Kenwood CS-1352 User manual

TRIGGEREDSWEEPOSCILLOSCOPE
INSTRUCTION MANUAL
CS-1352
DUAL TRACEOSCILLOSCOPE

FEATURES
*Vertical axis provideshighsensitivityandwide
bandwidth,2 mV/div,15MHz(-3dB).
*OperatesonAC,internalDCandexternalDC,
each beingselectedautomatically without using
powerselectorswitch.
*TheadoptionofIC's throughout circuitry assures
highperformanceandimprovedreliability.
*ThehighvoitagepowerforCRTaswellasthe
powerforothercircuitsisfullystabilized,thus
thesensitivityandluminancearecompretely
free from effectsofvoltagevariations,
*X-Yoperationispossible with CH2amplifier
used asX axis.
The horizontal axis sensitivityisashighas10
mV/div, permitting accuratecalibrations.
*Sumanddifferencebetween2 channelscanbe
measured bytheuseofmodeselectorswitch
and CH2selectorswitch.
CONTENTS
Page
Features ^
2
Specifications
Controlson Panels *
Operation^
Preliminary Operation^
OperatingProcedures^
Power Supply®
Battery Charging8
Mounting ofHood®
Applications^
Dual-trace Applications^
Single-channel Applications1^
FM Receiver Adjustments21
X-Y OperationsApplications21
AmplifierSquareWave Test 23
PRECAUTIONS 28
MAINTENANCE AND ADJUSTMENT
Maintenance28
Adjustment29
SCHEMATIC DIAGRAM31
*Time base switchallowschangeoverbetween
CHOP andALTandbetweenV (vertical)andH
(horizontal)ofTV sync separatorcircuit,
automaticallyandelectronically.
*At AUTO positionof TRIG LEVEL, itispossibleto
check theluminanceatno-sighaltimeandtoad-
just triggering levelof input waveforms.
*Theemploymentof digital switchcircuitand
mechanical partscleverlymountedoncircuit
boards assure improvedreliability.
*Theover-dischargeprotectioncircuit
automaticallyshutsoffthebatterycircuitwhen
batteryvoltageislow.
*The built-in chargingcircuitpermitsthebattery
tobechargedwhiletheoscilloscopeisinuse.
1

SPECIFICATIONS
Type ofCathodRayTube:
C331P31B
AccelerationVoltage:
Approx.1.5kV
VerticalAxis(for both CHIandCH2)
Sensitivity:
2 mV/div~10V/div,±5%in1-2-5sequence(1
div=0.6 cm)
Vernier control for fully adjustablesensitivity
betweensteps.
Input Impedance:
1MS2 ±5%.
Input Capacitance:
Approx.22pF
Frequency Response:
DC DC-15MHz (less than-3dB)
AC 10Hz-15MHz (less than-3dB)
Rising Time:
Less than23nsec.
Over-shoot:
Less than3%(at100kHzsquarewave)
Cross-talk:
Betterthan70dBat1 kHz
OperatingMode:
CH1: Channel1 only
CH2: Channel2 only
DUAL. 2-channel (CHOP andALTare
automaticallyselectedby SWEEP
TIME/DIV) 0.5/xs/div~ 0.5ms/div:
ALT (alternatesweep) 1 ms/div~
0.5s/div: CHOP
ADD: 2-channelalgebraicsum(CH1+CH2)
InvertPolarity:
CH2 only
CHOP Frequency:
200kHz±20%
Maximum Input AllowableVoltage:
600Vp-por300V(DC+ ACpeak)
SweepCircuit
Sweep System:
Triggeredandautomatic.Inautomaticmode,
sweep is obtained without input signal
Sweep Time:
0.5;us/div~0.5s/div±5%in19rangesand
"X-Y", in1-2-5sequence. Each overlapping
rangeprovidesforfineadjustament
Magnifier:
5 times±5% (PULLx 5 MAG)
Linearity:
Betterthan3%(2)us/div~ 05s/div)
Betterthan5%(0.5jus/div~ 1/is/div)
Synchronization
Sync Input:
INT: Mode switchchangeover,CH 1 at
DUAL
EXT
Sync Selection:
NOR: positiveandnegative
TV: positiveandnegative
(TVH andTVVareautomaticallyswitchedby
SWEEP TIME/DIV)
TVH (TV- Line):0.5Ms/div~ 50jts/div
TVV (TV- Frame):0.1ms/div~ 50s/div
Sync Range:
Sync
Position
Sync
Frequency
Min.syncvoltage
(amplitude)
Sync
Position
Sync
Frequency
INT
EXT
20Hz~5 MHz 05 div 0.5Vp-p
NOR
20Hz~10MHz 1 div 0.5Vp-p
20Hz-15MHz
1 div
1 Vp-p
(AUTO)
50Hz-15MHz 1 div
1 Vp-p
TV TV
signal 1 div
1 Vp-p
External sync input voltage:
50V (DC+ ACpeak)
HorizontalAxis(CH2 input)
OperatingMode:
X-Y modeisselectedby SWEEP TIME/DIV
CH 1:Y axis
CH2: X axis
Sensitivity:
Same asCH1
(2 mV/div~ 10V/div± 5%)
Frequency Response:
DC DC-1MHz (less then -3dB)
AC 10Hz-1MHz (less than-3dB)
Input Impedance:
Same asCH 1 (1M12±5%)
Input Capacitance:
Same asCH 1 Approx.22pF
CalibratingVoltage:
1 Vp-p±3%positive.(1kHz±5%squarewave)
Luminance Modulation
Input Voltage:
Lightsat+ 5Vor less
2

Input Impedance:
10kfi±20%
Frequency Response:
DC ~ 1 MHz
Maximum Input AllowableVoltage:
50V (DC+ ACpeak)
PowerSource
AC
Power SupplyVoltage:
100/120/220/240V ±10%.50/60Hz
Power Consumption:
Approx.25W
Battery(Option)
Power SupplyVoltage:
12V
ContinuousOperationTime:
More than2 hours with fully chargedbattery
DC
Power SupplyVoltage:
1 1 ~ 15.5V
Power Consumption:
Approx.20W
Charging
Charging System:
InternalbatteryischargedbyconnectingAC
linecord
ChargingTime:
Charging during operationApprox.28H
ChargingonlyApprox.16H
AmbientTemperatureand Humidity:
0~ 50°C,95%or less
Dimensions andWeight
Width:
210 mm
Height:
136 mm
Depth:
348 mm
Projectionsnotincluded.
Weight:
6.5kg (without battery)
8.3kg(withbattery)
Accessories
Probe:
PC-29 2
Damping1/10
Input impedance10MQ
Input capacitance less than18pF
Pin-plug:
1
Replacement fuse:
0.5A2
1A 2
Hood (BF-6) 1
External powerconnectorplug1
InstructionManual:
1 copy
External powerconnector plug 1
Optional accessories:
Shoulderbag(MC-75)
Batterypack (BP-7E)
3

CONTROLS ONPANELS
FRONT PANEL
4
Fig. 1
SIDEPANEL
Fig. 2

1. $ POSITION a
VerticalpositionadjustmentforCH1traceand
Y positionforX-Yoperation.Waveformscan
besettoanydesiredverticalposition.Turning
this control tothe right willshiftwaveformup-
ward, andvice versa.
2. INPUT
Vertical input terminalofCH1(orY inX-Y
mode).
3. AC-GND-DC
DC Direct input ofACandDCcomponent
of input signal.
GND Openssignalpathand ground input to
verticalamplifier. This providesa zero-
signalbaseline,thepositionofwhich
can beusedasa referencewhenper-
forming DCmeasurements.
AC BlocksDCcomponentof input signal.
4. VARIABLE
Verticalattenuatoradjustmentprovidesfine
control ofverticalsensitivity.Intheextreme
clockwise (CAL)position,thevertical
attenuatoriscalibrated.
5. VOLTS/DIV
VerticalattenuatorforChannel1;provides
coarse adjustmentofverticalsensitivity.Ver-
ticalsensitivityiscalibratedin12steps from 2
mVto10voltsperdivisitonwhen VARIABLE
control (4)issettotheCALposition.
6. MODE(CH1,CH2,DUAL,ADD)
CH1: Onlythe input signaltoCH1isdis-
playedasa singletrace.
CH2: Onlythe input signaltoCH2isdis-
playedasa singletrace.
DUAL: Intherangeof0.5s/divto 1 ms/div,
the input signalsto both channelsare
switchedbyabout200kHzsignal
(CHOP operation).
Intherangeof0.5ms/divto 0.5ms/-
div,the input signalsto both
channels arealternatelyswitchedfor
each sweep(ALToperation).
ADD: Thewaveforms from Channel1 and
Channel 2 inputsareaddedandthe
sum isdisplayedasa singletrace.If
thechannel2 polarityswitch(11)is
pulledout (PULL INV),thewaveform
from Channel2 issubtracted from the
Channel 1 waveformandthe
differenceisdisplayedasa single
trace.
7. VOLTS/DIV
VerticalattenuatorforChannel2 which
providesstepadjustmentofverticalsensitivi-
ty.Verticalsensitivityiscalibratedin12steps
from 2 mVto10voltsperdivisionwhen
VARIABLE control (8)issettoCALposition.
This control adjustshorizontalsensitivitywhen
the SWEEP TIME/DIVswitch(21)isintheX-Y
position.
8. VARIABLE
Verticalattenuatoradjustmentprovidesfine
control ofverticalsensitivityofCH2(orX).
This control becomesthefinehorizontalgain
control whenthe SWEEP TIME/DIVswitchis
intheX-Yposition.
9. AC-GND-DC
DC Direct input ofACandDCcomponent
of input signal.
GND Openssignalpathand ground input to
verticalamplifier. This providesa zero-
signalbaseline,thepositionofwhich
can beusedasa referencewhenper-
forming DCmeasurements.
AC BlocksDCcomponentof input signal.
10. INPUT
Vertical input terminalforCH2(orX).
11.
A
POSITION, X-Y^
VerticalpositionadjustmentforChannel2
trace. Becomeshorizontalpositionadjust-
mentwhen SWEEP TIME/DIVswitch(21)isin
theX-Yposition.Push-pullswitchinverts
Channel 2 signalwhenpulledout(CH2
POLARITY PULL INV),non-invertedsignal
whenpushedin.
12. POWER LAMP
Lightswhenscopeison,dimswhenbatteryis
low,goesoffwhenbatteryistoolowfor
operation.
13. CHARGE LAMP
Lightswhenbatteryischarging,goesoffwhen
batteryis fully charged.Chargeroperates
whenever scopeisconnectedtoACpower,
regardless ofwhetherscopeisturnedonoroff.
14. POWER/INTEN
Fully counterclockwise rotation ofthis control
(OFF position)turnsoscilloscopeoff.
Clockwise rotation turnsoscilloscopeon.
Furtherclockwise rotation ofthe control
increases theintensityofthetrace.
5

15. FOCUS
Spot focuscontroltoobtainoptimum
waveformaccordingtobrightness.
16. SOURCE
Selects triggeringsourceforsweep.
INT: Sweep istriggeredbythewaveform
beingviewed:inDUALandADD
modes, sweepistriggeredbyCH1
signal.
EXT: Sweep istriggeredbythesignal
appliedtoEXT TRIG jack(29).
17. SYNC
Sync separatorswitch.Itpicksup sync signal
componentinTVvideosignalandappliesto
sync circuitforcompletesynchronizationof
videosignalbeingviewed.
NOR: Usedforviewingallwaveformsex-
cepttelevisioncompositevideo.
TV: The sync pulsesofa televisioncom-
positevideosignalareusedtotrigger
thesweep;thevertical sync pulses
(TVV-frame) areautomatically
selected forsweeptimesof05s/div.
to01ms/div.,andhorizontal sync
pulses (TVH-line)areautomatically
selected forsweeptimesof50jus/div.
to0.5/Lts/div.
18. SLOPE
Sunc polarityselectorswitch.Atthe" + "
position,sweepiseffectedwithpositiveslope,
and atthe" —"position,itiseffectedwith
negativeslope.
19. TRIG. LEVEL
Sync leveladjustmentdeterminespointson
waveformslopewheresweepstarts;(—)
equals mostnegative point oftriggeringand
( + ) equalsmostpositive point oftriggering.
PULL AUTO:
Push-pull switch selects automatictriggering
when pulledout (PULL AUTO). When
automatictriggering,a sweepisgenerated
without aninputsignal.
20. POSITION
Horizontalpositionadjustertoshiftwaveform
toanydesiredhorizontalposition.A right turn
oftheadjusterwillshiftthewaveformto right,
and vice versa.
PULL X5MAG:
Sweep magnifierswitch.Bypullingtheknob
towardyou,waveformismagnifiedto5 times
inleftand right directions.Brightnessis
slightly decreased.
21. SWEEP TIME/DIV
Horizontalcoarsesweeptimeselector.
Selects calibratedsweeptimesof0.5/us/div.
to0.5s/div.,in19stepswhen VARIABLE
control(22)issettotheCALposition(fully
clockwise). IntheX-Yposition,thisswitch
disables theinternalsweepgeneratorand
permitstheCH2inputtoprovidehorizontal
sweep.
22. VARIABLE
Fine sweeptimeadjustment.Intheextreme
clockwise (CAL)position,thesweeptimeis
calibrated.
23. CAL1 Vp-p
Provides calibrated1 kHz,1 voltpeak-to-peak
square wavecalibrationsignal. This isusedfor
calibrationoftheverticalamplifierattenuators
and tocheckthefrequencycompensationad-
justmentoftheprobesusedwiththeos-
cilloscope.
24. HANDLE
Use thishandletomounttheoscilloscopeina
slant position.
25. AC VOLTAGE SELECTOR
The CS-1352 maybeoperatedfrom100V,
120V, 220V,240V, putting theAC VOLTAGE
SELECTOR intheplaceofanother.
26. FUSE HOLDER
For 220~ 240Voperationa 0.5amperefuse
shouldbe used.
For 100~ 120Voperationa 1 amperefuse
shouldbe used.
27. POWER CONNECTOR
For connectionofthesuppliedACpowercord.
28. INTMOD
Intensity(brightness)modulationterminal.
Intensityismodulatedatvoltagesof+ 5V.
29. EXT TRIG
External sync inputterminal.Forexternal syn-
chronization,setthe SOURCE switch(16)to
EXT toapplyexternal sync voltage.
30. ASTIG
Astigmatismadjustmentprovidesoptimum
brightnessandspotroundnesswhenusedwith
the Focus knob.Very little readjustmentof
thiscontrolisrequiredafterinitialadjustment.
31. EXTDC
6

External DCpowerjacktosupply11~ 1 5.5V
DC power.
32. VOLTAGE NAMEPLATE
Be suretousevoltageandfusespecified.
33. CORD REEL
Used towindpowercordwhentheos-
cilloscopeistobecarriedorstored.Italso
serves asa standwhentheoscilloscopeis
used in upright position.
OPERATION
PRELIMAINARY OPERATION
Whenoperatingthisoscilloscope,refertopanelcontrolsandtheirfunctions.Whenstartingthisoscilloscope
set initially,settheoperatingcontrolsasfollowsandthesetmaybeturnedonsafely.
Fig. 3
OPERATING PROCEDURES
1. Selectthe position ofthepowervoltage selec-
tor plug asindicatedbythearrowmarks.Then
insertthesuppliedpowercordtothepower
connector.
2. Turn POWER/INTEN (14)clockwise.The
poweristurnedtoONand POWER lamp(12)
lights.
3. Horizontal axis will bedisplayed.Whenfly-
back linedoesnotappearatthecenterofthe
screen, adjust^ POSITION (1)and
^•POSITION PULL X5MAG(20).
Adjustbrightnessby POWER/INTEN (14).If<-
tracelineisunclear,adjust FOCUS (15).
4. Theoscilloscopeisnowreadyformeasure-
ment.Formeasurement,proceedasfollows:
Applysignalvoltagetothe input terminals(2)
and(10).Then turn the VOLT/DIV (5),
clockwise until thewaveformiscorrectlydis-
playedonthe screen. BysettingtheMODE
switch(6)toCH1andthe SOURCE switch
(16) toINT,theCH1 input signalto INPUT ter-
minal(2) will appear.WhentheMODEswitch
(6) issettoCH2,thenthe input signalto
INPUT terminal(10) will appearonthescope.
WhentheMODEswitch(6)issetto DUAL,
twowaveforms(CH1andCH2) will appearon
thescope,atthistime,theCH1signaltothe
INPUT terminal(2)isfedtothesyncrocircuit
wheretheCH 1 signalissynchronized.When
theMODEswitch(6)issettoADD,theCH1
signalisalgebraicallyaddedtotheCH2signal
(CH 1 + CH2).By pulling CH2 POLARITY
(11), theCH2signalinreverse polarity isadd-
edtotheCH1signalandthealgebraic
7

differencebetweenCH1andCH2isdisplayed
(CH1 - CH2).
5. Whenthesignalvoltageismorethan2mVand
waveformfailstoappearonthe screen, theos-
cilloscope maybecheckedbyfeedinginput
fromCAL1 Vp-p(23). Since calibration
voltageis1 Vp-p,thewaveformbecomes5 div
highatthe0.2/divposition.
6. Bypushing TRIG LEVEL (19).thefree-running
autofunctionis released. Thewaveformdis-
appears whentheknobisturnedclockwise,
and appearsagainwhenitisreturnedtoitsap-
proximatemiddlepositionofit. Sync phaseis
also adjustableinthis case. Thewaveformwill
again disappearwhentheknobisturned
counterclockwise fromthemidposition.
7. WhenDCcomponentismeasured,set
AC-GND-DC (3)or(9)toDCposition.If,in
this case, theDCcomponentcontainsplus
"+ " potential,thewaveformmovesupward
and ifitcontainsminus" —"potential,the
waveformmovesdownward.
The reference point of"0"potentialcanbe
checked atGNDposition.
POWER SUPPLY
The oscilloscopeisdesignedtooperateonAC,in-
ternalbatteryorexternalDC.
AC operation
For ACoperation,firstsetthepowervoltage selec-
torswitchtothevoltageofyourlocalACcurrent.
Then, connecttheACcord.Theconnectionofthe
AC cordautomaticallydisconnectstheinternal
battery.
Operationoninternalbattery(option)
Install thebatterypackintheoscilloscopeaccoring
tothefollowingsequence(refertothediagramon
therearofthe case):
*OpenthepackageofthebatterypackBP-7(op-
tion)andchecktomakesurethatitcontainstwo
6V leadbatteriesandconnecting leads.
* Place theoscilloscopewiththeupsidedown,
removethe4 screws on both sides usinga
screwdriver. Holdthecordreelandpullitout.
The battery case coverwillberemoved.
* Release theleadfromthecordclamperandthen
removethescrew(4x 40mm)asshowninthe
diagram.
*Connectthe2 batteriesin series usingthecon-
necting leads, thenconnecttheleads(redand
black) oftheoscilloscopetothebatteries.Make
sure thattheredleadisconnectedto"+"and
theblackleadto" —"side.
*Afterthebatterieshavebeenconnected,insert
thebattery case fromtherearandreplacethe
battery case cover.Thebatteryleadsshouldbe
arranged ontopofthebatteriessothattheyare
notcaughtbetweenthebatteriesandthebattery
case.
*Tightenthe4 screws fromeachsideofthe case
and thescrew(4x 40mm)fromtherearofthe
case.
Now,theoscilloscopeisreadyforoperation. Refer
totheinstructionsinthepreviousparagraph "Con-
trolson Panels". Withtheinternalbattery,theos-
cilloscope canbeoperatedformorethan2 hours,
althoughthisdependsontheconditionofthe
battery.
When thebatteryvoltagefallsdownto10Vduring
operation,theprotectioncircuitisactivatedtoshut
offthebatterycircuit.Inthis case, thepowerlamp
goes offindicatingthatthebatteryisprotected
against over-discharge.Whenthishappens,the
batteryshouldberechargedfullyandimmediately,
(refer toitem"BatteryCharging")
The powerlampwillstartblinkingtoindicate
batteryvoltagedrop10minutesbeforetheprotec-
tion circuitoperates.
OperationonexternalDC(11~ 15.5V)
Connect a DCpowercordfromDC12Vreceptacle
(31) toa nominal12voltDCpowersource(11to
15.5 VDC),suchasa vehiclecigarettelighter.
Observe properpolarity;theoscilloscopeis
protectedagainstreversepolaritydamage,butwill
notoperateifpolarityis reversed.
Turn on POWER/INTEN control(14).
POWER indicator(12)shouldglow,andthescope
is readyforuse.
If CHARGE indicator(13)glows,thebatteriesare
chargingtheindicatorgoesoffwhenthebatteries
are fullycharged.
BATTERY CHARGING
To chargetheinternalbattery,connecttheACline
cordtoACoutlet.Thebatteryischarged
regardless ofthepositionofthepowerswitch.
When batterychargeisstarted,the CHARGE lamp
will light. Withthepowerswitchsetto OFF, the
batteryisfullychargedinabout16hours.Withthe
switch settoON,thebatteryischargedinabout
28 hours;theoscilloscopecanbeusedwhilethe
batteryisbeingcharged.Theexternalpowercon-
8

nectorplugmustbedisconnectedwhilethebattery
is beingcharged.
Whenthebatteryisalmostfullycharged,the
CHARGE lampbecomesdimandfinallygoesoff.
Continuechargingforabout2 hours,thenthe
batterywillhavebeenfullycharged.
MOUNTINGOFHOOD
The suppliedhoodcanbemountedontheos-
cilloscopeasshowninFig.4.
APPLICATIONS
DUAL-TRACE APPLICATIONS
Introduction:
The mostobviousandyetthemostusefulfeature
ofthedual-traceoscilloscopeisthatithasthe
capabilityforsimultaneouslyviewingtwo
waveforms thatarefrequency-orphase-related,or
thathavea commonsynchronizingvoltage,suchas
in digital circuitry.Simultaneousviewingof input
andits output isaninbaluableaidtothecircuit
designerortherepairman. Several possible
applicationsofthedual-traceoscilloscopewillbe
reviewed indetailtofamiliarizetheuserfurtherin
thebasicoperationofthisoscilloscope.
Frequency DividerWaveformsViewing:
Fig. 5 illustratesthewaveforminvolvedina basic
divide-by-twocircuit.Fig.A indicatesthe
reference orclockpulsetrain.Fig.B andFig.C in-
dicatethepossibleoutputsofthedivide-by-twocir-
cuitry.Fig.5 alsoindicatesthesettingsofspecific
oscilloscopecontrolsforviewingthesewaveforms.
In addition tothesebasiccontrolsettings,the
TRIGGERING LEVEL control,aswellasthe
Channel 1 andChannel2 verticalpositioncontrols
shouldbesetasrequiredtoproducesuitabledis-
plays. InthedrawingofFig.5 thewaveform
levels of2 divareindicated.Ifexactvoltage
measurements ofChannel1 andChannel2 are
desired, theChannel1 andChannel2 VARIABLE
controlsmustbeplacedintheCALposition.The
Channel 2 waveformmaybeeitherthatindicated
inFig.5BorFig.5C.InFig.5C,thedivide-by-
two output waveformisshownforthe case where
the output circuitryrespondstonegative-going
Fig. 5 Waveformsindivide-by-twocircuit.
9
HOOD
BEZEL
INSERT CLAWS INTO
4 HOLES
Fig. 4 MountingofHood
CH 1
A. REFERENCE FREQUENCY PULSE
TRAIN(1000 PULSES PERSECOND)
LEADING EDGES MAYNOTBE
VISIBLE AT FAST SWEEP RATES
CH 2
B. DIVIDE-BY-TWOOUTPUTSYNCHRONIZEDTO
LEADING EDGE OF REFERENCE PULSE
CH 2
C. DIVIDE-BY-TWOOUTPUTSYNCHRONIZEDTO
TRAILING EDGE OF REFERENCE PULSE