Kenwood CS-3025 User manual

20MHz COMPACT OSCILLOSCOPE
INSTRUCTION MANUAL
KENWOODCORPORATION
©PRINTED IN JAPANB50-7683-00(T)
90/12111098765432189/12 11 1098765432
CS-3025
KENWOOD

SAFETY
Symbol in This Manual
This symbolindicateswhereapplicablecautionaryorotherimformationistobefound.
Power Source
This equipmentoperates from a powersourcethatdoesnotapplymorethan250V rms
betweenthesupplyconductorsorbetweeneithersupplyconductorandground.A pro-
tectivegroundconnectionbywayofthegroundingconductorinthepowercordis essen-
tialfor safe operation.
GroundingtheProduct
This equipmentisgrounded through thegroundingconductorofthepowercord.Toavoid
electrical shock,plugthepowercord into a properlywiredreceptaclebeforeconnecting
totheequipment input or output terminals.
Use theProperPowerCord
Use onlythepowercordandconnectorspecifiedforyourproduct.
Use theProper Fuse
To avoidfirehazard,usea fuseofthecorrecttype.
DonotOperateinExplosiveAtmospheres
To avoidexplosion,donotoperatethisproductinanexplosiveatmosphere.
DonotRemoveCoveror Pane!
To avoidpersonalinjury,donotremovethecoverorpanel. Refer servicingtoqualified
personnel.
VoltageConversion
Ifthepowersourceisnotappliedtoyourproduct,contactyourdealer.Toavoidelectrical
shock, donotperformthevoltageconversion.
2

CONTENTS
SAFETY 2
OVERVIEW ANDCONFIGURATION4
SPECIFICATIONS 5
PREPARATION FORUSE7
CONTROLSANDINDICATORS9
FRONTPANEL9
REAR PANEL14
BOTTOM PANEL15
OPERATION• 16
INSTALSTARTINGPROCEDURE16
[1] NORMAL SWEEP DISPLAYOPERATION16
[2] MAGNIFIED SWEEP OPERATION19
[3]X-YOPERATION19
[4]VIDEOSIGNALOBSERVATION19
APPLICATION20
PROBE COMPENSATION20
TRACE ROTATIONCOMPENSATION20
DCVOLTAGEMEASUREMENTS20
MEASUREMENTOFTHEVOLTAGE BETWEEN TWOPOINTSONA WAVEFORM22
ELIMINATION OFUNDESIREDSIGNALCOMPONENTS23
TIMEMEASUREMENTS24
FREQUENCY MEASUREMENTS24
APPLICATIONOFX-YOPERATION26
MAINTENANCE ANDADJUSTMENT27
MAINTENANCE 27
ADJUSTMENT28
3

OVERVIEW ANDCONFIGURATION
OVERVIEW
This unit isa compact,light-weight,highperformanceportableoscilloscopeequipped with
rectangularCRT with internalgraticule.
The frequencybandwidthof20MHzandselectablesweeptimeof0.2jis/divto1 s/div
forthevertical axis allowsusefora widerangeofapplications.Itisalsoequipped with
such featuresasmagnificationfunctionsfortheverticalandhorizontal axes, singlesweep
function,andTV sync function. These featuresmakeittheidealoscilloscopefortheservice
benchandvarioustypesofmaintenance.
CONFIGURATION
The following itemsarecontainedinthepacking case. Whenunpacking,makesurethat
all itemshavebeenincluded.
Oscilloscope 1 pc.
Probe (PC-30) 2 pes.
Panel cover1 pc.
Instructionmanual1 pc.
Inaddition,the following arealsoavailableasoptional accessories (soldseparately).
Carrying case (soft)MC-81
Carrying case (hard)MC-82
4

SPECIFICATIONS
CRT
Type RectangularhighluminanceCRT(withinternal
graticule)
Acceleration VoltageApprox.1.8kV
Display Area 8x10divflat-face(1div= 6.35mm)
VERTICAL AXIS
OperatingModesCH1,CH2,ALT, CHOP, ADD
Sensitivity 5 mV/divto5 V/div,+/-3%
Sensitivity Magnification...5times+1-5% (x5 MAGused)
Attenuator1-2-5stepsequence,10ranges,adjustablebetween
ranges
Frequency Response
5 mV/divto5 V/divDC:DCto20MHz,-3dB
AC: 5 Hzto20MHz,-3dB
x5 MAGusedDC:DCto4 MHz,-3dB
AC: 5 Hzto4 MHz,-3dB
InputImpedance1 Mohm,approx.40pF
Rise Time17.5nsor less (20MHz)
Crosstalk -40dBminimum
Polarity InversionCH2only
Chop FrequencyApprox.50kHz
/\MaximumInputVoltage800Vp-por400V (DC + ACpeak)
HORIZONTAL AXIS
OperatingModesX-Yoperationselectable with sweepknob
X axis selectable with TRIG orX
Y axis selectable with V orY MODE
Sensitivity Same asvertical axis
InputImpedance Same asvertical axis
Frequency Response DC:DCto200kHz,-3dB
AC: 5 Hzto200kHz,-3dB
X-Y Phase Difference3°or less at10kHz
/f\MaximumInputVoltage Same asvertical axis
5

SWEEP
Sweep TypeNORM:Triggeringsweep
AUTO: Sweep freerunsinabsenceof trigger
Sweep Time0.2^s/divto1 s/div+/-3%in21ranges,1-2-5se-
quence, adjustablebetweenranges
Sweep Magnification5 times+/-5%
A
TRIGGERING
Internal Sync INT, LINE
External Sync EXT
External Sync Input
Impedance 1 Mohm,Approx.90pF
MaximumExternalTrigger
Voltage50V (DC + ACpeak)
Sync CouplingAC,DC,TV-V,TV-H
Polarity + /-
Trigger Sensitivity
Coupling
Frequency
Amplitude(Voltage)
Coupling
Frequency
INT
EXT
DC
DC~2 MHz
-20MHz 0.5div
1 div 0.1Vp-p
0.2Vp-p
AC
10Hz~2MHz
-20MHz 0.5div
1 div 0.1Vp-p
0.2Vp-p
TV-H, V
2 div 0.4Vp-p
CALIBRATION VOLTAGE Squarewave(positivepolarity)
1 Vp-p± 3%,1 kHz± 3%
POWER REQUIREMENTS
Power SupplyVoltageAC 100/120/220/240 V ±10%50/60Hz
Power ConsumptionApprox.22W (at100V AC)
DIMENSIONSANDWEIGHT
Dimensions. 216(width)x 89(height)x 298(depth)mm
WeightApprox.4 kg
OPERATING TEMPERATURE AND HUMIDITY FOR GUARANTEED SPECIFICATIONS
5 to35°C,85%maximumRH
ACCESSORIES Probe (PC-30) 2 pes.
InstructionManual1 pc.
Panel Cover1 pc.
6

PREPARATION FORUSE
SAFETY
Before connectingtheinstrumenttoa powersource,carefullyreadthe following infor-
mation,thenverifythattheproperpowercordisusedandtheproperlinefuseisinstalled
forpowersource.Thespecifiedvoltageisshownatthe left sideofthepowercordon
therearpanel.Ifthepowercordisnotappliedforspecifiedvoltage,thereis always a
certain amountofdanger from electricshock.
Line voltage
This instrumentoperatesusingAC-power input voltagesthat100/120/220/240V atfre-
quencies from 50Hzto60Hz.
Power cord
The groundwireofthe3-wireACpowerplug places the chassis andhousingofthe oscil-
loscope atearthground.Donotattempttodefeatthegroundwireconnectionorfloat
theoscilloscope;todosomayposea greatsafety hazard.
The appropriatepowercordissuppliedbyan option thatisspecifiedwhentheinstrument
is ordered.
The optionalpowercordsareshownasfollowsinFig.1.
Line fuse
The fuseholderislocatedontherearpanelandcontainstheline fuse. Verifythatthe
properfuseisinstalledbyreplacingtheline fuse.
EQUIPMENT PROTECTION
1. Neverallowa smallspotofhighbrilliancetoremainstationaryonthe screen formore
thana few seconds. The screen maybecomepermanentlyburned.A spotwilloccur
onlywhenthescopeissetupforX-Yoperationandnosignalisapplied.Eitherreduce
theintensitysothespotisbarelyvisible,switchbacktonormalsweepoperationwhen
nosignalisapplied,orsetupthescopeforspotblanking.
2. Nevercovertheventilatingholesonthetopoftheoscilloscope,asthiswill increase
theoperatingtemperatureinsidethe case.
3. Neverapplymorethanthemaximumratingtotheoscilloscopeinputs.
^CH1, CH2 INPUT jacks:
800 Vp-por400V (DC+AC peak)
EXT TRIG INPUT jack:
50 V (DC + AC peak)
Never applyexternalvoltagetotheoscilloscope output terminals.
4. Always connecta cable from theearthground(GND)terminaloftheoscilloscopeto
the chassis oftheequipmentundertest. Without thiscaution,theentirecurrentfor
theequipmentundertestmaybedrawn through theprobeclip leads undercertaincir-
cumstances. Such conditionscould also posea safety hazard, whichthegroundcable
willprevent.
5. Always usetheprobegroundclipsforbestresults.Donotuseanexternalgroundwire
inlieuoftheprobegroundclips,asundesiredsignalsmaybeintroduced.
7

6. OperationadjacenttoequipmentwhichproducesstrongACmagneticfieldsshouldbe
avoidedwherepossible.
This includessuchdevicesaslargepowersupplies,transformers,electricmotors,etc.,
thatareoftenfoundinanindustrialenvironment.Strongmagneticshieldscanexceed
thepracticalCRTmagneticshieldinglimitsandresultinterferenceanddistortion.
7. Probecompensationadjustmentmatchestheprobetotheinputofthescope.Forbest
results, compensationofprobeshouldbeadjustedinitially,thenthesameprobeal-
ways usedwiththeinputofscope.Probecompensationshouldbereadjustedwhenever
a probefroma differentscopeis used. (Seepage20)
8. InX-Yoperation,donotpulloutthe PULL x 5 MAGswitch.Ifpulledoutit,noisemay
appeare onthewaveform.
Plug configuration
Power cord
and plugtype
Factory installed
instrumentfuse
Line cordplugfuse
NorthAmerican
120volt/60Hz
Rated 15amp
(12ampmax;NEC)
0.5A,250V
Fast blow
AGC/3AG
None
Universal Europe
220volt/50Hz
Rated 16amp
0.3A,250V
Fast blow
5 x 20mm None
U.K.
240volt/50Hz
Rated 13amp
0.3A,250V
Fast blow
5x30mm
0.3A
Type C
Australian
240volt/50Hz
Rated 10amp
0.3A,250V
Fast blow
5x30mm None
NorthAmerican
240volt/60Hz
Rated 15amp
(12ampmax;NEC)
0.3A,250V
Fast blow
AGC/3AG
None
Switzerland
240volt/50Hz
Rated 10amp
0.3A,250V
Fast blow
AGC/3AG
5x30mm
None
Fig. 1 PowerinputVoltageConfiguration
8

CONTROLS ANDINDICATORS
FRONT PANEL
©POWER
Power switchfortheoscilloscope. Pressing this control onceturnsthepoweronand
pressing itagainturnsthepoweroff.
®Pilot Lamp
Lamp lightswhentheoscilloscopeison.
(3) CALTerminal
Voltageterminalforcalibrationofprobes.Providesanapproximately1 kHzsquarewave
at1 V with positivepolarity.
0$ POSITION/PULL x 5 MAG
Rotationadjuststhevertical position ofchannel1 traceonthedisplay.Pullingthisknob
increases thevertical axis sensitivity5 times.
®VOLTS/DIV
Sets thevertical axis sensitivityusingtheverticalattenuatorforchannel1. This knob
can beswitchedina 1-2-5sequence.Settingthe VARIABLE knob(6)totheCALposi-
tion providescalibratedvertical axis sensitivity.
DuringX-Yoperation,this control serves astheattenuatorfortheX axis orY axis.
9
Fig. 2-1

Fig. 2-2
© VARI (ABLE)
Rotationprovidesfinecontrolofchannel1 verticalattenuation.Allowscontinuousad-
justmentbetween VOLTS/DIV ranges. Inthefullyclockwise (CAL) position,theverti-
cal attenuatoriscalibrated.DuringX-Yoperation,thiscontrol serves astheX axis or
Y axis attenuatorfineadjustment.
© AC-GND-DC
This lever selects thecouplingmethodusedfortheCH1vertical axis input signal.
AC: InputsignalisACcoupled,andDCcomponentisblocked.
GND: Inputsignalandverticalamplifierareseparatedandinputtoverticalamplifier
is grounded. This allowsforconfirmationofthegroundpotential.
DC: InputsignalisDCcoupledallowingformeasurementincludingDCcomponent.
This lever servers astheX axis orY axis inputselectorduringX-Yoperation.
® CH1 INPUT
Vertical axis inputjackforchannel1. Serves astheX axis orY axis inputjackduring
X-Y operation.
(D$ POSITION/PULLx 5 MAG
Performs the same functionforchannel2 asthechannel1 * POSITION control. Serves
as theY positionadjustmentcontrolduringX-Yoperation.
10

©VOLTS/DIV
Vertical axis attenuatorforchannel2.Performsthesame function forchannel2 as
thechannel1 VOLTS/DIV control. Serves astheX axis orY axis attenuationadjust-
ment control during X-Yoperation.
© VARI (ABLE)
Rotationprovidesfine control ofchannel2 attenuation.Performsthesame function
forchannel2 asthechannel1 VARIABLE control. Serves astheX axis orY axis at-
tenuationfineadjustment control during X-Yoperation.
©AC-GND-DC
This leverselectsthecoupling method usedforthechannel2 vertical axis input signal.
Performsthesame function asthechannel1 AC-GND-DC control. Serves astheY axis
orY axis input selector during X-Yoperation.
©CH2INPUT
Vertical axis input jackforchannel2. Serves astheX axis orY axis input jack during
X-Y operation.
@VorY MODE
This switchselectsthevertical axis operationmodeand serves astheY axis selection
switch during X-Yoperation.
CH1: Channel1 input signalisdisplayedonthe CRT. Channel1 istheY axis ifthis
modeisselected during X-Yoperation.
CH2: Channel2 input signalisdisplayedonthe CRT. Channel2 istheY axis ifthis
modeisselected during X-Yoperation.
ALT: Channel1 andchannel2 signalsaredisplayedalternatelyontheCRT with
each sweep.
CHOP: Channel1 and2 signalsaredisplayedalternatelyontheCRTata repetition
rateof50kHzormore.
ADD:Thealgebraicsumofthechannel1 and2 signalisdisplayedonthe CRT. If
CH2 INV© isengaged,thedifferenceisdisplayedontheCRT.
Note:
TheALT,CHOP,andADDmodescannotbeusedduringX-Yoperation.
©CH2INV
Invertsthe polarity ofthechannel2 signal.
©TRIGorX1 CHI/ _m. CH2
This button selectsthe trigger sourcewhenaninternal trigger (INT)isselected. Serves
as theX axis selectionswitch during X-Yoperation.
CH1: Channel1 input signal serves asthe trigger source.Channel1 becomesthe
X axis ifthis button ispressed during X-Yoperation.
CH2: Channel2 input signal serves asthe trigger source.Channel2 becomesthe
X axis ifthis button ispressed during X-Yoperation.
11

Fig. 2-3
© INTENSITY
Adjuststhebrightnessofthetrace.
@ LEVEL/PULL SLOPE (-)
LEVEL: Triggerleveladjustmentcontrol.Determines point on trigger signalwave-
form wheresweepstarts.
SLOPE: Trigger polarity selector.Pullingtheknobtriggersthesweepatthefalling
slopeofthe input waveform.
<§)AUTO/NORM(TRIGMODE)
Knobforselectingthe triggering mode.
AUTO: Triggeredsweepoperationwhen trigger signalispresent,automatically
generatessweep(freerun)inabsenceof trigger signal.
NORM:Normal triggered sweepoperation.Unlike AUTO, nosweepappearswhen
theproper trigger signalisnotapplied.
©© NORM/LINE(TRIG SOURCE)
Select the trigger source (sync signalsource).The following trigger sourcescanbe
selected.
WhenNORMisselected with theswitch @>, switch@ selectseitherinternal triggering
( _•_INT)orexternal triggering (EXT).
INT:Internal triggering isselectedandthesweepis triggered bythesignal input
forthevertical axis. Eitherthechannel1 orchannel2 signalcanbeselect-
edasthe trigger sourceusing TRIG orX ©.
EXT: The trigger sourceisthesignalappliedtotheEXT. TRIG jack@.
When LINE isselected with switch(§):
LINE: Thesweepis triggered bythelinepowerfrequency.
12

® (23) TRIG COUPLING
Select thecouplingmethodusedforthetrigger signal.
When NORMisselectedwithswitch@,eitherACcoupling( JI_ AC)orDCcoupling
( _M_ DC)canbeselectedwithswitch(§).
AC: TriggersignalisACcoupledtothe sync circuit. Blocks DCcomponentofinput
signal. Mostcommonlyusedpositionforwaveformobservation.
DC: TriggersignalisDCcoupledtothe sync circuit. Sweep istriggerbysignalin-
cludingDCcomponent.
When TV(JL) isselectedwithswitch (22), vertical sync (_•_)orhorizontal sync (J*.)
is selectedbyswitch (23).
V: Sweep istriggeredbyvertical sync pulses ofvideo signal.
H: Sweep istriggeredbyhorizontal sync pulses ofvideo signal.
® SWEEP VARIABLE
Provides fineadjustmentofsweeptime;continuousadjustmentispossiblebetween
steps selectedby SWEEP TIME/DIV ©. Sweep timeiscalibratedbyintheextremeclock-
wise (CAL)position.
(25) SWEEP TIME/DIV
Sweep time coarse selector. Selects sweeptimesbetween0.2/ts/divand1 s/divin
21 steps. Indicated values arecalibratedwhen SWEEP VARIABLE ® controlissetto
CAL position(fully clockwise). OscilloscopeissettoX-Yoperatingmodewhenthis
knobisrotatedtofullycounterclockwise(X-Y)position.InX-Yoperation,sweeping
stops andthesourceselectedby TRIG orX © becomestheX axis amplifierandthe
source selectedbyV orY MODE ® becomestheY axis amplifier.
© % POSITION/PULL x 5 MAG
Rotationadjuststhehorizontalpositionofthetraceonthedisplay.Pullingthisknob
increases thesweeptimefivetimes.The SWEEP TIME/DIV valueis 1 /5oftheindicat-
ed valueatthistime.
13

Rear Panel
Fig. 3
@ GNDTerminal
Chassis groundterminalusedforestablishinga commongroundwithotherequipment.
<§) EXT. TRIG Jack
Inputterminalforexternaltrigger signal. Whenthe TRIG SOURCE @> controlissetto
NORM and© issetto EXT, thesignalinputtothisterminalbecomesthetrigger signal.
(§) Fuse Holder
Contains theline fuse. Verifythattheproperfuseisinstalledwhenreplacingtheline fuse.
100 V to120V 0.5A
200 V to240V 0.3A
14

BOTTOM PANEL
Fig. 4
(§) TRACE ROTATION
Electrically rotatestracetohorizontalposition,
Adjustwhenstrongmagneticfields cause thetracetobetilted.
© FOCUS
Adjusts thetracefor optimum focus.
15

OPERATION
INITIALSTARTING PROCEDURE
Untilyoufamiliarizeyourself with theuseofallcontrols,the following proceduremay
beusedtostandarizethe initial settingofcontrolsasa reference point andto obtain trace
ontheCRTinpreparationforwaveformobservation.
Whenusingtheprobe(s),refertoprobe'sinstructionsand "PROBE COMPENSATION"
listedin APPLICATION ofthismanual.
[1]NORMAL SWEEP DISPLAY OPERATION
1. Push the POWER switch© — thepowersupply will beturnedonandthe pilot lamp
will light.
Set thesemodesasfollows;
V orY MODE@:CH1
TRIG MODE®:AUTO
2. Thetrace will appearinthecenteroftheCRTdisplayandcanbeadjustedbytheCH1
^ POSITION © and^ • POSITION © controls.Next,adjustthe INTENSITY @ and,
if necessary, the FOCUS (fj)for ease ofobservation.
3. VerticalModes
Applyan input signaltotheCH1 INPUT ® jackandadjustthe VOLTS/DIV © control
fora suitable size displayofthewaveform.Ifthewaveformdoesnotappearinthe
display,adjustthe VOLTS/DIV andy POSITION controlsto bring thewaveform into
thecenter portion oftheCRTdisplay.Operation with a signalappliedtotheCH2IN-
PUT (J3) jackandtheV orY MODEsettoCH2issimilartotheaboveprocedure.
IntheADDmode,thealgebraicsumofCH1+ CH2isdisplayed.IftheCH2INV© switch
has beenengaged,thealgebraicdifferenceofthetwowaveforms,CH1— CH2isdis-
played. If both channelsaresettothesame VOLTS/DIV, thesumordifferencecan
bereaddirectlyin VOLTS/DIV from the CRT. IntheALTmode,onesweepdisplayes
thechannel1 signalandthenextsweepdisplaysthechannel2 signalinanalternating
sequence.
16
Fig. 5

Inthe CHOP mode,thesweepischoppedatanapproximate50kHzrateandswitched
betweenCH1andCH2. Note that inthe CHOP modeofoperation,the trigger source
becomesthechoppingsignalitself,makingwaveformobservationimpossible.UseALT
modeinsteadinsuch cases, orselecta trigger SOURCE ofCH1orCH2.
Ifnotraceisobtainable,refertothe following TRIGGERING procedures.
4. Aftersettingthe SOURCE switch,adjustthe SLOPE control.
The displayonthescreen will probablybeunsynchronized.Referto TRIGGERING proce-
durebelowforadjustingsynchronizationandsweepspeedto obtain a stabledisplay
showingthedesirednumberofwaveform.
TRIGGERING
The input signalmustbeproperly triggered forstablewaveformobservation. TRIGGER-
ING ispossiblethe input signalINTernallytocreatea trigger or with an EXTernally provid-
edsignalof timing relationshiptotheobservedsignal,appliyingsucha signaltotheEXT
TRIG INPUTjack.
The SOURCE switchselectsthe input signal that istobeusedto trigger thesweep, with
INT syncpossibilities(CH1,CH2, LINE) andEXTsyncpossibility.
*Internal Sync
Whenthe SOURCE selectionisinNORMandINT(CH1orCH2),the input signaliscon-
nectedtotheinternal trigger circuit.Inthisposition,a partofthe input signalfedtothe
INPUT ® or© jackisapplied from theverticalamplifiertothe trigger circuittocause
the trigger signal triggered with the input signaltodrivethesweep.
WhentheV orY MODEselectionisinALT,theALT position isveryconvenientformeas-
uringthe time duration ofthewaveform.However,forphaseor timing comparisonsbe-
tweenthechannel1 andchannel2 waveforms, both tracesmustbe triggered bythesame
sync signal.
Whenthe SOURCE selectionisinNORMandINT (CH1), the input signalatthechannel
1 INPUT(8)jackbecomes trigger regardlessofthe position ofV orY MODE.Whenthe
SOURCE selectionisinNORMandINT (CH2), the input signalatthechannel2 INPUT
©jackbecomes trigger regardlessofthe position ofV orY MODE.Whenthe SOURCE
selectionin LINE, theAClinevoltagepoweringtheoscilloscopeisusedassynctriggering.
*External Sync
Whenthe SOURCE selectionisinNORMand EXT, the input signalatthe EXT TRIG INPUT
©jackbecomesthe trigger. Thissignalmusthavea time orfrequencyrelationshipto
thesignalbeingobservedtosynchronizethedisplay.Externalsyncispreferedforwave-
form observationinmanyapplications.Forexample,Fig.6 shows that thesweepcircuit
is drivenbythegatesignalwhenthegatesignalintheburstsignalisappliedtotheEXT
TRIG INPUTjack.Fig.6 alsoshowsthe input/output signals,wheretheburstsignalgener-
ated from thesignalisappliedtotheinstrumentundertest. Thus, accurate triggering can
beachieved without regardtothe input signalfedtotheINPUT(8)or@ jackso that no
further triggering isrequiredevenwhenthe input signalisvaried.
17

Trigger signal
(Gate signal)
• CH1(Inputsignalto
amplifier,etc.)
CH2 (Outputsignal
fromamplifier,etc.)
* Triggering Level
Trigger pointonwaveformisadjustedbythe LEVEL/PULLSLOPE ® control.Fig.7 shows
therelationshipbetweenthe SLOPE and LEVEL ofthetriggerpoint.Triggeringlevelcan
be adjustedas necessary.
SLOPE "-" RANCE
LEVEL
* AutoTrigger
When the TRIG MODE(jj)selectionisin AUTO, thesweepcircuitbecomesfree-running
as longasthereisnotrigger signal, permittinga checkofGND level. Whena trigger sig-
nal ispresent,thetriggerpointcanbedeterminedbythe LEVEL controlforobservation
as inthenormaltrigger signal. Whenthetriggerlevel exceeds the limit, thetriggercircuit
also becomesfree-runningwherethewaveformstartsrunning.Whenthe LEVEL control
is pushedinand/or,whenthetriggersignalisabsentorthetriggeringlevel exceeds the
limit, thereisno sweep.
18
Fig. 6
SLOPE " + " RANGE
Fig. 7

[2]MAGNIFIED SWEEP OPERATION
Sfnce merelyshorteningthesweeptimetomagnifya portion ofanobservedwaveform
can resultinthedesired portion disappearingoffthe screen, suchmagnifieddisplayshould
beperformedusingthe MAGNIFIED SWEEP.
Using the POSITION control,adjustthedesired portion ofwaveformtothe CRT. Pull
outthe PULL x 5 MAGcontroltomagnifythedisplay5 times.Forthistypeofdisplaythe
sweep timeisthe SWEEP TIME/DIV settingdividedby5.
[3]X-YOPERATION
For somemeasurements,anexternalhorizontaldeflectionsignalisrequired. This isalso
referredtoasanX-Ymeasurement,wheretheY input providesverticaldeflectionand
X input provideshorizontaldeflection.
X-Y operationpermitstheoscilloscopetoperformmanytypesofmeasurementsnotpos-
sible with conventionalsweepoperation.TheCRTdisplaybecomesanelectronicgraph
oftwoinstantaneousvoltages.Thedisplaymaybea directcamparisonoftwovoltages
such asduringphasemeasurement,frequencymeasurement with Lissajous waveforms.
To useanexternalhorizontal input, usethe following procedure;
1. Setthe SWEEP TIME/DIV controltotheX-Yposition.
2. Usethechannel1 probeforthevertical input andthechannel2 probeforthehorizon-
tal input.
3. Adjusttheamountofhorizontaldeflection with theCH2 VOLTS/DIV and VARIABLE
controls.
4. TheCH2(vertical) POSITION (§)controlnow serves asthehorizontalpositioncontrol,
andthe^ POSITION controlisdisabled.
5. All sync controlsaredisconnectedandhavenoeffect.
[4]VIDEOSIGNALOBSERVATION
The TV-V/H switchpermitsselectionofverticalorhorizontal sync pulseforsweeptrig-
geringwhenviewingcompositevideowaveforms.IntheTV-Hposition,horizontal sync
pulses areselectedastriggerstopermitviewingofhorizontallineofvideo. This isalso
thepositionusedforviewingallnon-videowaveforms.IntheTV-Vposition,vertical sync
pulses areselectedastriggerstopermitviewingofverticalfieldsandframesofvideo.
Whenobservingthevideowaveforms,stabledisplayisobtainedonthescreenregardless
the TRIGLEVEL @ control.
Atmostpointsofmeasurement,a compositevideosignalisofthepolarity,thatis,the
sync pulsesarenegativeandthevideoispositive.Inthis case, use"-" SLOPE.
Ifthewaveformistakenata circuit point wherethevideowaveformisinverted,the sync
pulses arepositiveandthevideoisnegative.Inthis case, use" + " SLOPE.
19

APPLICATION
PROBE COMPENSATION
To obtain anaccuratemeasurementresult,theprobemustbeadjustedcorrectlybefore
measurement.
1. ConnecttheprobetotheINPUTterminalandsetthe control fora normalsweepdisplay.
2. ConnecttheprobetotheCALterminalonthe front panel,andadjustthe SWEEP
TIME/DIV control todisplaya fewcyclesofthesignal output from it.
3. Adjustthetrimmerontheprobeto obtain the following correctcompensationwaveform.
Correct
compensation
Over
compensation
Insufficient
compensation
Fig. 8
TRACE ROTATIONCOMPENSATION
Rotation from a horizontaltrace position canbethecauseofmeasurementerrors.
Adjustthecontrolsfora singledisplay.Setthe AC-GND-DC switchtoGNDand TRIG MODE
to AUTO. Adjustthey POSITION control such that thetraceisoverthecenterhorizon-
talgraticuleline.Ifthetraceappearstobe rotated from horizontal,alignit with thecenter
graticulelineusingthe TRACE ROTATION control locatedonthe front panel.
DC VOLTAGE MEASUREMENTS
This proceduredescribesthemeasurementprocedureforDCwaveforms.
Procedure:
1. Connectthesignaltobemeasuredtothe INPUT jack.SettheV orY MODEtothechannel
tobeused.Setthe VOLTS/DIV and SWEEP TIME/DIVswitchto obtain a normaldis-
playofthewaveformtobemeasured.Setthe VARIABLE control totheCALposition.
20