Fluke 6080A User manual

6080A/AN
SYNTHESIZED SIGNAL GENERATOR
ServiceManual
P/N868906
October1989
©1989,JohnFlukeMfg.Co.Inc.AllrightsreservedPOBoxC9090EverettWA98206
Advanced Test Equipment Rentals
www.atecorp.com 800-404-ATEC (2832)
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WARRANTY
TheJOHNFLUKEMFG.CO.,INCwarrantseachinstrumentitmanufacturestobefreefromdefectsin
materialandworkmanshipundernormalusefor2 yearsfromthedateofpurchase.Thiswarrantyextends
onlytotheoriginalpurchaser.Thiswarrantyshallnotapplytofuses,disposablebatteries,oranyproductor
partsthathavebeensubjecttomisuse,neglect,accident,orabnormalconditionsofoperation.
Intheeventoffailureofa productcoveredbythiswarranty,JOHNFLUKEMFG.CO.,INCwillrepairand
calibrateaninstrumentreturnedtoanauthorizedServiceCenterwithin2 years oftheoriginalpurchase;
providedthewarrantor'sexaminationdisclosestoitssatisfactionthattheproductwasdefective.The
warrantormay,atitsoption,replacetheproductinlieuofrepair.Withregardtoanyinstrumentreturned
within2 yearsoftheoriginalpurchase,saidrepairsorreplacementwillbemadewithoutcharge.Ifthefailure
hasbeencausedbymisuse,neglect,accident,orabnormalconditionsofoperation,repairswillbebilledata
nominalcost.Insuchcase,anestimatewillbesubmittedbeforeworkisstatedifrequested.
Ifanyfailureoccurs,thefollowingstepsshouldbetaken:
1.NotifytheJOHNFLUKEMFG.CO.,INCornearestServiceCenter,givingfulldetailsofthe
difficulty.Includethemodelnumber,typenumber,andserialnumber.
Onreceiptofthisinformation,servicedataorshippinginstructionswillbeforwardedtoyou.
2.Onreceiptoftheshippinginstructions,forwardtheinstrument,transportationprepaid.
RepairswillbemadeattheServiceCenterandtheinstrumentwillbereturnedprepaid.
SHIPPINGTOMANUFACTURERFORREPAIRORADJUSTMENT
AllshipmentofJOHNFLUKEMFG.CO.,INCinstrumentsshouldbeshippedintheoriginalpackingcarton(if
available).Iftheoriginalcartonisnotavailable,useanysuitablecontainerthatisrigidandofadequatesize.If
asubstitutecontainerisused,theinstrumentshouldbewrappedinpaperandsurroundedwithatleastfour
inchesofshock-absorbingmaterial.

TableofContents
SECTIONTITLEPAGE
1INTRODUCTIONANDSPECIFICATIONS1-1
1-1.INTRODUCTION1-1
1-2.UNPACKINGTHESIGNALGENERATOR1-1
1-3.SAFETY1-2
1-4.ACCESSORIES1-3
1-5.SIGNALGENERATORSPECIFICATIONS1-3
2THEORYOFOPERATION2-1
2-1.INTRODUCTION2-1
2-2.GENERALDESCRIPTION2-1
2-3.FrontPanelSection2-2
2-4.Upper/LowerModuleSections2-2
2-5.RearPanelSection2-2
2-6.FUNCTIONALDESCRIPTION2-2
2-7.Frequency2-2
2-8.FrequencyModulation2-4
2-9.PhaseModulation2-4
2-10.Output/LevelControl2-5
2-11.AmplitudeModulation2-5
2-12.PulseModulation2-5
2-13.InternalModulationOscillator2-6
2-14.PowerSupplyDescription2-6
2-15.DIGITALCONTROLLERSOFTWAREDESCRIPTION2-6
2-16.UserInterface2-6
2-17.Calibration/CompensationMemory2-7
2-18.Self-Test2-7
2-19.StatusSignals2-7
3CLOSED-CASECALIBRATION3-1
3-1.INTRODUCTION3-1
3-2.FrontPanelCalibration3-2
3-3.RemoteCalibration3-2
3-4.CalibrationData3-3
3-5.AMCALIBRATION3-4
3-6.FrontPanelAM CalibrationProcedure3-4
3-7.RemoteAMCalibrationProcedure3-6
i
(continued on page ii)

TABLEOFCONTENTS,continued
SECTIONTITLEPAGE
3-8.FMCALIBRATION3-7
3-9.FrontPanelFMCalibrationProcedure3-8
3-10.RemoteFMCalibration3-9
3-11.RFLEVELCALIBRATION3-10
3-12.FrontPanelLevelCalibrationProcedure3-11
3-13.RemoteLevelCalibrationProcedure3-13
3-14.REFERENCEOSCILLATORCALIBRATION3-14
3-15.FrontPanelReferenceOscillatorCalibrationProcedure3-15
3-16.RemoteReferenceOscillatorCalibrationProcedure3-16
4PERFORMANCETESTS4-1
4-1.INTRODUCTION4-1
4-2.TESTEQUIPMENT4-1
4-3.POWER-ONTEST4-4
4-4.FREQUENCYACCURACYTEST4-5
4-5.SYNTHESISTEST4-5
4-6.HIGH-LEVELACCURACYTEST4-6
4-7.MID-LEVELACCURACYTEST4-8
4-8.LOW-LEVELACCURACYTEST4-9
4-9.ALTERNATE-LEVELACCURACYTEST4-10
4-10.FLATNESSTEST4-13
4-11.OUTPUTLEAKAGETEST4-14
4-12.HARMONICANDLINE-RELATEDSPURIOUSTEST4-15
4-13.PHASENOISEANDNON-HARMONICSPURIOUSTESTS4-16
4-14.MODULATIONTESTS4-17
4-15.VOLTAGESTANDING-WAVERATIO(VSWR)TESTS4-23
4-16.PULSETESTS4-24
5ACCESSPROCEDURES5-1
5-1.INTRODUCTIONANDSAFETY5-1
5-2.LOCATIONOFMAJORASSEMBLIES5-3
5-3.ACCESSINSTRUCTIONS5-3
5-4.RemovingtheFrontPanelSection5-3
5-5.RemovingtheRearPanelSection5-3
5-6.RemovingtheA2CoarseLoopPCA5-4
5-7.RemovingtheA3 Sub-SynthesizerVCOPCA5-4
5-8.RemovingtheA4Sub-SynthesizerPCA5-5
5-9.RemovingtheA5 CoarseLoopVCOPCA5-5
5-10.RemovingtheA6ModOscillator PCA5-5
5-11.RemovingtheA8OutputPCA5-5
5-12.RemovingtheA9SumLoopVCOPCA5-6
5-13.RemovingtheA10PremodulatorPCA5-6
5-14.RemovingtheA11ModulationControlPCA5-6
5-15.RemovingtheA12SumLoopPCA5-7
5-16.RemovingtheA13ControllerPCA5-7
5-17.RemovingtheA14FMPCA5-8
5-18.RemovingtheA20Attenuator/RPPAssembly5-8
5-19.RemovingtheA22DelayCableAssembly5-8
ii
(continued on page iii)

TABLEOFCONTENTS,continued
SECTIONTITLEPAGE
6CIRCUITDESCRIPTIONS,TROUBLESHOOTING,ANDALIGNMENT6-1
6-1.INTRODUCTION6-1
6-2.MODULEREPLACEMENT6-4
6-3.A1DisplayPCA6-5
6-4.A2CoarseLoopPCA6-5
6-5.A3Sub-SynthesizerPCA6-5
6-6.A4Sub-SynthesizerPCA6-5
6-7.A5CoarseLoopVCOPCA6-5
6-8.A6ModOscillatorPCA6-5
6-9.A7RelayDriverPCA6-5
6-10.A8OutputPCA6-5
6-11.A9SumLoopVCOPCA6-5
6-12.A10PremodulatorPCA6-6
6-13.A11ModulationControlPCA6-6
6-14.A12SumLoopPCA6-6
6-15.A13ControllerPCA6-6
6-16.A14FMBoardPCA6-6
6-17.A15PowerSupplyPCA6-6
6-18.A19SwitchPCA6-6
6-19.A20Attenuator/RPPAssembly(A7,A21,A30)6-6
6-20.A22DelayLineAssembly(A25+A26+DelayCable+TrimCable).......6-6
6-21.UPDATINGCOMPENSATIONMEMORYWITH
MODULEEXCHANGEDATA6-7
6-22.PARTSREPLACEMENT6-8
6-23.SELF-TESTDESCRIPTION6-8
6-24.DigitalTests6-8
6-25.AMTests6-9
6-26.FMTests6-9
6-27.øMTests6-9
6-28.DCFMTest6-10
6-29.CoarseLoopTests6-11
6-30.Sub-SynthesizerTests6-11
6-31.SumLoopTests6-11
6-32.RFOutputTests6-12
6-33.PulseModulatorTests6-12
6-34.FilterTests6-12
6-35.STATUSSIGNALSANDSTATUSCODES6-13
6-36.SOFTWAREDIAGNOSTICFUNCTIONS6-14
6-37.DigitalControlLatchTest6-14
6-38.InstrumentDiagnosticState6-14
6-39.SetInternalDACs6-14
6-40.DisplaySynthesizerLoopFrequencies6-15
6APOWERSUPPLY6A-1
6A-1.POWERSUPPLYBLOCKDIAGRAM6A-1
6A-2.POWERSUPPLYCIRCUITDESCRIPTION6A-1
6A-3.POWERSUPPLYTROUBLESHOOTING6A-4
6A-4.TroubleshootingProcedure6A-4
6A-5.POWERSUPPLYADJUSTMENTPROCEDURE6A-5
iii
(continued on page iv)

TABLEOFCONTENTS,continued
SECTIONTITLEPAGE
6BDIGITALCONTROLLER6B-1
6B-1.DIGITALCONTROLLERBLOCKDIAGRAM6B-1
6B-2.DIGITALCONTROLLERCIRCUITDESCRIPTION(A13)6B-1
6B-3.Microprocessor6B-1
6B-4.Memory6B-1
6B-5.MemoryControl6B-3
6B-6.FrontPanelInterface6B-3
6B-7.IEEE-488Interface6B-3
6B-8.AttenuatorControlInterface6B-3
6B-9.ModuleI/O6B-3
6B-10.StatusandControl6B-4
6B-11.DIGITALCONTROLLERTROUBLESHOOTING6B-4
6B-12.RFControl6B-4
6B-13.MicroprocessorKernel6B-5
6B-14.Clock6B-5
6B-15.Power-OnReset6B-5
6B-16.UnusedMicroprocessorInputs6B-5
6B-17.BusError6B-5
6B-18.Interrupts6B-5
6B-19.MicroprocessorBus6B-6
6B-20.AddressDecoder6B-6
6B-21.I/ODiagnosticTests6B-7
6B-22.CALIBRATION/COMPENSATIONMEMORY6B-8
6B-23.Calibration/CompensationMemoryStatus6B-8
6B-24.RepairingCalibration/CompensationMemoryChecksumErrors..6B-9
6B-25.Calibration/CompensationMemoryOriginStatus6B-9
6B-26.FRONTPANELCIRCUITDESCRIPTION6B-9
6B-27.DisplayPCA6B-10
6B-28.DataCommunications6B-10
6B-29.DisplayFilamentVoltage6B-10
6B-30.Bright-DigitEffect6B-10
6B-31.SwitchboardInterface6B-10
6B-32.RemoteFootswitch6B-10
6B-33.Edit KnobInterface6B-11
6B-34.DisplayBlanking6B-11
6B-35.Operate/StandbySelection6B-11
6B-36.FRONTPANELTROUBLESHOOTING6B-11
6B-37.DisplayandControls6B-11
6CFREQUENCYSYNTHESIS6C-1
6C-1.FREQUENCYFAULTTREE6C-1
6C-2.SUB-SYNTHESIZERBLOCKDIAGRAM6C-1
6C-3.SUB-SYNTHESIZERCIRCUITDESCRIPTION(A4)6C-1
6C-4.SUB-SYNTHESIZERTROUBLESHOOTING6C-9
6C-5.SUB-SYNTHESIZERADJUSTMENTS6C-13
6C-6.SteeringDACFullScaleAdjustment6C-13
6C-7.LowerClampAdjustment,R996C-13
6C-8.UpperClampAdjustment,R986C-14
6C-9.SSBMixerLODriveAdjustment,R1066C-14
6C-10.10-kHzNotchAdjustment,L566C-15
IV
(continued on page v)

TABLEOFCONTENTS,continued
SECTIONTITLEPAGE
6C-11.SUB-SYNTHESIZERVCO(A3)CIRCUITDESCRIPTION6C-16
6C-12.SUB-SYNTHESIZERVCOTROUBLESHOOTING6C-16
6C-13.COARSELOOPCIRCUITDESCRIPTION(A2)6C-17
6C-14.REFERENCESECTIONBLOCKDIAGRAM6C-17
6C-15.COARSELOOPBLOCKDIAGRAM6C-20
6C-16.COARSELOOPTROUBLESHOOTING6C-22
6C-17.COARSELOOPPCAADJUSTMENTS6C-26
6C-18.DiscriminatorVideoAmplifierOffsetAdjustment,R1026C-26
6C-19.SteeringGainAdjustment,R2216C-28
6C-20.AcquisitionOscillatorLevelAdjustment,R2276C-28
6C-21.40-MHzOscillatorAdjustment,L6016C-28
6C-22.80-MHzFilterTuning,L612andL6136C-29
6C-23.80-MHzLevelAdjustment,R6176C-30
6C-24.2-MHzNotchAdjustment,L2056C-30
6C-25.AlternateReferenceFrequencySelection6C-31
6C-26.COARSELOOPVCO(A5)CIRCUITDESCRIPTION6C-31
6C-27.COARSELOOPVCOTROUBLESHOOTING6C-32
6C-28.SUMLOOPBLOCKDIAGRAM6C-32
6C-29.SUMLOOP(A12)CIRCUITDESCRIPTION6C-34
6C-30.RFSection6C-34
6C-31.AudioSection6C-35
6C-32.SUMLOOPTROUBLESHOOTING6C-38
6C-33.SUMLOOPASSEMBLYADJUSTMENTS6C-41
6C-34.SteeringLevelAdjustment,R1126C-41
6C-35.BufferGainMatchAdjustment,R1216C-42
6C-36.FMNullAdjustment,R1166C-42
6C-37.LoopGainAdjustment,R1676C-43
6C-38.AcquisitionOscillatorLevelAdjustment,R1326C-44
6C-39.SUMLOOPVCO(A9)CIRCUITDESCRIPTION6C-44
6C-40.SUMLOOPVCO TROUBLESHOOTING6C-45
6DRFLEVEL/AM6D-1
6D-1.RFLEVELFAULTTREE6D-1
6D-2.RFLEVELBLOCKDIAGRAM6D-1
6D-3.RFLEVELCIRCUITDESCRIPTION6D-3
6D-4.RFPath6D-3
6D-5.LevelingLoop6D-5
6D-6.LevelControl6D-6
6D-7.RFLEVELTROUBLESHOOTING6D-6
6D-8.UnleveledCondition6D-8
6D-9.OutputAssemblyTestPointSignalInformation6D-9
6D-10.RF LEVELADJUSTMENTS6D-10
6D-11.ModControlPCALevelDACOffsetAdjustment,R236D-10
6D-12.ModControlPCAAMDACOffsetAdjustment,R86D-11
6D-13.ModControlPCADetectorOffsetAdjustment,R286D-12
6D-14.ModControlPCAAMDepthAdjustment,R106D-13
6D-15.ModControlPCARFLevelAdjustment,R206D-14
6D-16.ModControlPCAExternalModulationLevel
IndicatorAdjustment,R716D-15
6D-17.ModControlPCASumSteerGainAdjustment6D-15
v
(continued on page vi)

TABLEOFCONTENTS,continued
SECTIONTITLEPAGE
6D-18.OutputPCAHetMixerLevelAdjustment,R726D-16
6D-19.OutputPCAHetLevelAdjustment,R106D-17
6D-20.PremodulatorPCABandwidthAdjustment,R51andC76D-17
6D-21.OutputPCAQ16BiasAdjustment,R966D-18
6D-22.OutputPCAQ9BiasAdjustment,R16D-19
6D-23.OutputPCA)GainFlatnessAdjustment,C2016D-19
6D-24.FMGainAdjustment,R82,onModControlPCA6D-20
6D-25.FMSteerGain,R101onModControlPCA6D-20
6D-26.FMINVBalance,R102onModControlPCA6D-20
6D-27.ATTENUATOR/REVERSEPOWERPROTECTION(RPP)6D-20
6D-28.ATTENUATORRPPTROUBLESHOOTING6D-21
6EFREQUENCYANDPHASEMODULATION6E-1
6E-1.FM/øMFAULTTREE6E-1
6E-2.FM/øMBLOCKDIAGRAM6E-2
6E-3.CIRCUITDESCRIPTION6E-2
6E-4.OscillatorSection6E-2
6E-5.DividerSection6E-4
6E-6.PhaseDetectors,LoopCircuits,and LogicSection6E-4
6E-7.ModulationSection6E-7
6E-8.MODULATIONCONTROLCIRCUITDESCRIPTION6E-10
6E-9.FMInputVoltageProcessing6E-10
6E-10.FMSteerVoltageGeneration6E-10
6E-11.FMControlSignalsGeneration6E-10
6E-12.FMTROUBLESHOOTING(A14)6E-11
6E-13.FrequencyCheck6E-11
6E-14.ModulationCheck6E-12
6E-15.InputSignalsandControlInputSignalsChecks6E-12
6E-16.FMADJUSTMENTS6E-13
6E-17.AdjustmentsontheModulationControlPCA(A11)6E-13
6E-18.AlignmentofFMPCA(A14)6E-14
6FINTERNALMODULATIONOSCILLATOR6F-1
6F-1.MODULATIONOSCILLATORBLOCKDIAGRAM6F-1
6F-2.INTERNALMODULATIONOSCILLATOR
CIRCUITDESCRIPTION6F-1
6F-3.DirectDigitalSynthesizedWaveGenerator6F-1
6F-4.PulseGenerator6F-3
6F-5.SignalRouting6F-3
6F-6.MODOSCILLATORTROUBLESHOOTINGAND
ADJUSTMENTS6F-4
6F-7.DirectDigitalSynthesizerTroubleshooting6F-4
6F-8.PulseGeneratorTroubleshooting6F-5
7LISTOFREPLACEABLEPARTS7-1
TABLEOFCONTENTS7-1
7-1.INTRODUCTION7-2
7-2.HOWTOOBTAINPARTS7-2
7-3.SERVICECENTERS7-3
vi
(continued on page vii)

TABLEOFCONTENTS,continued
SECTIONTITLEPAGE
8SCHEMATICDIAGRAMS8-1
TABLEOFCONTENTS8-1
APPENDICES
A.INSTRUMENTPRESETSTATEA-l
B.SPECIALFUNCTIONTABLEB-l
C.REJECTEDENTRYERRORCODESC-l
D.OVERRANGE/UNCALSTATUSCODESD-l
E.SELF-TESTSTATUSCODESE-l
F.COMPENSATIONMEMORYSTATUSCODESF-l
G.EXAMPLECALIBRATIONCONTROLLERPROGRAMSG-l
H.COMPENSATIONPROCEDURESH-l
I.REARPANELAUXCONNECTORPINOUT1-1
viilviii