101 | Tektronix 494AP specs

o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o a o o o

ROW
X1	Y1	00
X1	Y2	01
X1	Y3	02
x1	Y4	03
X1	Y5	04
X1	Y6	05
X1	Y7	06
xl	Y8	07
x1	Y9	08
X1	Yl0	09
,<2	Y1	OA
,<2	Y2	OB
x2	Y3	0c
x2	Y4	OD
><2	Y5	OE
x2	Y6	OF
x2	Y7	1 0
)<2	Y8	1 1
x2	Y9	1 2
x3		1 3
x3	Y1
x3	Y2
x3	Y3
x3	Y4
x3	Y5
x3	Y6
X3	Y7
x3	Y8	2F
X3	Y9	1 C
x3	Y l 0	1 D
x4	Y1	1 E
x4	Y2	1 F
X4	Y3	u
x4	Y4	21
x4	Y5	1 8
x4	Y6	29
X4	Y7	2A
x4	Y8	25
x4	Y9	26
x4 Y 1 0 1 B
X5	Y1	28
X5	Y2	29
x5	Y3	28
X5	Y4	30
X5	Y5	2C
x5	Y6	24
x5	Y7	20
X5	Y8	27
x5	Y9	2E
X5	Yl0	31

Theoryof Operation- 494A1494ApSewice, Vot. .t

Table 7-24

FRONTPANELSWTTCHMATRTXCODE/FUNCTONTABLE

DATA

ENTRY

20 ps TIME/DIV

50 ps TIME/DIV

0.1ms TIME/DV

0.2ms TIME/DIV

0.5ms TtME/DV 1 ms TIME/DV 2 ms TME/DV 5 ms TIMEIDV 10 ms TIME/DV 20 ms TIMEIDV 50 ms TIME/DIV

0.1s TIME/DV

0.2s TIME/DIV

0.5s TIME/DIV

1 s nME/DtV

2 s TIME/OV

5 s TIME/DV

AUTO

MNL

EXT

	EXTTRIGGER	RUN/STOP	ASSIGN2
	SINGLESWP	RESET	SIGNALTRACK
	SAVEA	(Selectplotter)	2
	2 dBl		2
	2 dBl		4
	B-SAVEA	(PlotterB-A offsetentry)	4
	B-SAVEA	(PlotterB-A offsetentry)	3
	10 dB/	(Disablecorrections)	3
	10 dB/	(Disablecorrections)	7
	<Green> SHIFT	(Greenshift/	7
	<Green> SHIFT	(Greenshift/	(Greenshift cancel)
	MAXSPAN	Blueshiftcancel)
	MAXSPAN	REFLVLENTRY	kHz/-dBX
	- STEP		STEPSIZE
	FINE		STEPSIZE
	FINE	CAL	MKR * REFLVL
	INTTRIG	BASELINE	BW MODE
	FREERUN	CLIP	BW MODE
	FREERUN	STEPENTRY	PEAKFIND
	NARROW		5
	LIN	(Calfactordisplay)	5
	LIN		1
	VIEWB		1
	VIEWB	RECALL(display)	6
	WIDE	(Special	6
	WIDE	(Special	I
	ZEROSPAN	ModesMenu)	I
	ZEROSPAN	dB/Dtv	HzldB
	AUTORES	SPANiDTV	HzldB
	AUTORES		MHz/+dBX
	+ STEP		MHz/+dBX
	+ STEP		MKR1 +2
	MrNNOTSE/DISTORTONREFLEVEL		dBlHz
	HELP	UNITS	dBlHz
	HELP	(Blueshifthelp)	(Greenshift hetp)
	GRATILLUM	READOUT	A MKR
	MAX HOLD	(Displayerrors)
	PULSESTRETCHER	(Diagnosticmenu)
	MARKER	FREQSTARTSTOP	MKR STARTSTOP
	MENU	FREQSTARTSTOP	MKR STARTSTOP
	VIEWA	STOREDISP
	<Blue> SHTFT	(Blue	(Blueshift/
		shiftcancel)	(Blueshift/
	IDENT	FREQ	Greenshiftcancel)
	IDENT	FREQ
	TUNECF/MKR	MKROFF
	75f,}a

o o o o

e Option 07 onty.

7-101

Image 293

Tektronix 494AP service manual 101

Contents

Tektronix Page Releaseof Copyright O o o o o o o o a o O o o o o o o o o O o o o o O oO a a o o o O a o o A a a a a O o WarrantyO o o o o A a a a A o a o o a o o A o 494A/494APServiceVot.1O o A o o A o o o o o o oO a o o o a o O o o o o o o 494A/494APservice Manuatis divided into two volumesO a O o o CONTENTSGonr O a o o o O a o o o A a o o o a o o O o tO o a o o o O o o o o o O o a o A o o o o o O o o o a o PowersupplyA o RAM 494A/94APServiceVot.1 VOLUME2 O t O o o o494A/494APServlceVol Preselector P3035on theVideoProcessorboard Rejection 494A/494APServtceVot.1 A o O oO o o Basicblockdiagramof a -rNsynthesizer Simplifiedschematicof harmonicmixer494A/494APServlceVot Simplifieddigital-to-analog Converter O o a o O a oO o o SpEctFtcATloNs 944/494AP Service VotOptions 22 Waveguide MtxERSCHARACTERTSTTCS O o o o Do Not ServiceAloneO a o This Manual O a o o o Sedon 1 4g4l494Ap Servlce,Vol A o o o o Value. O a O o O o o oSEL WM 49OV Mlxer 18to 26.5to 33 to 490U 40 toWM 490E 490W 10to 170GHz O o A o O o o o Electricalcharacteristics O o a o o o o A o o o a +tAF. x BEF + 20 + 4NHz Freouencyrelatedcharacteristics Normal Accuracyand Ldentical Resolution Characteristic Performance UirementResolution FrequencySpan/Div OverallRange MinimumSpan/Div KHz 300 Hz 30 Hz 3Hz Typically 30 psldivision of pulse tude Freq Freouency RelatedcharacteristicsE o o 33-s0GHz O o a eO a o s Accuracy Steps 10 dB/divLogMode ReferenceLevel SEt With Data ENTRYpush Buttons Accuracy Normal or Delta ModeDisplayDynamicRange Accuracy RF Attenuatol Range Accuracy Dcto 1 GHz Performancq Requirement Delta a Mode provides differentialDecadeTransitions 100 DBc Amplitude C oA07-100 Externalmixer Inputsignalcharacteristics O o o a O a o e J104 ACCESSORy Pin4 Pin5 Speclfication- 494Al4g4ApService,Vol1stLO OUTPUTpower UalrbratorcAL ouT Teristics Outputsignalcharacteristics Line O a o o Temperature Operatingand Humidity Speclfication- 494A1494APService,Vot.1CE03-15 kHzto 50 MHzpowerleads CS02-50 KHz to 400 MHz power F u l l l i m i t Leads SrDEvtEw O o o o o o o15.05 28.85inches232x 392x 732.gmm O c o A a o o Unpackingand INITIALINSPECT6N 494A1494ApService,VotO a o o o o o a o o A o a o o o PowerSourceand power Requirements ConnectingpowerInstallation- 494A/494ApServlce,Vol O o o A o o o o o o o O o o o o a o O o a o o o o o o O o o o o o o O o a o o o O o o o o o o o O c o O a o o O o o o o o o o o o o o o o o o o o o Secton 4g4Al494ApServiceVol Eouipmentreouired O o o o o o o o o o o o o o o o oO o o o o o Accuracy*0.2s dB io O o o o o o o o o o o o o o o o o o o oLodB/soolttffi LrlrGtr Eouipment Reouired MAX 10DB/ 2ODB Preliminarypreparation O o o o o o o o o o o o PerformanceCheck procedure 4g4Ll4g4ApServiceVol TrME/DrV PerformancecheckprocedureO o a o o a o o o o o o o o o o o o o o o o o o o o a TIME/DIVAUTO O o o o a o o a o a o o oSPAN/DIV TME/DV Auto Vertcaldtsplay A a o o o O a o o o o oA a o o o o o o o a o o o o o a o o o o o Center Freouencyaccuracycheckpoints CheckCenterFrequencyStabilitv O o a o a A a o o o o a o o o O o a o o o o o o a oAutoresoln on Verticaldtsplay O a o a o a o a a ResolutionbandwidthautoO o a o o o o o o a o o o o o a o o TME/DVAUTO TlmeMarkGenerator SPAN/DrVMarkerOutput 50 Hz 20 ms O a o a o O o a a o o o a o a o a a o o a o a o o o oAutoresoln Reflevel 10dB/Dtv A o a o o o a A o o o a o oA a TimeAccuracy C.**qyegp WithinS%oftherateserecitJi O a a o a o a CheckResolutionBandwidth and shape FactorO a o O o a o A o Minnose Qlglptv to 50Hz, andVERlCnl.drdpr-ry A o o O o a o a A o o o o o o o o o o O o o o oSPAN/DV MIN RFATTENdB LowLosscoAxcABLEwrrx sul courEEroid Nro sMAooaeten0 GHz 7.4 GHz 9,4 c A o o o o o a O o a o o A oO o a a a Narrow Videofilter PEAK/AVERAGE A o a a a o a o o a O o o o Tmeidivauto O o a o o o A oPart Narrowvideofilter TME/DV Auto PEAK/AVERAGE O o a PerformanceCheckprocedure- 4g4Al4g4ApServlceVol.1 TrME/DtV TestsettingsO a a Display 21BIDIV VerticalNarrowvtdeofilter TIME/DIV Auto O o O o a 15.RF attenuato. test equipment setup for 50-60 dB step Centebfreouency A a a o a oDisplay Widevideofilter DB/Dtv O a a o o o o a o A o o o o oA o a O a a O o a12s 103 Trr Freorange PerformanceCheck procedure- 4g4A/4g4ApServiceVolResolutionbandwidth 100 kHz CheckLO Emission -70 dBmor tess O aAutoresoln Otsplay 18.Test equipmentsetuplor checklngharmonicdistortion PerformanceCheckprocedure- 4g4Al4g4ApServiceVol.1 EXT @o@o@g@@ Resolutton PerformanceCheckprocedure- 4g4A/4g4ApServiceVol. lBandwtdth 1 MHz Verticaldisplay LIN Triggering INT TIME/OIV TME/DV EXT VertcalDtsplay 2 dB/DtV Optioninstruments RrttlI3fil l t r l CheckHORIZOUTPUTSignatLevel MAX Hold SpanidivDtsplay Tmeidiv Auto PEAK/AVERAGE Verttcal Comb Generator Mooule Ull Q15oit rilineTR5O2 OutputLevel -dBm Var dB Dot Intensity Off Gpibverificationprogram A o o o c Return O o o o o o o a oReturn 5OOOREM49XPGPIBVERIFICATION Program 5O9OINPUTT$ O a o a o r 8100PRINT 8070INPUT9040PRTNT10OMSGEOS 1OO1OPRINTSELECTEDDEVICE-CLEAR...SDC A o o 16000REM Talkonlymode 16010PAGE O c16050PRTNTTALK Jtestng only 16060INPUT Onlymode Fail JGPIBvERlFlcArtoH Cotapr-erEo ANDRENREMorEJJLrsrEN!TALKTLF OCrnoiness Message 19300cosuB19390 O o o o o o o O o o o o o o oGenerator 19530REMFAILUREDECISION Handler 19540PRINT!SELECT a UDK Can Damage StancdischargeSemiconductor Many Componentsused Thisinstrument A a o Adluctment Procedure- 4g4A/4g4ApServtceVotPreparation 7lu Selectorswttch O o o o o o o o o o o o o o o o o o o Adjustment Procedure- 494A/494ApServiceVol O o o o o o o o o o o o o o o O o o o o o o o o o o o o o o o o o o o o o o o oRrqm TIME/DIV MNL TIME/DIVAUTO Triggeringfreerun AdJustmantProcedure- 494A/4g4ApServiceVot. .l Test equlpment setup for adiusting the D€flection Amplifier Adiustment Procedure- 4g4Al4g4Ap ServiceVol Triggering EXT Adfustment Procedure- 4g4Ll4g4ApServtceVotO o o o o o o o o o o o o o o o O o o o o o o o o o o o o AdJustmentProcedure- 494A1494ApService VotO o o o o o o o o o o o o o o o o o o o o o o o o o OuFur GarnR1033 nrors O o o o o o o o o o o o o o o o o o o o o o Adjustnent Procedure- 4g4A/4g4ApServtceVotO a o O o o o o o o o o =?l Adjust Log AmptitierRPlo3s-.8 R1012 R102S,R1030 @o.@@GPt AdrustmentProcedure 4g4Ll4g4ApServtce Vot O o a o o o o o o o a o o o a o Filrcsotocr Adjustment Procedure- 494l4g4Ap ServiceVotA o o o a o o a o o o o o o o o o o o o O o o o O a o o o AdJustmentProcedure- 4g4l4g4Ap Service VotA a o A o O o o LNorE-l O o o o o o o o a O o a o o a o o a a o o o o o o o o o o o o o o Rcsct SETTTNGS2Tion Bandwidth Tionbandwtdth O o o o a a $o o3 $oO o a o a o a O o o o o a o o o a o a o o o OotHi O o o o O o o o oAi kHr O a o a o a o o o O a a a a o o o o a o o o o o o o o o o oMIN RF Atten Triggering Auto O a o o O o o a o Adjustment procedure 4g4Al4g4ApseMce vot Frequencyrange OTi#iO o a Rplo?2/h AdrustmentProcedure- 4g4A/494ApR1OS4 Frequency To 3.0-7.1 GHz, set Ot o AdfustrnentProcedure- 4g4A/4g4ApServtceVol A o o o A o o o o o a AdJustnentProcedure- 494A/4g4ApServtceVot @@r Lt. a o o a o O a oSnrnasrzen @ Rpzoro O o o o o A o o o o Optioninstruments Only AdjustOption0Z VR BandLevetino RFouT OUr AdrustmentProcedure- 4g4A/4g4ApServlceVot,IO a o a o o o o o Relativesusceptibilityto Staticdischargedamage IntroductionSectfon6 494A/494ApServicc Vot.1 Maintenance- 4g4Al4g4ApServlce Vot 367-028s,00 TroubleshootingAidsMaintenance- 494A1494ApServiceVol Page Troubleshooting Using Theerrormessagedisplay Diagnostics TUNINGFAILURE- 2NDLO Powersupplyoutof Regulation O a o a o TUNINGFAILURE- 1STLOMalntenance- 494A/494ApServlceVol TPl034 GroundRefer€nce Mixerfreo Desired1STLO Setnngaccuracy Auxiliary Synthesizer O o o o o o O o o o o o a Offset SET.540.672KHZ Ting Accu Racy 2NDLO Controldiagnosttca Lockdisabled Press Help Enable Pressshifttoexit PHASELOCKFAILURE- 1STLOEnabledpresshelpto Disable Strobefreq Shift Pulsestretcher O o a o e Malntenance- 4S4Al4g4ApServtceVol O o a o aTracemodes Maintenance- 494Al4g4fupService Vof Corrective Maintenance Selectedcomponents 1R1020A46A1Rl015 446A1Rl010 SERvIcING TooLs FoRBoARDTffi3.i*,o= MouNTEDcoMPoNENTs O o o o o a o o o o o o A aMafntenance- 494l4g4Ap ServtceVot.1 HorAlr HepairTerminal O o o O a a Maintenance- 494A/494ApServtceVot.1 Diode Color CodeO o c a o o Replacingassembliesand Subassemblies O o E a o o o c o o A o o a o a o o A30A57-GPIB Interface O o O o o o O o c o o o o a LlrxER Maintenance- 494Al4g4ApServiceVot.1Sr3- ltI O o o o o o o o o o o o o o o a o o o o o Page EAUloNl Main PowerSupplyModule Removal UpJ @o @@tr\ O o a o o o o o o o o o o O o o o o o o o o o o o o o o o Maintenanceadjustments O o o o o o o o o o o o o O a o o Malntenance- 494A/494ApServiceVolEouipmentrequiredforreturnlossadjustment Mafntenance- 494A1494ApServtceVot.1 A o o o o o o o o a o O o o o o o a o o o O o a a o o o o O o o o o o o o o o o o a o o O a a o a o o a a a o a o a o o o 829lr/lHzCoaxial Band-passFitterAdjustmentO o o o o o o o o o o O o o o o o o o Maintenance- 494l4g4Ap ServlceVot O a o o O o o o o a o o o o o o o o o o Malntenance- 494A/4g4ApServiceVolO o o o a o o 17.Corect re3ponsetor g29 MHr tlrlrd and fourth resonators O o o o a o o O o o o o o o o a o o O a o oO o o o o o o o o o o Calibrated100 MHz.with +20 kHz accu Lr.fry- gllpin . DoNorposinouexy op O o a o oA o o O o o Ffiffi Maintenance- 494A/4g4ApServtce Vot O a o a o a o o Maintenance- 4g4Al494ApService Vot.1 Mafnfenance- 4g4Ll494ApServtceVot.1 A a o a o o o O a a o o a o o A a o a o o o o o R404OFine TuneRanee Maintenanco- 4g4A/4g4Ap ServlceVol O a o a O a a o o o a o a o o A o o FREOSPAN/DV MAX Malntenance- 494A1494ApServtceVol O o o a a o oStart Spur Amplttude Capableof measuring0 Ogmit 2 t\,tt-tz FREQSPAN/DIV MAX Autoresoln on O o o o a a oFREQSPAN/DV MAX FREQSPAN/DIV MAX Autoresoln Reflevel RangeMinrf Atten Timeidv F t HhFr $ fMalntenance- 494A/494ApServlce Vol A o O o o o a o o a a o Malntenance- 494A/4g4ApServiceVotLl,l Jdl tt Settings Maintenance- 494A/4g4ApServtceVot.1A a O o o o a O a AddressBusTest C o o o O o o o oO o o o o a o SwtTcH Maintenance- 494A1494ApServiceVot..t0xxx U302s Maintenance- 494A/494ApServtceVol Instrument Bus Test Troubleshootingon InstrumentbusO o o o o a o o Yr iffiI Responseto ADDRquery DATAinstrumentbus data command ADDRinstrumentbusaddresscommand Malntenance- 494Alttg4ApService Vol CombinedADDRcommandand DATAcommandDATAinstrumentbus dataquery InstrumentBusRegisters Instrumentbusregisters X x x 0 0 X x x 0 1 X x x 1 0DB7-DBO DB3-DBO O a o A e Rfinput DBO DB5-DBOExtmixer DB7-O DB3-DBO O o o a aDB2 LSB VcoDB6 DB2 DBO DB2-DBO Front-PanelRegisters OFF Maintenance 4g4ful4g4ApService VolTapedatatransferprogram E o O o o aA o o o A o o o a o o Finished O o o o a o O t a O o o O o o o a O o t O o o a a o O o a a o o o a o a o o o o a o o O o o o O o o a o o o o a o o o o o o o o A o o Rollow Secton 494A1494Ap Service,VotPr signals. Blockdiagrams Showingmore O o o o O a o o a o o o o o o o o o a o o O o o o o o Page Lst ConverterDiagram12 RF InterfaceCircuits Diagram28RF Input TheRFINPUT50 connectoracceptstheinputsig O o o o o o o o o o Andpassesdtttreiueniy oro O o o o o o o o o o o o o O o o o o a o o o o o o a oPage Theoryof Operafon 4g4A/494ApServlce,Vot O o o o o o O o o o o o oTabte7-1 2NDCONVERTERIF Selection O o o O o o a o o o o o o o o 2472MHz2ND CONVERTERDiagram12O o o a o o o o o o o o o o o CAvrrYPosr+l+ Ou-Too---l Theory of Operaton 4g4A/4g4ApService, Vol. .lPrecision ExternalCabtes O o o o O o a o o o o O a o O a o o 2182MHz PHASELOCKED2nd LO Diagrams13 O a o O o O o o o Vco O a o a o o o o o o o o a o o a o o O a O o a o MHz 2nd Converter Diagrams15 O o o o o o o a o o o a o o o A o a oO o a a o o o A o a o o o o o o SwitchandamplifierOtr 829MHz2nd Conv O o a a a o o o O o o a Page O o a a o o o o o O o a a o o a o o o A o o a 110MHztF AMpLtFtERDiagram17Theory of Operation 4g4Al4g4ApService,Vol 3rd CONVERTERDiagram17 110MHzFTLTERS Diagram17A o o o O o o o O a o A o o o o o o O o o O o a o O a o REFERENCELOCKDiagramS0 O o A o o o o o o a Bandwidthselection VariabfeResolution Diagrams19, 19,104Id,and A o o o o o O o o A a o o o o O o O o o GalnRequired BandLevetingCircuitDiagram20 A o o O o Fn9 input signat.at a nominal14 dBm, is applied LOc AMp and Detector Diagram22 316 O a o o a0316 316 684 O o o Theory of Operation- 4gA/494Ap Servtce,Vol A a o o Theoryof Operation- 4g4ful4g4ApServtce,Vot VIDEOAMpLtFtERDiagram23Functionaldescrtption 12. Selecdon ol display positlon on lhe log scale Theory of Operaton 494l4g4Ap Servlce,Vol VtDEo PROCESSORDAGRAM24 Ffi rffi Theory of Operaton 4g4Al4g4ApService,Vol O o C2016 C3026Filtercomponentcombinations DB2 DB3 Sytemis desisncto opn IT,r-.,.P.,9? DlclTAL STORAGEDiagrams25 O o Theory of Operadon- 4g4N4g4Ap Servtce,Vot.l LI lPage O o O a o o O o o o o Theoryof Operafon 494A/4g4ApServlce,Vol O o o o o o a o o o O o a a A o a a o o O o e Clisplayappearsas a bright dot sweepingacross DEFLECTIONAMpLtFtERSDiagram27500 digitalstoragesweep positions. The resulting Axisand RF Interface DTAGRAM28 O a o o O o o Transferswitchdriver Enables CurrentdriversO o O o o a o o A o O o o o o o o o O a a MHztF high Stateor F829 MHzlF towstate HTGH,VOLTAGESUPPLYDAGRAM29 O o A o O o o o O o a o CRT READOUTDAGRAM30 O o o o o O o o o o o oLf BLANKMSBof the characterdatais not set,the GEN RUNNTNGflip-flopunassertsR/o oFF throughoR Theory of Operatlon 4g4A/4g4Ap Service, Vol O o o o o o o o o o o o o o o o o o o o o o o o o o o o Theory of Operation- 4g4Ll4g4ApService,Vot. lZo-cou I lF-€ OFFTME u1055-d X x o o o o o X x x x x xX o o o o o X . o o o o o Theory of Operation- 4g4l4g4Ap Servlce,Vol O o o o o o o o o o o o o o o o o o o o o o o o o o o o o \i o Oe o Address of Ascii code Skip bit Blank character 58O Theory of Opera$on- 494l4g4Ap Servtce,Vol O o o a o o o o a O o o o o o o o O o a A o o o a o o o o o O a o o o o o a o o SWEEPDiagram31Theory of Operaton 494A/494ApService,Vol D4 D3 D2 D1 do A o o O a O a o o o o o o o o20ssldiv 100 O a o o a o o o a o o o o o Theory of Operation- 494A/494ApService,Vol Tabte7-12Triggerselectionmodes TriggerMode Freerun Internal Ext€rnal Line TableZ-13 O a a o a o A o a o o o o A o a o A a o o o o a o o o o o O o o o o O a A o o o o o o A o A o o A o o o o a o o SPANATTENUATORDiagram32 Calibrationcontrolselectioncodes Theory ol Operaton 4g4A/494ApService,Vot20k O o o o a a a o o A o o a a a 1st LO DRTVERDiagram33Xl K3065 x0.1 K3075 x0.01 K4072 X0.01 DB7 O o a o o o o o O a a o a O o o o o o o o o o aDB4 O o a a o o o A o Preselectordriver Diagram34A o O o a o o o o o O o a o a o a oU5031OUTPUTLINES Span Volts Span Volts Preselector Freouencybands Theory of Opera0on- 4g4\l4g4Ap Servlce,VotTabteT-18 A o a o o o o Centerfreouencycontrol DIAGRAM35O o A a a a o O o o Figure Z-2S. DAC Varlance graph O o a O o o Theory of Operaton 494l4g4Ap Servlce,Vot O o O a o o A oRuooeour ADDRESS70 Formats O o o a o C o a o O o o o o o o o O o a o o o a o Functionaldescription Theory of Operation- 4g4ful4g4ApService,VotO o o O a a HARMONICMIXERDiagram36 Theory of OperaUon- 494Al4g4ApServtce,Vot.1 AUXILIARYSYNTHESZERDiagram37O a a A o o O o o o o O a o o o o o a A o Theoryof Operation- 4g4A/494ApService,VolPage COUNTERBOARDDiagram38 Phaselocksynthesizer Diagrams39 O o o o o e O e o o o o o o o o o o oO o o a U2025OUTPUTLINES O e o o a o o o o o o o o o Page Theory of Operation- 494l4g4Ap Service,Vot DIGITALCONTROLDiagram9 30. System memory map Theory of Operation- 4g4Ll4g4ApServlce,Vol 31. UOaddr€ssspace Theoryof Operation- 494A/494ApServlce,Vol O o c o Theory of Operation- 4g4hl4g4ApService,VolPage Bit A a O o O o o o o o o a oPollbits O o a o o o o o A o A a o Lunr A a O o o o oFf nsrrrcrr qrs crccr O a o O a o o o o o o A a O a o o O o o o O o o a o A o o O a o O o o o o o o o a o o o o o o o o 100 O o o o o o o o o a o o 101 102 CoL O o o o a o O o o o o o o Main power Supplyfurnishes all the regulated103 Theory of Operation- 4g4A/494ApServlce,Vol Theory of Operaton 494A/494ApServtce,Vot O a o o o o o o o a o o o o oO o o o A o o o o o Oenanon*l 105Theory of Operation- 494l4g4Ap Servlce,Vot 106 +5 V Voltage ReferenceSupply Theory of Operation 4g4Ll4g4ApService, Vot Determiningcomponents 107 O o o o o O a a o a o o a a a o o o a oPage Swtss Opl ONsRcV/134 CalibratorOutput cALOUT O a o o o o o o o o o O o o O o o o A o o o o o o o Freouency O a o o a o o o o o o o a o o o o o o oO a o O o o o o o o o o o o o Goesanoffi O o o o a o o o A o A aSymmetry OoultnGffi A o o a o o Vtdeoimarker A o o o o a a o o o a o o o oGeneralterms O o o o o o Gfoesary- 494l4g4Ap Service,VolFrequencyterms Amplitudeterms Digitalstorageterms A o a o o O a a o o a O o o o o O o a o o o Manual Part No G556O-00 Flrst prtnilng JAN1987 Revleed Revisioninformation O o a a o a o o o o o o a o o 12s O o o o a oSENSmVTY Instrument O o Efr/sN O o a o o A o a o O o o A o a o o O o o o o o o O o O o o o Chg. Ref M63911 Product see llst Dale2-22-88 Productsee llst DeflectionAmplifiertestpointsandadjustments Page5 ol O a o o o o o o o o Instrument Manual Performance CheckprocedureO o o o o O o a A o o o O o O a a ADD Instbument Partno O o o o o O o o o a Date 5/u9o Perfrmanceheck pRocEDURE change stepr r as foltowsProduct494N4g4Ap ServiceVol O a o o o O a o o o o ServiceVot.1Date 6/1190 Product494N494Ap LO0 RHIVehticaldisplay Peaiaverage + \ +i\ MHz DB Bandwidth Resolution Verncal Freouency Bandwidth Display SpaivdivMHz 10dB 100kHz DB Bandwidth Limits 60dB Measured Parti ResolutionbandwdithMinnoise Verticaldisplay Narrow Videofilter TIME/DIV Auto Peaivaverage Peavaverage A a a Tercfgnix CHANcE INFoRMAnoN SpecificationPerformanceVerification Check1 dB Compressionpoint Product SeeLlst Date11 FREQUENCYSPAN/DIV 1 MHz RESOLUTIONBANDWTDTH1 MHzSpectrumAnalyzerUnder Test Ref. C1-991 A o a o o O c