Tektronix 494A User Manuals

Table of Contents

• Verificationof ToleranceValues

  41
• PREPARATTON

  4
• Replacing Fuses

  12
• OscillatorAccuracy

  46
• 3. CheckCounterSensitivity

  4
• 6. CheckResidualFM

  4
• 8. CheckMarkerAccuracy

  4
• Accuracy

  4
• and ShapeFactor

  4
• 13.CheckNoiseSidebands

  4
• 14.CheckFrequency Response

  4
• UltimateRejection

  4
• Section3 INSTALLATION 17. CheckRF AttenuatorAccuracy

  4
• coNNECTtNGPOWER

  32
• SpuriousResponse

  4
• 24.CheckLO Emission

  4
• WaveguideBands

  5
• point

  4
• 18. AdjustOption42 Module

  5
• 29.CheckVERTOUTPUTSignat

  4
• TNTRODUCTTON

  6
• lnstrument from its Cabinet

  6
• oPTloN TNSTRUMENTS

  434
• static-sensitivecomponents

  6
• CalibratorOutput

  4
• ElapsedTimeMeter

  6
• Frequency Response

  4
• PROGRAM

  4
• Memory

  6
• Aids

  6
• LocatorCharts

  6
• Diagnostics

  6
• Techniques

  6
• HighVoltageCircuits

  5
• DiodeChecks

  6
• Steps

  6
• DTAGNOSTTCS

  6
• 7. AdjustLog Amplifier

  5
• Introduction

  6
• andShapeFactor

  5
• Display

  6
• 10.AdjustCalibratorOutputLevet

  5
• Control

  6
• Components

  6
• Parts

  6
• CoaxialBands

  5
• Program

  6
• Enor MessageReadout

  6
• or ROMDevices

  6
• Surface-Mounted Components

  616
• Components

  617
• VCOAdjustment

  6
• (VideoProcessor)

  6
• MicrocomputerSystemTest

  6
• AddressBus Test

  6
• Semi-rigidCoaxialCables

  622
• Bus

  6
• Assembtyin the 1st Mixer

  622
• MernoryAddressDecoders

  6
• Clocksahd ControlLines

  6
• Front-PanelBoardRemoval

  624
• Pushbutton Switches

  624
• MainPowerSuppty Instrument Bus Registers,

  6
• ModuleRemoval

  624
• HighVottagepower Supply

  625
• t

  625
• FanAssembtyRernovaf

  6
• ReturnLossCalibration

  6
• 110MHz ThreeCavityFitter

  629
• DigitalControl Section

  7
• SECTTON

  74
• lst Mixer

  74
• 10 dB GainSteps

  7
• 20 dB GainSteps

  7
• VR MotherBoards

  7
• PrecisionExternalCables

  7
• PostVR AmplifierCircuit

  7
• LOG AMP and DETEGTOR

  7
• 2NDLO

  7
• Oscillator

  7
• LinearModeCircuits

  7
• PulseStretchCircuit

  7
• ldentifyCircuit

  7
• DigitalControlCircuit

  7
• Board

  7
• SidebandAdapter

  7
• VerticafSection

  740
• Address Decoding

  7
• 719 MHz OutputCircuit

  7
• Update Marker Circuits

  746
• Memories

  7
• InputSwitching

  7
• AMPLIFIERS

  7
• SwitchDriver

  7
• Z.AXISANDRF INTERFACE

  7
• RF InterfaceCircuits

  749
• Z-AxisCircuits

  749
• powerSupplyMonitor

  7
• Bias

  7
• DigitafControlCircuits

  7
• SUPPLY

  750
• lF Offset

  7
• High-Vottage Osciilator

  7
• Z_AxisGtipper

  751
• Readout

  751
• SwitchDriver.,

  7
• Modes

  7
• CharacterGenerator DigitalControl

  7
• lnstrument Bus Interface

  7
• Amplifier

  7
• SpanAttenuator

  7
• CenterFrequency Control

  7
• 1st LO Driver

  7
• the lF

  7
• DigitalControt

  761
• MarkerDAC

  762
• ServiceRequestCircuits

  7
• Multiplexer

  7
• +2n Gounter

  7
• 21-bitCounter

  7
• Digital-to-Analog Converter

  765
• PhaseLock

  7
• DecadeAttenuator

  766
• OffsetMixer

  7
• ErrorAmplifier

  7
• StrobeDriverCircuit

  7
• DtctTALCONTROLSECTTON

  788
• Line InputCircuits

  7
• InverterLogic

  7
• PIA and lnstrumentBus

  7
• Fan DriveCircuits

  7
• RAM

  7
• Rectifier-FilterCircuits

  7
• Options

  7
• ROM Banksand GptB

  7
• RegulatorCircuits

  7
• AddressDecoder

  7
• BankSelector

  7
• BankROMs

  7
• GPfA

  7
• OptionBl ServiceManuals

  8
• R€gistersand LEDs

  7
• and WanantyOptions

  8
• Scanningthe Keyboard

  7
• Option39 AlternateBattery

  84
• Option41 DigitalRadio

  8
• MainScanRoutine

  7
• Option42110 MHz lF Output

  8
• Subroutine

  7
• Option52 North American220V

  8
• Subroutine Check

  7
• OutputSubroutine

  7
• from 0.01GHzto 1 GHz.

  4
• Crt displayat initialpower-up

  4
• the 1st LO tocked.

  4
• r e s i d u aFl M . . . . . . . . . . . . .

  4
• measuringSpan/Divaccuracy

  4
• test pointlocations.

  5
• Time/Divaccuracy.

  4
• locationson HighVoltagemodule

  5
• Time/Divaccuracy.

  4
• Amplifier

  5
• response.

  4
• adjustingsweeptiming.

  5
• response.

  4
• andtestpointlocations.

  5
• pointand adjustmentlocations

  5
• 4-14 RF attenuatortest equipm€ntsetup

  4
• P3035on the VideoProcessorboard.

  5
• the LogAmplifier.

  5
• and adjustment locations

  5
• VariableResolution module.

  5
• inputcharacteristics.

  4
• and connectorlocations.

  5
• 6-26 FirstConvertersetupfor adjustment

  6
• andtest pointlocations.

  649
• connectors

  6
• in relationto O'XXX.

  6
• thirdand fourthresonators

  7
• in the 829 MHz 2ndConverter

  7
• stagelog amplifier.

  7
• Simplifiedspandecadeattanuator

  7
• DACvariancegraph.

  7
• Simpfffiedtune voltageconverter

  7
• 7-27 Simplifiedschematicof harmonicmixer

  7
• 7-28 Block diagramof a basic synthesizer

  7
• Systemmemorymap.

  7
• crt readout.

  7
• 7-18 Characteron/offtiming

  7
• on the Memoryboard.

  7
• input/outputwaveforms.

  7
• Timingwaveformsfor soft-startcircuit.

  7
• Powercord options

  8
• MIXERS

  1
• STARTSPURAMPLITUDE

  645
• ROMTEST

  6
• 4.1 EQUIPMENT REQUIRED

  4
• CHECK

  4
• 44 FREQUENCY RESPONSE CHECK 7-4 GAINSTEPCOMBTNATTONS

  7
• .,

  4
• COMBINATIONS

  7
• U2039TRUTHTABLE

  7
• TRUESIGNALLEVEL

  4
• t

  427
• CODES

  7
• EQUIPMENTREQUIRED

  5
• powER suppLy ToLERANCES

  53
• SELECTTONCODES

  7
• CODES

  7
• DAMAGE

  61
• POLLBITS

  7
• DATA

  7
• C O M P O N E N T. .S. . . . . . . . . . .

  617
• CoDE/FUNCT|ON TABLE

  7
• CHARACTERTSTTCS

  8