HTC -5020C Dual Trace Oscilloscope User manual

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User manual

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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
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HTC -5020C Dual Trace Oscilloscope User manual

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