HP 5065A Service manual

OPERATINGANDSERVICEMANUAL
5065A
RUBIDIUMVAPOR
FREQUENCYSTANDARD
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ReproducedwithPermission.courtesyofAgilentTechnologies,Inc.
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NOTFORRESALE aHEWLETT
PACKARD
5

SAFETY
This product has been designed and testedaccording to International Safety Requirements. To ensure
safeoperation and to keep the product safe,the information, cautions, and warnings in this manual
must be heeded. Refer to Section I for general safety considerations applicable to this product.
CERTIFICATION
Hewlett-Packard Company certifies that this product met its published specifications at the time of
shipment from the factory. Hewlett-Packard further certifies that its calibration measurements are
traceable to the United States National Bureau of Standards, to the extent allowed by the Bureau's
calibration facility, and to the calibration facilities of other International Standards Organization
members.
WARRANTY
ThisHewlett-Packardproduct is warrantedagainstdefectsinmaterialandworkmanshipfor a periodof
oneyearfromdateofshipment,exceptthatinthe case ofcertaincomponentslistedinTable1-3ofthis
manual, thewarrantyshallbeforthespecifiedperiod.Duringthewarrantyperiod,Hewlett-Packard
Company will, atitsoption,eitherrepairorreplaceproductswhichprovetobedefective.
Forwarrantyserviceorrepair,thisproductmustbereturnedtoa servicefacilitydesignatedbyHP.
However,warrantyserviceforproductsinstalledbyHPandcertainotherproductsdesignatedbyHP
willbeperformedatBuyer'sfacilityatnochargewithintheHPservicetravelarea.OutsideHPservice
travelareas,warrantyservicewillbeperformedatBuyer'sfacilityonlyuponHP'sprioragreementand
BuyershallpayHP'sroundtriptravelexpenses.
ForproductsreturnedtoHPforwarrantyservice,Buyershallprepay shippingchargestoHPandHP
shallpayshippingchargestoreturntheproducttoBuyer.However,Buyershallpayallshipping
charges,duties,andtaxesforproductsreturnedtoHPfromanothercountry.
LIMITATIONOFWARRANTY
Theforegoingwarrantyshallnotapplytodefectsresultingfromimproperorinadequatemaintenance
byBuyer,Buyer-suppliedsoftwareorinterfacing,unauthorizedmodificationormisuse,operation
outsideoftheenvironmentalspecificationsfortheproduct,orimpropersitepreparationor
maintenance.
NOOTHERWARRANTYISEXPRESSEDORIMPLIED.HPSPECIFICALLYDISCLAIMSTHEIMPLIED
WARRANTIESOFMERCHANTABILITYANDFITNESSFORA PARTICULARPURPOSE.
EXCLUSIVEREMEDIES
THEREMEDIESPROVIDEDHEREINAREBUYER'SSOLEANDEXCLUSIVEREMEDIES.HPSHALLNOT
BELIABLEFORANYDIRECT,INDIRECT,SPECIAL,INCIDENTAL,ORCONSEQUENTIALDAMAGES,
WHETHERBASEDONCONTRACT,TORT,ORANYOTHERLEGALTHEORY.
ASSISTANCE
Product maintenance agreements and other customer assistance agreements are available for
Hewlett-Packard products.
For any assistance, contact your nearest Hewlett-Packard Sales and Service Office. Addresses are
provided at the back of this manual.

RUBIDIUMVAPORFREQUENCYSTANDARD
5065A
SERIALPREFIX:1908A
ThismanualappliesdirectlytoHPModel5065ARubidium
VaporFrequencyStandardshavingserialprefix1908A.
OLDERINSTRUMENTS
Changesrequiredtobackdatethismanualforolderin-
strumentsareinSectionVII.
OPTIONS
ForinstrumentshavingOptions 001, 002,or003,referto
SectionsIIIthroughVII.
CopyrightHEWLETT-PACKARD1979
5301STEVENSCREEKBLVD.,SANTACLARA,CALIF.95050
ManualPartNo.05065-9041
MicrofichePartNo.05065-9042Printed:NOV1979
What
HEWLETT
mllHM PACKARD

Model5065A
ManualContents
MANUALCONTENTS
Thismanualissuppliedtohelpyoumakebestuseof
yourinstrument.Themanualcoverseightsectionsof
informationasfollows:
SectionI isanintroductiontotheInstrument.Elec-
tricalspecificationsandaccessoriesinformationis
given.
SectionIIcoversinspections,power,mounting,pack-
ing, shipping,andconnection.
SectionIIIoutlinesoperatingprocedures.
SectionIVdiscussestechnicaloperations.
SectionV contrainsdisassemblyandrepairprocedures
andanin-cabinetperformancecheck.
SectionVIlistsreplaceableparts.
SectionVIIgivesoptionsandmanualchanges
information.
SectionVIIIcontainscircuitdiagrams,component
locatorsandwaveforms.Includedareadjustment
proceduresandtroubleshootinginformation.
HOWTOORDER
Toorderanoperatingandservicemanual,contactthe
nearestHewlett-PackardSalesandServiceOffice.
Givecompletemodel,name,andnine-digitserial
number.Theserialnumberplateisontherearpanel.
CommentsonthismanualarewelcomeatanySales
andServiceOffice.

Model5065A
TableofContents
TABLEOFCONTENTS
SectionPage
IGENERALINFORMATION1-1
1 -1. Introduction1-1
1-2.Description1-1
1-5.Options1-1
1-6.CircuitChecksandOutputs1-1
1-8.Terminology1-1
1-10.Specifications1-1
1-13.InstrumentIdentification1-1
IIINSTALLATION2-1
2-1. UnpackingandInspection2-1
2-3. StorageandShipment2-1
2-4. Environment2-1
2-6. ExtendedStorage2-1
2-8.RVFRStorageProcedure2-1
2-10.Packaging2-1
2-14.ElectricalConnections2-2
2-15.PowerConnection2-2
2-18.MatingConnectors2-2
2-20.OperationasBenchorRackInstrument2-3
2-22. InstallationLocation2-3
IIIOPERATION3-1
3-1. Introduction3-1
3-3.Options001and002(Option003= 001and002)3-1
3-5.OperatingProcedure3-1
3-6.General3-1
3-8.Turn-OnProcedure(seeFigure3-2)3-1
3-9.Turn-OnAfterLongStorage3-1
3-10.FrequencyOffsetandCalibration3-2
3-18.FrequencyComparisonUsingK34-59991ALinearPhaseDetector3-5
3-19.OperationwithTimeStandardOption001(or003)3-9
3-22.SettingtheClockPhasetoanExternalClock3-9
3-24.AutomaticSynchronization3-9
3-26.ManualSynchronization3-9
3-28.SettingtheClock3-9
3-29.OperationwithStandbyPowerSupplyOption0023-11
IVTHEORYOFOPERATION4-1
4-1. Theory4-1
4-2. General4-1
4-15. Option001,TimeStandard4-2
4-20. Option002,StandbyPowerSupply4-3
VMAINTENANCE5-1
5-1. Introduction5-1
5-5.InstrumentAccess5-1
5-7.PeriodicMaintenance5-1
5-8.InstrumentTroubleshooting5-6
5-9.Introduction5-6
5-15.FaultFinding5-7
5-19.LoopAlignmentProcedure5-12
5-20.Introduction5-12
5-22.+20VoltAdjustment(A15PowerSupplyand
RegulatorAssembly)5-12
5-24.A10FrequencyAdjustment5-12
5-25.RFAlignment5-13
5-26.Signal-to-NoiseRatio5-14
5-27.ModulationFrequencyAdjustment5-14
5-28.PhaseAdjustmentRecheck5-14
IV

Model5065A
TableofContents,ListofFigures
TABLEOFCONTENTS(Continued)
SectionPage
5-29.PhaseDetectorandIntegratorZeroAdjustment5-15
5-30.LoopGainAdjustment5-15
5-31. LoopAssembly(A14)Alignment5-15
5-32.Option002,StandbyPowerSupplyMaintenance5-16
5-37. BatteryRemovalandReplacement5-16
5-38.ClockDisplayAssemblyA195-16
VIREPLACEABLEPARTS6-1
6-1. Introduction6-1
6-4.OrderingInformation6-1
VIIMANUALCHANGESANDOPTIONS7-1
7-1. ManualChanges7-1
7-3.NewerInstruments7-1
7-5.OlderInstruments7-1
7-7.Options7-1
7-9.Option001TimeStandard7-1
VIIICIRCUITDIAGRAMS8-1
8-1. General8-1
LISTOFFIGURES
FigurePage
1 -1. Model5065AandAccessories1-0
2-1. ElectricalHookupforRVFRStorage2-2
2-2. ConversionforRackMounting2-3
3-1. RVFRPumping3-2
3-2.Turn-OnProcedure3-3
3-3.MagneticFieldControl3-5
3-4.ErrorMeasurement3-5
3-5.EquipmentSetupforCalibratingPhaseMeasurementSystem3-7
3-6.EquipmentSetupforFrequencyDifferenceMeasurement3-8
3-7.InternalMeasurementwithAutomaticSynchronization3-12
3-8.InternalMeasurementwithManualSynchronization3-12
3-9.FrontPanelControls3-13
3-10.RearPanelOperatingControls3-14
3-11. TopOperatingControls3-15
4-1. RubidiumAbsorptionPlot4-1
4-2. Rb87AbsorptionCellOutput4-2
4-3. RVFRAssemblyBlockDiagram4-3
5-1. A8TP3Waveformat200x 10-10andPhaseMisadjusted5-2
5-2.A8TP3Waveformat200X 10-10andPhaseCorrect5-2
5-3.HarmonicandNon-HarmonicDistortionTestSetup5-3
5-4.EquipmentSetupforSynchronizationandDelayChecks5-4
5-5.5 MHzOutputStabilityTestSetup5-5
5-6.5065ASimplifiedBlockDiagram5-7
5-7.MeterResponseinERRORPosition5-10
5-8.WaveformatA8TP3withSeverePhaseShift5-12
5-9.R.F.AlignmentSetup5-13
5-10.OscilloscopeIndicationatResonancewithA8R43(ModulatingPhase
Adjustment)CorrectlyAdjusted5-13
5-11. Signal-to-NoiseTestSetup5-14
6-1. ModularCabinetParts6-2
v

Model5065A
ListofFigures
LISTOFFIGURES(Continued)
FigurePage
7-1. BatteryChargerAssemblyA2Option0027-3
7-2.A2BatteryChargerAssembly7-3
7-3.100kHzRegenerativeDivider7-8
7-4.A4100kHzDivider7-11
7-5.A4100kHzFrequencyDividerAssembly7-11
7-6.A1Waveforms7-21
7-7.SynthesizerAssemblyA1BlockDiagram7-21
7-8.A1SynthesizerAssembly7-23
7-9.PartofA1SynthesizerAssembly7-23
7-10.A1Waveforms7-25
7-11. SynthesizerA1Phase-LockedOscillatorSection7-25
7-12-A7ACAmplifierComponentLocator7-35
7-13.A7ACAmplifierSchematicDiagram7-35
7-14.TopOperatingControls7-37
7-15.A5DigitalDividerAssembly(Option001)7-39
7-16.A16DigitalDividerPowerSupplyAssembly7-41
7-17.A19LEDDigitalClockAssembly7-51
7-18.TopOperatingControls7-53
7-19.A5DigitalDividerAssembly7-55
7-20.A16DigitalDividerPowerSupplyAssembly7-57
8-1. SchematicDiagramNotes8-2
8-2.BlockDiagram8-3
8-3.FrontandRearPanelandTopInternalViews8-4
8-4.WiringDiagram(Sheet1 of3)8-5
8-5.BottomInternalView8-6
8-6.WiringDiagram(Sheet2 of3)8-7
8-7.WiringDiagram(Sheet3 of3)8-9
8-8.SynthesizerAssemblyA1BlockDiagramDigitalSection8-11
8-9.SynthesizerAssemblyA1DigitalSection(Sheet1 of2)8-17
8-9.SynthesizerAssemblyA1Phase-LockedOscillatorSection(Sheet2 of2)8-19
8-10.A2BatteryChargeAssembly(Option002and003)8-21
8-11. A3MultiplierAssembly8-25
8-12.A4100kHzFrequencyDivider8-27
8-13.A5DigitalDividerAssembly(Option001)(Sheet1 of3)8-33
8-14.A5A2MasterClockBoard(Option001)(Sheet2 of3)8-35
8-15.A5A3PresetClockBoard(Option001)(Sheet3 of3)8-37
8-16.A61 MHzFrequencyDividerAssembly8-41
8-17.A7ACAmplifierAssembly8-43
8-18.A8PhaseDetectorAssembly8-47
8-19,A9IntegratorAssembly8-49
8-20.A10OscillatorAssemblyBlockDiagram8-53
8-21. A11RVFRTemperatureControllerAssembly8-55
8-22.A12RVFRAssemblyandBufferA13AmplifierAssembly8-59
8-23.A14LogicAssembly8-63
8-24.A15PowerSupplyandRegulatorAssembly8-65
8-25.A16DigitalDividerPowerSupplyAssembly8-67
8-26.A19Series1740DigitalClockSchematicDiagram8-71
VI

Model5065A
ListofTables
LISTOFTABLES
rablePage
1-1. EquipmentSupplied1-2
1 -2. AccessoriesAvailable1-2
1-3.Specifications1-3
2-1. 115/230VoltConversion2-2
2-2. MatingConnectors2-3
3-1. OperatingChecks3-1
3-2.FrontPanelLampIndications3-4
3-3.FrequencyOffsetChangeInstructions3-6
3-4.TypicalFrequencyOffsetChange,Sample(Insufficient
MAGNETICFIELDControl)3-7
3-5.TypicalFrequencyOffsetChange,0X10-10Offsetto-300x10-103-8
3-6.OffsetFrequencySettings3-10
3-7.SynthesizerSettingvs.FrequencyOffset3-11
3-8.RecommendedTestEquipment3-11
4-1. LogicSignals4-3
5-1. AssemblyDesignations5-1
5-2.In-CabinetPerformanceCheck5-2
5-3.CircuitChecks5-8
5-4.SignalChecks5-10
5-5.RecommendedTestEquipment5-11
5-6.A5Troubleshooting5-17
6-1. TableofAbbreviations6-1
6-2.ReplaceableParts6-3
6-3.Option002and003ReplaceableParts6-21
6-4.Option001ReplaceableParts6-23
6-5.Options 001, 003OnlyReplaceableParts6-27
6-6.ManufacturersCodeList6-31
7-1. ManualChanges7-1
7-2.BatteryChargerReplaceableParts7-5
7-3.A4100kHzDividerReplaceableParts7-13
7-4.A1SynthesizerAssemblyReplaceableParts7-17
7-5.A1Troubleshooting7-26
7-6.A1Troubleshooting7-27
7-7.A1Troubleshooting
7-7.A1Troubleshooting7-28
7-8.A1Troubleshooting7-29
7-9.A7ACAmplifierAssemblyReplaceableParts7-32
7-10.A16ResistorPartsList7-38
7-11. A16ResistorPartsList7-52
7-12.A5A4PartsList7-58
vii

Model5065A
CircuitDiagrams,Theory,andMaintenance
Figure 1-1. Model5065AandAccessories
ShownwithOption003(001+ 002= 003)
ACPOWERCORD RACKMOUNTKIT
" i
ACCESSORYKIT
£T
1-0

Model5065A
CircuitDiagrams,Theory,andMaintenance
SECTIONI
GENERALINFORMATION
1-1. INTRODUCTION1-8.TERMINOLOGY
1-2.Description
1-3.TheHewlett-PackardModel5065ARubidium
VaporFrequencyStandardisa compact,self-contained
secondaryfrequencystandardwhichusesanoptically-
pumpedRubidiumvaporcellasthereferenceelement.
A5 MHzoscillatorisstabilizedagainsta natural
atomicresonance,thehyperfinetransitionof
Rubidium87.Thistechniqueproducesa long-term
stabilityofbetterthan1 x 10-"permonthwith
excellentshort-termstabilitywhichisconservatively
ratedatlessthan5 x 10-12rmsaveragedovera one-
secondperiod.Outputfrequenciesare5 MHz,1 MHz,
and100kHz.
1-4.FrequencysettingforanyoffsetoftheUTCtime
referenceisaccomplishedbychangingthemicrowave
excitationfrequencyandthemagneticfieldapplied
toanRb67vapor cell. Thumbwheelswitchcontrol
(ofa digitalfrequencysynthesizer)providesapproxi-
matestepadjustmentofthemicrowaveexcitation fre-
quencywitha rangeof1000partsin1010.Inaddition,
thefront-panelMAGNETICFIELDcontrolprovides
forexactadjustmentoftheRb87hyperfinetransition
witha resolutionof2 partsin1012.
1-5.Options
a.A digitalclock,Option 001, providesa clockdis-
playanda onepulsepersecond (1 PPS)electricaloutput.
Theclockpulsemayberetardedupto 1-second inincre-
mentsassmallas1-microsecondandaslargeas0.1-
second. Inaddition,a separatecontrolprovidescontin-
uousadjustmentofclock-pulsedelayfrom0-to1-
microsecond.
b.Standbybattery,Option002,providesa 10-
minuteminimumpowersource(at25°C)intheevent
ofexternalacpowerfailure.A front-panellamp
flasheswhenacpowerisinterruptedandlights con-
tinuouslyduringfastcharge.Chargerateis con-
trolledbya 3-positionfront-panelswitch;FAST,
CHARGE-FLOAT,RESET.
1-6.CircuitChecksandOutputs
1-7.TheCIRCUITCHECKswitchandmeterprovide
continuousmonitoringofoutputsandothersignals.
TheCONTINUOUSOPERATIONlampgivesan indi-
cationofcorrectoperation.The5 MHz,1 MHz,and
100kHzoutputlevelsareatleastt voltrmswhen
properlyterminatedwith50ohms.
1-9.Thedefinitionsofthefollowingtermsapplyto
thesetermsasusedthroughoutthismanual.
a.ATOMICTIME.Timescalebasedonthe
hyperfineresonanceofCesium133.
b.UNIVERSALTIME(UT2).Timescalebased
ontheearth'srotationaboutitsaxiswithcorrection
forangularpositionandseasonalvariations;proceeds
ata rateslightlyslowerthanAtomictime.
c.UNIVERSALTIME(COORDINATED)(UTC).A
piecewiseuniformscalewhichapproximatesUT2to
0.1-secondbystepadjustmentsinphaseasannounced
bytheBureauInternationalde I'Heure inParis.
d. HYPERFINERESONANCEOFRb87.Hyper-
fineresonantfrequencyarisingfromthedifference
inenergybetweentheupperandlowergroundstates
ofRb87.
e.RVFR(RubidiumVaporFrequencyReference).
TheassemblywhichhousestheRb87lamp,filter cell,
theRb87absorption cell, andtheharmonicgenerator/
mixerdiode.
1-10.SPECIFICATIONS
1-11. Table1-3liststhetechnicalspecificationsfor
theModel5065A.
1-12.Table1-1listsequipmentsuppliedandTable
1-2listsaccessoriesavailablefortheModel5065A.
1-13.INSTRUMENTIDENTIFICATION
1-14.Hewlett-Packardusesa two-sectionnine-digit
serialnumber(0000A00000)mountedontherear-
paneltoidentifythisinstrument.Thefirstfourdigits
aretheserialprefixandthelastfivedigitsrefertothe
specificinstrument.Iftheserialprefixonyourinstru-
mentdiffersfromthatlistedonthetitlepageofthis
manual, differencesexistbetweenthemanualand
yourinstrument.Lowerserialprefixesaredocumented
inSectionVIIandhigherserialprefixesarecovered
bya manualchangesheetincludedwiththemanual.
IfthissheetismissingcontactthenearestHewlett-
PackardSalesandServiceoffice(listsareprovided
attherearofthismanual). 1-1