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Tektronix 1705A instruction manual Theory of Operation

Models: 1705A

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Theory of Operation

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1705A Spectrum Monitor

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Tektronix 1705A instruction manual Theory of Operation

Contents

1705A Spectrum Monitor SN B040000 and Above 070-8222-08 Table of Contents Installation Table of ContentsTheory of Operation 1705A Spectrum Monitor Iii Checks and AdjustmentsOptions MaintenanceReplaceable Electrical Parts Replaceable Electrical PartsReplaceable Mechanical Parts 10-1 Simulation of a 1705A Full SPAN/DIV display List of Figures1705A Spectrum Monitor Vii Considerations for custom installation of an instrumentViii List of TablesGeneral Safety Summary General Safety Summary Service Safety Summary Service Safety Summary Xii Installation PrefaceIntroduction Replaceable Mechanical Parts Contacting Tektronix PrefaceUSA Preface Xvi Introduction Page Section Introduction Typical ConfigurationsOptions AccessoriesIntroduction #73Optional Accessories Safety InformationSpectrum Display SPAN/DIVFull Power Source Introduction Spectrum DisplayCRT Display Physical Characteristics Introduction Environmental CharacteristicsCertifications and Compliances EMCCAT Introduction Certifications and CompliancesMeters Applications Earth SUN SatelliteUsing the 1705A for Satellite Communication Vancouver BC Seattle Portland Helena Boise SAN Francisco Band Input SignalsLOS Angeles SAN DiegoZeroing in on a Satellite Tek 12.20 GHZ Frequency and Number Down Link Transponder Horizontal Vertical PolarizationGHZ Looking at Exciters with the 70 MHz InputMiscellaneous Uses for the 1705A Band LNB OUTSplitter InputOperating Instructions Page Section Operating Instructions Front-panel Controls and IndicatorsOperating Instructions Position PowerFilter Input DisplaySPAN/DIV Variable control that adjusts the display brightnessPosition Rear- Panel ConnectorsSpectrum Monitor Holder for the instrument’s mains fuse1400 MHZ Powering- up1705A graticule scale Measurement GraticuleVoltage Ratio Power Ratio Reading in dB Voltage Ratio Power RatioOperating Instructions DB Reference Reading in dBOperating Instructions DBm to v Conversion Reading in dBm 75Ω 50ΩMinimum Maximum Frequency MIDFrequency Scale = 10 Divisions Sweep Length = 12 Divisions Center Frequency Readout 70 MHZMHZ 1400 MHZ Center Frequency Tuned AT this Point Point on Trace That Corresponds toCustomizing Frequency Readout Offset Adjust Readout ModeMain Menu Readout Position12.00 GHZ Locating Ku- Band Satellites Basic Operating ProcedureSatcom K2 G-STAR City1705A Spectrum Monitor Operating Instructions Page Page Installation Page Electrical Installation Section InstallationInstallation Mechanical InstallationLNB Power Band Input OFF Cabinet Options875 250105 130Cabinetizing 1700F02 portable cabinet dimensionsCabinet Securing Screws A WFM7F05 with a blank front panel 1700F06 1700F07 1705A Spectrum Monitor Theory of Operation Page Block Diagram Section Theory of OperationOverview Theory of Operation Front Panel Diagram RF Input Diagram If Amplifier Diagram Resolution Filter and Log Detector Sweep Generator Diagram Start Display Deflection Amplifiers Diagram Vertical Deflection Amplifier Microprocessor Diagram Front Panel Diagram High Load LOW Load AverageLow Voltage Power Supply Diagram Pulse Width Modulator Theory of Operation High Voltage Power Supply Diagram Axis Amplifier Pinout of the CRT Socket 1705A Spectrum Monitor CRT The pinout for the CRT is shown in FigureTheory of Operation Checks and Adjustments Page Section Checks And Adjustments Recommended Equipment ListElectrical Instruments Auxiliary Equipment Short-Form Procedure Checks and Adjustments SMA Male-to-bnc Female AdapterPerformance Check 1705A Spectrum Monitor Long Form Procedure Checks and Adjustments Preliminary Control Settings Page Marker Here Marker is +/-- 1 Minor Division from Here Checks and Adjustments 1705A Spectrum Monitor Page Variable Autotransformer L-BAND Input Marker Here Graticule Line DisregardUHF Sine Wave Generator Page End of the Performance Check Procedure Short- Form Procedure Adjustment ProcedureVideo SPAN/DIV Full Center Frequency Preliminary SetupA3 Main BD FrontA1 PWR Sply BD Tek Remove the shorting strap 1705A Spectrum Monitor ShortingStrap 1705A Spectrum Monitor Page 1705A Spectrum Monitor Page 1705A Spectrum Monitor End of Adjustment Procedure Checks and Adjustments Maintenance Page Cleaning Section MaintenanceLOW Power Schott Schottky SignalCmos ECLTroubleshooting Diagnostic Routines Nonvolatile 2444 RAM Test Reading Data Stored AT 60H to 7F in Processor Error Cannot Read or Write Press Input KEY to Exit Troubleshooting Aids Circuit board assembly locations Major Assembly Interconnection PIN ROW B ROW aPower Supply Fault Symptoms Power Supply Troubleshooting ProcedureLow Volts Supply Maintenance Power Supply Fault SymptomsMaintenance Rectifier/Switcher Check High Volts Supply Focus Amplifier Check Maintenance High Volts Supply Fault SymptomsAxis Amplifier Check Grid Drive CheckCRT Voltage Check High Voltage Oscillator CheckObtaining Replacement Parts Corrective MaintenanceMechanical Disassembly/Assembly Maintenance Test Selectable ComponentsBezel Removal Graticule Light Removal and Replacement Replacing the CRT Removal of the CRTRemoval of the Rear Panel Removal of Front- Panel AssemblyRemoving the L- Band Tuner Removal Replacement of the Main Board Removal Replacement of the Power Supply Board Front Removing the LNB Power Supply BoardRepackaging 1705A Spectrum Monitor Options Page Power Cord Options Field Upgrade KitsPower Cord Options Description of power cord Section OptionsOrdering Replaceable Electrical Parts Page Using the Replaceable Electrical Parts List Section Replaceable Electrical PartsParts Ordering Information Tektronix Part No Column DescriptionsColumn Column 3Cross Index MFR. Code Number to Manufacturer Spectrum Control INC Weight STAMP INC Fulling Mill Harrisburg PA MSD INC Orange ST DARLINGTON, SCSobudai Zawa Kanagawa 228 Japan Zman & AssociatesChrome Shibaura Tokyo Japan 2ND Floor NEW Kyoei MINATO-KU Wilhelm WestermanCircuit BD ASSY18V Power Supply Circuit BD Assypower SUPPLY, 1705ACircuit BD Assyfront Panel Circuit BD Assymain Board ASSY,1705ACAP,FXD,PLSTC100PF,5%,1600VDC/500VAC IAL,MIIN,BULK CAP,FXD,CER DI470PF,20%,100V TUBULAR,MIA1DS1 LAMP,GLOW135V MAX,1.9MA,C2A-T,WIRE LeadA1DS2 A1DS3SQ,SIDE ADJUSTT&R SQ,TOP AdjustbulkRES,FXD,CMPSN1.5M OHM,5%,1W RES,FXD,CMPSN2.2M OHM,5%,0.5WIAL,T&R,SMALL Body RES,FXD,FILM5K OHM,0.1%,0.2W,TC=T9REELED,SMALL Body RES,FXDMETAL FILM,100K OHM,1%,0.2W,TC=100WIRED,1705A SQ,TOP ADJUST,T&RRES,THERMAL5 OHM,10%,7A/DEG C RES,FXD,CMPSN2.4K OHM,5%,2WPart of A2DS313 LED ASSYDIR1CA ASSY,SP,ELEC34,26 AWG,5.0 L RES,VAR,PNLCP,20K OHM,20%,0.5W,LINEAR,WPLATE,ELEC Shldcircuit Board BUS,CNDCTSHIELD,ELECCIRCUIT Board SHIELD,ELEC1705A,BRSUVX1H330MAA CAP,FXD,ELCTLT33UF,+50-20%,35WVDCCAP,VAR,CER DI9-45PF,200V CAP,VAR,PLSTC1-3.5PF,500VA3CR1 CAP,FXD,MICA DI98PF,5%,500VA3CR2 DIO,SIGFAST RCVRY70V,200MA,100NS,COMFLTR,BANDPASS A3FL1A3FL2 A3FL3COIL,RFFIXED,15NH COIL,RFFIXED,45NHCOIL,RFFIXED,64UH COIL,RFFIXED,505NHADJUSTT&R GF06UT 2KRES NTWK,FXD,FI10K OHM,20%,9RES GF06UT 5K RES,FXD,FILM115K OHM,1%,0.2W,TC=T0 RES,FXD,FILM237K OHM,1%,0.2W,TC=T0RES,FXD,FILM3.4K OHM,1%,0.2W,TC=T0 RES,VAR,NONWWTRMR,250 OHM,20%,0.5W LIN RES,FXD,FILM7.5K OHM,1%,0.2W,TC=T0Percent RES,FXD,FILM1M OHM.1%,0.2W,TC=T0CRB20FXE1K62 CRB20FXE9K35RES,VAR,NONWWTRMR,100 OHM,20%,0.5W LIN RES,FXD,FILM2.1K OHM,1%,0.2W,TC=T0RES,FXD,WW6.3K OHM,1%,3W CRB20FXE210EGF06UT 1K Loss 10DB,PKG 7.2MM SQ,6.8MM HI RES,FXD,FILM187K OHM,1%,0.2W,TC=T0IC,CONVCMOS,A/D8-BIT,32US,SAR,DIFF IN,SER MICROCKT,DGTLMICROCOMPUTER,8 BITIC,LINBIPOLAR,AMPLRF AMP,20DB IC,MISCCMOS,ANALOG Swquad SPST,100IC,DGTLTTL,BFR/DRVRHEX INV, OC, HI MIXER,FREQ1-500MHZCTR,0.385 H,30 GLD,BLK,JUMPER CONN,BOXSHUNT/SHORTINGFEM,STR,1 X 2,0.1TAIL,30 GLD IAL,MI,T&RRES,FXD,WW1 OHM,5%,2W RES,FXD,FILM267K OHM,1%,0.2W,TC=T0Order by Desc RES,FXD,CMPSN1K OHM,5%,0.50WCONN,HDRPCB/WIREWRAP,MALE,STR,1 X 4,0.150 CONN,HDRPCB/WIREWRAP,MALE,STR,1 X 7,0.15CORE,EMTOROID,FERRITE COIL,RFFIXED,150NHControlled 0LUA3 A10SKT1CONN,RF Plug CA ASSY,SPReplaceable Electrical Parts Diagrams/Circuit Board Illustrations Page Symbols Diagrams/Circuit Board IllustrationsAssembly Numbers Component ValuesPage 1705A Spectrum Monitor A3 Main Board Component Locator With cross-references to schematic diagrams 1, 2, 3, 4,A5 70 MHz Tuner Board A3 Main BoardSchematic Diagram 1 Component Locator Chart 1705A Spectrum Monitor RF Input Local OscillatorSchematic Diagram 2 Component Locator Chart 1705A Spectrum Monitor If Amplifier Resolution Filter & LOG DetectorSchematic Diagram 3 Component Locator Chart Ramp Generator Band LinearityMarker GeneratorSchematic Diagram 4 Component Locator Chart Amplifier DeflectionFilter BuffersSchematic Diagram 5 Component Locator Chart Microprocessor 1705A Spectrum MonitorMicroprocessor TraceSchematic Diagram 6 Component Locator Chart A2 Front Panel Board 1705A Spectrum Monitor Front Panel & 18V SupplyA1 Power Supply Board A1 Power Supply Board Component LocatorSee Parts List for Effective Serial Number Ranges Error SwitcherLine Rectifier Output FiltersA10 CRT Socket Board Front of Board Schematic Diagram 8 Component Locator Chart1705A Spectrum Monitor High Volts Power Supply Error AMPHV OSC Grid DrivePage Replaceable Mechanical Parts Page Section Replaceable Mechanical Parts Using the Replaceable Mechanical Parts ListReplaceable Mechanical Parts Qty ColumnThis indicates the quantity of mechanical parts used Indicates actual manufacturer’s part numberRichco Panduit Corp RidgelandCHICAGO, IL Nelson Name Plate CO CasitasCOVER,HOUSINGALUMINUM Circuit BD Assypower Supply See A1 Repl Mounting PartsFRAME,CRTBEZEL SCREW,MACHINE6-32 X 0.875,PNH,SSTFRAME,CHASSISSAFETY Controlled HOUSING,CKT BdaluminumSCREW,MACHINE6-32 X 0.188,PNH,STL IN/OUT See A6 Repl Mounting PartsCLAMP,LOOP0.375 ID,PLASTIC,SAFETY CON Trolled Standard AccessoriesStandard only Optional Accessories CA ASSY,CRTDISCRETE,ANODE LEAD,CRT,1,22A10