Tektronix 2445B Manual de usuario

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2445B/2455B/2465B

OscilloscopeandOptions

OperatorManual

070-6860-00

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Tektronix

2445B/2455B/2465B

OscilloscopeandOptions

OperatorManual

070-6860-00

Pleasecheckforchangeinformationattherear

this

manual.

FirstPrinting:May1988

RevisedPrinting:October1990

InstrumentSerialNumbers

EachinstrumentmanufacturedbyTektronixhasa serialnumberona panel

insertortag,orstampedonthechassis.Thefirstletterintheserialnumber

designatesthecountryofmanufacture.Thelastfivedigitsoftheserialnumber

areassignedsequentiallyandareuniquetoeachinstrument.Those

manufacturedintheUnitedStateshavesixuniquedigits.Thecountryof

manufactureisidentifiedasfollows:

B010000Tektronix,Inc.,Beaverton,Oregon,USA

E200000TektronixUnitedKingdom,Ltd.,London

J300000Sony/Tektronix,Japan

H700000TektronixHolland,NV,Heerenveen,TheNetherlands

InstrumentsmanufacturedforTektronixbyexternalvendorsoutsidetheUnited

Statesareassigneda twodigitalphacodetoidentifythecountryofmanufacture

(e.g.,

JPforJapan,HKforHongKong,ILforIsrael,etc.).

Tektronix,Inc.,P.O.Box500,Beaverton,OR97077

Printedin

U.S.A.

■!■

Tektronix,Inc.,1988

WARRANTY

Tektronixwarrantsthatthisproductwillbefreefromdefectsinmaterialsand

workmanshipforaperiodof

three

(3)yearsfromthedateofshipment.Ifanysuch

productprovesdefectiveduringthiswarranty

period,

Tektronix,atits

option,

either

willrepairthedefectiveproductwithoutchargeforpartsand

labor,

wiii

providea

replacementinexchangeforthedefectiveproduct.

Inorder

obtainserviceunderthiswarranty,CustomermustnotifyTektronixofthe

defectbeforetheexpirationofthewarrantyperiodandmakesuitable

arrangementsfortheperformanceofservice.Customershallberesponsiblefor

packagingandshippingthedefectiveproducttotheservicecenterdesignatedby

Tektronix,withshippingchargesprepaid.Tektronixshallpayforthereturnofthe

producttoCustomerif

the

shipment

toalocationwithinthecountryinwhichthe

Tektronixservicecenterislocated.Customershallberesponsibleforpayingall

shippingcharges,duties,taxes,andanyotherchargesforproductsreturnedto

anyotherlocations.

Thiswarrantyshallnotapplytoanydefect,failureordamagecausedbyimproper

useorimproperorinadequatemaintenanceandcare.Tektronixshallnotbe

obligatedtofurnishserviceunderthiswarranty

torepairdamageresultingfrom

attemptsbypersonnelotherthanTektronixrepresentativestoinstall,repairor

servicetheproduct;b)torepairdamageresultingfromimproperuseorconnection

toincompatibleequipment;orc)toservicea productthathasbeenmodifiedor

integratedwithotherproductswhentheeffectofsuchmodificationorintegration

increasesthetimeordifficultyofservicingtheproduct.

THISWARRANTYISGIVENBYTEKTRONIXWITHRESPECTTOTHIS

PRODUCTINLIEUOFANYOTHERWARRANTIES,EXPRESSEDOR

IMPLIED.TEKTRONIXANDITSVENDORSDISCLAIMANYIMPLIED

WARRANTIESOFMERCHANTABILITYORFITNESSFORA PARTICULAR

PURPOSE.TEKTRONIX'RESPONSIBILITYTOREPAIRORREPLACE

DEFECTIVEPRODUCTSISTHESOLEANDEXCLUSIVEREMEDYPROVIDED

TOTHECUSTOMERFORBREACHOFTHISWARRANTYTEKTRONIXAND

ITSVENDORSWILLNOTBELIABLEFORANYINDIRECT,SPECIAL,

INCIDENTAL,ORCONSEQUENTIALDAMAGESIRRESPECTIVEOF

WHETHERTEKTRONIXORTHEVENDORHASADVANCENOTICEOFTHE

POSSIBILITY

SUCHDAMAGES.

CertificateoftheManufacturer^lmporter

Weherebycertifythatthe.

2465B/2455B/2445BOSCILLOSCOPEANDALLINSTALLEDOPTIONS

complieswiththeRFInterferenceSuppressionrequirementsof

Amtsbl.-Vfg1046/1984.

TheGermanPostalServicewasnotifiedthattheequipmentisbeing

marketed.

TheGermanPostalServicehastherighttore-testtheseriesandto

verifythatitcomplies.

TEKTRONIX

BescheinigungdesHerstellers/lmporteurs

Hiermitwirdbescheinigt,da#der/die/das

2465B/2455B/2445BOSCILLOSCOPEANDALLINSTALLEDOPTIONS

inUbereinstimmungmitdenBestimmungenderAmtsblatt-Verfugung

1046/1984funkentstoYtist.

DerDeutschenBundespostwurdedasInverkehrbringendiesesGerates

angezeigtunddieBerechtigungzurUberprufungderSerieaufEinhalten

derBestimmungeneingeraumt.

TEKTRONIX

NOTICEtotheuser/operator:

TheGermanPostalServicerequiresthatSystemsassembledbythe

operator/userofthisinstrumentmustalsocomplywithPostal

Regulation,Vfg.1046/1984,Par.2,Sect.1.

HINWEISfurdenBenutzer/Betreiber:

DievomBetreiberzusammengestellteAnlage,innerhalbdererdies

Gerateingesetzt

wird,

mu/3

ebenfallsdenVoraussetzungennachPar.2,

Ziff.

derVfg.1046/1984genugen.

NOTICEtotheuser/operator:

TheGermanPostalServicerequiresthatthisequipment,whenusedina

testsetup,mayonlybeoperatediftherequirementsofPostal

Regulation,Vfg.1046/1984,Par.2,Sect.1.7.1arecomplied

with.

HINWEISfurdenBenutzer/Betreiber:

DiesGeratdarfinMeflaufbautennurbetriebenwerden,wenndie

VoraussetzungendesPar.2,

Ziff.

1.7.1derVfg.1046/1984eingehalten

werden.

The

2465B, 2455B,

and 2445B

TheTEKTRONIX2465B,2455B,and2445Bportableoscilloscopeshavefourvertical

channelswithDCto400MHz,250MHz,and150MHzbandwidths.Deflectionfactors

runfrom2 mVto5 V perdivision,ina 1-2-5sequence,witheither1 MHor50Cl input

resistance,inchannels1 and2.EitherACorDCinputcouplingisavailableat

MfL

Channels3 and4 give0.1V or0.5V perdivision,with1 MHinputresistance,andDC

coupling.

Withthestandard10Xprobes,channels1 and2 display20mVto50

V/divisionandchannels3 and4 display

V or5 V/division.

Thetriggersystemworksautomaticallyformostsignals.Theyoperateinvarious

modes,fromanychannel,withoptimumcouplingsfora widerangeofsignals.The

2445BtriggersfromDCto250MHz.The2455Band2465BtriggerfromDCto

500 MHz.

Sweepspeedsrangefrom1.5s to1 nsperdivisiononthe2445Band2455Bandto

500psperdivisiononthe2465B,includingtheeffectsoftheX10magnifierandthe

calibratedvariablebetween1-2-5steps.HorizontaldisplaysincludeA-Sweep,

B-Sweep(delayed),A alternatedwithB,andCH1 (forX/Ydisplays).

TheSETUPfeatures.AUTO,SAVE,andRECALL,savetimeandpreventerrors.

whetheryouarea noviceoperatorora master.AUTOSetupworkswithalmostany

signal.

Forrepeatingmeasurements,theSaveandRecallfunctionsrecordandrestore

asmanyas30instrumentsetups,includingtheextended-functionoptions.Setupscan

berecalledeitherimmediatelyorsequentially.

Digitalreadoutsoftime,voltage,scalefactors,triggerlevels,andauxiliaryinformation

alsosavetimeandreduceerrors.

WithParametricMeasurements,commonmeasurementssuchasfrequency,period,

amplitude,pulsewidth,dutyfactor,risetime,falltime,andpropagationdelaycanbe

madeautomatically.EachmeasurementactivationdisplaystheresultsintheCRT

readout.Measurementresultsremainon-screenuntilanyotherbuttonispressed.

ForinstrumentswithserialnumbersB049999andbelowwithfirmwareVersion

11andaboveorforinstrumentsserialnumbersB050000andabovewithfirmware

Version2 andabovethefollowingfunctionisavailable.TheRECALLbuttonresets

theinstrumentintothemodeofoperationitwasinpriortoperformingtheparametric

measurementorAUTOSetup.

WiththeavailableCounter/Timer/Trigger(CTT),Option06orOption09,

measurementsrequireevenlesseffortandgivebetteraccuracy.TheCTT increases

triggerselectivity,especiallyindigitalsystems.Option09includestheCTTanda 17-bit

WordRecognizer

{WR).

TheavailableTelevisionA/ideo(TV)enhancement,Option05,can

triggeratanydesiredpointina frameanditcanreducetheeffectsofaccouplingand

humina videosignal.TheavailableDigitalMultimeter(DMM)measuresdcvoltage,dc

current,acrmscurrent,resistance,andtemperaturewithfloatinginputs.

2465B/2455B/2445BOperators

The 2465B, 2455B, and 2445B

The

addsa WordRecognizerProbeconnectorontherearpanel.The

enhancementaddsLINES,FLD1,andFLD2TriggerCoupling.

TheavailableGPIBinterfaceaccessesallcontrolsanddigitalreadings.Theinterface

addsGPIBstatusindicators,justabovetheCRT.Seethe24X5B/2467B GPIB (Option 10)

Instrument Interfacing Guide forinformationonintegratingtheinstrumentinto a GPIB

system.

The2465BCTincludesC7TandWR (Option9)andGPIB(Option10).The

2465BDMaddsDMM (Option01)andalsoincludesCTT andWR(Option9)andGPIB

(Option10).The2465BDVaddsTV(Option05)tothefeaturesofthe2465BDM.

Illustrationsatthebackofthemanualshowtheinstrumentfrontandrearpanels.

2465B/2455B/2445BOperators

Page

Prefacei

Illustrationsvi

Tablesvii

OperatorsSafetySummaryviii

"jGenera! Information

PreparationforUse1-1

Safety1-1

LineVoltageSelection1-1

LineFuse1-1

PowerCord1-3

InstrumentCooling1-4

Start-up1-4

RepackagingForShipment1-5

2Operation

Fundamentals2-1

ParametricMeasurements2-1

Gettinga Display2-2

AssigningParametricMeasurementstoAutoSetup2-3

Vertical2-4

Horizontal2-6

TriggerControls2-6

VideoTriggering2-9

Readout2-10

MeasurementswithCursors2-13

VoltageMeasurements2-15

DisplayOperation2-15

SignalConnections2-16

MagnifyWaveformDetailswithDelayed-Sweep2-17

B-Trigger

Operation2-18

Delta-Delay-Time2-19

Single-Delay-TimeMeasurements2-20

TimeIntervalMeasurement2-21

PrecisionTiming2-22

TriggeredDelta-Delay-TimeMeasurements2-23

TimeIntervalResolution2-25

MeasurementUpdating2-25

Frequency,Period,andTotalizeCounting2-27

FrequencyMeasurementwithExternalReference(Option1E)2-28

DelaySweepsbyEventCounts2-28

LogicTriggering2-32

WordRecognizerOperation2-34

TheWordOutSignal2-35

FrequencyLimitforAutoLevelorParametricMeasurements2-35

DMM\ 2-35

SaveandRecallOperation2-36

2465B/2455B/2445BOperatorsiii

Contents

3Applications

Peak-to-PeakVoltage3-1

AbsoluteVoltagesUsingCursors3-1

NoiseImmunity3-2

DCVoltageMeasurement3-3

AmplitudeModulation3-3

FrequencyModulation3-4

MeasuringVideoSignalsinIREUnits3-5

AvoidingFalseDisplayswithMulti-ModeSignals3-5

AlgebraicAdditiontoDetectCoincidenceorCancelInterference3-5

ObservingCoincidenceofDigitalSignals3-6

MeasuringOff-GroundSignalsAndCancellingInterference3-6

PeriodandFrequency3-8

RiseTimeandFallTime3-9

PropagationDelay3-11

SetupandHoldTimes3-12

SlewRate3-13

TimeRatio(DutyFactor)3-13

PhaseDifferenceBetweenTwoSignals3-15

MeasuringMillivoltSignals3-17

4Checks and Adjustments

Introduction4-1

InitialSetup4-1

TraceRotationandAdjustment4-2

AstigmatismAdjustment4-2

AutoDCBalanceRoutine4-3

ProbeCompensation4-4

MatchingChannel2 Delay4-5

AmplitudeCheck4-6

TimingCheck4-7

QControls, Connectors, and Indicators

Introduction5-1

PowerAndDisplay5-1

SetupandVertical5-4

Horizontal5-12

DelayandDeltaControls5-15

RearPanel5-27

DMM5-29

DMMDisplays5-33

Display-ModeInteractions5-33

iv2465B/2455B/2445BOperators

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