HP 8719A Manual de usuario

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Errata

Title & Document Type: HP 8719A, 8720A/B Microwave Network Analyzer

Service Manual

Manual Part Number: 08720-90108

Revision Date: 1990-09-01

HP References in this Manual

This manual may contain references to HP or Hewlett-Packard. Please note that Hewlett-

Packard's former test and measurement, semiconductor products and chemical analysis

businesses are now part of Agilent Technologies. We have made no changes to this

manual copy. The HP XXXX referred to in this document is now the Agilent XXXX.

For example, model number HP8648A is now model number Agilent 8648A.

About this Manual

We’ve added this manual to the Agilent website in an effort to help you support your

product. This manual provides the best information we could find. It may be incomplete

or contain dated information, and the scan quality may not be ideal. If we find a better

copy in the future, we will add it to the Agilent website.

Support for Your Product

Agilent no longer sells or supports this product. You will find any other available

product information on the Agilent Test & Measurement website:

www.tm.agilent.com

Search for the model number of this product, and the resulting product page will guide

you to any available information. Our service centers may be able to perform calibration

if no repair parts are needed, but no other support from Agilent is available.

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MICROWAVE

NETWORK ANALYZER

SERVICE MANUAL

SERIAL

NUMBERS

This manualapplies directlyto network analyzers with these

serialnumber prefixes:

8719A: 3029A

8720A: 2914A

87208: 3029A

For additional information,see

Instrument

History

section of

this manual.

@Copyright HEWLElT-PACKARD COMPANY 1989

1400FOUNTAINGROVEPARKWAY,SANTA ROSA, CA 95403 U.S.A.

MANUALPART NO. 08720-90108

MicrofichePart Number 08720-90106 Printed: SEPTEMBER 1990

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CERTIFICATION

Hewlett-PackardCompany certifiesthatthisproductmetitspublishedspecificationsatthetimeofshipmentfrom

the factory. Hewlett-Packardfurther certifiesthatitscalibrationmeasurementsare traceableto the UnitedStates

NationalInstituteof Standards and Technology (NIST, formerly NBS), to the extent allowed by the Institute's

calibrationfacility, andto the calibrationfacilities of other InternationalStandardsOrganizationmembers.

WARRANTY

This Hewlett-Packardsystem product iswarranted againstdefects inmaterialsandworkmanshipfor a period

corresponding to the individual warranty periods of its component products. Computer and computer

peripheralsarewarrantedfor aperiodof

days.Instrumentsarewarrantedfor aperiodof oneyear. Duringthe

warrantyperiod,Hewlett-PackardCompanywill,at itsoption,eitherrepairorreplaceproductswhichprovetobe

defective.

Warranty servicefor products installedby HPandcertainotherproductsdesignatedby HPwill beperformedat

Buyer'sfacilityatnochargewithin HPservicetravelareas.OutsideHPservicetravelareas,warrantyservicewill'

be performed at Buyer's facility only upon HP's prior agreement and Buyer shall pay HP's round trip travel

expenses. Inall other areas, products must

returnedto a service facilitydesignatedby HP.

Forproductsreturnedto HPfor warranty service,Buyershall prepayshippingchargesto HPand HPshallpay

shipping charges to returnthe product to Buyer.However,Buyer shall pay all shipping charges, duties, and

taxes for products returnedto HP from another country.

HP warrants that its software and firmware designated by HP for use with an instrument will execute its

programminginstructionswhenproperly installedonthatinstrument.HPdoesnotwarrantthattheoperationof

the instrument,or software, or firmware will

uninterruptedor error free.

LIMITATIONOF

WARRANTY

Theforegoingwarrantyshallnotapplytodefects resultingfrom improperor inadequatemaintenanceby Buyer,

Buyer-suppliedsoftware orinterfacing,unauthorizedmodificationor misuse,operationoutsideof the environ-

mentalspecificationsfor the product, or improper site preparationor maintenance.

NO OTHER WARRANTY IS EXPRESSEDOR IMPLIED. HP SPECIFICALLY DISCLAIMSTHE IMPLIEDWAR-

RANTIESOR MERCHANTABILITYAND FITNESSFOR A PARTICULARPURPOSE.

EXCLUSIVEREMEDIES

THE REMEDIESPROVIDEDHEREINARE BUYER'SSOLE AND EXCLUSIVEREMEDIES. HP SHALL NOT BE

LIABLEFORANY DIRECT.INDIRECT,SPECIAL,INCIDENTAL,OR CONSEQUENTIALDAMAGES,WHETHER

BASED ON CONTRACT, TORT, OR ANY OTHER LEGALTHEORY.

ASSISTANCE

Productmaintenanceagreementsandother customer assistanceagreementsareavailable for Hewlett-Packard

products.

Foranyassistance,contactyournearestHewlett-PackardSalesandServiceOffice.Addressesareprovidedatthe

backof this manual.

BFZ4A.2

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SAFETY CONSIDERATIONS

GENERAL

Thisproductandrelateddocumentationmustbe

reviewedfor familiarizationwithsafetymarkings

and instructionsbeforeoperation. This product

has been designed and tested in accordance

with internationalstandards.

SAFETY SYMBOLS

Instructionmanual symbol: the

productwill

markedwiththis

symbolwhen itisnecessaryfor

the user to refer to the instruc-

tion manual (refer to Table of

Contents).

Indicateshazardous voltages.

Indicatesearth(ground)terminal.

The WARNING sign denotes a

hazard. Itcalls attentionto a pro-

cedure, practice, or the like,

wtiii,

not

correctly

performed

oradheredto, couldresultinper-

sonal injury. Do not proceed

beyondaWARNINGsignuntilthe

indicated conditions are fully

understoodand met

The CAUTION sign denotes a

hazard. It calls attention to an

operatingprccedure,

practice,

thelike,which, ifnotconed)'

per-

formed or adhered to, could

resulindamage

ordestruction

part

all

ofthe

product

not

proceedbeyondaCAUTIONsign

untilthe indicatedcontiisare

fully understood

and

met.

BEFORE APPLYINQ POWER

Verifythatthe productisconfiguredtomatchthe

availablemainpowersourcepertheinputpower

configurationinstructionsprovidedin.this man-

ual.

If this product is to

enernized via an auto-

transformer,make sure the &mmon terminal is

connected to the neutral(grounded side of the

mains supply).

SERVICING

Any servicing, adjustment, maintenance,

orrepairofthisproductmustbeperformed

onlybyquallffedpersonnel.

Adjustments describedinthismanualmay

performedwith powersuppliedto the

product while protective covers are

removed. Energyavallableatmany points

may, ifcontacted, resultinpersonalinjury.

Capacitorsinsidethisproductmayst111

charged even when disconnected from

theirpowersource.

To avoida ffre hazard, only fuses with the

requiredcurrentratingandofthespecified

type(normalblow, time delay, etc.) areto

beusedfor replacement.

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8719A

and

8720A/B

Service

Manual

TABLE

OF CONTENTS

SERVICE AND EQUIPMENT OVERVIEW

Introduction

.........................

Organizationof the Service Manual

.....

Table of Service Test Equipment

.......

PREVENTIVEMAINTENANCE

.........................

Introduction 1

Check the Front Panel Connectors

......

Check the Error Terms

...............

......

Performa Full 2-Port Calibration 2

...............

Plotthe ErrorTerms 2

Cleanthe Fan Filter

.................

................

Cleanthe Glass Filter 4

VERIFICATION

Operator's Check

.........................

Introduction 1

.........................

Description 1

.........................

Equipment 2

.........................

Procedure 2

.................

InCase of Difficulty 3

Connector Care

..................

System Verification

........................

Description 5

.....................

VerificationKit 5

System VerificationCycle and

Kit Recertification

................

.............

Measurement Uncertainty 6

.........................

Equipment 6

.........................

Procedure 8

.......................

Initialization 8

............

MeasurementCalibration 9

................

System Verification 11

...............

Connecting Devices 11

...................

InCase of Failure 12

..............

Connectingthe Airlines 13

3.5mm

............................

.............................

7mm 16

...........................

Type-N 19

Performance Tests

.......................

Introduction 23

.............

PerformanceTest Tools 23

..................

CalibrationCycle 24

..........

If the InstrumentFails a Test 24

Frequency Range and Accuracy

................

PerformanceTest 25

.......................

Equipment 25

Descriptionand Procedure

.........

If the Instrument Failsthis Test

......

........

Power Level PerformanceTest 26

.......................

Equipment 26

.........

Descriptionand Procedure 26

If the Instrument Failsthis Test ......27

Dynamic Range PerformanceTest

.....

.......................

Equipment 28

.........

Descriptionand Procedure 28

If the InstrumentFailsthis Test ......28

PerformanceTest Record

............

Option003 PerformanceTest Record .

ADJUSTMENTS

.........................

Introduction 1

.................

Order of Adjustments 1

.....................

Test Equipment 2

............

InstrumentCover Removal 2

A9 CC (CorrectionConstant)

...................

Jumper Position 2

......

A9 CC Jumper Position Procedure 3

HP 8719A/20B DisplayPositionand

.................

FocusAdjustments 4

Descriptionand Procedure

HP 8719A/20B DisplayDegausing

...................

(Demagnetizing) 5

........................

Equipment 5

..........

Descriptionand Procedure 5

HP8719A/20B Display lntensity

......................

Adjustments 6

........................Equipment 6

..........

Descriptionand Procedure 6

HP8720A Display lntensity and Focus

...............

CorrectionConstants 9

..........

Descriptionand Procedure 9

....

Serial NumberCorrection Constant 10

.........

Descriptionand Procedure 10

...

Option NumbersCorrection Constant 11

.........

Descriptionand Procedure 11

......

Analog Bus Correction Constants 13

.........

Descriptionand Procedure 13

......

IFAmplifier Correction Constants 13

.......................

Equipment 13

.........

Descriptionand Procedure 13

....

ADC LinearityCorrection Constants 14

Equipment

.......................

.........

Descriptionand Procedure 14

HP 8719

and

HP 8720

Table of Contents

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ADJUSTMENTS

(cont'd)

Source PretuneCorrectionConstants

Equipment

......................

Description and Procedure

.........

EEPROM BackupDisk Procedure

.....

Equipment

......................

Descriptionand Procedure

.........

How to Make an EEPROM Backup

Disk and StoreCorrection Constant

Datato it

.......................

Howto RetrieveCorrection

Constant Datafrom

the EEPROM BackupDisk

........

HP 8720A Display ImageSize. Position

and Trace AlignmentAdjustments

...

Descriptionand Procedure

.........

ReferenceAssembly VCO Tune

Adjustment

......................

Equipment

......................

.........

Descriptionand Procedure 19

......

Frequency Accuracy Adjustment 20

Equipment

......................

.........

Descriptionand Procedure 20

Sampler Check

....................

.........

Descriptionand Procedure 21

A Sampler Check

.................

B Sampler Check

................

R Sampler Check

................

Power Adjustments

.................

......................

Equipment 23

....

Low Band Power LevelAdjustment 23

.........

Descriptionand Procedure 23

Automatic LevelingControl Adjustment

.........

Descriptionand Procedure 26

Optional Fractional-NSpur and

FMSidebandAdjustment

..........

......................

Equlpment 27

.........

Descriptionand Procedure 27

Cal Kit DefaultsCorrectionConstants

........

Descriptionande Procedure 29

RevA.O1.OO Descriptionand Procedure 30

TROUBLESHOOTING AND

BLOCK DIAGRAM

Introduction

........................

InitialObservations

..................

TroubleshootingHP-IBSystems

.......

TroubleshootingSystems with

...............

MultiplePeripherals 3

TroubleshootingSystemswith

Controllers

......................

Overall Block Diagram

...............

ISOLATE FAULTY GROUP

Introduction

........................

......................

Power Supply 1

Digital Control

......................

............................

Source 2

Receiver

..........................

.......................

Accessories 3

IsolateFaulty Group Worksheets

......

POWER SUPPLY

Introduction

........................

LED State Definitions

..............

Start Here

.........................

Fan

.............................

Power Supply Error Messages

......

Check A15 Preregulatorand Loads

.....

Check A15 Green LED on Rear Panel

DisconnectA15W1 and Check

.......

Check A15 and +5V Loads

.........

RemoveA51 Loads

................

Check A15W1 Voltages

.............

Check A8 Post-Regulator and Loads

...

CheckFan

.......................

Check Display

....................

Check Assemblies Loading

...................

+7.5V Supply 7

A8 LEDs Are NotAll On

..............

Check A8 Alone

...................

?..$.

Check Upper Box Assemblies

.......

Check Lower BoxAssemblies

.......

Check the Display

.................

Check the RemainingLoads

......................

andTraces 9

FanTroubleshooting

................

MeasureA8 Fan Voltages

..........

MeasureA15 Fan Voltages

..........

Display PowerTroubleshooting

........

Verify A8 DisplayVoltages

.........

Test Point Voltages

................

InCase of Difficulty

...............

DIGITALCONTROL

........................

Introduction 1

.........................

Start Here 1

.................

Abus Test Failure 1

Fatal Errors

......................

HP-IB Failures

....................

PreliminaryChecks (All Models)

.......

HP 8719A/208 A9 CPU Check

.........

HP 8720A A9 CPU Check

............

Display Check (All Models)

............

FrontPanelControlCheck (All Models)

Table of Contents

HP 8719

and

HP 8720

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DIGITALCONTROL

(cont'd)

..................

DiagnosticChecks 4

Fatal ErrorTroubleshooting

............

DisplayTroubleshooting (All Models)

....

HP 8719A/20B DisplayTroubleshooting

MeasureDisplay Power Supply

.............

Voltages EnteringA19 6

Display Power Supply Troubleshooting 7

...............

Run Display Test 52 7

InspectRibbonCable and

............

Repeat DisplayTest 52 7

........

PerformWalkingOne Pattern 8

........

Run Remaining DisplayTests 8

HP 8720A DisplayTroubleshooting

......

.......

Check Display Power Supplies 9

.........

Check Display Test Pattern 11

...

Check Display Intensityand Focus 11

........

Identifythe Faulty Assembly 14

HP-IB Troubleshooting

..............

A1/A2 Front PanelTroubleshooting

....

............

No FrontPanel Control 14

.......................

StuckKey 15

SOURCE

Start Here

..........................

Phase Lock Error Message Displayed

....

Source Troubleshooting Flowchart 2

Power Not Within Specifications

......

BroadbandPhase Lock Problems

.......

...

Check A7 ALC by DisconnectingW2 4

Swap Samplers to Check

..................

A64 R Sampler 4

Check Open Loop Power

............

..............

Check A12 Reference 5

.............

Check A14 Fractional-N 5

A14 VCO RangeCheck with

....................

Oscilloscope 6

................

A14 VCO Exercise 7

A14 Divide-by-N CircuitCheck

........

A14-to-A13 DigitalControl

...................

Signals Check 8

A52 PulseGenerator Check

..........

All Phase LockCheck

..............

Band-RelatedProblems

..............

...............

Check AllYO Drivers 11

BroadbandPower Problems

..........

A7 ALCISignal Separation Check

....

.........

A69 Step Attenuator Check 13

..........

A67 Power SplitterCheck 14

A58 Modulatorand A70 3 dB

...............

Attenuator Check 14

A51 InterfacePower Supplies

.........

Measuring Lower Box BiasVoltages

RECEIVER

Introduction

.........................

Start Here

..........................

.............

All Signal Paths Look Bad 2

.....................

2nd LO Check 2

.....................

4 MHz Check 2

...

At LeastOne Signal Path LooksGood 2

DirectionalCoupler Check

...........

A and B Sampler Check by Substitution 4

SamplerVoltage Check

.............

2nd Converter Check

...............

ACCESSORIES

.........................

Introduction 1

..........................

Start Here 1

Inspectand Gage Connectors

..........

..................

Switch Repeatability 2

InspectErrorTerms

..................

Isolatethe Fault in the RF Path

.......

........................

Cable Test 5

Verify Shorts and Opens

............

SERVICE KEY MENUS

.........................

Introduction 1

..........

InternalDiagnostics Summary 1

..........................

Tests Menu 2

...................

Test Options Menu

Self DiagnoseSoftkey

................

....................

Test Descriptions 4

InternalTests

.....................

ExternalTests 6

.....................

Sys Ver Tests 6

..................

Adjustment Tests 7

........

DisplayTests (HP 8719A120B) 7

.....................

Test Patterns 8

..............

Service ModesSummary 9

................

Service Modes Menu 10

...........

Service Modes More Menu 11

....................

SRC Tune Menu 11

.................

ALC On Off Softkey 12

PeekIPoke Menu

...................

8719

and

8720

Table of Contents

iii

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SERVICE KEY MENUS

(cont'd)

FirmwareRevision Softkey

...........

InputPorts Menu

..................

Analog Bus Menu

..................

Descriptionof the Analog Bus

........

The MainADC

...................

The FrequencyCounter

...........

Notes

..........................

Analog Bus Nodes

.................

A10 Digital IF

....................

All Phase Lock

..................

A12 Reference

...................

A14 Fractional-N(Digital)

...........

HP-IB Service Mnemonic Definitions

...

InvokingTests Remotely

...........

SymbolConventions

..............

Analog Bus Codes

................

ROM/RAMTests

...................

ERROR TERMS

Introduction

........................

MeasurementCalibration Procedure

....

ErrorTerm Inspection

................

Hardcopy Procedure

...............

ErrorTerm Descriptions

..............

Directivity (EDF and EDR)

...........

Source Match(ESF and ESR)

........

...

ReflectionTracking (ERF and ERR) 7

...

Isolation(Crosstalk. EXF and EXR) 8

Load Match (ELF and ELR)

..........

Transmission Tracking (ETFand ETR) 10

THEORY OF OPERATION

Introduction

........................

SystemOperation

...................

FunctionalGroupsof the Analyzer

......

................

Power Supply Theory

A15 Preregulator

..................

A8 Post-Regulator

.................

DigitalControlTheory

................

A1 FrontPanel

....................

Front Panel Processor

...........

A9 CPU

.........................

HP 8719A/20B Display

.............

A18 Display

......................

A16 Rear Panel

...................

A51 Interface

.....................

................

Source Group Theory 9

Source Pretune

................

A14/A13 Fractional-N

Synthesizer

....................

A52 Pulse Generator: the

HarmonicComb

...............

A64 R Sampler: Down-Converting

...................

the Signals 10

All Phase Lock: Comparing Phase

................

andFrequency 10

.........

6 Tuning the YIG Oscillator 11

...........

7 Phase LockedSweep 11

A12 Reference:the Crystal

...........

Reference Frequencies 11

Source Block: The YIG Oscillator

.......................

Signals 12

A7 ALC: Automatic LevelingControl

..................

Signal Separation 15

...

A67 Power Splitter. A68 Attenuator 15

..............

A69 Step Attenuator 15

...............

S4 Transfer Switch 16

....

A56 Lower Front PanelAssembly 16

........

A60 and A61 DC BiasTees 16

....

A62 and A63 DirectionalCouplers 16

...................

Receiver Theory 17

....

Samplers and Second Converters 17

....................

A10 Digital IF 18

REPLACEABLEPARTS

........................

Introduction 1

............

ReplaceableParts Figures

..........

Adjustments and Verification 1

(R-E) Rebuilt-Exchange

.............

Assemblies Cost Less 1

...............

ReplaceableParts List 2

................

OrderingInformation 2

...

..........

Howto Order Parts Fast! 2

REPLACEMENTPROCEDURES

........................

Introduction 1

....

Adjustments and PerformanceTests 1

.....................

Cover Removal 1

Al/A2 Front Panel and Rotary Pulse

............

Generator Replacement 3

...................

Tools Required 3

.......................

Procedure 3

..................

To Disassemble 3

To Removethe Rotary Pulse

.................

Generator(RPG) 3

...................

To Reassemble 3

.............

A18 Display Replacement 5

...................

Tools Required 5

Procedure

.......................

..................

To Disassemble 5

...................

To Reassemble 6

A16 Rear Panel and A15

Pregegulator Replacement

..........

...................

Tools Required 8

Table of Contents

8719 and

8720

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REPLACEMENT PROCEDURES

(cont'd)

.......................

Procedure

..................

To Disassemble

To Removethe

A16

Rear Panel

.......................

Assembly

........

To Removethe Preregulator

...................

To Reassemble

....

A64/A65/A66

Sampler Replacement

...................

Tools Required

.......................

Procedure

..................

To Disassemble

......

To Removethe

or B Sampler

..........

To Removethe R Sampler

...................

To Reassemble

J1/J2

Test PortConnectors.

A62/A63

DirectionalCouplers.

and

A56

~ower'FrontPanel

.....................

Replacement

...................

Tools Required

.......................

Procedure

To Removethe Test Port Connectors

..........

and DirectionalCouplers

...

To Removethe FrontPanel Board

.......

............

To Reassemble

A60/A61

BiasTees and

Transfer

..............

Switch Replacement

..................

Tools Required

..........

To Removethe BiasTees

.....

To Removethe Transfer Switch

..................

To Reassemble

.....

A69

StepAttenuator Replacement

...........................

Tools

.......................

Procedure

..................

To Disassemble

To Reassemble

...................

...........

A51

Interface Replacement

...................

Tools Required

.......................

Procedure

..................

To Disassemble

...................

To Reassemble

A53

Mixer/AmplifierReplacement

......27

...................

Tools Required

.......................

Procedure

..................

To Disassemble

...................

To Reassemble

...

A55

YIG

1/A54

YIG

Replacement

...................

Tools Required

.......................

Procedure

To Disassemble

..................

...................

To Reassemble

S1/S2/S3

MicrowaveSwitch

.....................

Replacement

...................

Tools Required

Procedure

.......................30

To Disassemble

..................

To Reassemble

...................

POST-REPAIRPROCEDURES

.........................

Introduction

RelatedService Procedures

...........

INSTRUMENT HISTORY

.........................

Introduction

INDEX

8719

and HP

8720

Table

Contents

v/vi

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