Tektronix 2445B User manual

Tektronix
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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
of 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.
Copyright ■!■ Tektronix,Inc.,1988

WARRANTY
Tektronixwarrantsthatthisproductwillbefreefromdefectsinmaterialsand
workmanshipforaperiodof three (3)yearsfromthedateofshipment.Ifanysuch
productprovesdefectiveduringthiswarranty period, Tektronix,atits option, either
willrepairthedefectiveproductwithoutchargeforpartsand labor, or wiii providea
replacementinexchangeforthedefectiveproduct.
Inorder to obtainserviceunderthiswarranty,CustomermustnotifyTektronixofthe
defectbeforetheexpirationofthewarrantyperiodandmakesuitable
arrangementsfortheperformanceofservice.Customershallberesponsiblefor
packagingandshippingthedefectiveproducttotheservicecenterdesignatedby
Tektronix,withshippingchargesprepaid.Tektronixshallpayforthereturnofthe
producttoCustomerif the shipment is toalocationwithinthecountryinwhichthe
Tektronixservicecenterislocated.Customershallberesponsibleforpayingall
shippingcharges,duties,taxes,andanyotherchargesforproductsreturnedto
anyotherlocations.
Thiswarrantyshallnotapplytoanydefect,failureordamagecausedbyimproper
useorimproperorinadequatemaintenanceandcare.Tektronixshallnotbe
obligatedtofurnishserviceunderthiswarranty a) 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 OF 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. 1 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 1 MfL
Channels3 and4 give0.1V or0.5V perdivision,with1 MHinputresistance,andDC
coupling. Withthestandard10Xprobes,channels1 and2 display20mVto50
V/divisionandchannels3 and4 display 1 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 WR addsa WordRecognizerProbeconnectorontherearpanel.The TV
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