Matrix 620B, 5620NF, 620R, 640B, 620BF User Manual

Oscilloscope

USERMANUAL

DualTraceOscilloscope

MembersOfTheFamily

CONTENTS

1.GENERAL1

1.1Description1

1.2Features1

2.TECHNICALSPECIFICATIONS2

3.PRECAUTIONSBEFOREOPERATINGTHEOSCILLOSCOPE6

3.lUnpackingtheOscilloscope6
32CheckingtheLinevoltage6

3.3Environment7

3.4EquipmentInstallationandOperation7

3.5CRTIntensity7

3.6WithstandingVoltagesofInputTerminals7

4.OPERATIONMETHOD11

4.1IntroductionofFrontPane111

4.215

4.3BasicOperation-SinglechannelOperation16

4.4Dual-ChannelOperation17

4.5ADDOperation18

4.6Triggering18

4.7TIME/divcontrol21

4.8SweepMagnification21

4.9X-YOperation22

4.10CalibrationofProbe23

5.CURSORREADOUTOPERATION24

5.1ReadOutPanel24

5.2Cursormeasurement25

6.MAINTENANCE30

6.1Fusereplacement30

6.2Cleaning30

7.BLOCKDIAGRAM31

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┈┈┈┈IntroductionofRearPane1

PAGE

ⅱ

SAFETYTERMSANDSYMBOLS

Thesetermsmayappearinthismanualorontheproduct:

WARNING.

!

couldresultininjuryorlossoflife.

!

Thefollowingsymbolsmayappearinthismanualorontheproduct:

Warningstatementsidentifyconditionorpracticesthat

.tCAUTION

Cautionstatementsidenifyconditionsorpracticesthat

couldresultindamagetothisproductorotherproperty.

!

DANGERATTENTIONProtectiveEarth(ground)

HighVoltagerefertoManualConductorTerminal

Terminal

ⅲ

1.GENERAL

1.1Description

The620Rfamilyoscilloscopearedual-channeloscilloscopewithmaximumsensitivityoflmV/div.Thetimebaseprovidesa
maximumsweeptimeof0.2uS/div.Whenmagnifiedby10,thesweepspeedis20ns/div.Theverticaldeflectionsystemhas
twoinputchannels.Eachchannelhas12basicdeflectionfactorsfrom5mVt020Vperdivision,itcanexpandedto1mV/div
bypulloutx5MAGbutton.Eachoftheseoscilloscopeemploysa6-inchrectangulartypecathode-raytubewithinternal
graticule.620R/640Rhascursorreadoutfunctionwhichcandisplayvoltage,time,frequencyetc.informationonscreen.
Theseoscilloscopesaresturdy,easytooperateandexhibitshighoperationalreliability.

1.2Features

L)HighintensityCRTwithhighaccelerationvoltage:

TheCRTisahighbeamtransmission,highintensitypewithahighaccelerationvoltageof2KVforand
12KVfor.Itdisplaysclearreadabletracesevenathighsweepspeeds.

640B/650B/640BF/650BF/640R/650R

2)Atriggerlevellockfunctionwhichmakesthetriggeringadjustmentunnecessary.

3)Alternatetriggering:
Evenanobservationoftwowaveformsofdifferentfrequencies,thewaveformoftheeachchannelisstablytriggered.

4)TVsynctriggering:
TheoscilloscopehasasyncseparatorcircuitfortriggeringofTV-VandTV-Hsignals.

5)CHlOutput:
Terminated50ohmoutputofchannel1signalavailableonrearpanelfordrivingfrequencycounterorotherinstruments.

6)Z-AxisInput:

Intensitymodulationcapabilitypermitstimeorfrequencymarkerstobeadded.Traceblankwithpositivesignal,TTL

compatible.

7)X-Yoperation:
SettheswitchtoX-Y.ThentheinstrumentworksasanX-Yoscilloscope.CHlcanbeappliedashorizontaldeflection(X-axis)
whileCH2provideverticaldeflection(Y-axis).

ty BF5620NF/620R

620B/620

1

2.TECHNICALSPECIFICATIONS

MODEL

SPECIFICATIONS

Sensitivity

Sensitivityaccuracy

VernierVerticalsensitivity

Frequencybandwidth

Risetime

Inputimpedance

Linearity

Werticalmodes

Choppingrepetitionfrequency

Inputcoupling

Maximuminputvoltage

Commonmoderejectionratio

Isolationbetweenchannels

(At5mV/DIVrange)

CH1signaloutput

CH2INVBAL.

20MHzOSCILLOSCOPE40MHz/50MHzOSCILLOSCOPE

620B/5620NF/620BF/620R640B/650B/640BF/650BF/640R/650R

5mV~20V/DIV,12stepsin1-2-5sequence(5620NF:5mV-5V/DIV,10stepsin1-2-5sequence)

≤≤3%(x5MAG:5%)(5620NF:Devoid)±±

Continuouslyvariabletol/2.5orlessthanpanel-indicatedvalue.
DC~20MHz(x5MAG:DC~7MHz)DC~4OMHz(x5MAG:DC~15MHz)
ACcoupling:Lowlimitfrequency10Hz.(Withreferenceto100KHz,8DIV.Frequencyresponsewith-3dB)
Approx.17.5nS(x5MAG:Approx.50nS)Approx.8.75nS/8.0nS(x5MAG:Approx.50nS)
Approx.lMohm//Approx.25pF

≤± o0.lDIVofamplitudechangewhenwavefrmof2DIVatgraticulecenterismovedvertically.

CHI:CHlsinglechannel.
CH2:CH2singlechannel.

DUAL:CHIandCH2aredisplayed.ALTorCHOPselectableatanysweeprate.
ADD:CH1+CH2algebraicaddition.
Approx.250KHz
AC,GND,DC
400V(DC+ACpeak),AC:frequencylkHzorlower.
Whensetprobeswitchatl:1,themaximumeffectivereadoutis160Vpp(56Vrmsatsinewave),
orsetprobeswitchat10:1,themaximumeffectivereadoutis400Vpp(140Vrmsatsinewave).

50:1orbetterat50KHzsinusoidalwave.(WhensensitivitiesofandCH2aresetequally)CH1

>1000:lat50KHz
>30:lat15MHz>30:1at35MHZ/45MHz
Atleast20mV/DIVintoa50ohmtermination.Bandwidthis50Hztoatleast5MHz.
Balancedpointvariation:1DIV(Referenceatcentergraticule.)≤

（

10°°

C-35C

Tableone

）

2

SPECIFICATIONS

Triggeringsource

Triggeringmodes

EXTtriggeringsignalinput

Inputimpedance

Max.inputvoltage

Sweeptimeaccuracy

Verniersweeptimecontrol

Sweepmagnification

x10MAGsweeptimeaccuracy

Positionshiftcausedbyxl0MAG

X-Y

MODE

Frequencybandwidth

X-Yphasedifference

MODEL

Coupling

Slope

Sensitivity.

Sweeptime

Linearity

Sensitivity

(Tableonecontinue)

20MHzOSCILLOSCOPE40MHz/50MHzOSCILLOSCOPE

620B/5620NF/620BF/620R640B/650B/640BF/650BF/640R/650R

CH1,CH2,LINE,EXT(CHlandCH2canbeselectedonlywhentheverticalmodeisDUALorADD.

InALTmode,iftheTRIG.ALTswitchispushedin,itcanbeuseforalternatetiggeringoftwodifferentsource.

AC:20Hztofullbandwidth

+/­20Hz~2MHz:1.0DIV;TRIG-ALT:2DIV;EXT:200mV
2~20MHz:1.5DIV

2~20MHz:1.5DIV20-40MHz2.5DIV40~50MHz:3DIV

TRIG-ALT:3DIV,EXT:800mV
TV:Syncpulsemorethanldiv(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

（10

+/-3%

1/2.5ofpanel-indicatedvalue

≤

°°

）

C-35C

10times
+/-5%(20nSec~50nSecareuncalibrated)
+/-5%,xl0MAG:+/-10%(0.2sand1s)



Within2DIV.atCRTscreencenter
Sameasverticalaxis.(X-axis:CHlinputsignal;Y-axis:CH2inputsignal.)
DCtoatleast500KHz

3atDC~50KHz

≤°

3

SPECIFICATIONS

ZAXIS

CALIBEATION

VOLTAGE

CRT

MODEL

Sensitivity

Frequencybandwidth

Inputresistance

Maximuminputvoltage

Waveform

Frequency
Dutyratio

Outputvoltage

Outputimpedance
Type

Phosphor
Accelerationvoltage
Effectivescreensize

Graticule

Tracerotation

20MHzOSCILLOSCOPE

620B/5620NF/620BF/620R

5Vp-p(Positive-goingsignaldecreasesintensity)

Approx.47Kohm

30V(DC+ACpeak,ACfrequency1kHz)≤

Positive-goingsquarewave

6-inchrectangulartype,internalgraticule

Approx.2kVApprox.12kV

8x10div(1div=10mm(0.39in))

Tableonecontinue

40MHz/50MHzOSCILLOSCOPE

640B/65/640BF/0B650BF/640R/650R

DC~2MHz

Approx.1kHz

Within48:52

2Vp-p  2%

Approx,1Kohm

P31

Internal
Provided

4

Cursormeasurementsystem

Cursormeasurement

Function

CURSOR

READOUT
FUNCTION

Cursorresolution
Effectivecursor

Range
Panelsetting

620R/640R/650R

V.1/T.T

P(t,V)
1/25DIV
Vertical:3div±

Horizontal:4div±
Vertical:V/DIV,AC/DC/GND,CH1,CH2,

INV,ALT,CHOP,ADD
Horizontal:TIME/DIV,x10MAG
Trigger:Source,Slope,AUTO,NORM,TV-V/TV-H

Others:probe(x1/x10),X-Y

LinePowerRequirements

Voltage:AC220V/240V10%

(manufactoryset)

Frequency:50Hzor60Hz
Powerconsumption:
Approx..40VA,35W(max.)

±

MechanicalSpecifications

Dimensions:310Wx150Hx455D(mm)

Weight:Approx..8kg(l7.6lbs.)

5

OperatingEnvironment

Indooruse
Altitudeupto2000m
Ambienttemperature:
Tosatisfyspecifications:l0to35C(50to95F)
Maximumoperatingranges:0to40C(32to104F)
Relativehumidity:75%RH(max.)nonCondensing
InstallationCategoryII
Pollutiondegree2

StorageTemperature&Humidity

-10to70C,70%RH(maximum)

Accessories

Powercordl
Usermanual1
Probes2

3.PRECAUTIONSBEFOREOPERATINGTHEOSCILLOSCOPE

3.1UnpackingtheOscilloscope

Theoscilloscopeisshippedfromthefactoryatterbeingful1yinspectedandtested.Uponreceivingtheinstrument,
immediatelyunpackandinspectitforanydamagesthatmighthavebeensustainedduringtransportation.Ifanysignof
damageisfound,immediatelynotifythebearerand/orthedealer.

┈┈┈

┈┈┈

┈┈┈┈┈

3.2CheckingtheLinevoltage

TheseoscilloscopeswilloperateonAC220Vor240Vsettedbymanufatory.BeforeconnectingthepowerplugtoanACline
outlet,makesurethevoltageiscorrectcorrespondingtothelinevoltage.Note:thescilloscopemaybedamagedifitis
connectedtothewrongAClinevoltage.

WARNING.Toavoidelectricalshockthepowercordprotective

!

Replacetherequiredfusesshownbelow.

WARNING.Toavoidpersonalinjudisconnectthepowercord

!

groundingconductormustbeconnectedtoground.

LinevoltageFuse

AC220V250V

AC240V250V

beforeremovingthefuseholder

Range

T0.5A

192~242

T0.5A

216~266

ry,

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.Whensetprobeswitchatl:1,themaximumeffectivereadoutis160Vpp
(56Vrmsatsinewave).Whensetprobeswitchat10:1,themaximumeffectivereadoutis400Vpp(140Vrmsatsinewave).

InputterminalMaximuminputvoltage
CH1,CH2,inputs400VDC+ACpeak
EXTTRLGINinput400VDC+ACpeak
Probeinputs600VDC+ACpeak

（）
（）

（）

ZAXISinput30Vpeak

CAUTION.

donotexceedmaximuminputvoltages.

!

Maximuminputvoltagesmusthave
frequencieslessthan1KHz.

Toavoidinstrumentdamage,

IfanACvoltagewhichissuperimposedonaDCvoltageisapplied,themaximumpeakvalueofCHlandCH2inputvoltages
mustnotexceed+or-300V.SoforACvoltageswithameanvalueofzerovoltthemaximumpeaktopeakvalueis600V.

7

Figure4-1

620R/640R/650RFrontPanel

CAL

2Vp-p

1KHz

INTEN

OSCILLOSCOPE

TRACE

FOCUS

ROTATION

25

26

20

10

uS

5

2

1

.5

.2

UNCAL

VAR

CAL

27

TRIG.ALT

LEVEL

-+

LOCK

x10

POSITION

PULLx5MAG

CH2INV

GND

AC

DC

AUTO

NORM

TV-V
TV-H

SLOPE

20V

35

34

POSITION

VOLTS/DIV

CH1

1M//25pFΩ

X10MAG

X

300V ⅡCAT

MAX.400Vpk

33

!

36

PUSHTRACK

20V

READOUT

INTEN

POWER

32 28

31

READOUT

FUCTIONMENU

HORIZONTAL

TIME/DIV

mS

10
20

50

CAL

VIEWTIME

VAR

POSITION

CAL

PULLx5MAG

ALT

5mV

CHOP

AC
GND
DC

2

5

.1

.2

S

DUAL

30

1

.5

X-Y

VERTICAL

MODE

CH1
CH2

ADD

29

.1.2.5

50

23

24

TRIGGER

MODESOURCE

CH1
CH2

LINE

EXT

TRIGIN

1M//25pFΩ

+

-

VOLTS/DIV

CH2

1M//25pFΩ

!

300V ⅡCAT

MAX.400Vpk

Y

5mV

!

300V

CAT Ⅱ

MAX.

400Vpk

22

12 13

11

1

2

4

3

5

6 7

9

8

10

14 15 16

17

19

18

2021

8

Figure4-2

620B/640B/650B/5620NF/620BF/640BF/650BFFrontPanel

36

35

45

33

30

32 28 27

26

25 24

23

OSCILLOSCOPE

888888

POSITION

1

V

2

5

CH1

TRACE

CAL

INTEN

2Vp-p

1KHz

1

2

FOCUS

3

ROTATION

4

POWER

6 7

1M//25pFΩ

9

8

X10MAG

VOLTS/DIV

.5.2.1

10

20

X

300V ⅡCAT

MAX.400Vpk

HORIZONTAL

SWP.VAR.

50

20

mV

10

5

!

10

CAL

POSITION

PULLx5MAG

AC
GND
DC

11

MHz
KHz

ALT
CHOP

12

mS

10
20

50

VAR

CAL

2

5

.1

.2

S

DUAL

TIME/DIV

1

.5

X-Y

VERTICAL

MODE

CH1
CH2

ADD

13

.1.2.5

50

20

10

uS

5

2

1

.5

.2

x10

UNCAL

VAR

CAL

CH2INV

14 15 16

TRIG.ALT

-+

POSITION

PULLx5MAG

LEVEL

LOCK

17

GND

AC

DC

AUTO

NORM

TV-V
TV-H

TRIGGER

MODE

SLOPE

+

-

1

V

2

5

300V ⅡCAT
MAX.400Vpk

18

VOLTS/DIV

.5.2.1

10

20

!

19

CH1
CH2

LINE

EXT

TRIGIN

1M//25pFΩ

5

CH2

1M//25pFΩ

SOURCE

50

20

mV

10

Y

2021

!

300V

CATⅡ

MAX.

400Vpk

22

9

Figure4-3

620R/640R/650RRearPanel

LINEVOLTAGE

SELECTION

220V

240V

POWERMAX.35WATTS,40VA

!

ENSURETHEPOWERISREMOVEDFROM

THEINSTRUMENTBEFOREREPLACINGTHEFUSE

39

RANGE

(50/60Hz)

198~242

216~264

~

AC

40

FUSE

T0.5A

250V
T0.5A
250V

FUSE

41

Z-AXISINPUT

!

30VpkMAX.

!

CH1OUTPUT

20mV/DIV50

38

37

46

47

H.VARV.VAR

Ω

WARNING

TOAVOIDELECTRICSHOCKTHEPOWERCORDPROTECTIVEGROUNDING
CONDUCTORMUSTBECONNECTEDTOGROUND.
FORCONTINUEDFIREPROTECTION.REPLACEONLYWITHSPECIFIED
TYPEANDRATEDFUSE.
NOOPERATORSERVICEABLECOMPONENTSINSIDE.DONOTREMOVE
COVERS.REFERSERVICINGTOQUALIFIEDPERSONNEL.

!

10

4.OPERATIONMETHOD

4.1IntroductionofFrontPanel

CRT:.

POWER...............................(7)

Mainpowerswitchoftheinstrument.Whenthisswitchisturnedon,theLED(6)isalsoturnedon.

INTEN.................................(2)

Controlsthebrightnessofthespotortrace.

FOCUS................................(3)

Forfocusingthetracetothesharpestimage.

TRACEROTATION..............(4)

Semi-fixedpotentiometerforaligningthehorizontaltraceinparallelwithgraticulelines.

FILTER................................(36)

Filterforeaseofwaveformviewing.

VerticalAxis:

CHl(X)input..........................(9)

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.............................(8)(21)

Selecttheverticalaxissensitivity,from5mV/divto20V/divin12ranges.

11

VARIABLE.......................(13)(17)

Fineadjustmentofsensitivity,withafactorof>1/2.5oftheindicatedvalue.WhenintheCALposition,sensitivityis
calibratedtoindicatedvalue.

POSITION.................(11)(19)

Verticalpositioningcontroloftraceorspot.Whenthisknobispulledout(x5MAGstate),theamplifiersensitivityis
multipliedby5.

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/CHOR...........................(12)

Whenthisswitchisreleasedinthedual-tracemode,thechannellandchannel2inputsarealternatelydisplayed(normally
usedatfastersweepspeeds).
Whenthisswitchisengagedmthedual-tracemode,thechannel1andchannel2inputsarechoppedanddisplayed
simultaneously(normallyusedatslowersweepspeeds).

CH2INV................................(16)

InvertstheCH2inputsignalwhentheCH2INVswitchmodeispushedinThechannel2inputsignalinADDmodeand
thechannel2triggersignalpickoffarealsoinverted.

12

Triggering:

EXTTRIGINinputterminal...............(24)

Inputterminalisusedforexternaltriggeringsignal.Tousethisterminal,setSOURCEswitch(23)totheEXTposition.

SOURCE....................(23)

Selecttheinternaltriggeringsourcesignal,andtheEXTTRIGINinputsignal.
CHl:WhentheVERTMODEswitch(14)issetintheDUALorADDstate,selectCHlfortheinternaltriggeringsource

signal.

CH2:WhentheVERTMODEswitch(14)issetintheDUALorADDstate,selectCH2fortheinternatriggeringsource

Signal.

LINE:ToselecttheACpowerlinefrequencysignalasthetriggeringsignal.

EXT:TheexternalsignalappliedthroughEXTTRIGINinputterminal(24)isusedfortheexternaltriggeringsourcesignal.

SLOPE...................(26)

selectthetriggeringslope.

"+":Triggeringoccurswhenthetriggeringsignalcrossesthelevelinpositive-goingdirection.triggering
"-":Triggeringoccurswhenthesignalcrossesthelinnegative-goingdirection.triggeringtriggeringleve

TRIG.ALT.............(27)

WhentheVERTMODEswitch(14)issetintheDUALorADDstate,andtheSOURCEswitch(23)isselectedatClor
CH2,withtheengagementoftheTRIGALTswitch(27),itwillalternatelyselectCH1&CH2fortheinternaltriggering
sourcesignal.

:

.

LEVEL...................(28)

Todisplayasynchronizedstationarywaveformandsetastartpointforthewaveform.
Toward:s"":Thetriggetinglevelmovesupwardonthedisplaywaveform.
Towards:"-":Thetriggetinglevelmovesdownwardonthedisplaywaveform.

13

LOCK.................................(22)

click(28)byfu11yclockwisepositien,thentriggringlevelisautomaticallymaintainedatoptimumvalueirrespective

Ofthesignalamplitude,requiringnomanualadjustmentoftriggeringlevel.

TRIGGERMODE.......................(25)

Selectthedesiredtriggermode.
AUTO:Whennotriggeringsignalisappliedorwhentriggeringsignalfrequencyislessthan25Hz,sweeprunsin

thefreerunmode.

NORM:Whennotriggeringsignalisapplied,sweepisinareadystateandthetraceisblankedout.Usedprimarily

forobservationofsignalthatfrequencyislessthan25Hz.
TV-V:Thissettingisusedwhenobservingtheentirevertialpictureoftelevisionsignal.
TV-H:Thissettingisusedwhenobservingtheentirehorizontalpictureoftelevisionsignal.

(BothTV-VandTV-Hsynchronizeonlywhenthesynchronizingsignalisnegative.)

H

TimeBase

/V.........................(30)

TIMEDI

Sweeptimerangesareavailablein20stepsfrom0.2us/divto0.5s/div.
X-Y:ThispositionisusedwhenusingtheinstrumentasanX-Yoscilloscope.

SWP.VAR...............................(32)

Verniercontrolofsweeptime.ThiscontrolworksasCALandthesweeptimeiscalibratedtothevalueindicatedby
TIME/divofsweepcanbevariedcontinuouslywhenShaftisoutofCALposition.Thenthecontrolisrotatedinthe

directionofarrowtothefull,theCALstateisproducedandthesweeptimeiscalibratedtothevalueindicatedbyTIME/DIV.

Counterclockwiserotationtothefulldelaysthesweepby2.5timeormore.

'POSITION..........................(35)

Horizontalpositioningcontrolofthetaceorspot.

X10MAG..................................(33)

Whenthebuttonispushedin,amagnificationofl0occurs.

14

Others

CAL..................(1)

Thisterminaldeliversthecalibrationvoltageof2Vp-p,approxlkHz,positivesquarewave.

GND.................(15)

Groundterminalofoscilloscopemainframe.

FAMILY.........(45)

Displayasynchroninzedsignalfrequency(modelshavethisfunctiononly)

4.2IntroductionofRearPanel

ZAXISINPUT..............................(37)

Inputterminalforexternalintensitymodulationsignal.

CH1SIGNALOUTPUT........................(38)

DeliverstheClsignalwithavoltageofapproximately20mVperdivintoa50ohmtermination.Suitablefor
frequencycounting,etc.

STUDS..................................(39)

Forlayingtheoscilloscopeonitsbacktooperateitintheupwardposition.Alsousedtotakeupthepowercord.

ACPowerinputconnector.........(40)

.ACPowerinputsocket.ConnecttheACpowercord(supplied)tothisconnector.

H-

FUSE.............................................(41)

FuseratingisshowninPage6.

15

4.3BasicOperation--Single-channelOperation

BeforeconnectingthepowercordtoanAClineoutlet,makesurethattheworkingvoltageoftheinstrumentiscorrect
correspondtotheAClinevoltage.Settheswitchesandcontrolsoftheintrumentasshownbelow:

ItemNoSetting
INTEN(2)Mid-position
FOCUS(3)Mid-position

VERTMODE(14)Chl
ALT/CHOP(12)Released(ALT)
POWER(7)Disengageposition(OFF)
CH2INV(16)Released

POSITION(11)(19)Mid-position
VOLTS/DIV(8)(21)0.5V/DIV
VARIABLE(13)(17)CAL(clockwiseposition)
AC-GND-DC(10)(18)GND
SOURCE(23)CHl

ItemNo
SLOPE(26)+
TRIG.ALT(27)Released
TRIGGERMODE(25)AUTO
TIME/DIV(30)0.5mSec/DIV
SWP.VER(32)CALposition

POSITION(35)Mid-position
Xl0MAG(33)Released
LEVEL(28)Locked

Setting

Aftersettingtheswitchesandcontrolsasmentioned,connectthepowercordtotheAClineoutlet,andthencontinueasfollows:

1)EngagethePOWERswitchandmakesurethatthepowerLEDisturnedon.Inabout20seconds,atraewillappearonthe
CRTscreen.Ifnotraceappearsinabout60seconds,counterchecktheswitchandcontrolsetting.

2)AdjustthetracetoanappropriatebrightnessandimagewiththeINTENcontrolandFOCUScontrolrespectively.

16

3)AlignthetracewiththehorizontalcenterlineofthegraticulebyadjustingtheCH1POSITIONcontrolandTRACE

ROTATIONcontrol(adjustablebyscrewdriver).

4)ConnecttheprobetotheCH1INPUTterminalandapplythe2Vp-pCALIBRATORsignaltotheprobetip.

5)SettheAC-GNDDCswitchtotheACstate.Awaveformasshowninthefigure44--

WillbedisplayedontheCRTscreen.

6)AjusttheFOCUScontrolsothatthetraceimageappearssharply.d

7)Forsignalviewing,settheVOLTS/DIVswitchandTIME/DIVswitchinappropriate
positionssothatsignalwaveformisdisplayedclearly.

8)AdjustthePOSITIONandPOSITIONcontrolsinappropriatepositionssothatthe
displayedwaveformisalignedwiththegraticuleandvoltage(Vp-p)andperiod(T)canbe

readconveniently.

Theabovearethebasicoperatingproceduresoftheoscilloscope.Itisforsingle-channeloperationwithCH1.Single-channel
operationwithCH2canalsobeachievedinasimilarmanner.Furtheroperationmethodsareexplainedinthesubsequentpages.

Figure4-4

4.4Dual-channelOperation

ChangetheVERTMODEswitchtotheDUALstatessothattrace(CH2)isalso
Displayed(TheexplanationintheproceedingsectionisofCH1).Atd1isstateof
procedure,theCHltraceisthesquarewaveofthecalibratorsignalandtheCH2
traceisastraightlinesincenosignalisappliedtothischannelyet.

NowapplythecalibratorsignaltotheverticalinputterminalofCH2withthe,

probeasisthecaseforCH1.SettheAC-GND-DCswitchtotheACstate.Adjust
verticalPOSITIONknobs(11)and(19)sothatbothchannelsignalsaredisplayed

asshowninFigure4-5

Figure4-5

SignalofCH1

SignalofCH2

17

WhenALT/CHOPswitchisreleased(ALTMODE),theinputsignalsappliedrespectivelytoCHlandCH2appearsonthe

screenalternativelyateachsweep.Thissettingisusedwhenthesweeptimeisshortin2-channelobservation.

WhenALT/CHOPswitchisengaged(CHOPMODE),theinputsignalsappliedtoCH1andCH2areswitchedatabout250kHz
independentofthesweepandatthesametimeappearonthescreen.Thissettingisusedwhenthesweeptimeislongin2-channel
observation.

Wheninthedualchanneloperation(DUALorADDmode),theCHlorCH2signalmustbeselectedforthetriggeringsource
signalbymeansoftheSOURCEswitch.IfbothCHlandCH2signalsareinasynchronizedrelationship,bothwaveformscanbe
displayedstationary;Ifnot,onlythesignalselectedbytheSOURCEswitchcanbestationary.IftheTRIG.ALTpushswitchis
engaged,bothwaveformscanbedisplayedstationary.

4.5ADDOperation

AnalgebraicsumoftheCH1andCH2signalscanbedisplayedonthescreenbysettingtheVERTMODEswitchtotheADD

State.ThedisplayedsignalisthedifferencebetweenCHlandCH2signalsiftheCH2INVpushswitchisengaged.

Foraccurateadditionorsubtraction,itisaprerequisitethatthesensitivitiesofthetwochannelsareadjustedaccuratelyat
thesamevaluebymeansoftheVARIABLEknobs.VerticalpositioningcanbemadewiththePOSITIONknobofeither
channel.Inviewofthelinearityoftheverticalamplifiers,itismostadvantagetosetbothknobsintheirmid-positions.

4.6Triggering

Propertriggeringisessentialforefficientoperationofanoscilloscope.Theusermustbethoroughlyfamiliarwiththe

triggeringfunctionsandprocedures.

(1)FunctionsofMODEswitch:

AUTO:WhentheAUTOswitchisengaged,automaticsweepoperationisselected.inautomaticsweepoperation,thesweep

generatorfreerunstogenerateasweepwithoutatriggersignal.However,itautomaticallyswitchestriggeredsweep
operationifanacceptabletriggersourcesignalispresent.TheAUTOpositionishandywhenfirstsettingupthescope
toobserveawaveform;itprovidessweepforwaveformobservationuntilothercontrolscanproperlyset.Oncethe
controlsareset,operationisoftenswitchenbacktotheNORMtriggeringmode,sinceitAutomatic
sweepmustbeusedforDCmeasurementsansignalsofsuchlowamplitudethattheywillnottriggerthesweep.

ismoresensitive.

18

NORM:TheNORMswitchprovidesnormaltriggeredsweepoperation.Thesweepremainsatrestuntiltheselectedtriggersource

signalcrossesthethresholdlevelsetbytheTRIGLEVELcontrol.Thetriggercausesonesweeptobegenerated,afterwhich
sweepagainremainsatrestuntiltriggered.IntheNORMposition,therewillbenotraceunlessanadequatetriggersignalis
present.IntheALTmodeofdualtraceoperationwithNORMsweepselected,therewillbetraceunlessbothchannel1and2
signalsareadequatefortriggering.

TV-V:SettingtheMODEswitchtotheTV-Vpositionpermitsselectionofverticalsyncpulsesforsweeptriggeringwhen

viewingcompositevideowaveforms.Verticalsyncpulsesareselectedastriggertopermitviewingofverticalfields
andframesofvideo.Asweeptimeof2ms/DIVisappropriateforviewingfieldsofvideoand5ms/DIVforcomplete
frames(twointerlacedfields)ofvideo.

TVH:SettingtheMODEswitchtotheTV-Hpositionpermitsselectionofhorizontalsyncpulsesforsweeptriggeringwhen

-

viewingcompositevideowaveforms.Horizontalsyncpulsesareselectedastriggertopermitviewingofhorizontalfieldsof

video.Asweeptimeofabout10us/DIVisappropriatefordisplayinglinesofvideo.TheSWPVARcontrolcanbesetto

displaytheexactnumberofwaveformsdesired.
Thisoscilloscopesynchronizeswithonly(-)polarity,thatis,thesyncpulsesarenegativeandthevideoispositiveasshownin
Figure4-6.

(2)FunctionsofSOURCEswitch:

Thedisplayedsignalitselforatriggersignalwhichhasatime
relationshipwiththedisplayedsignalisrequiredtobeappliedtothe

triggercircuittodisplayastationarysignalontheCRTscreen.

TheSOURCEswitchisusedforselectingsuchatriggeringsource

.

Figure4-6

CHl/CH2:Theinternaltriggermethodwhichisusedmostcommonly.Thesignalappliedtotheverticalinputterminalis

branchedofffromthepreamplifierandisfedtothetriggercircuitthroughtheVERTMODEswitch.Sincethetriggering
signalisthemeasuredsignalitself,astablewaveformcanbereadilydisplayedontheCRTscreen.WhenintheDUALor
ADDoperation,thesignalselectedbytheSOURCEswitchisusedasthetriggeringsourcesigna1.

19

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,
nosweepwillbedevelopedintheNORMtriggermodebecausethetriggeringthresholdexceedsthepeakamplitudeofthe
syncsignal.

WhentheTRIGSLOPEswitchissettothe(+)position(up),thesweepisdevelopedfromthetriggersourcewaveformasit
crossesthethresholdlevelinapositive-goingdirection.WhentheTRIGSLOPEcontrolissettothe(-)position(down),a
sweeptriggerisdevelopedfromthetriggersourcewaveformasitcrossesthethresholdlevelinanegative-goingdirection.
Thisswitchselectstheslope(polarity)triggeringsignalasshowninFigure4-7.

TRIGLEVELLOCK

Adjustlevel(28)tofullyclockwise,thetriggeringlevelislockedatafixed

Slope

"-"Range

Slope"+"Range

value,andstabletriggeringismadewithoutrequiringleveladjustment.

ThisTriggerlevellockfunctioniseffectivewhenthesignalamplitude
onthescreenortheinputvoltageoftheexternaltriggeringsignaliswithin
thefollowingrange:

620B/5620NF/620BF/620R:640B/650B/640BF/650BF/640R/650R:
50Hz--2MHz:1.0DIV50Hz--20MHz:1.5DIV
2MHz--20MHz:2DIV20MHz--50MHz:3DIV

≥≥

≥≥

Figure4-7

Level

+

-

20

(4)FunctionofTRIGALTswitch:

TheTRIGALTswitchisusedtoselectalternatetriggeringandalternatedisplaywhentheDUAL-traceVERTMODEis
Selected(theswitchhasoneffectintheCH1,CH2,orADDmodes).Inthealternatetriggeringmode(whendual-traceoperation
isselected),thetriggersourcealternatesbetweenchannellandchannel2witheachsweep.Thisisconvenientforchecking
amplitudes,waveshape,orwaveformperiodmeasurements,andevenpermitssimultaneousobservationoftwowaveformswhich

arenotrelatedinfrequencyorperiod.However,thissettingisnotsuitableforphaseortimingcomparisonmeasurements.Forsuch

measurements,bothtracesmustbetriggeredbythesamesyncsignal.

WhentheCHOPandtheTRIGALTswitchesarebothengagedduringdual-traceoperation,synchronizationofthedisplayisnot

possiblebecausethechoppingsignalbecomesthetrigger.UsetheALTmodebyitself,orselectCH1orCH2astriggersource.

4.7TIME/DIVControl

SettheTIME/DIVcontroltodisplaythedesirednumberofcyclesofthewaveform.Iftherearetoomanycyclesdisplayedforgood
resolution,switchtoafastersweepspeed.Ifonlyalineisdisplayed,tryaslowersweepspeed.Whenthesweepspeedisfasterthan
thewaveformbeingobserved,onlypartofitwillbedisplayed,whichmayappearasastraightlineforasquarewaveorpulse
waveform.

4.8SweepMagniftcation

Whenacertainpartofthedisplayedwaveformisneededtobeexpandedtimewise,afaster
sweepspeedmaybeused.However,iftherequiredportionisapartfromthestartingpoint
ofthesweep,therequiredportionmayrunofftheCRTscreen.Insuchacase,pushin

thex10MAGbutton.Whenthishasbeendone,thedisplayedwaveformwillbe
expanded10timestotherightandleftwiththecenterofscreenasthecenterof
expansion.Thesweeptimeduringthemagnificationoperationisasfollows:

(ValueindicatedbyTIME/DIVswitchk1/10

Thus,theunmagnifiedmaximumsweepspeed(lusec/DIV)canbeincreased

withthemagnificationasfollows:

lusec/DIVx1/10=100nsec/DIV

10xmagnification

Anypartcanbecoveredby
meansofPOSITIONcontrol

Figure4-8

21

4.9X-YOperation

Yaxis(CH2)

SettheTIME/divswitchtoX-Yposition.Thentheinstrumentworksasan
X-Yoscilloscope.Eachinputisappliedtotheinstrumentasfollows.

Xaxis

X-axissignal(horizontalaxissignal):CH1INPUT

(CH1)

Y-axissignal(verticalaxissignal):CH2INPUT.

Note:WhenhighfrequencysignalsaredisplayedintheX-Yoperation,pay

Figure4-9

attentiontothefrequencybandwidthsandphasedifferencebetweenXandY-axis.

X-Yoperationpermitstheoscilloscopetoperformmanymeasurementsnotpossiblewithconventionalsweepoperation.The
CRTdisplaybecomesanelectronicgraphoftwoinstantaneousvoltages.Thedisplaymaybeadirectcomparisonofthetwo
voltagessuchasavectorscopedisplayofvideocolorbarpatterns.However,theX-Ymodecanbeusedtographalmostany
dynamiccharacteristicifatransducerisuesdtochangethecharacteristic(frequency,temperature,velocity,etc.)intoavoltage.
Onecommonapplicationisfrequencyresponsemeasurements,wheretheY-axiscorrespondstosignalamplitudeandtheX-axis
correspondstofrequency.

1.SettheTIME/divcontroltotheX-Yposition(fullycounterclockwise).Inthismode,channel1becomestheX-axis
inputandchannel2becomestheY-axisinput.

2.TheXandYpositionsarenowadjustedusingthehorizontalPOSITIONandC2POSITIONcontrolsH

respectively.

3.Adjusttheamountofvertical(Y-axis)deflectionwiththeCH2VOLTS/DIVandVARcontrols.

4.Ajusttheamountofhorizontal(X-axis)deflectionwiththeCHlVOLTS/DIVandVARcontrols.d

22

4.10CalibrationofProbe

Asexplainedpreviously,theprobemakesupawiderangeattenuator.Unlessphasecompensationisproperlydone,the

displayedwaveformisdistortedcausingmeasurementerrors.Therefore,theprobemustbeproperlycompensatedbeforeuse.

Connectthel0:lprobeBNCtotheINPUTterminalofCH1orCh2andsetVOLTS/DIVswitchat50mV.Connectthe
probetiptothecalibrationvoltageoutputterminalandadjustthecompensationtrimmeronprobeforoptimumsquarewave
(minimumovershoot,roundingoffandtilt).

Figure4.10

(a)Correctcompensation

(b)Overcompensation(C)Insufficientcompensation

23

5.CursorReadoutOperation

TheOscilloscopes620R/640Rhasacursormeasurementsystemformakingaccurate,direct-readout
voltage,time,andfrequencymeasurements.Thismethodallowsyoutotakemeasurementsbymovingthe

cursors,whichalwaysappearinpairsandreadingtheirdifferentvaluesfromthedisplayreadout.

5.1ReadOutPanel(seeFig.4-1)

34)PUSH-TRACK:Thispush-tuningbuttonhastwofunctions:tuningandpushbutton.PushthePUSH-TRACKbuttonto
selectmeasurementcursor.Theselectedcursorwillhasa""accompanywithit.Tuningtheknobtoplacethecursorto
whereyouWant.

Horizontalvertical;WhileinP(t,V)mode,Pushingpushbuttontochangemovingdirection,Tuningtheknobto

placethecursor.

31)FUNCTION:Functionselectbutton,WhileinREADOUTONandP(t,V)OFFmode,Brieflypushingthisbuttonto
selectthemeasurementfunctioninthesequenceasbelow:

⊿⊿

⊿

T----1/T----V----T

⊿

T:Timedifferencemeasurement

⊿

1/T:Frequencymeasurement

⊿

V:Voltagedifferencemeasurement

⊿

WhileinP(t,V)ONmode,Pushandtuningthisbuttontoplacethecoordinateand
thepointthatyouwanttomeasure.
WhileinMENUmode,pushthisbuttontochangeparametersstate.
Forinstance:ON/OFF,xl/xl0andQuitfromMenumode.

29)MENUPushMenubuttontoseethemenulistasbelow.Eachtimewhen

thepushbuttonisbriefIypressedthefivemeasurementparameterswillbe

selectedinthesequenceasfollow:

CH1-CH2-P(t,V)-READOUT-QUIT
UseFunctionbuttontochangetheparametersfromx1tox10orONtoOFF.

▽

CH1x1/10
CH2X1/10
P(t,V)ON/OFF
READOUTON/OFF

QUIT

MENU:;FUNCTION:SELECT

Fig.5-1

24

5)READOUTINTEN:Thiscontrolknobisusedforadjustingthereadoutintensity.

5.2.Cursormeasurement

LocationofReadoutparametersanddisplayinformationisillustratedasbelow:

measurement

parameters:

T

⊿

1/T

⊿

⊿V

SLOPE

⊿T=3.000msCH1AUTO

f

Triggersource

TriggerMode
AUTO
NORM
TV-V
TV-H

CH1lnputmode:

AC
DC
GND

AC1VDC1V0.5msALT

CH1VOLTS/divTIME/div

CH2VOLTS/div

ALT/CHOP

Fig.5-2

5.2.1CRTreadoutmeasurement

IntheCRTreadoutmeasurementmode,eachtimewhentheFUNCTIONpushbuttonisbrieflypressedthemeasurement
functionswillbeselectedinthesequenceasfollows:

T---l/T---V--T

⊿⊿⊿⊿----

SetthepanelcontrolVOLTS/divandTIME/divatreasonablepositionandmakesuretheREADOUTparameterinMENU
isON.(DefaultisONwhenpoweron.)

25

5.2.1.1Tmeasurement(SeeFig.5-3)

⊿

a.RepeatpushingFunctionbuttontillTappearedontheUp-Left

cornerofCRTaccompanywithtwoverticaldashbar.

b.TuningPUSH-TRACKknobplacethecursor-1(markedby)to

⊿

▽

⊿T=600.0us

f

CH1AUTO

thestartpointofwaveformthatyouwanttomeasure.

c.PushPUSH-TRACKpushbuttontoselectcursor-2

(cursor-2markedbythistime)

▽

d.TuningPUSH-TRACKknobplacecursor-2totheendpointof

waveform.readtheTvaluedisplayedonCRT.

NOTE:IftheSWEEPVARYisunlocked(TIME/divisun-calibrated),
itwilldisplaya">"beforevalueofTIME/div,thentheTrepresent
thedifferencedivvaluebetweencursor-1andcursor-2.

5.2.1.2.1/Tmeasurement(SeeFig.5-4)

SameasTmeasurement,butCRTdisplayl/TinsteadofT

⊿

⊿⊿⊿

⊿

⊿

1/T=1.667KHz⊿

1V

Fig.5-3

1MS

Cursor2Cursor1

f

CH1

bypushFUNCTIONbutton
NOTE:IftheSWEEPVARYisunlocked(TIME/divisun-calibrated),

thenthel/Tmeansnothing,CRTwilldisplayl/T=?
Ifcursor-1andcursor-2overlapped,T=0,thenthevalueof

⊿⊿

l/Tisgoingtobeinfinite.CRTdisplay1/T=?

⊿⊿

⊿

5.2.1.3.Vmeasurement(SeeFig.5-5)

a.RepeatpushFunctionbuttontillVappearedontheUp-leftcornerofCRT,accompanywithtwohorizontaldashbar.
b.TuningPUSH-TRACKknobtoplacethecursorl(markedby)tothestartpointofwaveformthatyouwantmeasure

⊿

⊿

▽

Fig.5-4

voltagedifference.

c.PushPUSH-TRACKpushbuttontoselectcursor2(cursor-2markedby)

▽

26

d.TuningPUSH-TRACKknobtoplacecursor2totheendpointofwaveform.readtheVvaluedisplayedonCRT.
e.PushPUSH-TRACKagaintoselectcursorlandcursor2(Bothofthemmarkedby)tuningPUSH-TRACKknob

PlacetwocursortotheareawhereyouwantmeasuretheVoltagedifference.

Note:1)Wheninsinglechannelmode,VrepresentasV1orV2dependsonwhichchannelwasbeselected.

2)Whenworkingindoublechannelmode,VislockedonV1only.

NOTE:WhentheVOLTS/divcontrolsareun-calibratedsetting,theVmeasurementvalueswillbedisplayedwith

divisions.Thereisa">"justbeforevalueofVOLTS/div.

WhentheverticalmodeissettotheADDmode,iftheCHlandCH2VOLTS/div
controlaresettodifferentscales,themeasurementresultshavenoactual

meaning,itwilldisplayV=?

V1=8.000V

f

CH1AUTO

5.2.2MenuUse(Fig.5-6)

5.2.2.1Settheprobeattenuationrate

a,PushMenukeytoseemenulist
b,PushMenukeyagaintoselectchannel.
c,UseFUNCTIONpushbuttontosettheattenuationrate
d,PushMENUkeytoQUIT,pressFUNCTIONpushbuttonquitthemenu.

AC2V 5ms

Fig.5-5

Cursor-1

Cursor-2

5.2.2.2READOUTON/OFF

a,PushMenuKeytoseemenulist
b,PushMenuKeytoselectREADOUTON/OFFoption.
c,PressFUNCTIONpushbuttontoselectREADOUTONorOFF(Defaultison)

CH1x1/10
CH2x1/10
P(t,V)ON/OFF

READOUTON/OFF

QUIT

d,PushMENUkeytoQUIT,pressFUNCTIONpushbuttonquitthemenu.

MENU:;FUNCTION:SELECT

NOTE:WhenREADOUTisOFF,onlyhaveVOLTS/divofCH1/CH2and
AC,GND,DCisdisplayed.Allotherinformationisturnoff.

Fig.5-6

27

5.2.3P(t,v)measurement (Fig.5- 7)

a.PushMENUkeyentermenulistmode
b.PushMENUkeytoP(t,V)ON/OFFoption
c.PushFUNCTIONbuttonturnP(t,V)ON
d.PushMENUkeytoQUIT,PushFUNCTIONbuttonquitthemenumode.
e.Acrosswitharrow""displayedonCRT,itrepresentthecursormovementdirection.""meanshorizontal;

""meansvertical.PushPUSH-TRACKbuttonchangemovedirection.TuningPUSH-TRACKtoplacethecursortowhere
youwant.PushFUNCTIONbutton,themarkerchangedto"+".Thispointhasbeendefinedascoordinateorigin.Allthe
followingmeasurementwilltakethispointasreference.

P(300.0us.0.000V)P(300.0us.2V)

AC2V

.

f.Aftersetupcoordinateorigin,TuningPUSH-TRACKknobtoplacecursortothepointofmeasurewaveform,then

theP(t,V)displayedontheUp-left

corner,

AC2VAC1V0.5ms

Fig.5 · 7

g.AfterfinishedP(t,V)measurement,PushMENUtoP(t,Y)ON/OFFoption.
h.PushFUNCTIONbuttontoturnP(t,V)OFF,
i.PushMENUbuttontoQUIT,thenPushFUNCTIONquitofMenulist.

28

5.2.4Frequencymeasurement

620R/640R/650R

bottom-right

1.Incaseofconfusedresults,setTRIGALT(27)atoutposition.

2.SingleChannel:
SettheVertMODE(14)toCH1orCH2,thensetTriggersource(23)totherelatedposition.TuningTriggerLevelknobuntil

onestableandsynchronizedwaveformdisplayedonthescreen,thenthefrequencyvalueofflorf2thatappearedonthe
bottomofrightcorner.

3.Doublechannel:

SettheVertMODE(14)toDUAL,thensetTriggerSource(23)torelatedposition,TuningTriggerLevelknobuntilreceive
onestableandsynchronizedwaveform,thenthevalueofflorf2appearedonthebottomofrightcorneristhemeasured
frequency.

4.Line

SetTriggerSource(23)toLINE,thefrequencywillrepresentasfL.

5.ExternalSynchronizesignal:

SetTriggerSource(23)toEXT,thefrequencywillrepresentasfE.

6.Frequencymeasurementrange:

2OHz~20MHz(5620NF/620BF/620R)

2OHz~40MHz(640BF/650BF/640R/650R)

NOTE:Asthemagneticfieldeffecting,CRTreadoutcharactersmaymoveoutofscreen,inthisstationthereadoutposition

Adjustabovetwopotentiometersmovethereadoutcharacterstothescreencenter.Thesetwopotentiometerlocatedonthe
CRTreadoutboard.

corner.

frequency,

adjustmentisrequired.
47V.VARVerticaladjusting;
46H.VARHorizontaladjusting

hasbuiltinfrequencyaccount,itcanreadfrequencydirectly.Thevalueoffrequencydisplayedinthe

“”

29

6.MAINTENANCE

WARNING

Thefollowinginstructionsareforusebyqualifiedpersonnelonly.Toavoidelectricalshock,donotperformanyservicing
otherthanintheoperatinginstructionsunlessyouarequalifiedtodoso.

6.1FuseReplacement

Ifthefuseblows,thepowerlampindicatorswillnotlightandtheoscilloscopewillnotoperate.Thefuseshouldnotnormally

openunlessaproblemhasdevelopedintheunit.Trytodetermineandcorrectthecauseoftheblownfuse.Therep1aceonlywithafuseofthe
correctratingandtype(seepage6)

Thefuseislocatedontherearpanel(seefig.4-3).

!

6.2Cleaning

Tocleantheoscilloscope,useasoftclothdampenedinasolutionofmilddetergentandwater.Donotspraycleanerdirectlyon
totheoscilloscopebecauseitmayleakintothecabinetandcausedamage.
Donotusechemicalscontainingbenzine,benzene,toluene,xylene,acetone,orsimilarsolvents.
Donotuseabrasivecleanersonanyportionoftheoscilloscope.

thespecifiedtypeandrating,anddisconnectpowercordbeforereplacingfuse.

WARNING

.Forcontinuedfireprotection.Replacefuseonlywith250Vfuseof

30

7.BLOCKDIAGRAM

CH1(X)

INPUT

CH2(Y)
INPUT

CH1
CH2

EXT

LINE

CH1ATT

CH2ATT

CH1SIGNAL

ONTPUT

CH1

PREAMP

CH1
TRIG(X-AXIS)
PICKUPAMP

CH2

PREAMP

CH2

TRIGPICKUPAMP

TRIGGERINPUT

AMP

LINETRIG

VERT
SIGNAL

SWITCHING

TRIG
SIGNAL

TRIGSWITCH

X-AXISSIGNAL

TRIGGER

GENERATOR

AUTOCIRCUIT

VERTICAL

MODESWITCH

LOGIC

Z-AXIS
INPUT

(A)SWEEP

GENERATOR

FREERUN
SIGNAL

VERTICAL

OUTPUTAMP

Z-AXIS

AMP

SQUARE-WAVE

CRTCIRCUIT

H.V.SUPPLY

HORIZONTAL
SWITCHING

TOEACH

BLOCK

2Vp-p/1KHz

HORIZONTAL
OUTPUTAMP

POWERSUPPLY

CALIBRATOR

-H.V.

620B
620R
+12KV

ACLINE

50/60Hz

31

Specificationsaresubjecttochangewithoutnotice.

32