Kenwood CS-3035 User manual

20MHz COMPACTOSCILLOSCOPE
CS-3035
INSTRUCTIONMANUAL
KENWOOD CORPORATION
©PRINTEDINJAPANB50-7681-00(T)
90/1211109 8 7 6 5 4 3 2 1 89/12 11 109 8 7 6
KENWOOD

SAFETY
Symbol in This Manual
fi\ This symbolindicateswhereapplicablecautionaryorotherimformationistobefound.
Power Source
This equipmentoperates from a powersourcethatdoesnotapplymorethan250V rms
betweenthesupplyconductorsorbetweeneithersupplyconductorandground.A pro-
tectivegroundconnectionbywayofthegroundingconductorinthepowercordis essen-
tialfor safe operation.
Grounding theProduct
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.
DonotOperatein Explosive Atmospheres
To avoidexplosion,donotoperatethisproductinanexplosiveatmosphere.
DonotRemoveCoverorPanel
To avoidpersonalinjury,donotremovethecoverorpanel. Refer servicingtoqualified
personnel.
VoltageConversion
Ifthepower source isnotappliedtoyourproduct,contactyourdealer.Toavoidelectrical
shock, donotperformthevoltageconversion.
2

CONTENTS
SAFETY 2
OVERVIEW ANDCONFIGURATION4
SPECIFICATIONS 5
/j^ PREPARATIONFORUSE7
CONTROLSANDINDICATORS9
FRONTPANEL9
SIDE PANEL;13
REAR PANEL14
TOP CASE SURFACE 15
OPERATION: 16
INSTALSTARTINGPROCEDURE16
[1] NORMAL SWEEP DISPLAYOPERATION16
[2]MAGNIFIED SWEEP OPERATION19
[3]X-YOPERATION19
APPLICATION20
PROBE COMPENSATION20
TRACE ROTATIONCOMPENSATION20
DCVOLTAGEMEASUREMENTS20
MEASUREMENTOFTHEVOLTAGEBETWEENTWOPOINTSONA WAVEFORM21
ELIMINATION OFUNDESIREDSIGNALCOMPONENTS22
TIMEMEASUREMENTS23
FREQUENCY MEASUREMENTS ....24
APPLICATIONOFX-YOPERATION25
MAINTENANCE27
/j\ MAINTENANCE27
3

OVERVIEW ANDCONFIGURATION
Overview
This unit isa compact,light-weight,highperformanceportableoscilloscopeequipped with
rectangular CRT with internalgraticule.
The frequencybandwidthof20MHzandselectablesweeptimeof0.2/is/divto1 s/div
forthevertical axis allowsusefora widerangeofapplications.Itisalsoequipped with
magnificationfunctionsfortheverticalandhorizontal axis, HFREJ functionallowing sta-
ble triggering with highfrequencycomponentsblocks,andoptionalDCpowersupplyfor
fielduse. These featuresmakeittheidealoscilloscopeforon-siteservicingandmain-
tenance.
Configuration
The following itemsare containedinthepacking case. Whenunpacking,makesurethat
all itemshavebeenincluded.
Oscilloscope 1 pc.
Probe (PC-30) 2 pes.
Panel cover1 pc.
Instructionmanual1 pc.
Replacement fuse0.3A 2 pes.
0.5 A 2 pes.
Inaddition,the following arealsoavailableasoptional accessories (soldseparately).
DC powersupply (BP-70)
Carrying case (soft)MC-81
Carrying case (hard)MC-82
Carrying case (hard)MC-83(forusewhenDCpowersupplyisattached)
4

SPECIFICATIONS
CRT
Type RectangularhighluminanceCRT(withinternal
graticule)
Acceleration VoltageApprox.1.8kV
Display Area 8x10divflat-face(1div= 6.35mm)
VERTICAL AXIS
OperatingModes CH1, CH2,ALT, CHOP, ADD
Sensitivity 5 mV/divto5 V/div,+1-3%
Sensitivity Magnification...5times+/-5%(x5MAGused)
Attenuator1-2-5stepsequence,10ranges,adjustablebetween
ranges
Frequency Response
5 mV/divto5 V/div...DC: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
AMaximumInputVoltage800Vp-por400V (DC + AC peak)
HORIZONTAL AXIS
OperatingModesX-Yoperationselectable with sweepknob
CH1:Xaxis CH2:Y axis
Sensitivity Same asvertical axis (CH1)
InputImpedance Same asvertical axis (CH1)
Frequency Response DC:DCto200kHz,-3dB
AC: 5 Hzto200kHz,-3dB
X-Y Phase Difference3°or less at10kHz
/^MaximumInputVoltage Same asvertical axis (CH1)
5

SWEEP
Sweep TypeNORM: Triggering sweep
AUTO: Sweepfreerunsinabsenceof trigger
SINGLE: Singlesweep
Sweep Time0.2/xs/d'w to1 s/div+/-3%in21ranges,1-2-5se-
quence,adjustablebetweenranges
Sweep Magnification 5 times+/-5%(x5MAGused)
TRIGGERING
Internal Sync INT, LINE
External Sync EXT
External Sync Input
Impedance1 Mohm, 40pFor less
^ Maximum ExternalTrigger
Input Voltage 50V (DC+ ACpeak)
Sync Coupling AC, HFREJ, DC
Polarity+/-
TriggerSensitivity Coupling Frequency
Amplitude (Voltage)
Coupling Frequency INT
EXT
DC DC~2MHz
-20MHz 0.5div
1div 0.1Vp-p 0.2Vp-p
HFREJ
Attenuation at more than 1.5kHz
AC
10Hz~2MHz
-20MHz 0.5div
1div 0.1Vp-p. 0.2Vp-p
AUTO:Sameasabovespecificationforabove50Hz.
CALIBRATIONVOLTAGESquarewave(positive polarity)
0.25Vp-p±2%,1 kHz±2%
POWERREQUIREMENTS
PowerSupply Voltage AC 100/120/220/240V ±10%216V-250V 50/60Hz
Power Consumption Approx. 22W (at100V AC)
DIMENSIONSANDWEIGHT
Dimensions216 (width) x 89(height)x 298(depth)mm
Weight Approx. 4 kg
OPERATINGTEMPERATUREAND HUMIDITY FORGUARANTEEDSPECIFICATIONS
5 to35°C,85%maximumRH
ACCESSORIES Probe (PC-30) 2 pes.
Panel Cover1 pc.
Instruction Manual1 pc.
PowerCord1 pc.
Fuse (0.5A)2 pes.
(0.3 A)2 pes.
6

PREPARATION FORUSE
SAFETY
Before connectingtheinstrumenttoa powersource,carefullyreadthe following infor-
mation,thenverifythattheproperpowercordisusedandtheproperlinefuseisinstalled
forpower source. Thespecifiedvoltageisshownatthe left sideofthepowercordon
therearpanel.Ifthepowercordisnotappliedforspecifiedvoltage,thereis always a
certain amountofdanger from electricshock.
Line voltage
This instrumentoperatesusingAC-power input voltagesthat 100/120/220/240 V 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 optionalpowercordsare shownasfollowsinFig.1.
Line fuse
The fuseholderislocatedontherearpanelandcontainstheline fuse. Verifythatthe
properfuseisinstalledbyreplacingtheline fuse.
EQUIPMENT PROTECTION
1. Neverallowa smallspotofhighbrilliancetoremainstationaryonthe screen formore
thana few seconds. The screen maybecomepermanentlyburned.A spotwilloccur
onlywhenthescopeissetupfor X-Y operationandnosignalisapplied.Eitherreduce
theintensitysothespotisbarely visible, 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 use theprobegroundclipsforbest results. Donotuseanexternalgroundwire
inlieuoftheprobegroundclips,asundesiredsignalsmaybeintroduced.
7

6. OperationadjacenttoequipmentwhichproducesstrongACmagneticfieldsshouldbe
avoidedwherepossible.
This includessuch devices aslargepower supplies, transformers,electricmotors,etc.,
thatare often found inanindustrialenvironment.Strongmagneticshieldscanexceed
thepractical CRT magneticshieldinglimitsandresultinterferenceanddistortion.
7. Probecompensationadjustmentmatchestheprobetothe input ofthe scope. Forbest
results, compensationofprobeshouldbeadjustedinitially,thenthesameprobeal-
ways used with the input of scope. Probecompensationshouldbereadjustedwhenever
a probe from a differentscopeis used. (Seepage20)
8. In X-Y operation,donot pull outthe PULLx 5 MAGswitch.Ifpulledoutit,noisemay
appeare onthewaveform.
Plug configuration
Power cord
and plugtype
Factory installed
instrumentfuse
Line cordplugfuse
North American
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
5x20mm
None
U.K.
240volt/50Hz
Rated 13amp
0.3A,250V
Fast blow
6x30mm
0.3A
Type C
Australian
240volt/50Hz
Rated 10amp
0.3A,250V
Fast blow
6x30mm
None
North American
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
6x30mm
None
Fig. 1 PowerInputVoltageConfiguration
8

© POWER
Power switchfortheoscilloscope. Pressing this control onceturnsthepoweronand
pressing itagainturnsthepoweroff.
(DPilotLamp
Lamp lightswhentheoscilloscopeison.
(3) CALTerminal
Voltageterminalforcalibrationofprobes.Providesanapproximately 1 kHzsquarewave
at0.25V with positivepolarity.
D$ POSITION/PULL x 5 MAG
Rotationadjuststhevertical position ofchannel 1traceonthedisplay.Pullingthisknob
increases thevertical axis sensitivity5 times.
© VOLTS/DIV
Sets thevertical axis sensitivityusingtheverticalattenuatorforchannel1. This knob
can beswitchedina 1-2-5 sequence. Settingthe VARIABLE knob (6) totheCALposi-
tion providescalibratedvertical axis sensitivity.
DuringX-Yoperation,this control serves astheattenuatorfortheX axis.
© VARI (ABLE)
Rotationprovidesfine control ofchannel1verticalattenuation.Allowscontinuousad-
justmentbetween VOLTS/DIV ranges.Inthe fully clockwise (CAL) position,theverti-
cal attenuatoriscalibrated.DuringX-Yoperation,this control serves astheX axis
attenuatorfineadjustment.
9
CONTROLS ANDINDICATORS
FRONT PANEL
Fig. 2-1

(7) AC-GND-DC
This leverselectsthecoupling method usedfortheCH1vertical axis input signal.
AC: Input signalisACcoupled,andDCcomponentisblocked.
GND: Input signalandverticalamplifierareseparatedand input toverticalamplifier
is grounded.Thisallowsforconfirmationofthe ground potential.
DC: Input signalisDCcoupledallowingformeasurementincludingDCcomponent.
This leverserversastheX axis input selector during X-Yoperation.
®CH1 or[x|INPUT
Vertical axis input jackforchannel1. Serves astheX axis input jack during X-Y
operation.
(9) 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 astheY axis attenuation
fineadjustment control during X-Yoperation.
©AC-GND-DC
This lever selects thecoupling method usedforthechannel2 vertical axis input signal.
Performsthesame function as thechannel1 AC-GND-DC control. Serves as theY axis
input selector during X-Yoperation.
© CH2 or[Y]INPUT
Vertical axis input jackforchannel2. Serves astheY axis input jack during X-Y
operation.
10
Fig. 2-2

©CH2INV
Invertsthe polarity ofthechannel2 signal.
©$ POSITION/PULLx 5 MAG
Performsthesame function forchannel2 asthechannel1 y POSITION control. Serves
as theY position adjustment control during X-Yoperation.
©MODE
This switchselectsthevertical axis operationmode.
CH1: Channel1 input signalisdisplayedontheCRT.
CH2: Channel2 input signalisdisplayedontheCRT.
ALT: Channel1 andchannel2 signalsare displayedalternatelyonthe CRT with
each sweep.
CHOP: Channel1 and2 signalsare displayedalternatelyonthe CRT ata repetition
rateof50kHzormore.
ADD:Thealgebraicsumofthechannel1 and2 signalisdisplayedonthe CRT. If
CH2 INV® isengaged,thedifferenceisdisplayedontheCRT.
Note: •
TheALT,CHOP,andADDmodescannotbeusedduringX-Yoperation.
© TRACE ROTATION
Electrically rotatestracetohorizontalposition.
Adjustwhenstrongmagneticfieldscausethetracetobe tilted.
© FOCUS
Adjuststhetracefor optimum focus.
@ INTENSITY
Adjuststhebrightnessofthetrace.
© LEVEL/PULL SLOPE (-)
LEVEL: Triggerleveladjustmentcontrol.Determines point on trigger signalwaveform
wheresweepstarts.
SLOPE: Trigger polarity selector.Pullingtheknobtriggersthesweepatthefallingslope
ofthe input waveform.
©TRIGJL CH1 / CH2 (TRIGswitch)
This button selectsthe trigger sourcewhenaninternal trigger (INTselectedby TRIG
SOURCE ©)isselected.
CH1: Channel1 input signal serves asthe trigger source.
CH2: Channel2 input signal serves asthe trigger source.
11

© TRIGGERING MODE (TRIG MODE)
Knobforselectingthe triggering mode.
AUTO: Triggeredsweepoperationwhen trigger signalispresent,automaticallygener-
ates sweep(freerun)inabsenceof trigger signal.
NORM: Normal triggered sweepoperation.Unlike AUTO, nosweepappearswhenthe
proper trigger signalisnotapplied.
SINGLE/PUSH RESET:
Pressing thisknob selects thesinglesweepmode.Thesweepisresetbypress-
ingagain,andisresetevery time itissubsequentlypressed.Whenthereis
no trigger signal,the READY lampisilluminatedandthereisa singlesweep
atthenext trigger signal.
(22) READY (LED)
Whenthe SINGLE (RESET) knob© ispressedinthe SINGLE (singlesweep)mode,this
LED lightsupandtheoscilloscopewaitsforthenext trigger signal.The LED goesout
attheendofthesweep.
@ SWEEP VARIABLE
Provides fineadjustmentofsweeptime;continuousadjustmentispossiblebetween
steps selectedby SWEEP TIME/DIV @. Sweep time iscalibratedbyintheextremeclock-
wise (CAL)position.
(24) SWEEP TIME/DIV
Sweep time coarseselector.Selectssweeptimesbetween0.2/ts/divand1 s/divin
21 steps.Indicatedvaluesarecalibratedwhen SWEEP VARIABLE (23) control issetto
CAL position (fullyclockwise).OscilloscopeissettoX-Yoperatingmodewhenthis
knobis rotated to fully counterclockwise(X-Y)position.InX-Yoperation,sweeping
stopsandthechannel1 becomesX axis amplifierandthechannel2 becomesY axis
amplifier.
©•<• POSITION/PULL x 5 MAG
Rotationadjuststhehorizontal position ofthetraceonthedisplay.Pullingthisknoh
increases thesweep time fivetimes.The SWEEP TIME/DIV valueis1/5oftheindicat-
edvalueatthistime. Serves astheX position adjustment control during X-Y operation.
12

SIDE PANEL
@ GNDTerminal
Chassis ground terminalusedforestablishinga common ground with otherequipment.
@ EXT.TRIG Jack
Input terminalforexternal trigger signal.Whenthe TRIG SOURCE (§) control issetto
NORMand© issetto EXT, thesignal input tothisterminalbecomesthe trigger signal.
(28) SOURCE (TRIG SOURCE)
Selects the trigger source (sync signalsource).The following trigger sourcescanbe
selected.
INT:Internal triggering isselectedandthesweepis triggered bythesignal input for
thevertical axis. Eitherthechannel1 orchannel2 signalcanbeselectedasthe
trigger sourceusingthe TRIG switch (20).
LINE: Thesweepis triggered bythelinepowerfrequency.
EXT: The trigger sourceisthesignalappliedtothe EXT. TRIG Jack @.
®COUPLING
Selects thecoupling method usedforthe trigger signal.
AC: TriggersignalisACcoupledtothesynccircuit.BlocksDCcomponentof input
signal. Mostcommonlyused position forwaveformobservation.
HFREJ: Triggersignal passes through a low pass filter beforecouplingtothesynccir-
cuit.Highfrequencycomponentsaboveabout1 kHzare attenuatedallowing
forstable triggering bythelowfrequencycomponents.
DC: TriggersignalisDCcoupledtothesynccircuit.Sweepis triggered bysignal
includingDCcomponent.
13
Fig. 3

REAR PANEL
(§) Fuse Holder
Contains theline fuse. Verify that theproper glass fuseisinstalledwhenreplacingthe
line fuse.
100 V to120V 0.5A
200 V to240V 0.3A
©PowerConnector
This istheconnectorforapplyingACpower.UsethesuppliedACcord.
14
Fig. 4

TOP CASE SURFACE
(§)ConnectorCover
Used when option BP-70 (DCpowersupply)isused;Thiscoverprotectstheconnec-
torforsupplyingpower.Loosenthescrewsonthe front panel,removetherearpanel
screws, rotate 180degrees,and tighten thescrewsagainto hold thecoverinplace.
Damagetothe unit isliabletooccurifused with thecoverremoved.Whenthe option-
al powersupplyisinuse,attachthecoverto protect theconnectors.
(33) ScrewHoleforOptionAttachment
Screw holeusedtoattach optional BP-70 unit tothisoscilloscope.
15
Fig. 5

OPERATION
(1)NORMAL SWEEP DISPLAY OPERATION
1. Push the POWER switch© — thepowersupply will beturnedonandthe pilot lamp
will light.
Set thesemodesasfollows;
MODE©:CH1
TRIG MODE©: AUTO
SOURCE (§):INT
COUPLING ©:AC
2. Thetrace will appearinthecenterofthe CRT displayandcanbeadjustedbytheCH1
$ POSITION 0 and• POSITION © controls.Next,adjustthe INTENSITY @ and,
if necessary, the FOCUS @ for ease ofobservation.
3. VerticalModes
With verticalMODE® setto CH1, and TRIG ® switchsetto CH1, applyan input sig-
naltotheCH1INPUT®jackandadjustthe VOLTS/DIV © control fora suitable size
displayofthewaveform.Ifthewaveformdoesnotappearinthedisplay,adjustthe
VOLTS/DIV and$ POSITION controlsto bring thewaveform into thecenter portion
ofthe CRT display.Operation with a signalappliedtotheCH2 INPUT @ jackandthe
verticalMODEsettoCH2issimilartotheaboveprocedure.
IntheADDmode,thealgebraicsumof CH1 + CH2 isdisplayed.IftheCH2INV®switch
has beenengaged,thealgebraicdifferenceofthetwowaveforms, CH1 — CH2isdis-
played. If both channelsare settothesame VOLTS/DIV, thesumordifferencecan
bereaddirectlyin VOLTS/DIV from the CRT. IntheALTmode,onesweepdisplayes
thechannel1 signalandthenextsweepdisplaysthechannel2 signalinanalternating
sequence.
16
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.
Fig. 6

Inthe CHOP mode,thesweepischoppedatanapproximate50kHzrateandswitched
betweenCH1andCH2. Note that inthe CHOP modeofoperation with the SOURCE
switchsettoINT, TRIG © switchsetto CH1 or CH2, the trigger sourcebecomesthe
choppingsignalitself,makingwaveformobservationimpossible.UseALTmodein-
stead insuch cases, orselecta trigger SOURCE ofCH1orCH2.
Ifnotraceisobtainable,refertothe following TRIGGERING procedures.
4. Aftersettingthe SOURCE switch,adjustthe SLOPE control.
The displayonthe screen 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.
TheSOURCE switchselectsthe input signal that istobeusedto trigger thesweep, with
INT syncpossibilities (CH1, CH2, LINE) andEXTsyncpossibility.
*Internal Sync
Whenthe SOURCE selectionisinINT (CH1, CH2, LINE), the input signalisconnected
totheinternal trigger circuit.Inthisposition,a partofthe input signalfedtotheINPUT
(8) or (12) jackisapplied from theverticalamplifiertothe trigger circuitto cause the trigger
signal triggered with the input signaltodrivethesweep.
WhentheverticalMODEselectionisin ALT, theALT position isveryconvenientformeas-
uringthe time duration ofthewaveform.However,forphaseor timing comparisonsbe-
tweenthechannel1andchannel2 waveforms, both tracesmustbe triggered bythesame
sync signal.
Whenthe SOURCE selectionisinINT TRIG@) switchsetto CH1, the input signalatthe
channel 1 INPUT (§) jackbecomes trigger regardlessofthe position ofvertical MODE. When
the SOURCE selectionisinINT, TRIG ® switchsettoCH2,the input signalatthechan-
nel2 INPUT @ jackbecomes trigger regardlessofthe position ofverticalMODE.When
the SOURCE selectionin LINE, theaclinevoltagepoweringtheoscilloscopeisusedas
sync triggering.
*External Sync
Whenthe SOURCE selectionisin EXT, the input signalatthe EXTTRIG INPUT@ jack
becomesthe trigger. Thissignalmusthavea time orfrequencyrelationshiptothesignal
beingobservedtosynchronizethedisplay.Externalsyncispreferedforwaveformobser-
vationinmanyapplications.Forexample,Fig.7 shows that thesweepcircuitisdriven
bythegatesignalwhenthegate signalintheburstsignalisappliedtothe EXTTRIG IN-
PUT jack.Fig.7 alsoshowsthe input/output signals,wheretheburstsignalgenerated
from thesignalisappliedtotheinstrumentundertest. Thus, accurate triggering canbe
achieved without regardtothe input signalfedtothe INPUT ® or@ jackso that no fur-
ther triggering isrequiredevenwhenthe input signalisvaried.
17

Trigger signal
(Gate signal)
CH1 (Inputsignalto
amplifier,etc.)
CH2 (Outputsignal
fromamplifier,etc.)
Fig. 7
* Triggering Level
Trigger pointonwaveformisadjustedbythe LEVEL/PULLSLOPE @ control. Fig. 8shows
therelationshipbetweenthe SLOPE and LEVEL ofthetriggerpoint.Triggeringlevelcan
be adjustedas necessary.
* AutoTrigger
When the TRIG MODE @ 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.
SLOPE "-" RANGE
Fig. 8
18
SLOPE " + " RANGE
LEVEL

(2)MAGNIFIED SWEEP OPERATION
Since 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.The CRT displaybecomesanelectronicgraph
oftwoinstantaneousvoltages.Thedisplaymaybea directcamparisonoftwovoltages
such asduringphasemeasurement,frequencymeasurement with Lissajous waveforms.
To useanexternalhorizontal input, usethe following procedure;
1. Setthe SWEEP TIME/DIV controltotheX-Yposition.
2.Use thechannel1 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 controlsare disconnectedandhavenoeffect.
19

APPLICATION
PROBE COMPENSATION
To obtain anaccuratemeasurementresult,theprobemustbeadjustedcorrectlybefore
measurement.
1. Connecttheprobetothe INPUT terminalandsetthe 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
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 VOLTAGEMEASUREMENTS
This proceduredescribesthemeasurementprocedureforDCwaveforms.
Procedure:
1. ConnectthesignaltobemeasuredtotheINPUTjack.SettheverticalMODEtothe
channeltobeused.Setthe VOLTS/DIV and SWEEP TIME/DIV switchto obtain a nor-
maldisplayofthewaveformtobemeasured.Setthe VARIABLE control totheCAL
position.
2. Setthe TRIG MODEtoAUTOand AC-GND-DC totheGNDposition,whichestablished
thezero volt reference.Usingthey POSITION control,adjustthetrace position tothe
desiredreferencelevelposition,makingsurenottodisturbthissettingoncemade.
20
Over
compensation
Insufficient
compensation
Fig. 9