Symmetricom X72 Rubidium Oscillator原子钟使用技术手册

X72RubidiumOscillatorDesigner’sReferenceandUserGuideRevisionA–November2004PartNumber097-10603-01Symmetricom,Inc.2300OrchardParkwaySanJose,CA95131-1017U.S.A.©1999–2004Symmetricom,Inc.Allrightsreserved.PrintedinU.S.A.Allproductnames,servicemarks,trademarks,andregisteredtrademarksusedinthisdocumentarethepropertyoftheirrespectiveowners.Contents097-10603-01Rev.A–November2004X72Desiger’sReferenceandUser’sGuide3PurposeofThisGuide...........................................12WhoShouldReadThisGuide......................................12StructureofThisGuide...........................................12ConventionsUsedinThisGuide....................................13Warnings,Cautions,Recommendations,andNotes....................14RelatedDocumentsandInformation.................................15WheretoFindAnswerstoProductandDocumentQuestions.............15What’sNewInThisGuide.........................................15Chapter1DescriptionOverview......................................................18TypicalApplications.............................................19Specifications..................................................21Chapter2DesignIntegrationConsiderationsMechanicalConsiderations........................................28MountingRecommendations..................................28RecommendedMatingConnectors.............................28IntegratingtheX72intoaSystem...............................29ThermalConsiderations..........................................34ThermalTape..............................................34WaterCondensationandExcessiveHumidity.....................35ExcessiveDust.............................................35ExternalInterfacesandGrounding..................................35ElectricalInterface...............................................36X72RFOutputs............................................36X721PPSInputandOutput..................................36LockSignal................................................36ServiceSignal..............................................37X72FrequencyControlSignal.................................37X72ACMOSOutputFrequency................................37FrequencyControlAnalog........................................38GreaterThan±1xE–9InternalorExternalControl..................38TimeResponseofExternalFrequencyControl....................38TemperatureCompensationofFrequency........................38ModifiableUnitSettings..........................................394X72Desiger’sReferenceandUser’sGuide097-10603-01Rev.A–November2004X72SusceptibilitytoInputNoise....................................40InputFiltering..............................................40X72ReliabilityandMaintenance....................................41Reliability.................................................41Maintenance...............................................41Chapter3InstallationandOperationInstallation.....................................................44SiteSelection..............................................44Turn-onProcedure..........................................44Start-upSequence..............................................45TheoryofOperation.............................................47Troubleshooting................................................48Repairs.......................................................48X72Warranty..............................................49AppendixAX72J1ConnectorandPlugMolexConnector................................................52MolexConnectorPlugAssembly...................................53EdgeBoardPinout..............................................543.25InchInterfaceCable.........................................55EdgeBoardLayoutDrawing.......................................56AppendixBSymmetricomSerialInterfaceProtocolUsingtheSymmetricomSerialInterfaceProtocol.......................58HostTerminalEmulatorSetup.................................58DataFormat...............................................58FactoryMode..............................................61FloatingPointNumberRepresentation...........................61AppendixCUsingtheX72Developer’sKitIntroduction...................................................68MountingtheX72Unit.......................................68InterfaceCabling/CircuitCards.................................68SymmetricomSerialInterfaceProtocol(SSIP).........................69Turn-onProcedure..........................................69Start-upSequence..............................................72097-10603-01Rev.A–November2004X72Desiger’sReferenceandUser’sGuide5X72DevelopmentKitHardware....................................73TestAdapterBoardandEdgeAdapterCards.....................73AppendixDOnePulsePerSecondSourceConnectionConnectionRequirements.........................................78Background...................................................78X721PPSFunctions............................................79SystemRequirements.........................................