Kenwood CS-1575 A User manual

CS-1575A
(DUALTRACEOSCILLOSCOPE)
INSTRUCTION MANUAL

SAFETY
Symbol in This Manual Use the ProperPowerCord
^ This symbolindicateswhereapplicablecautionary or Useonly the powercord and connectorspecified for your
otherinformationis tobe found.product.
PowerSourceUsetheProperFuse
This equipmentoperatesfrom a powersourcethatdoes To avoidfirehazard,use a fuse ofthe correcttype,
notapplymorethan 250V rms between the supplycon-
ductors or betweeneithersupplyconductor and ground. A Donot Operate inExplosiveAtmospheres
protective ground connection by way of the grounding con- To avoidexplosion, donot operatethisproduct inanex-
ductor inthe powercord is essential for safe operation.plosiveatmosphere.
GroundingtheProductDonotRemoveCoverorPanel
This equipment is grounded through the grounding conduc- To avoidpersonalinjury, donot removethecover or panel,
tor ofthe powercord. To avoid electrical shock,plug the Referservicing to qualifiedpersonnel,
powercordinto a properlywiredreceptaclebeforeconnec-
ting tothe equipmentinput or outputterminals.
CONTENTS
SAFETY 2
FEATURES 3
SPECIFICATIONS 3
A PREPARATIONFORUSE5
CONTROLSANDINDICATORS6
FRONTPANEL.6
REAR PANEL ............. 8
OPERATION9
PRELIMINARYOPERATION9
OPERATINGPROCEDURES9
TRIGGERINGOPERATION9
USE OFDUAL-H,DUAL-VANDDUAL-H,CH2POSITION10
USE OFPHASEDISPLAYANDPAHSEMEASURMENT10
WAVEFORMSETTING WITH PHASEDISPLAYANDCONTROLKNOBS11
APPLICATIONS13
APPLICATIONSOFPHASEDISPLAY13
AMPLIFIERSQUAREWAVE TEST 16
OTHERAPPLICATIONS. 20
A MAINTENANCE21
ACCESSORIES 22
2

FEATURES
1. Highsensitivity of10 mV/div or more and wideband-
width of5 MHz(-3 dB).
2. Dual-traceoperation and X-Yoperationcan be achieved
simultaneously by use of the PHASEDISPLAY switch.
3. Functions asa conventionaldual-traceoscilloscope
(DUAL-V) and stereoscope(DUAL-H).
4. ZerophaseLissajous'figure is displayed atthe same
timeduring X-Y operation,making it possible to
measurephasedifferenceaccurately throughout the
range oflowand highfrequencies.
5. Triggersource is selectedautomaticallyduringsingle
ordualtraceoperationwith the use of dualtriggering
system.
6.CHOP and ALT are interlockedwithtimebaseswitch
topermitautomaticselection.
7.X-YselectionallowsCH1amplifier tobe usedas Y axis
amplifier andCH2 amplifier asX axis amplifier inX-Y
operation mode.
8.Autofree-runsystemenables the trace tobe checked
even at no-signal.
9. The highvoltagepower for theCRTisfullyestablished
by theuseof DC-DC converter,assuringreliablesen-
sitivity and brightnessagainstvoltagefluctuation.
10. The adoption of ICs throughout the circuitryimproves
reliability.
11. Low powerconsumption (25W)for cool and reliable
operation.
SPECIFICATIONS
CATHODERAY TUBE
SWEEP
Type : 130BEB31
Sweep system :
Autofree-runsweep(free-run
Acceleration voltage : 2 kV
sweep at no-signal)
Useful measuring : 8 divxIO div(1 div= 1 cm) Sweep frequency : 10Hz-50 Hz,50 Hz-200 Hz,
VERTICAL AXIS(for both CH1andCH2)
200Hz-1 kHz,1 kHz-5 kHz,
Sensitivity :
Attenuator :
10mV/div or higher
1-3steps, 1/1to 1/300, 6
5 kHz-20 kHzand
20kHz-100 kHz
ranges, preciselyadjustable
betweenranges.
Linearity :
Fine adjustment in6 ranges.
Less than 5%
Inter-channel error is±5%.
TRIGGERING
Inputimpedance : 1 MO±3%
Source :
Approx. 30pF LINE :
Fixed to supplyfrequency.
Frequencyresponse : DUAL : Source is automaticallyselected
DC : DC to5 MHz(-3 dB),
DC to7 MHz(-6 dB)
to the waveform ofCH1or
CH2
AC : 5 Hzto5 MHz(-3 dB), CH1
:
Fixed to CH1signal.
5 Hzto7 MHz(-6 dB) CH2 :
Fixed toCH2 signal.
Risetime : 70nsec EXT :
Fixed to externalsignal.
Crosstalk : Less than -40dB(at1 kHz) Triggeringlevel :
Set by the TRIG.LEVEL switch.
Operating mode : Slope :
Positive only
CH1 : Channel 1 only,singletrace Coupling :
AConly(inclusive of EXT)
CH2 : Channel 2 only,singletrace
External triggering :
DUAL-H : Horizontaldualtrace Inputimpedance :
Approx. 1 MO, approx. 50pF
DUAL-V : Vertical dualtrace /\ Maximuminput Approx.
1 MO, approx. 50pF
X-Y : CH1 = Y axis, CH2 = X axis
voltage :
100 Vp-p or
Dual-trace selection : Automaticselection of CHOP 50
V (DC + AC peak)
andALT(Switched to CHOP at
Triggeringrange :
50 V (DC + AC peak)
about 80kHz whenSWEEP Internal
RANGEisset to10-50Hzand
(DUAL,CH1, CH2) :0.5div(50
Hz-3 MHz)
TRIG.SOURCE isin LINE,CH1,
1 div (20 Hz-5 MHz)
CH2 or EXT.Switched to ALT External (EXT) :
0.5 Vp-p(50 Hz-3 MHz)
at othersettings.)
1 Vp-p (20 Hz-5 MHz)
Phase indication : X andY are simultaneously
displayed by PHASEDISPLAY.
HORIZONTALAXIS
(CH2)
ZerophaseLissajous'figure is
Operating mode : X-Y mode is selected by
displayed at the sametime dur-
DISPLAY MODE switch.
ingX-Yoperation.
Sensitivity :
CH1: Y axis, CH2: X axis
/^Maximuminput 600
Vp-p or
Sensitivity :
Same as vertical axis (CH1)
voltage :
300 V (DC+ AC peak) Inputimpedance
: Same as vertical axis (CH1)
3

SPECIFICATIONS
Plugconfiguration Powercordandplugtype
Factory installed
instrumentfuse
Line cord
plugfuse
Parts No.for
powercord.
North American
1 20 volt/60 Hz
Rated 1 5 amp
(12ampmax;NEC)
0.7A,250V
Fast blow
AGC/3AG
None
E30-1 820-05
Universal Europe
220 volt/50 Hz
Rated16amp
0.3A,250V
T. lag
5x20mm None E30-1819-05
U.K.
240 volt/50 Hz
Rated13amp
0.3A,250V
Fast blow
6x30 mm
0.3A
TypeC
Australian
240 volt/50 Hz
Rated10amp
.0.3A,250V
Fast blow
6x30mm None E30-1821-05
North American
240 volt/60 Hz
Rated 1 5 amp
(12ampmax;NEC)
0.3A,250V
Fast blow
AGC/3AG
None
Switzerland
240 volt/50 Hz
Rated10amp
0.3A,250V
Fast blow
AGC/3AG
6x30mm
None
Fig. 1 PowerInputVoltageConfiguration
4
Frequencyresponse :
DC : - DCto 1 MHz(-3 dB),
DC to1.5MHz(-6 dB)
AC : 5 Hz to 1 MHz(-3 dB),
5 Hz to1.5MHz(-8 dB)
X-Y phasedifference : Less than 3°at50 kHz
X-Y distortionless
amplitude : More than 8 div x 8 divat
100kHz(POSITION:Center)
CALIBRATION VOLTAGE: '
0.6Vp-p ±5%
Positive squarewave of power
supplyfrequency
POWER SUPPLY
Powersupplyvoltage : AC100V/120V/220 V ± 10%,
216 V - 250 V, 50/60 Hz
Powerconsumption : Approx. 25W
DIMENSIONS
Width : 260mm (260 mm)
Height : 190 mm (214mm) .
Depth : 375 mm (440 mm)
Figures in( ) showmaximum
size.
WEIGHT: 8 kg
ACCESSORIES :
BNCcord :.2
ACcord : 1
Instruction manual : 1
Replacementfuse : 0.3A2
0.7A 2
OPTIONAL ACCESSORIES :
PC-30(attenuator probe)
Attenuation : 1/10,1/1
Inputimpedance : 10M0,22pF±10% (1/10)
1 M0,200pFor less (1/1)

PREPARATIONFORUSE
SAFETY
Beforeconnectingtheinstrument toa powersource, care-
fullyread the followinginformation,thenverifythat the
properpowercord is used andthe properlinefuse is
installed for powersource.Thespecifiedvoltageisshown
ontherearpanel.Ifthepowercordis not applied for speci-
fiedvoltage,thereisalways a certainamount of dangerfrom
electric shock.
Line voltage
This instrumentoperatesusingAC-powerinputvoltages
that100/120/220/240 V at frequenciesfrom 50Hzto
60 Hz.
Power cord
The ground wire ofthe 3-wire AC power plug places the
chassis andhousing of theoscilloscopeatearth ground. Do
notattempt to defeat the ground wireconnection or float
theoscilloscope; todosomay pose a greatsafetyhazard.
Theappropriatepowercord is supplied byan option that
is specifiedwhen the instrument is ordered.
Theoptionalpowercords are shown as follows in Fig. 1.
Linefuse
Thefuseholder is located onthe rearpanel and contains
thelinefuse.Verifythat the properfuse is installed by
replacing the linefuse.
EQUIPMENT PROTECTION
1. Neverallow a smallspot of highbrilliance to remain sta-
tionary on thescreen for morethan a fewseconds.The
screen may becomepermanentlyburned. A spot will
occur onlywhenthescope is set upfor X-Yoperation
and no signal is applied.Eitherreducetheintensity so
thespotisbarelyvisible, switch back to normalsweep
operationwhen no signalisapplied, or set up thescope
forspotblanking.
2. Nevercovertheventilatingholes on the topof theos-
cilloscope, asthis will increasetheoperatingtempera-
tureinside the case.
3. Neverapplymorethan the maximumrating to the os-
cilloscope inputs.
• ^CH1, CH2 INPUT jacks: 600Vp-por300V
(DC + ACpeak)
EXT. TRIGinput jack: 100 Vp-p or50V (DC + ACpeak)
4.Alwaysconnect a cablefrom the earth ground (GND)
jack of theoscilloscope to the chassis of theequipment
under test. Without thiscaution,theentirecurrent for
theequipmentundertest maybe drawn through the
probe clipleadsundercertaincircumstances.Suchcon-
ditionscouldalsopose a safetyhazard,which the
ground cable will prevent.
5. Operationadjacenttoequipmentwhichproducesstrong
ac magneticfieldsshould be avoidedwherepossible.
This includessuchdevices as largepowersupplies,
transformers, electric motors,etc.,thatareoften found
in an industrialenvironment.Strongmagneticshields
can exceedthepracticalCRTmagneticshieldinglimits
andresultinterference and distortion.
5

CONTROLSANDINDICATORS
FrontPanel:
©A posiTION
This controladjustsverticalpositionduring CH1orX-Y
operation. A rightturn will shift the waveformupward.
©v POSITION,X-Y<«•
This controladjustsverticalposition forCH2.It also ad-
justs horizontalpositionduring X-Y operation. A rightturn
will shift the waveformupward, ortothe rightduring X-Y
operation.
© INPUT
Inputterminal for CH1 (orY)
(4) INPUT
Inputterminal forCH2(or X).
©AC-GND-DC
Inputselector for CH1 (or Y).
®AC-GND-DC
Inputselector forCH2(or X).
®VERT.ATT
Attenuator for CH1 (or Y).Selectable m 6 rangesfrom 1/1
to1/300.Maximumsensitivity is obtainedwhen
VARIABLE (9)is turnedfully clockwise.
(DVERT.ATT
Attenuator forCH2(or XI. It functions the same as VERT
ATT® .
(DVARIABLE
Attenuator for finecontrol of CH1 (or Y).
®VARIABLE
Attenuator for finecontrol ofCH2(orX).
©CAL.0.6Vp-p
Calibrationvoltageterminal.Calibrationvoltage is0.6Vp-p
ofsquarewave of powersupplyfrequency.
©DISPLAY MODE
Operation mode selectorwith the followingfunctions.
CH1 : Only the inputwaveform to CH1 is displayed.
CH2 : Only the inputwaveform toCH2is displayed.
DUAL-H : Twoinputsignalsaredisplayed at theleft and
right.
. DUAL-V : Two inputsignals are displayed attheupand
downpositions.
X-Y : X-YoperationwhereCH1 = Y andCH2= X.
CHOP andALTare interlockedwithSOURCE
@and SWEEPRANGE © for automatic
selection. Refer to SWEEPRANGE © .
®PHASEDISPLAY
Phase indicating switch. X andY are simultaneously in-
dicated whenDISPLAY MODE © issetto DUAL-H or
DUAL-V, and zerophase Lissajous' figure is indicated at
thesametimewhenDISPLAY MODE © isat X-Y.
6

® SOURCE
Triggersignalselectorwith the followingfunctions,
LINE : Synchronized tothe powersupplyfrequency.
DUAL : Source is automaticallyselectedaccording to
thewaveform of CH1 or CH2.
GH1 : CH1 signalbecomesTriggersignal.
CH2 : CH2 signalbecomesTriggersignal.
EXT : Inputsignal of EXTTRIG @ becomesTrig-
gersignal.
® LEVEL '
This controladjustsTriggeringlevel. It determinesthestar-
ting point of sweep onthe slope of syncsignalwaveform.
®EXT.TRIG/
Inputterminal for externalTriggersignal.
©SWEEPRANGE
Horizontalsweeptimeselector. It selects in6 ranges from
10-50 Hzto20 kH-100kH. For dual-traceobservation in
therange of 10-50 Hz, both channels are switched to
CHOP at about 80kHzif SOURCE ® isset to LINE,CH1,
CH2 or EXT. In other cases, theyareswitched to ALT.
©VARIABLE
Used for fineadjustment of sweeptime.
©< • POSITION
Horizontalpositionadjuster. A right ' turn will shift
waveform tothe right. It does not functionwhenDISPLAY
MODE © isin X-Yposition. '
@). DUAL-tt CH2 POSITION
This controladjustshorizontalposition ofCH2 onlywhen
DISPLAY MODE.' © isin DUAL-Hposition. A rightturn
-will shift,waveform tothe right.
© LEDPILOT LAMP
This lamplightswhen POWER switch © is turned on.
@) POWER/INTENSITY
Functions asa powerswitch and intensitycontrol.Turning
fullycounterclockwise will turn the power OFF. Turning
clockwise will turn the power ON. Furtherturning will in-
crease the brightness of waveform.
©FOCUS
Spotfocuscontrol to obtain optimum waveform
according to brightness.
7

REAR PANEL:
® CRTcower
Used for adjustment of traceangle.Refer to "Maintenance".
© VOLTAGEPLATE
Use only the voltages and fusesspecified.
@ FUSEHOLDER
Fuse rated at0.7A is used for100V or 11 7 V operation.
For operation on220V or240V, replace it with one rated
at 0.3A.
©ACVOLTAGE SELECTOR
Beforeoperating,setthisselector to the AC powervoltage
used.
®POWERCONNECTOR
Forconnection oftheAC powercordsupplied. Usethe
supplied AC cord.
®CORDWRAP
Used to wind the powercordwhen the oscilloscope is car-
ried or stored. It alsoserves asa stand.
8

OPERATION
PRELIMINARYOPERATION
When operatingtheoscilloscope,refertopanelcontrolsandtheirfunction.Beforethepowerswitchisturnedon,setthecon-
trols asfollows.
OPERATING PROCEDURES
(1) TurnPOWER/INTENSITY @ clockwise.Thepoweris
turned toON andLEDPILOTLAMP © lights.Turn
POWER/INTENSITYfurtherclockwiseuntilthesetting
mark.indicates therighthorizontalposition.
121 Horizontaltrace will bedisplayed. When tracedoesnot
appear at thecenter of thescreen,adjust % POSI-
TION ® or< • POSITION © to center.Adjust
brightness by POWER/iNTENSlTY © . If trace is
unclear, adjustFOCUS @ .
(3) Theoscilloscopeisnowreadyformeasurements.Apply
a signal tobe measured to INPUT (3)or®. Turn
VERT.ATT (J) clockwise to obtainthedesiredsize of
waveform.
(4) Set DISPLAY MODE @ to CH1 - CH2andthe
signal to INPUT ® isdisplayed. At DUAL-Hposition,
signals to INPUTs(3)and ® appear at theleftand
right,andatDUAL-Vpositionthesignalsappearatthe
upanddownpositions.AtX-Yposition,X-Yoperation
is effectedusingsignalsto ® and ® as Y and X axis,
respectively.
15) When the signalvoltage is more.than 10mVand
waveform fails to appear onthe screen, the
oscilloscope maybe checked by feedinginputfrom
CAL 0.6Vp-p © . •
(6) When DC componentismeasured,set AC-GND-DC ©
or © toDCposition.If,inthis case, theDCcomponent
contains pluspotential,thewaveformmovesupward
and ifit containsminuspotential,thewaveformmoves
downward. The referencepoint of"0" potential is
checked atGNDposition.
Triggering operation
Toobservea:stationaryinputsignalwaveform,thesweep
circuit mustbetriggeredcorrectly.Thiscanbeaccomplished
either by inputsignal orby applying a signalwith a specific
relationship (a multiple of integer)withtheinputsignal in
terms of time tothe externaltriggerterminal.The AC
(capacitance) couplingtriggercircuitinputpermitstrigger-
ing by ACcomponentonly; DC componentintriggersignal
is cutoff. When triggersignalisabsent,thesweepcircuit
enters free-runningstate,permitting the check ofGND
level.
When a triggersignal is present,thetriggerpointcan be
determined by LEVEL © forobservationasinthenormal
triggersignal.
9

SLOPE "+" RANGE
+DIRECTION
LEVEL
- DIRECTION
Fig, i
Fig. 6 showstherelationbetweenSLOPEand LEVEL ata trig-
gerpoint.SinceSLOPE is fixed to" + ",the level of trigger
pointcan be setwithin the rangeshown in Fig.6. When the
triggeringlevelexceeds the limit, the sweepcircuitenters
free-runningstatewherethewaveform starts running.
LINE
By settingSOURCE to LINE, the inputsignal canbe syn-
chronizedwith the powersupplyfrequency.Thisfunction
makes it easy to observe a ripple of powersupplyfrequency
contained inthe signal. At thattime, LEVEL can be changed
by LEVEL © .
DUAL
The two channels are automaticallyselected for trigger
sweep and free-runsweep by means of individualsync cir-
cuits, so evenwhen the amplitude,frequency or vertical
position ofone channel is varied, it does not affect the
otherchannel. In dual-traceoperation, LEVEL © func-
tions asa leveladjuster for both CH1andCH2,and both
channels can be synchronized atthe samelevel. In single-
trace operation,only the synccircuit ofthe channelbeing
usedoperates, so sync is effectedwithoutusingSOURCE
Generally,SOURCE © issetto DUALonlywhen
waveform is monitoredwhereobservation of timerelation
between two channels isnot required, or whenobserving
single-trace waveform.
CH1, CH2
When SOURCE © issettoCH1 duringdual-trace or
single-trace operation, the sweepcircuit is drivenusing the
inputsignal of CH1 asa triggersignal. When SOURCE @
is set to CH2,thetriggersignalbecomestheinputsignal of
CH2. With SOURCEset to CH1 or CH2,triggerlevelcan be
beadjusted by TRIG. LEVEL © .
By settingSOURCE to CH1 or CH2, the timerelationbet-
ween two channelscan be observed onthe screen.
EXT
External triggering is accomplished by settingSOURCE
©to EXTposition,provided a triggersignal is applied to
EXT.TRIG © . Use LEVEL © to adjusttriggerlevel in
this case, too. Externaltriggering is usedwhen you wish to
triggerwith a signaldifferentfrom the inputsignal. It
should be noted,however,that the triggersignalmust
have a relationshipwith the inputsignal in terms of time.
Fig. 7 showsthat the sweepcircuit is driven bythe gate
signal when the gatesignal inthe burstsignal is applied to
EXT
JRJQ (jj)_ jnuS/ accuratetriggeringcan be achieved
withoutregard tothe inputsignal fedto INPUTs (3)and
-TRIGGERSIGNAL(GATESIGNAL)
-CH1 (INPUTSIGNAL)
USE OFDUAL-H,DUAL-VANDDUAL-HCH2
.POSITION,
DUAL-H
With DISPLAY MODE @ setto DUAL-H, the signal of
CH1appears atthe lefthalf ofthe scale andthe signal of
CH2 at therighthalf. At thistime,turn o POSITION ©
and both signals ofCMandCH2 will shift tothe left and
right. When DUAL-H CH2 POSITION ® is turned,only
thesignal ofCH2 will shift tothe left and right.Generally,
thestartpoint of CH1isset to theextremeleft of the scale
by <«• POSITION © andthestartpoint ofCH2 setinthe
center ofthe scale by DUAL-H CH2 POSITION ® ,
(waveform is sweptalwaysfromleft to right).Since
DUAL-H mode is used to compare" the amplitude of
waveform,SOURCE ® should be set to DUAL,asstated
in "TriggeringOperation".
DUAL-V
With DISPLAY MODE @ set to DUAL-V, the oscilloscope
functionsjust the same asa dual-traceoscilloscope. Ifitis
required to measure the timerelationbetween two signals
in DUAL-V mode, SOURCE © should besettoCH1or
CH2. Ifnot required, itmaybe set to DUAL.
USE OFPHASEDISPLAYANDPHASE
MEASUREMENT
The oscilloscope is designed for single-trace and dualtrace
operation; it displayssignals of both channels on left and
right orupand downpositions ofthe screenwhereCH1 is
displayed asY axis andCH2asX axis. The dual-trace and
X-Y observations canbe madesimultaneously by using
PHASE DISPLAY. With the PHASEDISPLAYset toONin
X-Y mode,. "zerophaseLissajous'figure(traceinclined
45°fromupperright to lowerleft of thescreen}"whenthe
same waveformwithoutphasedifference is applied toX
and Y axes is displayed. So waveforms of currentphase
difference canbe observed by comparing the Lissajous'
figure dueto signals of both channelswith"zerophase
Lissajous' figure"even onthe highfrequencybandthat
causes a phaseshift inX andY amplifiers.
10
CH2 (OUTPUT SIGNAL!
•Fig, 7