lat15MHz>30:1at35MHz>30:1at45MHz
Balancedpointvariation:1DIV(Referenceatcentergraticule.)≤
Sensitivity
VernierVerticalsensitivity
Frequencybandwidth
Risetime
Inputimpedance
Linearity
Verticalmodes
Choppingrepetitionfrequency
Inputcoupling
Maximuminputvoltage
Commonmoderejectionratio
Isolationbetweenchannels
(At5mV/DIVrange)
CH2INVBAL.
MODEL
SPECIFICATIONS
DCbalanceshift Adjustableonpanel
2
20MHzOSCILLOSCOPE 30MHzOSCILLOSCOPE40MHzOSCILLOSCOPE50MHzOSCILLOSCOPE
>30:1at25MHz
CH1,CH2,LINE,EXT(CHwhentheverticalmodeisDUALorADD)1andCH2canbeselectedonly
InALTmode,iftheTRIG.ALTswitchispushedin,itcanbeuseforalternatetriggeringoftwodifferentsource.
AC:20Hztofullbandwidth
+/-
20Hz~2MHz:0.5DIV,TRIG-ALT:2DIV,EXT:200mV
TRIG-ALT:3DIV,EXT:800mV
TV:Syncpulsemorethan1div(EXT:lV)
AUTO:Sweepsruninthefreemodewhennotriggeringinputsignalisapplied.
(Applicableforrepetitivesignalsoffrequency25Hzorover.)
NORM:Whennotriggeringsignalisapplied,thetraceisinthereadystateandnotdisplayed.
TV-V:Thissettingisusedwhenobservingtheentireverticalpictureoftelevisionsignal.
TV-H:Thissettingisusedwhenobservingtheentirehorizontalpictureoftelevisionsignal.
(BothTV-VandTV-Hsynchronizeonlywhenthesynchronizingsignalisnegative)
Approx.:lMohm//approx.25pF
400V(DC+ACpeak),AC:FrequencynothigherthanlKHz
0.2uSec~0.5Sec/DIV,20stepsin1-2-5sequence
+/-3%（10°°）C-35C
≤1/2.5ofpanel-indicatedvalue
10times
+/-5%(20nSec~50nSecareuncalibrated)
+/-5%,xl0MAG:+/-10%(0.2sand1s)
Within2DIV.atCRTscreencenter
Sameasverticalaxis.(X-axis:CHlinputsignal;Y-axis:CH2inputsignal.)
DCtoatleast500KzH
≤3atDC~50KHz
Triggeringsource
Coupling
Slope
Sensitivity.
Triggeringmodes
EXTtriggeringsignalinput
Inputimpedance
Max.Inputvoltage
Sweeptime
Sweeptimeaccuracy
Verniersweeptimecontrol
Sweepmagnification
x10MAGsweeptimeaccuracy
Linearity
Positionshiftcausedbyxl0MAG
Sensitivity
Frequencybandwidth
X-Yphasedifference
X-Y
MODE
MODEL
SPECIFICATIONS
3

20MHzOSCILLOSCOPE 30MHzOSCILLOSCOPE40MHzOSCILLOSCOPE50MHzOSCILLOSCOPE
2~20MHz:1.5DIV20~30MHz:2.5DIV30~40MHz:3.0DIV40~50MHz:3.0DIV
4
MODEL
SPECIFICATIONS
CALIBEATION
VOLTAGE
CRT
Waveform
Frequency
Dutyratio
Outputvoltage
Outputimpedance
Type
Phosphor
Accelerationvoltage
Effectivescreensize
Graticule
Tracerotation
Positive-goingsquarewave
Approx.1kHz
2Vp-p
+
/-
2%
Approx.1Kohm
Within48:52
6-inchrectangulartype,internalgraticule
P31
Approx.2kV
8x10DIV(1DIV=10mm(0.39in))
Internal
Provided
LinePowerRequirements
Voltage:AC110V/220V±10%
Frequency:50Hzor60Hz
OperatingEnvironment
Indooruse
Altitudeupto2000m
Ambienttemperature:
Tosatisfyspecifications:l0to35C(50to95F)
Maximumoperatingranges:0to40C(32to104F)
Relativehumidity:75%RH(max.)nonCondensing
InstallationCategoryII
Pollutiondegree2
Accessories
Powercordl
Usermanual1
Probes2
┈┈┈
┈┈┈
┈┈┈┈┈
MechanicalSpecifications
StorageTemperature&Humidity
-10to70C,70%RH(maximum)
Dimensions:310Wx150Hx455D(mm)
Weight:Approx.8kg(l7.6lbs.)
Powerconsumption:Approx.40VA,35W(max.)
Note:AC110Vneedstoprearrangetomyfactory.
Approx.2kV Approx.12kV
20MHzOSCILLOSCOPE 30MHzOSCILLOSCOPE40MHzOSCILLOSCOPE50MHzOSCILLOSCOPE
Approx.12kV
5
3.PRECAUTIONSBEFOREOPERATINGTHEOSCILLOSCOPE
3.1UnpackingtheOscilloscope
Theoscilloscopeisshippedfromthefactoryafterbeingful1yinspectedandtested.Uponreceivingtheinstrument,
immediatelyunpackandinspectitforanydamagesthatmighthavebeensustainedduringtransportation.Ifanysignof
damageisfound,immediatelynotifythebearerand/orthedealer.
3.2CheckingtheLinevoltage
TheseoscilloscopeswilloperateonAC230Vor110Vsetbymanufactory.BeforeconnectingthepowerplugtoanAC
lineoutlet,makesurethevoltageselectorissettothecorrectpositioncorrespondingtothelinevoltage.Notethe
oscilloscopemaybedamagedifitisconnectedtothewrongAClinevoltage.
Replacetherequiredfusesshownbelow.
LinevoltageFuse
T0.5A
AC230V250V
T1.0A
AC110V250V
WARNING.Toavoidpersonalinjudisconnectthepowercordry,
beforeremovingthefuseholder
WARNING.Toavoidelectricalshockthepowercordprotective
groundingconductormustbeconnectedtoground.
!
!
Range
207~253
109~121
6
3.3Environment
Thenormalambienttemperaturerangeofthisinstrumentis0to40C(32to104F).Operationoftheinstrumentabovethis
temperaturerangemaycausedamagetothecircuits.
Donotusetheinstrumentinaplacewherestrongmagneticorelectricfieldexists,suchfieldsmaydisturbthemeasurement.
3.4EquipmentInstallation,andOperation
Ensurethereisproperventilationfortheholeventsintheoscilloscopecase.
Ifthisequipmentisusedinamannernotspecifiedbythemanufacturer,theprotectionprovidedbytheequipmentmaybe
impaired.
3.5CRTIntensity
TopreventpermanentdamagetotheCRTphosphor,donotmaketheCRTtraceexcessivelybrightorleavethespot
stationaryforanunreasonablylongtime.
3.6WithstandingvoltagesofInputTerminals
Thewithstandingvoltagesoftheinstrumentinputterminalsandprobeinputterminalsareasshowninthefollowingtable.
Donotapplyvoltageshigherthantheselimits.Whensetprobeswitchat1:1,themaximumeffectivereadoutis40Vpp
(14Vrmsatsinewave).Whensetprobeswitchat10:1,themaximumeffectivereadoutis400Vpp(140Vrmsatsinewave).
IfanACvoltagewhichissuperimposedonaDCvoltageisapplied,themaximumpeakvalueofCHlandCH2inputvoltages
mustnotexceed+or-300V.SoforACvoltageswithameanvalueofzerovoltthemaximumpeaktopeakvalueis600V.
Toavoidinstrumentdamage,
donotexceedmaximuminputvoltages.
Maximuminputvoltagesmusthave
frequencieslessthan1KHz.
CAUTION.
InputterminalMaximuminputvoltage
CH1,CH2,inputs400V(DC+ACpeak)
EXTTRLGINinput400V(DC+ACpeak)
Probeinputs600V(DC+ACpeak) !
7
Figure4-1
123
OSCILLOSCOPE
CAL
2Vp-p
1KHz
INTEN FOCUS TRACE
ROTATION POWER
7810 11 12 13 14 16 17 18 19 2021
!
!
!
+
-
-+
X10MAG
CAL
VERTICAL
X-Y
UNCAL
x10
POSITION
VOLTS/DIV
POSITION
VOLTS/DIV
AC
GND
DC
ALT
CHOP
AC
GND
DC
CH1
CH2
DUAL
ADD
MODE
CH2INV
CH1X CH2 Y
1M//25pFΩ1M//25pFΩ
mS
S.5
.2
.1 .5
.2
2
5
10
20
50
20
10
5
2
1
LEVEL SLOPE
1M//25pFΩ
TRIGIN
TRIG.ALT
TRIGGER
MODE SOURCE
AUTO
NORM
TV-V
TV-H
CH1
CH2
LINE
EXT
29 26 25 2428 27
1
2
5
V.5 .2 .1 50
20
10
5
mv
CAL
VAR
1
2
5
V.5 .2 .1 50
20
10
5
mv
CAL
VAR
9
46 22
15
DC
BAL
34
POSITION
SWP.VAR
DC
BAL
30
31
32
35
15250
1
uS
300V â…¡CAT
MAX.400Vpk
300V â…¡CAT
MAX.400Vpk
300V
CATâ…¡
MAX.
400Vpk
36
INPUT
OFF
ON
COMP.TEST
HORIZONTAL
TIME/DIV
37
8
8.8.8.8.8.8
1 2 3
OSCILLOSCOPE
CAL
2Vp-p
1KHz
INTEN FOCUS TRACE
ROTATION POWER
7810 11 12 13 14 16 17 18192021
!
!
!
+
-
-+
X10MAG
CAL
VERTICAL
X-Y
UNCAL
x10
POSITION
VOLTS/DIV
POSITION
VOLTS/DIV
AC
GND
DC
ALT
CHOP
AC
GND
DC
CH1
CH2
DUAL
ADD
MODE
CH2INV
CH1XCH2 Y
1M//25pFΩ1M//25pFΩ
mS
S.5
.2
.1 .5
.2
2
5
10
20
50
20
10
5
2
1
LEVEL SLOPE
1M//25pFΩ
TRIGIN
TRIG.ALT
TRIGGER
MODESOURCE
AUTO
NORM
TV-V
TV-H
CH1
CH2
LINE
EXT
29 26 25 2428 27
1
2
5
V.5 .2 .1 50
20
10
5
mv
CAL
VAR
1
2
5
V.5 .2 .1 50
20
10
5
mv
CAL
VAR
9
46 22
15
DC
BAL
34
TIME/DIV
POSITION SWP.VAR
DC
BAL
HORIZONTAL
30
3132
35
15250
1
S
m
300V â…¡CAT
MAX.400Vpk
300V â…¡CAT
MAX.400Vpk
300V
CATâ…¡
MAX.
400Vpk
33
9
Figure4-2
AC
~
!ENSURETHEPOWERISREMOVEDFROM
THEINSTRUMENTBEFOREREPLACINGTHEFUSE
38 39
!WARNING
TOAVOIDELECTRICSHOCKTHEPOWERCORDPROTECTIVEGROUNDING
CONDUCTORMUSTBECONNECTEDTOGROUND.
FORCONTINUEDFIREPROTECTION.REPLACEONLYWITHSPECIFIED
TYPEANDRATEDFUSE.
NOOPERATORSERVICEABLECOMPONENTSINSIDE.DONOTREMOVE
COVERS.REFERSERVICINGTOQUALIFIEDPERSONNEL.
POWERMAX.35WATTS,40VA
LINEVOLTAGE
SELECTION
220V
RANGE
(50/60Hz)
198~242V
FUSE
110V 109~121V
T0.5A
250V
T1A
250V
4.OPERATIONMETHOD
4.1lntroductionofFrontPanel
CRT:.
POWER...............................(6)
Mainpowerswitchoftheinstrument.Whenthisswitchisturnedon,theLED(5)isalsoturnedon.
INTEN.................................(2)
Controlsthebrightnessofthespotortrace.
FOCUS................................(3)
Forfocusingthetracetothesharpestimage.
TRACEROTATION..............(4)
Semi-fixedpotentiometerforaligningthehorizontaltraceinparallelwithgraticulelines.
FILTER................................(35)
Filterforeaseofwaveformviewing.
CHl(X)input..........................(8)
VerticalinputterminalofCH1.WheninX-Yoperation,X-axisinputterminal.
CH2(Y)input..........................(20)
VerticalinputterminalofCH2.WheninX-Yoperation,Y-axisinputterminal.
AC-GND-DC..........................(10)(18)
Switchforselectingconnectionmodebetweeninputsignalandverticalamplifier.
AC:ACcoupling
GND:Verticalamplifierinputisgroundedandinputterminalsaredisconnected.
DC:DCcoupling
VOLTS/DIV.............................(7)(22)
Selecttheverticalaxissensitivity,from5mV/DIVto5V/DIVin10ranges.
VerticalAxis:
10
VARIABLE.......................(9)(21)
Fineadjustmentofsensitivity,withafactorof1/2.5oftheindicatedvalue.WhenintheCALposition,sensitivityis
calibratedtoindicatedvalue.
CH1&CH2DCBAL.(13)(17)
Theseareusedfortheattenuatorbalanceadjustment.Seepage26DCBALadjustmentsforthedetails.
POSITION.................(11)(19)
Verticalpositioningcontroloftraceorspot.
VERTMODE.....................(14)
SelectoperationmodesofCHlandCH2amplifiers.
CH1:Theoscilloscopeoperatesasasingle-channelinstrumentwithCH1alone
CH2:Theoscilloscopeoperatesasasingle-channelinstrumentwithCH2alone.
DUAL:Theoscilloscopeoperatesasadual-channelinstrumentbothCH1andCH2.
ADD:Theoscilloscopedisplaysthealgebraicsum(CHl+CH2)ordifference(CH1-CH2)ofthetwosignals.
ThepushedinstateofCH2INV(16)buttonisforthedifference(CHl-CH2).
ALT/CHOP...........................(12)
Whenthisswitchisreleasedinthedual-tracemode,thechannellandchannel2inputsarealternatelydisplayed
(normallyusedatfastersweepspeeds).
Whenthisswitchisengagedinthedual-tracemode,thechannel1andchannel2inputsarechoppedanddisplayed
simultaneously(normallyusedatslowersweepspeeds).
CH2INV................................(16)
InvertstheCH2inputsignalwhentheCH2INVswitchmodeispushedinThechannel2inputsignalinADDmodeand
thechannel2triggersignalpickoffarealsoinverted.
11
≥
Triggering:
EXTTRIGINinputterminal...............(25)
SOURCE....................(24)
TRIG.ALT.............(28)
Inputterminalisusedforexternaltriggeringsignal.Tousethisterminal,setSOURCEswitch(24)totheEXTposition.
Selecttheinternaltriggeringsourcesignal,andtheEXTTRIGINinputsignal.
CHl:WhentheVERTMODEswitch(14)issetintheDUALorADDstate,selectCHlfortheinternaltriggeringsource
signal.
CH2:WhentheVERTMODEswitch(14)issetintheDUALorADDstate,selectCH2fortheinternaltriggeringsource
Signal.
LINE:ToselecttheACpowerlinefrequencysignalasthetriggeringsignal.
EXT:TheexternalsignalappliedthroughEXTTRIGINinputterminal(25)isusedfortheexternaltriggeringsourcesignal.
:
WhentheVERTMODEswitch(14)issetintheDUALorADDstate,andtheSOURCEswitch(24)isselectedatCHlor
CH2,withtheengagementoftheTRIG.ALTswitch(28),itwillalternatelyselectCH1&CH2fortheinternaltriggering
sourcesignal.
12
SLOPE...................(27)
selectthetriggeringslope.
"+":Triggeringoccurswhenthetriggeringsignalcrossesthetriggeringlevelinpositive-goingdirection.
"-":Triggeringoccurswhenthetriggeringsignalcrossesthetriggeringlevelinnegative-goingdirection.
13
LEVEL...................(29)
Todisplayasynchronizedstationarywaveformandsetastartpointforthewaveform.
Towards:"+":
Towards:"-":Thetriggeringlevelmovesdownwardonthedisplaywaveform.
TRIGGERMODE.......................(26)
Selectthedesiredtriggermode.
AUTO:Whennotriggeringsignalisappliedorwhentriggeringsignalfrequencyislessthan25Hz,sweeprunsin
thefreerunmode.
NORM:Whennotriggeringsignalisapplied,sweepisinareadystateandthetraceisblankedout.Usedprimarily
forobservationofsignal25Hz.
TV-V:Thissettingisusedwhenobservingtheentireverticalpictureoftelevisionsignal.
TV-H:Thissettingisusedwhenobservingtheentirehorizontalpictureoftelevisionsignal.
(BothTV-VandTV-Hsynchronizeonlywhenthesynchronizingsignalisnegative.)
Thetriggeringlevelmovesupwardonthedisplaywaveform.
FAMILY.........(33)
.
Displayasynchroninzdesignalfrequency(modelshavethisfunctiononly)
Others
CAL................(1)
Thisterminaldeliversthecalibrationvoltageof2Vp-p,approx.1KHz,positivesquarewave.
GND...............(15)
Groundterminalofoscilloscopemainframe.
TimeBase
TIME/DIV.............................(30)
Sweeptimerangesareavailablein20stepsfrom0.2uS/DIVto0.5S/DIV.
X-Y:ThispositionisusedwhenusingtheinstrumentasanX-Yoscilloscope.
SWP.VAR..................................(31)
Verniercontrolofsweeptime.ThiscontrolworksasCALandthesweeptimeiscalibratedtothevalueindicatedby
TIME/DIVofweepcanbevariedcontinuouslywhenShaftisoutofCALposition.Thenthecontrolisrotatedinthe
directionofarrowtothefull,theCALstateisproducedandthesweeptimeiscalibratedtothevalueindicatedby
TIME/DIV.Counterclockwiserotationtothefulldelaysthesweepby2.5timeormore.
X10MAG..................................(32)
Whenthebuttonispushedin,amagnificationofl0occurs.
POSITION..........................(34)
Horizontalpositioningcontrolofthetraceorspot.
14
4.21ntroductionofRearPanel
STUDS..................................(38)
Forlayingtheoscilloscopeonitsbacktooperateitintheupwardposition.Alsousedtotakeupthepowercord.
ACPowerinputconnector.........(39)
ACPowerinputsocket.ConnecttheACpowercord(supplied)tothisconnector.
INPUT.............(36) inputterminal
OFF/ON....................(37)
Componenttest.
4.3BasicOperation--Single-channelOperation
BeforeconnectingthepowercordtoanAClineoutlet,makesurethatthevoltageselectorontherearpaneloftheinstrument
iscorrectlysetfortheAClinevoltage.Afterensuringthevoltagesetting,Settheswitchesandcontrolsoftheinstrumentas
shownbelow:
15
ItemNoSetting
SLOPE(27)+
TRIG.ALT(28)Released
TRIGGERMODE(26)AUTO
TIME/DIV(30)0.5mSec/DIV
SWP.VER(31)CALposition
POSITION(34)Mid-position
Xl0MAG(32)Released
LEVEL(29)Locked
ItemNoSetting
POWER(6)Disengageposition(OFF)
INTEN(2)Mid-position
FOCUS(3)Mid-position
VERTMODE(14)CHl
ALT/CHOP(12)Released(ALT)
CH2INV(16)Released
POSITION(11)(19)Mid-position
VOLTS/DIV(7)(22)0.5V/DIV
VARIABLE(9)(21)CAL(clockwiseposition)
AC-GND-DC(10)(18)GND
SOURCE(24)CHl
Aftersettingtheswitchesandcontrolsasmentioned,connectthepowercordtotheAClineoutlet,andthencontinueasfollows:
1)EngagethePOWERswitchandmakesurethatthepowerLEDisturnedon.Inabout20seconds,atracewillappearon
theCRTscreen.Ifnotraceappearsinabout60seconds,counterchecktheswitchandcontrolsetting.
2)AdjustthetracetoanappropriatebrightnessandimagewiththeINTENcontro1andFOCUScontrolrespectively.
3)AlignthetracewiththehorizontalcenterlineofthegraticulebyadjustingtheCH1POSITIONcontrolandTRACE
ROTATIONcontrol(adjustablebyscrewdriver).
4)ConnecttheprobetotheCH1INPUTterminalandapplythe2Vp-pCALIBRATORsignaltobeprobetip.
5)SettheAC-GNDDCswitchtotheACstate.Awaveformasshowninthefigure4-3
WillbedisplayedontheCRTscreen.
6)AdjusttheFOCUScontrolsothatthetraceimageappearssharply
7)Forsignalviewing,settheVOLTS/DIVswitchandTIME/DIVswitchinappropriate
positionssothatsignalwaveformisdisplayedclearly.
8)AdjustthePOSITIONandPOSITIONcontrolsinappropriatepositionssothatthe
displayedwaveformisalignedwiththegraticuleandvoltage(Vp-p)andperiod(T)canbe
readconveniently.
Theabovearethebasicoperatingproceduresoftheoscilloscope.Itisforsingle-channeloperationwithCh1.Single-channel
operationwithCH2canalsobeachievedinasimilarmanner.Furtheroperationmethodsareexplainedinthesubsequentpages.
ChangetheVERTMODEswitchtotheDUALstatessothattrace(CH2)isalso
displayed(TheexplanationintheproceedingsectionisofCH1).Atthisstateof
Procedure,theCHltraceisthesquarewaveofthecalibratorsignalandtheCH2
traceisastraightlinesincenosignalisappliedtothischannelyet.
NowapplythecalibratorsignaltotheverticalinputterminalofCH2withthe
probeasisthecaseforCH1.SettheAC-GND-DCswitchtotheACstate.Adjust
verticalPOSITIONknobs(11)and(19)sothatbothchannelsignalsaredisplayed
asshowninFigure4-4
-
.
,
4.4Dual-channelOperation
Figure4-3
Figure4-4
SignalofCH1
16
SignalofCH2
WhenALT/CHOPswitchisreleased(ALTMODE),theinputsignalsappliedrespectivelytoCHlandCH2appearsonthe
screenalternativelyateachsweep.Thissettingisusedwhenthesweeptimeisshortin2-channelobservation.
WhenALT/CHOPswitchisengaged(CHOPMODE),theinputsignalsappliedtoCH1andCH2areswitchedatabout250KHz
Wheninthedualchanneloperation(DUALorADDmode),theCHlorCH2signalmustbeselectedforthetriggeringsource
signalbymeansoftheSOURCEswitch.IfbothCHlandCH2signalsareinasynchronizedrelationship,bothwaveformscanbe
displayedstationary;ifnot,onlythesignalselectedbytheSOURCEswitchcanbestationary.IftheTRIG.ALTpushswitchis
engaged,bothwaveformscanbedisplayedstationary.
AnalgebraicsumoftheCH1andCH2signalscanbedisplayedonthescreenbysettingtheVERTMODEswitchtotheADD
State.ThedisplayedsignalisthedifferencebetweenCHlandCH2signalsiftheCh2INVpushswitchisengaged.
Foraccurateadditionorsubtraction,itisaprerequisitethatthesensitivitiesofthetwochannelsareadjustedaccuratelyatthe
samevaluebymeansoftheVARIABLEknobs.VerticalpositioningcanbemadewiththePOSITIONknobofeitherchannel.
Inviewofthelinearityoftheverticalamplifiers,itismostadvantagetosetbothknobsintheirmid-positions.
Propertriggeringisessentialforefficientoperationofanoscilloscope.Theusermustbethoroughlyfamiliarwiththe
triggeringfunctionsandprocedures.
(1)FunctionsofMODEswitch:
AUTO:WhentheAUTOswitchisengaged,automaticsweepoperationisselected.inautomaticsweepoperation,thesweep
generatorfreerunstogenerateasweepwithoutatriggersignal.However,itautomaticallyswitchestotriggeredsweep
operationifanacceptabletriggersourcesignalispresent.TheAUTOpositionishandywhenfirstsettingupthescopeto
observeawaveform;Itprovidessweepforwaveformobservationuntilothercontrolscanproper1yset.Oncethecontrols
areset,operationisoftenswitchbacktotheNORMtriggeringmode,sinceitismoresensitive.Automaticsweepmustbe
usedforDCmeasurementsansignalsofsuchlowamplitudethattheywillnottriggerthesweep.
independentandatthesametimeappearonthescreen.Thissettingisusedwhenthesweeptimeislongin2-channelobservation
4.5ADDOperation
4.6Triggering
17
NORM:TheNORMswitchprovidesnormalredsweepoperationThesweepremainsatrestuntiltheselectedtrigger
sourcesignalcrossesthethresholdlevelsetbytheTRIGLEVELcontrol.Thetriggercausesonesweeptobegenerated.
afterwhichsweepagainremainsatrestuntiltriggered.IntheNORMposition,therewillbenotraceunless
anadequatetriggersignalispresent-IntheALTmodeofdualtraceoperationwithNORMsweepselected,therewill
betraceunlessbothchannel1and2signalsareadequatefortriggering.
TV-V:SettingtheMODEswitchtotheTV-Vpositionpermitsselectionofverticalsyncpulsesforsweeptriggeringwhen
viewingcompositevideowaveforms.Verticalsyncpulsesareselectedastriggertopermitviewingofverticalfields
andframesofvideo.Asweeptimeof2ms/DIVisappropriateforviewingfieldsofvideoand5ms/DIVforcomplete
frames(twointerlacedfields)ofvideo.
TVH:SettingtheMODEswitchtotheTV-Hpositionpermitsselectionofhorizontalsyncpulsesforsweeptriggeringwhen
viewingcompositevideowaveforms.Horizontalsyncpulsesareselectedastriggertopermitviewingofhorizontal
fieldsofvideoAsweeptimeofabout10us/DIVisappropriatefordisplayinglinesofvideo.TheSWPVARcontrol
canbesettodisplaytheexactnumberofwaveformsdesired.
isoscilloscopesynchronizeswithonly()polarity,thatis,thesyncpulsesarenegativeandthevideoispositiveas
showninFigure4
(2)FunctionsofSOURCEswitch:
Thedisplayedsignalitselforatriggersignalwhichhasatime
relationshipwiththedisplayedsignalisrequiredtobeappliedtothe
triggercircuittodisplayastationarysignalontheCRTscreen.
TheSOURCEswitchisusedforselectingsuchatriggeringsource
CHl/CH2:Theinternaltriggermethodwhichisusedmostcommonly.Thesignalappliedtotheverticalinputterminal
isbranchedofffromthepreamplifierandisfedtothetriggercircuitthroughtheVERTMODEswitch.Sincethe
triggeringsignalisthemeasuredsignalitself,astablewavefromcanbereadilydisplayedontheCRTscreen.When
intheDUALorADDoperation,thesignalselectedbytheSOURCEswitchisusedasthetriggeringsourcesigna1.
trigge.
-
.
Th-
-5
.Figure4-5
18
Line:TheACpowerlinefrequencysignalisusedasthetriggeringsignal.Thismethodiseffectivewhenthemeasured
signalhasarelationshipwiththeAClinefrequency,especiallyformeasurementsoflowlevelACnoiseofaudio
equipment,thyristorcircuits,etc.
EXT:Thesweepistriggeredwithanexternalsignalappliedtotheexternaltriggerinputterminal.Anexternalsignal
whichhasaperiodicrelationshipwithrespecttothemeasuredsignalisused.Sincethemeasuredsignalisnotused
asthetriggeringsignal,thewaveformscanbedisplayedmoreindependentthanthemeasuredsignal.
(3)FunctionsofTRIGLEVELcontrolandSLOPEswitch:
Asweeptriggerisdevelopedwhenthetriggersourcesignalcrossesapresetthresholdlevel.RotationoftheTRIGLEVEL
controlvariesthethresholdlevel.Inthe"+"direction,thetriggeringthresholdshiftstoamorepositivevalue,andinthe"-"
direction,thetriggeringthresholdshiftstoamorenegativevalue.Whenthecontroliscentered,thethresholdlevelissetat
theapproximateaverageofthesignalusedasthetriggeringsource.
TheTRIGLEVELcontroladjuststhestartofthesweeptoalmostanydesiredpointonawaveform.Onsinewavesignals,
thephaseatwhichsweepbeginsisvariable.NotethatiftheTRIGLEVELcontrolisrotatedtowarditsextreme+or-setting,
nosweepwillbedevelopedinheNORMtriggermodebecausetriggeringthresholdexceedsthepeakamplitudeofthe
syncsignal.
Slope
"-"Range
Figure4--6
Level
+
-
Slope
"+"Range
19
WhentheTRIGSLOPEswitchissettothe(+)position(up),
thesweepisdevelopedfromthetriggersourcewaveformasit
crossesthethresholdlevelinapositive-goingdirection.When
theTRIGSLOPEcontrolissettothe(-)position(down),asweep
triggerisdevelopedformthetriggersourcewaveformasit
crossesthethresholdlevelinanegative-goingdirection.This
switchselectstheslope(polarity)triggeringsignalasshownin
Figure4-6
(4)FunctionofTRIGALTswitch:
TheTRIGALTswitchisusedtoselectalternatetriggeringandalternatedisplaywhentheDUAL-traceVERTMODEis
selected(theswitchhasoneffectintheCH1,CH2,orADDmodes).Inthealternatetriggeringmode(whendual-traceoperation
isselected),thetriggersourcealternatesbetweenchannellandchannel2witheachsweep.Thisisconvenientforchecking
amplitudes,waveshape,orwaveformperiodmeasurements,andevenpermitssimultaneousobservationoftwowaveformswhich
arenot-relatedinfrequencyorperiod.However,thissettingisnotsuitableforphaseortimingcomparisonmeasurements.For
suchmeasurements,bothtracesmustbetriggeredbythesamesyncsignal.
WhentheCHOPandtheTRIGALTswitchesarebothengagedduringdual-traceoperation,synchronizationofthedisplayisnot
possiblebecausethechoppingsignalbecomesthetrigger.UsetheALTmodebyitself,orselectCH1orCH2astriggersource.
SettheTIMEDIVcontroltodisplaythedesirednumberofcyclesofewaveform.Iftherearetoomanycyclesdisplayedfor
goodresolution,switchtoafastersweepspeedIfonlyalineisdisplayed,tryaslowersweepspeed.Whenthesweepspeedis
fasterthanthewaveformbeingobserved,onlypartofitwillbedisplayed,whichmayappearasastraightlineforasquarewave
orpulsewaveform.
Whenacertainpartofthedisplayedwaveformisneededtobeexpandedtimewise,afaster
sweepspeedmaybeused.However,iftherequiredportionisapartfromthestartingpoint
ofthesweep,therequiredportionmayrunofftheCRTscreen.Insuchacase,push
thex1MAGbutton.Whenthishasbeendone,thedisplayedwaveformwillbe
expanded10timestotherightandletwiththecenterofscreenasthecenterof
xpansion.Thesweeptimeduringthemagnificationoperationisasfollows:
(ValueindicatedbyTIME/DIVswitch)x1/10
Thus,theunmagnifiedmaximumsweepspeed(luebeincreased
withthemagnificationasfollows: luSec/DIVx1/10=100nSec/DIV
4.7TIME/DlVcontrol
4.8SweepMagnification
/th
.
in
0f
e
Sc/DIV)can
10xmagnification
Anypartcanbecoveredby
meansofPOSITIONcontrol
Figure4-7
20
4.9X-YOperation
SettheTIME/DIVswitchtoX-Yposition.Thentheinstrumentworksasan
X-Yoscilloscope.Eachinputisappliedtotheinstrumentasfollows.
X-axissignal(horizontalaxissignal):CH1INPUT.
Y-axissignal(verticalaxissignal):CH2INPUT.
Note:WhenhighfrequencysignalsaredisplayedintheX-Yoperation,pay
attentiontothefrequencybandwidthsandphasedifferencebetweenXandY-axis.
X-Yoperationpermitstheoscilloscopetoperformmanymeasurementsnotpossiblewithconventionalsweepoperation.The
CRTdisplaybecomesanelectronicgraphoftwoinstantaneousvoltages.Thedisplaymaybeadirectcomparisonofthetwo
voltagessuchasavectorscopedisplayofvideocolorbarpatterns.However,theX-Ymodecanbeusedtographalmostany
dynamiccharacteristicifatransducerisusedtochangethecharacteristic(frequency,temperature,velocity,etc.)intoavoltage.
Onecommonapplicationisfrequencyresponsemeasurements,wheretheY-axiscorrespondstosignalamplitudeandtheX-axis
correspondstofrequency.
1.SettheTIME/DIVcontroltotheX-Yposition(fullycounterclockwise).Inthismode,channel1becomestheX-axis
Inputandchannel2becomestheY-axisinput.
2.TheXandYpositionsarenowadjustedusingthehorizontalPOSITIONandC2POSITIONcontrols
respectively.
3.Adjusttheamountofvertical(Y-axis)deflectionwiththeCH2VOLTS/DIVandVARcontrols.
4.Adjusttheamountofhorizontal(X-axis)deflectionwiththeCH1VOLTS/DIVandVARcontrols.
H
Yaxis(CH2)
Xaxis
(CH1)
Figure4-8
21
4.10CalibrationofProbe
Asexplainedpreviously,theprobemakesupawiderangeattenuator.Unlessphasecompensationisproperlydone,the
displayedwaveformisdistortedcausingmeasurementerrors.Therefore,theprobemustbeproperlycompensatedbeforeuse.
Connectthel0:lprobeBNCtotheINPUTterminalofCH1orCH2andsetVOLTS/DIVswitchat50mV.Connectthe
Probetiptothecalibrationvoltageoutputterminalandadjustthecompensationtrimmeronprobeforoptimumsquarewave
(minimumovershoot,roundingoffandtilt).
Figure4-9
(a)Correctcompensation(b)Overcompensation (c)Insufficientcompensation
4.11DCBALAdjustments
TheATTbalanceoftheverticalaxiscanbemadeeasily.
(1)SettheinputcouplingswitchesofCH1andCH2toGNDandsettheTRIGMODEtoAUTO.Thenpositionthe
Baselinetothecenter.
(2)TurntheVLOTS/DIVswitchto5mV-10mVandadjustsothatthelinedoesnotmove.
22
5.MAINTENANCE
Thefollowinginstructionsareforusebyqualifiedpersonnelonly.Toavoidelectricalshock,donotperformany
servicingotherthanintheoperatinginstructionsunlessyouarequalifiedtodoso.
5.1FuseReplacement
Ifthefuseblows,thepowerlampindicatorswillnotlightandtheoscilloscopewillnotoperate.Thefuseshouldnotnormallyopen
unlessaproblemhasdevelopedintheunit.Trytodetermineandcorrectthecauseoftheblownfuse.Therep1aceonlywithafuseofthecorrect
ratingandtype(seepage5)
Thefuseislocatedontherearpanel(seefig.4-2).
5.2Cleaning
Tocleantheoscilloscope,useasoftclothdampenedinasolutionofmilddetergentandwater.Donotspraycleanerdirectlyon
totheoscilloscopebecauseitmayleakintothecabinetandcausedamage.
Donotusechemicalscontainingbenzine,benzene,toluene,xylene,acetone,orsimilarsolvents.
Donotuseabrasivecleanersonanyportionoftheoscilloscope.
WARNING
WARNING Forcontinuedfireprotection.Replacefuseonlywith250Vfuseofthe
specifiedtypeandrating,anddisconnectpowercordbeforereplacingfuse.
!
23
6.ComponentTestOperation(OnlyTypeT)
Thecomponenttestboarddeliversasinevoltage(50Hzor60Hz)whichisappliedacrossthecomponentundertest.The
sinevoltageacrossthetestobjectisusedforthehorizontaldeflection(V)andvoltage-drop(currentthroughthetestobject)
isusedforverticaldeflection(I)oftheoscilloscope.
BythisV-Icharacteristiccurve,thegoodorfaultofcomponentismeasured.
7.Tosetuptheoscilloscope(OnlyTypeT)forcomponenttestoperation,proceedasfollows:
1.TurnTIME/DIVswitchtotheX-YpositionandsetbothverticalcouplingswitchestoDCpositionaswellassetting
upthebothVOLTS/DIVknobCH1(X)to5V/DIV,CH2(Y)to2V/DIV,thenpushtheCOMP.TESTSWToTEST
position.
2.Thenhorizontalbargraphofabout5~6divisdisplayedonthescreen.
3.ThepositionofgraphiscontrolledwithCH2POSITIONandH-POSITION.
4.Componetsmaybedirectlyhookedtotestingcode.Thenwaveformchartisdisplayedonthescreen.
8.Testcondition
1.Resitor,capacitor,coil,diode,zenerorsimplecombinationofthecomponentscanbetested.
2.Testingvoltage:approx.9VACp-p
3.Testingfrequency:50/60Hz
4.Testingcurrent:approx.0.6mA
9.<CAUTION>
1.Usingthecomponenttestfunction,don'tapplythesingaltotheCH1andCH2inputbecausetheoscilloscopedoesn't
operateinthecomponenttestmode.
2.Don'tpushX10MAGswitchbecausethebarwillbefatted.
3.Don'ttestthelivecircuit(operatingthepowersignal)component.
24
10.WAVEFORMCHART
Resisterr
Capacitor CoilZener
BIG
MID
SMALL SMALLSMALL
MIDMID
BIG BIG
Diode
25
11.BLOCKDIAGRAM
2Vp-p/1KHz
50/60Hz
-H.V.
CH1(X)
INPUT
CH1SIGNAL
ONTPUT
CH1
PREAMP
CH1
TRIG(X-AXIS)
PICKUPAMP VERT
SIGNAL
VERTICAL
MODESWITCH
VERTICAL
OUTPUTAMP
CH2(Y)
INPUT
CH2ATT CH2
PREAMP SWITCHING
LOGIC CRTCIRCUIT
H.V.SUPPLY
CH2
TRIG
PICKUPAMP TRIGSWITCH
X-AXISSIGNAL
CH1
CH2
EXT
LINE
TRIGGER
GENERATOR
TRIGGERINPUT
AMP
LINETRIG
AUTOCIRCUIT
(A)SWEEP
GENERATOR
FREERUN
SIGNAL
HORIZONTAL
SWITCHING HORIZONTAL
OUTPUTAMP
POWERSUPPLY
TOEACH
BLOCK
CALIBRATOR
SQUARE-WAVE
ACLINE
TRIG
SIGNAL
26 Specificationsaresubjecttochangewithoutnotice.
CH1ATT
40/50MHzonly
+12kv
-
1
-
2
-
3
-
4
-
5
-
6
-
7
-
8
-
9
-
10
-
11
-
12
-
13
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14
-
15
HTC 5020C Dual Trace Oscilloscope User manual
- Type
- User manual
- This manual is also suitable for
The HTC 5020C Dual Trace Oscilloscope is a versatile and easy-to-use instrument designed for a wide range of applications in electronics, telecommunications, and education. With its 20MHz bandwidth, 5mV/DIV sensitivity, and dual-channel operation, the HTC 5020C allows users to observe and analyze complex waveforms with precision and clarity. It features a bright and sharp 6-inch rectangular CRT display with an internal graticule for accurate measurements, and a comprehensive set of controls for adjusting sweep time, triggering, and vertical sensitivity.
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