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Service Guide

8590 Series Analyzers

Assembly-Level Repair

Manufacturing Part Number: 08590-90316

Supersedes: 08590-90300

Printed in USA

April 2001

The information contained in this document is subject to change without notice.

Agilent Technologies makes no warranty of any kind with regard to this material, including but not limited to, the implied warranties of merchantability and ﬁtness for a particular purpose. Agilent Technologies shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing, performance, or use of this material.

Certiﬁcation

Agilent Technologiescertiﬁesthat this product met its published speciﬁcations at the time of shipment from the factory.Agilent Technologies further certiﬁes that its calibration measurements are traceable to the United States National Institute of Standards and Technology, to the extent allowed by the Institute's calibration facility, and to the calibration facilities of other International Standards Organization members.

Regulatory Information

The speciﬁcations and characteristics chapter in this manual contain regulatory information.

Warranty

This Agilent Technologies instrument product is warranted against defects in material and workmanship for a period of one year from date of shipment. During the warranty period, Agilent Technologies will, at its option, either repair or replace products which prove to be defective.

For warranty service or repair, this product must be returned to a service facility designated by Agilent Technologies. Buyer shall prepay shipping charges to Agilent Technologies and Agilent Technologies shall pay shipping charges to return the product to Buyer. However, Buyer shall pay all shipping charges, duties, and taxes for products returned to Agilent Technologies from another country.

Agilent Technologies warrants that its software and ﬁrmware designated by Agilent Technologies for use with an instrument will execute its programming instructions when properly installed on that instrument. Agilent Technologies does not warrant that the operation of the instrument, or software,orﬁrmware will be uninterrupted or error-free.

Limitation of Warranty

The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by Buyer, Buyer-supplied software or interfacing, unauthorized modiﬁcation or misuse, operation outside of the environmental speciﬁcations for the product, or improper site preparation or maintenance.

NO OTHER WARRANTY IS EXPRESSED OR IMPLIED. AGILENT TECHNOLOGIES SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

Exclusive Remedies

THE REMEDIES PROVIDED HEREIN ARE BUYER'S SOLE AND EXCLUSIVE REMEDIES. AGILENT TECHNOLOGIES SHALL NOT BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WHETHER BASED ON CONTRACT, TORT, OR ANY OTHER LEGAL THEORY.

Assistance

Product maintenance agreements and other customer assistance agreements are available for Agilent Technologies products.

For any assistance, contact your nearest Agilent Technologies Sales and Service Ofﬁce.

8590 E-Series and L-Series Spectrum Analyzer Documentation Description

The following guides are shipped with your 8590 E-Series or L-Series spectrum analyzer.

8590 E-Series Spectrum Analyzers and 8591C Cable TV Analyzer Calibration Guide

• Tells you how to test your analyzer to determine if the analyzer meets its speciﬁcations.

8590 E-Series and L-Series Spectrum Analyzers User’s Guide

• Tells you how to make measurements with your analyzer.

• Describes the analyzer features.

• Tells you what to do in case of a failure.

8590 E-Series and L-Series Spectrum Analyzers Quick Reference Guide

• Describes how to make a simple measurement with your analyzer.

• Brieﬂy describes the analyzer functions.

• Lists all the programming commands.

8591C Cable TV Analyzer Documentation Description

The following guides are shipped with your cable TV analyzer.

8590 E-Series Spectrum Analyzers and 8591C Cable TV Analyzer Calibration Guide

• Tells you how to test your analyzer to determine if the analyzer meets its speciﬁcations.

8591C Cable TV Analyzer User’s Guides

Cable TV Measurements

• Tells you how to make cable TV measurements with your analyzer.

• Describes the cable TV analyzer mode features.

Spectrum Analyzer Reference

• Tells you how to make measurements using the spectrum analyzer

mode.

• Describes the spectrum analyzer mode features.

• Tells you what to do in case of a failure.

8591C Cable TV Analyzer Getting Started and Quick Reference Guide

• Describes how to make a simple measurement with your analyzer.

• Brieﬂy describes the cable TV and spectrum analyzer functions.

• Provides a quick reference for cable TV and spectrum analyzer

softkeys.

8590 E-Series and L-Series Spectrum Analyzers, and 8591C Cable TV Analyzer Programmer’s Guide

• Describes analyzer operation via a remote controller (computer) for

Parallel/RS-232 or Parallel/GPIB interface. This manual is provided when ordering either Option 041, Option 043, or 8591C.

8594Q QAM Analyzer Documentation Description

The following guides are shipped with your QAM analyzer.

8590 Series Analyzers Calibration Guide

• Tells you how to test your analyzer to determine if the analyzer meets its speciﬁcations.

8594Q QAM Analyzer User's Guides

Option 190/195 DVB-C/Data Measurements

• Tells you how to make QAM measurements with your analyzer.

• Describes the QAM analyzer mode features.

Spectrum Analyzer Reference

• Tells you how to make measurements using the spectrum analyzer

mode.

• Describes the spectrum analyzer mode features.

• Tells you what to do in case of a failure.

8594Q Option 190/195 DVB-C/Data Measurement QAM Analyzer Getting Started and Quick Reference Guide

• Provides a quick reference for QAM and spectrum analyzer softkeys.

Documentation Options

Option 041 or 043: Programmer's Guide

8590 E-Series and L-Series Spectrum Analyzers, and 8591C Cable TV Analyzer Programmer's Guide

• Describes analyzer operation via a remote controller (computer) for Parallel/RS-232 or Parallel/GPIB interface.

Option 910: Additional User's Documentation

Provides an additional copy of the user's guides, the calibration guide, and the quick reference guide.

Option 915: Service Guide and Component-Level Information

Describes troubleshooting and repair of the analyzer. Option 915 consists of two manuals:

8590 Series Analyzers Assembly-Level Repair Service Guide

• Describes adjustment and assembly level repair of the analyzer.

8590 Series Analyzers Component-Level Repair Service Guide

• Provides information for component-level repair of the analyzer.

How to Order Guides

Each of the guides listed above can be ordered individually. To order, contact your local Sales and Service Ofﬁce.

How to Use This Guide

This guide uses the following conventions.

Front-Panel Key This represents a key physically located on the instrument

front panel.

Softkey This indicates a “softkey,” a key whose label is determined by

the instrument's ﬁrmware. Softkeys are located on the display bezel.

Screen Text This indicates text displayed on the instrument screen.

Contents

1. Introduction

The 8590 Series Analyzers Assembly-Level Repair Service Guide. . . . . . . . . . . . . . . . . . . . . 14

Service Guide Organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Analyzer Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Firmware Revision Date . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

Firmware Upgrade Kit Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Reliability Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Adjustment Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Test Equipment You Will Need . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

When A 3335A Source Is Not Available . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

If There Are Abnormal Indications During Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Periodically Verifying Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Standard-Value Replacement Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

If You Replace or Repair an Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

2. Making Adjustments

Before You Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

1a. Display (with four access holes in top of shield) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

1b. Display (with eight access holes in top of shield) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

2. Sampler Match . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

3. 10 MHz Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

4. 10 MHz Precision Frequency Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

5. Crystal and LC Bandwidth Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

6. Cal Attenuator Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

7. Log and Linear Ampliﬁer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63

8. CAL FREQ Adjustment Routine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

9. CAL AMPTD Adjustment Routine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

10. CAL YTF Adjustment Routine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

11. CAL MXR Adjustment Routine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

12. Second Converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

13. Third Converter and Second IF Bandpass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

14. Comb Generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

15. Frequency Response of the 8590L, 8591C, and 8591E . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

16. Frequency Response of the 8592L/94L, 8593E/94E/95E/96E, and 8594Q . . . . . . . . . . . 106

17. Time and Date . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124

18. Modulator Offset and Gain for Option 010 or 011 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

19. Entering External ALC Correction Constants for Option 010 or 011 . . . . . . . . . . . . . . 129

20. Checking the External ALC for Option 010 or 011 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131

21. Correcting for External ALC Error for Option 010 or 011 . . . . . . . . . . . . . . . . . . . . . . . 135

22. First LO Distribution Ampliﬁer for Option 009 or 010 . . . . . . . . . . . . . . . . . . . . . . . . . . 139

23. BITG Power Level for Option 010 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142

24. Tracking Oscillator for Option 010 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145

25. Checking the Absolute Amplitude Accuracy for Option 050 . . . . . . . . . . . . . . . . . . . . . . 151

26. Correcting for Absolute Amplitude Accuracy for Option 050 . . . . . . . . . . . . . . . . . . . . . 157

27. Checking the Absolute Amplitude Accuracy for Option 051 . . . . . . . . . . . . . . . . . . . . . . 160

28. Correcting for Absolute Amplitude Accuracy for Option 051 . . . . . . . . . . . . . . . . . . . . . 171

Contents

2a. Making Adjustments: If 3335A Source Not Available

Before You Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .178

6a. Cal Attenuator Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .179

7a. Log and Linear Ampliﬁer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .186

15a. Frequency Response of the 8590L, 8591C, and 8591E . . . . . . . . . . . . . . . . . . . . . . . . . .191

3. Backing Up and Reloading Correction Constants

Before You Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .200

Backing Up Analyzer Correction Constants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .201

Analyzer Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .204

Reloading the Correction Constants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .207

Instrument Calibration after Reloading the Correction Constants . . . . . . . . . . . . . . . . . . . .209

4. Troubleshooting the Analyzer

Before You Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .216

Problems at Instrument Power-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .219

Troubleshooting an Inoperative Analyzer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .221

Troubleshooting the A2 Display Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .227

Isolating an RF, LO, IF, or Video Problem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .232

Using the Internal Service-Diagnostic Routines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .238

Troubleshooting the A16 Processor/Video Board Assembly . . . . . . . . . . . . . . . . . . . . . . . . . .249

5. Troubleshooting the IF Section

Before You Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .254

Service Equipment You Will Need . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .254

After an Analyzer Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .255

IF Section Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .255

IF Power-Level Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .256

Troubleshooting the A15 Motherboard Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .266

6. Troubleshooting the RF Section

Before You Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .282

Service Equipment You Will Need . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .283

After an Analyzer Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .283

6a. 8590L, 8591C, and 8591E . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .284

6b. 8592L/94L, 8594Q, and 8593E/94E/95E/96E . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .287

7. Replacing Major Assemblies

Before You Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .294

Service Equipment You Will Need . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .294

After an Analyzer Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .295

Removal and Replacement Procedures in this Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . .295

Instrument Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .296

A1 Front-Frame Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .298

A1A1 Keyboard/Front-Panel Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .302

A2 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .303

RF Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .308

A3 Front-End Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .311

Contents

A7 Analog Interface Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 318

A8 Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 322

A15 Motherboard and IF Extrusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 324

A16 Processor/Video Board and A16A1 Memory Board Assembly . . . . . . . . . . . . . . . . . . . . 330

A16 Processor/Video Board Firmware ROMs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 335

A16A1BT1 Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 337

A17 Memory Card Reader Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 339

A25 Counter-Lock Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 342

B1 Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 344

Rear-Frame Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 346

8. If You Have A Problem

Contacting Agilent Technologies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 350

Check the Basics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 351

Calling Agilent Technologies Sales and Service Ofﬁces . . . . . . . . . . . . . . . . . . . . . . . . . . . . 352

Returning Your Analyzer for Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 355

9. Assembly Descriptions and Block Diagrams

Assembly Descriptions and Block Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 358

RF and LO Section for 8590L, 8591E, and 8591C Spectrum Analyzers . . . . . . . . . . . . . . . 359

RF and LO Section for 8592L, 8593E, 8594E, 8594L, 8594Q,

8595E, and 8596E Analyzers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 365

IF Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 373

10. Analyzer Options and Block Diagrams

Analyzer Options and Block Diagrams. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 394

Option Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 397

Troubleshooting Analyzer Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 408

Tracking Generator 8593E, 8594E, 8595E, 8596E Option 010 . . . . . . . . . . . . . . . . . . . . . . 410

First LO Distribution Ampliﬁer (LODA) 8593E, 8594E, 8594Q, 8595E, 8596E

Option 009 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 419

Option 190 DVB-C Connection Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 433

Option 190 DVB-C Service Menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 434

11. Major Assembly and Cable Locations

Major Assembly and Cable Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 454

12. Replaceable Parts

Replaceable Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 486

Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 487

Standard-Value Replacement Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 497

Component-Level Information Packets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 521

13. Softkey Descriptions

Softkey Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 554

Contents

14. Analyzer Messages

Interpreting Analyzer Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .614

15. Service Equipment and Tools

Service Equipment and Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .660

16. Safety and Regulatory Information

Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .668

Safety Symbols. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .668

Instrument Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .669

General Safety Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .670

Protection from Electrostatic Discharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .672

1 Introduction

The 8590 Series Analyzers Assembly-Level Repair Service Guide provides the information needed to adjust and repair the 8590 E-Series and L-Series spectrum analyzers, the 8591C cable TV analyzer and 8594Q QAM analyzer to the assembly level.

Introduction

The 8590 Series Analyzers Assembly-Level Repair Service Guide

The 8590 Series Analyzers Component-Level Repair Service Guide provides component-level information for the repair of individual analyzer assemblies. The binder contains Component-Level Information Packets (CLIPs) for selected assemblies. Each CLIP contains component-level schematics, a component parts list, and illustrations for component location by reference designator.Each CLIP has its own part number which is changed whenever the part number for its related analyzer assembly is changed. A list of all CLIP part numbers for the 8590 E-Series and L-Series spectrum analyzers, 8591C cable TV analyzers, and 8594Q QAM analyzers is provided in Chapter

12 of this service guide.

Figure 1-1 8590 E-Series and L-Series Spectrum Analyzers, 8591C Cable TV

Analyzers, and 8594Q QAM Analyzer

14 Chapter1

Introduction

Service Guide Organization

The guide is divided into the following chapters.

• Chapter 1, “Introduction,” contains information on the analyzer identiﬁcation, ﬁrmware revisions and upgrades, and safety and reliability considerations.

• Chapter 2, “Making Adjustments,” contains the adjustment procedures needed to adjust the analyzer to meet its speciﬁcations.

• Chapter 2a, “Making Adjustments: 3335A Source Not Available,” contains the adjustment procedures needed to adjust the analyzer to meet its speciﬁcations when a 3335A source is not available.

• Chapter 3, “Backing Up and Reloading Correction Constants,” contains information for safe-guarding the correction data stored in the analyzer and restoring the analyzer memory.

• Chapter 4, “Troubleshooting the Analyzer,”contains information for starting to troubleshoot a analyzer failure.

• Chapter 5, “Troubleshooting the IF Section,” contains speciﬁc troubleshooting information for selected assemblies in the IF section and the A15 Motherland assembly.

• Chapter 6, “Troubleshooting the RF Section,” contains troubleshooting information for the RF and LO sections of the 8590 E-Series and L-Series spectrum analyzer and 8591C cable TV analyzer. The information is separated by the following tabs.

• Chapter 6a, “8590L, 8591C and 8591E,” contains speciﬁc troubleshooting information for selected assemblies within the RF and LO sections of the 8590L, 8591E spectrum analyzers, and 8591C cable TV analyzers.

• Chapter 6b, “8592L/94L, 8594Q, and 8593E/94E/95E/96E,” contains speciﬁc troubleshooting information for selected assemblies within the RF and LO sections of the 8592L, 8594L, 8593E, 8594E, 8595E, 8596E spectrum analyzers, and the 8594Q QAM analyzer.

• Chapter 7, “Replacing Major Assemblies,” contains instructions for the removal and replacement of most major assemblies.

• Chapter 8, “Contacting Agilent Technologies,” contains information on how to contact Agilent Technologies and return the analyzer for repair.

• Chapter 9, “Assembly Descriptions and Block Diagrams,” contains information and block diagrams describing analyzer operation and individual assemblies.

Chapter 1 15

Introduction

Analyzer Description

• Chapter 10, “Analyzer Options and Block Diagrams,” contains information on the available analyzer options.

• Chapter 11, “Major Assembly and Cable Locations,” contains ﬁgures identifying all major assemblies and cables.

• Chapter 12, “Replaceable Parts,” contains information needed to order assemblies and component-level information for the analyzer.

• Chapter 13, “Softkey Descriptions,” contains a description of the calibration, service, and diagnostic softkeys.

• Chapter 14, “Analyzer Messages,” contains a description of the analyzer messages that are displayed when there is a problem with the analyzer.

• Chapter 15, “Service Equipment and Tools,” contains information about equipment and tools used to service the analyzer.

Analyzer Description

The 8590 E-Series and L-Series spectrum analyzers, 8591C cable TV analyzers, and 8594Q QAM analyzers provide measurement capabilities over the RF and Microwave frequency ranges.

The frequency ranges of 8590 E-Series and L-Series spectrum analyzers, 8591C cable TV analyzers, and 8594Q QAM analyzers are described below.

All 8590 E-Series spectrum analyzers, 8591C cable TV analyzers and 8594Q QAM analyzers are equipped with a memory card reader. The memory card reader allows the analyzer to use downloadable software programs. The functional “personality” of the analyzer can also be altered using the memory card reader. This feature provides the user with one analyzer that can perform the function of other types of microwave test equipment.

Further information about the 8590 E-Series and L-Series spectrum analyzers, and the available options, is provided in Chapter 10,

“Analyzer Options and Block Diagrams,” of this service guide and

the 8590 E-Series and L-Series Spectrum Analyzers User's Guide. Further information about the 8591C cable TV analyzer and 8594Q QAM analyzer is provided in the spectrum analyzer reference for your instrument. Further information about the 8594Q QAM analyzer is provided in 8594Q QAM Analyzer Spectrum Analyzer Reference User's Guide.

16 Chapter1

Introduction

Analyzer Description

Table 1-1 8590 E-Series and L-Series Spectrum Analyzer, 8591C Cable TV

Analyzer and 8594Q QAM Analyzer Frequency Ranges

Analyzer Model Frequency Range

8590L 9 kHz to 1.8 GHz 8591E 9 kHz to 1.8 GHz 8591C 1 MHz to 1.8 GHz 8592L 9 kHz to 22.0 GHz

8592L (Option 026) 9 kHz to 26.5 GHz

8593E 9 kHz to 22.0 GHz

8593E (Option 026) 9 kHz to 26.5 GHz

8594E 9 kHz to 2.9 GHz 8594L 9 kHz to 2.9 GHz 8594Q 9 kHz to 2.9 GHz 8595E 9 kHz to 6.5 GHz 8596E 9 kHz to 12.8 GHz

Chapter 1 17

Introduction

Firmware Revision Date

When the analyzer is ﬁrst turned on, a display appears that contains the copyright date and ﬁrmware revision date. (If the analyzer has either Option 041, IB and parallel I/O, or Option 043, RS-232 and parallel I/O, the display will also contain the entries shown on the ﬁrst line of the example below.)

The version of ﬁrmware installed in the analyzer is identiﬁed by the year, month, and day in the following format.

Whenever you contact Agilent Technologies about your analyzer, be sure to provide the ﬁrmware date along with the complete serial number and option designation. This will ensure that you obtain accurate service information.

Firmware Upgrade Kit Ordering Information

There are occasions when the factory revises the analyzer ﬁrmware to correct defects or make performance improvements. When a ﬁrmware revision is needed, a service note is distributed by the factory to all Agilent Technologies service centers. The service note identiﬁes, by serial-number preﬁx, the analyzers that require the latest ﬁrmware upgrade kit.

If your analyzer requires a ﬁrmware upgrade kit, it can be obtained by ordering as described in Chapter 12, “Replaceable Parts.”Instructions for the replacement of the ﬁrmware ROMs is located under “A16 Processor/Video Board Firmware ROM” in Chapter 7, “Replacing Major

Assemblies,” of this guide.

18 Chapter1

Introduction

Reliability Considerations

Analyzer Input Protection

The analyzer input circuitry can be damaged by power levels that exceed the maximum safe input-level speciﬁcations. Table 1-2 through

Table 1-5 provides the input speciﬁcations. To prevent input damage,

these speciﬁed levels for your analyzer must not be exceeded. The analyzer input can also be damaged by large transients. If it is

likely that your analyzer will be exposed to potentially damaging transients, take whatever precautions are necessary to protect its input circuitry.

The analyzer input can easily be protected by disconnecting it from the signal source whenever it is likely that large transients will be present. When it is impractical to disconnect the analyzer, a transient-limiting device should be used.

The 11947A Transient Limiter is an analyzer accessory that protects the input circuitry from transients and accidental overloads. Contact your local Agilent Technologies sales or service ofﬁce for more information about the 11947A.

CAUTION Transients are often produced during electromagnetic interference

(EMI) conducted emissions testing. One type of device, the line impedance stabilization network (LISN), can produce large transients when its switch position or voltage input is changed.

Chapter 1 19

Introduction

Reliability Considerations

Table 1-2 8590L and 8591E Spectrum Analyzer and 8591C Cable TV

Analyzer &Maximum Safe Input Level

INPUT 50Ω (Input

Attenuation ≥10 dB)

Average Continuous Power Peak Pulse Power

dc 25 Vdc 100 Vdc

+30 dBm (1 W) +30 dBm (1 W)

INPUT 75Ω (Input

Attenuation ≥10 dB)

+75 dBmV (0.4 W) +75 dBmV (0.4 W)

Table 1-3 8592L and 8593E Spectrum Analyzer Maximum Safe Input

Level

INPUT 50Ω (Input Attenuation

≥10 dB bands 1 through 4)

Average Continuous Power Peak Pulse Power

dc 0 Vdc

+30 dBm (1 W, 7.1 V rms), input attenuation ≥10 dB

+50 dBm (100 W) for <10 µs pulse width and <1% duty cycle, ssfs input attenuation ≥30 dB

Table 1-4 8594E and 8594L Spectrum Analyzer and 8594Q Analyzer

Maximum Safe Input Level

INPUT 50Ω (Input Attenuation ≥10 dB)

Average Continuous Power Peak Pulse Power

dc 0 V (dc coupled)

+30 dBm (1 W, 7.1 V rms) +50 dBm (100 W) for <10 µs pulse width and

<1% duty cycle, input attenuation ≥30 dB

50 V (ac coupled)

Table 1-5 8595E and 8596E Spectrum Analyzer Maximum Safe Input

Level

INPUT 50Ω (Input Attenuation ≥10 dB

above 2.75 GHz)

Average Continuous Power Peak Pulse Power

dc 0 V (dc coupled)

+30 dBm (1 W, 7.1 V rms) +50 dBm (100 W) for <10 µs pulse width and

<1% duty cycle, input attenuation ≥30 dB

50 V (ac coupled)

20 Chapter1

Introduction

Adjustment Procedures

The following table lists the analyzer adjustments in Chapter 2 and Chapter 2a and the models that they apply to. Select the model of the analyzer being adjusted and note the adjustments marked in the analyzer model column to determine which adjustments should be performed.

Table 1-6 8590 E-Series and L-Series Spectrum Analyzer, 8591C Cable TV

and 8594Q QAM Analyzer Adjustment Procedures

Adjustment for Spectrum Analyzer Model:

Adjustment Procedure Name

8590L

8591C

1. Display •••••••••

2. Sampler Match •••••••••

3. 10 MHz Reference •••••••••

4. 10 MHz Precision Frequency Reference

5. Crystal and LC Bandwidth Filter •••••••••

6a.

7a.

8. CAL FREQ Adjustment Routine •••••••••

9. CAL AMPTD Adjustment Routine •••••••••

10. CAL YTF Adjustment Routine • • •

11. CAL MXR Adjustment Routine • • •

Cal Attenuator Error Cal Attenuator Error Log and Linear Ampliﬁer Log and Linear Ampliﬁer

•• •• ••

•••••••••

8591E

8592L

8593E

8596E

8594E

8594L

8594Q

8595E

12. Second Converter • • •

13. Third Converter and Second IF Bandpass

14. Comb Generator • •

15. Frequency Response of the 8590L, 8591C, and 8591E

Chapter 1 21

•••••••••

•••

Introduction

Adjustment Procedures

Table 1-6 8590 E-Series and L-Series Spectrum Analyzer, 8591C Cable TV

and 8594Q QAM Analyzer Adjustment Procedures

Adjustment for Spectrum Analyzer Model:

Adjustment Procedure Name

8590L

8591C

15a. Frequency Response of the 8590L,

8591C, and 8591E

16. Frequency Response of the 8592L, 8593E,8594E, 8594L, 8594Q,8595E, 8596E

17. Time and Date •••••••••

18. Modulator Offset and Gain for Option 010 or 011

19. Entering External ALC Correction Constants for Option 010 or 011

20. Checking the External ALC for Option 010 or 011

21. Correcting the External ALC Error for Option 010 or 011

22. First LO Distribution Ampliﬁer for Option 009 or 010

23. BITG Power Level for Option 010 • • •

•••

8592L

8591E

••••••

8593E

8596E

•• •

8594E

8594L

8594Q

8595E

24. Tracking Oscillator for Option 010 • • •

25. Checking the Absolute Amplitude Accuracy for Option 050

26. Correcting for Absolute Amplitude Accuracy for Option 050

27. Checking the Absolute Amplitude Accuracy for Option 051

28. Correcting for Absolute Amplitude Accuracy for Option 051

••• •

••• `•

a. If a 3335A source is not available, use the alternative adjustment with the same

number found in Chapter 2a , “Making Adjustments: If 3335A Source Not Avail-

able.”

b. If a 3335A source is not available, substitute this adjustment for the one with the

same number found in Chapter 2 , “Making Adjustments.”

22 Chapter1

Introduction

Safety

Familiarize yourself with the safety symbols marked on the analyzer, and read the general safety instructions and the symbol deﬁnitions given in Chapter 16 , “Safety and Regulatory Information,” before you begin the procedures in this chapter.

Test Equipment You Will Need

Refer to Chapter 1 of the calibration guide for your instrument for a list of recommended equipment for the analyzer adjustments. Any equipment that meets the critical speciﬁcations given in the table can be substituted for the recommended model.

If a 3335A Synthesizer/Level Generator is not available, see Chapter 1 of the calibration guide for your instrument for alternative recommended test equipment, accessories, and adapters.

When A 3335A Source Is Not Available

The 3335A Synthesizer Level Generator signal source has become obsolete because parts used in the manufacture of this instrument are no longer available from suppliers. To meet the need of our customers, this service guide has been revised to add new adjustments that do not use the 3335A Synthesizer Level Generator. This revision includes the addition of signal sources required to replace the 3335A, changes i to the test equipment setup illustrations, and changes in the steps required to execute the adjustments.

Since all of our customers will not need to replace their 3335A Synthesizer Level Generators immediately, the original adjustments which use the 3335A signal generator have been retained. The revisions have been incorporated in this service guide as Chapter 2a ,

“Making Adjustments: If 3335A Source Not Available.”

Chapter 1 23

Introduction

If There Are Abnormal Indications During Adjustment

If the indications received during an adjustment do not agree with the normal conditions given in the adjustment procedures, a fault exists in your analyzer. The fault should be repaired before proceeding with any further adjustments. Refer to the troubleshooting and repair information in Chapter 4, “Troubleshooting the Analyzer,” of this guide.

Periodically Verifying Calibration

The analyzer requires periodic veriﬁcation of operation. Under most conditions of use, you should test the analyzer at least once a year with either operation veriﬁcation or the complete set of performance veriﬁcation tests located in the calibration guide for your instrument.

When test results show proper operation and calibration, no adjustments are necessary. However, if test results indicate that the instrument does not meet speciﬁcations, the cause should be determined and rectiﬁed. Refer to the troubleshooting information in

Chapter 4, “Troubleshooting the Analyzer,” before attempting

recalibration.

Standard-Value Replacement Components

Part numbers for standard-value replacement components used in the adjustment procedures are located in Chapter 12, “Replaceable Parts,” of this service guide.

24 Chapter1

Introduction

If You Replace or Repair an Assembly

If one or more analyzer assemblies has been replaced or repaired, related adjustment procedures should be done prior to verifying operation. Refer to Table 1-7 to determine which adjustment to perform after replacing or repairing an assembly. Find the assembly that has been repaired or replaced in the left-hand column. Then perform the adjustments marked across the adjustment column for that assembly. It is important that adjustments are performed in the order indicated to ensure that the instrument meets all of its speciﬁcations.

Table 1-7 Adjustments and Tests for Replaced or Repaired Assemblies

Replaced or Repaired Assembly

A1 Front Frame CAL AMPTD Frequency Response

A2 Display Display

A3A1 Comb Generator Comb Generator

A3A2 Microwave Switch

A3A3 Low-Pass Filter CAL FREQ

A3A4 Second Converter

Related Adjustments and Adjustment Routines

CAL AMPTD

CAL YTF

CAL FREQ CAL AMPTD CAL YTF

CAL AMPTD CAL YTF

CAL FREQ CAL AMPTD CAL YTF

Related PerformanceVeriﬁcationTests

Residual Responses Frequency Response

Residual Responses Comb Generator Frequency Accuracy

Frequency Response Residual Responses

Noise Sidebands System Related Sidebands Frequency Response Other Input Related Spurious Responses Spurious Response Gain Compression Displayed Average Noise Residual Responses

A3A5 Input Attenuator CAL FREQ

CAL AMPTD CAL YTF Frequency Response

Chapter 1 25

Frequency Response Residual Responses

Introduction

If You Replace or Repair an Assembly

Table 1-7 Adjustments and Tests for Replaced or Repaired Assemblies

Replaced or Repaired Assembly

A3A6 Dual Mixer or Low Band Mixer

A3A7 YIG-Tuned Oscillator

A3A8 YIG-Tuned Filter or A3A8 Switched YIG-Tuned Filter

Related Adjustments and Adjustment Routines

CAL FREQ CAL AMPTD CAL YTF CAL MXR Frequency Response

First LO Distribution Ampliﬁer for Option 009 or 010

CAL FREQ CAL AMPTD CAL YTF

CAL FREQ CAL AMPTD CAL YTF CAL MXR Frequency Response

Related PerformanceVeriﬁcationTests

Noise Sidebands System Related Sidebands Frequency Response Other Input Related Spurious Responses Spurious Response Gain Compression Displayed Average Noise Residual Responses

Frequency Readout & Marker Count Accy Noise Sidebands System Related Sidebands Residual FM Frequency Span Readout Accy Frequency Response Other Input Related Spurious Responses Spurious Response Residual Responses

Noise Sidebands System Related Sidebands Frequency Response Other Input Related Spurious Responses Spurious Response Displayed Average Noise Residual Responses

A3A9 Bandpass Filter CAL FREQ

CAL AMPTD

A3A10 Directional Coupler

A3A11 Step-Recovery Diode

A3A12 3 dB Attenuator CAL FREQ

A3A13 Isolator CAL FREQ

CAL FREQ CAL AMPTD CAL YTF

CAL FREQ CAL AMPTD

CAL AMPTD

CAL AMPTD CAL YTF

None

System Related Sidebands Frequency Response Other Input Related Spurious Responses Spurious Responses Residual Responses

Comb Generator Frequency Accuracy

None

System Related Sidebands Frequency Response Other Input Related Spurious Responses Spurious Responses Residual Responses

26 Chapter1

Introduction

If You Replace or Repair an Assembly

Table 1-7 Adjustments and Tests for Replaced or Repaired Assemblies

Replaced or Repaired Assembly

A3A14 LO Distribution Ampliﬁer (LODA)

A3A15 Tracking Generator

A3 Input Attenuator CAL FREQ

Related Adjustments and Adjustment Routines

First LO Distribution Ampliﬁer for Option 009 or 010 only

CAL FREQ CAL AMPTD CAL YTF

First LO Distribution Ampliﬁer for Option 009 or 010

CAL FREQ CAL AMPTD CAL YTF BITG Power Level for Option 010

CAL AMPTD

Related PerformanceVeriﬁcationTests

Frequency Readout and Marker Count Accy Noise Sidebands System Related Sidebands Residual FM Frequency Span Readout Accuracy Frequency Response Other Input Related Spurious Responses Spurious Response Residual Responses

Frequency Response

A4 First Converter Frequency Response

CAL FREQ CAL AMPTD

A5 Second Converter Second Converter

CAL FREQ CAL AMPTD

A6 YIG-Tuned Oscillator

CAL FREQ CAL AMPTD

Noise Sidebands System Related Sidebands Frequency Response Spurious Response Gain Compression Displayed Average Noise Residual Responses

Noise Sidebands Residual FM System Related Sidebands Frequency Response Spurious Response Gain Compression Displayed Average Noise Residual Responses

Noise Sidebands Residual FM System Related Sidebands Frequency Span Readout Accuracy Frequency Response Spurious Response Displayed Average Noise Residual Responses

Chapter 1 27

Introduction

If You Replace or Repair an Assembly

Table 1-7 Adjustments and Tests for Replaced or Repaired Assemblies

Replaced or Repaired Assembly

A7 Analog Interface CAL FREQ

A7A1 Tracking Generator Control

Related Adjustments and Adjustment Routines

CAL AMPTD CAL YTF (8592L, 8593E, 8595E, 8596E only)

Modulator Offset and Gain for Option 010 or 011 Entering External ALC Correction Constants for Option 010 or 011 Checking the External ALC for Option 010 or 011 Correcting the External ALC Error for Option 010 or 011

Related PerformanceVeriﬁcationTests

Frequency Readout and Marker Count Accy Noise Sidebands Residual FM System Related Sidebands Frequency Span Readout Accuracy Sweeptime Accuracy Scale Fidelity Reference Level Accuracy Absolute Amplitude Calibration and Resolution Bandwidth Switching Uncertainties Frequency Response

Absolute Amplitude, Vernier, and Power Sweep Accuracy Tracking Generator Level Flatness Harmonic Spurious Outputs Non-Harmonic Spurious Outputs Tracking Generator Feedthrough

A8 Power Supply None System Related Sidebands

Spurious Responses Residual Responses

A9 Third Converter Third Converter

&Second IF Bandpass CAL FREQ CAL AMPTD BITG Power Level for Option 010 only

A10 LODA Control (Opt. 009) or Tracking Generator Control (Opt. 010)

First LO Distribution Ampliﬁer for Option 009 or 010 only CAL FREQ CAL AMPTD CAL YTF

Noise Sidebands System Related Sidebands Absolute Amplitude Calibration and Resolution Bandwidth Switching Uncertainties Other Input Related Spurious Spurious Responses Displayed Average Noise Residual Responses

Frequency Response Absolute Amplitude, Vernier and Power Sweep Accuracy Tracking Generator Level Flatness

28 Chapter1

Introduction

If You Replace or Repair an Assembly

Table 1-7 Adjustments and Tests for Replaced or Repaired Assemblies

Replaced or Repaired Assembly

A11 Bandwidth Crystal and IC

A12Amplitude Control CAL FREQ

A13 Bandwidth Crystal and IC

A14 Log Ampliﬁer Log and Linear

A15 Motherboard CAL FREQ

A16 Processor/Video A16A1 Memory

Related Adjustments and Adjustment Routines

Bandwidth Filter CAL FREQ CAL AMPTD

CAL AMPTD

Bandwidth Filter CAL FREQ CAL AMPTD

Ampliﬁer CAL FREQ CAL AMPTD

CAL AMPTD 10 MHz Reference

CAL FREQ CAL AMPTD CAL YTF (8592L, 8593E, 8595E, 8596E only) CAL MXR † (8592L, 8593E, 8595E, 8596E only) Cal Attenuator Error † Frequency Response † Time and Date

Related PerformanceVeriﬁcationTests

Resolution Bandwidth Accuracy Absolute Amplitude Calibration and Bandwidth Switching Uncertainties

Scale Fidelity Displayed Average Noise

Resolution Bandwidth Accuracy Absolute Amplitude Calibration and Bandwidth Switching Uncertainties

Scale Fidelity Reference Level Accuracy

Complete Operation Veriﬁcation

Reference Level Accuracy Frequency Response

† These adjustments are not necessary if valid correction constants are recovered from the defective A16 processor/video assembly. See the A16 processor/video board assembly replacement procedure in this service guide.

Chapter 1 29

Introduction

If You Replace or Repair an Assembly

30 Chapter1

2 Making Adjustments

The procedures in this chapter adjust the analyzer electrical performance to the speciﬁcations described in Chapter 2 of the calibration guide for your instrument.

Most adjustments require access to the interior of the analyzer. If a 3335A source is not available, use the alternative adjustments with

the same number found in Chapter 2a.

Making Adjustments

Before You Start

There are three things you should do before starting an adjustment procedure.

• Check that you are familiar with the safety symbols marked on the analyzer, and read the general safety considerations and the symbol deﬁnitions given in the front of this service guide.

• Check that the analyzer has been turned on and allowed to warm up for at least 30 minutes at room temperature before making any adjustments. The analyzer must be allowed to stand at room temperature at least 2 hours prior to the 30 minute warmup.

• Read the rest of this section.

32 Chapter2

Making Adjustments

1a. Display (with four access holes in top of shield)

This adjustment applies to:

All 8590 E-Series and L-Series spectrum analyzers 8591C cable TV analyzers 8594Q QAM analyzers

There are two different types of displays. If your display has four holes in the top of the shield, continue with this procedure. If it has eight holes, go to the next procedure.

The horizontal and vertical display positions are adjusted using front-panel softkeys. These positions are then stored in nonvolatile memory.

There are two focus adjustments, ﬁne and coarse. The ﬁne adjustment is located on the left side of the display assembly and can be accessed with the instrument cover on or off.The coarse adjustment is located on the rear of the display assembly and can only be adjusted with the instrument cover off.

Procedure

Display Position

1. Press the following analyzer keys to adjust the horizontal position.

PRESET CAL, More 1 of 4 CRT HORZ POSITION

2. Rotate the knob until the display is centered horizontally.

3. Press the following analyzer softkey to adjust the vertical position.

CRT VERT POSITION

4. Rotate the knob until the display is centered vertically.

5. Press the following analyzer keys to store the horizontal and vertical position values into nonvolatile memory.

CAL CAL STORE

Chapter 2 33

Making Adjustments

1a. Display (with four access holes in top of shield)

Fine Focus

1. Adjust the front panel INTENSITY control for a comfortable viewing intensity.

2. Use an adjustment tool to access the ﬁne focus adjustment. See

Figure 2-1. Adjust as necessary for a focused display. If one of the

end-stops of the ﬁne focus adjustment is reached, proceed with the “Coarse Focus Adjustment” section.

Figure 2-1 Fine Focus Adjustment Location

34 Chapter2

Making Adjustments

1a. Display (with four access holes in top of shield)

Coarse Focus

The Coarse Focus adjustment point is located at the rear of the display assembly, therefore, it is required to place the display in a service position to perform this procedure.

1. Turn the analyzer

LINE switch to OFF. Remove the instrument cover

assembly.

2. Place the display in a service position.

WARNING The analyzer contains potentially hazardous voltages. Refer to

the safety symbols provided on the analyzer, and in the general safety instructions in this guide, before operating the unit with the cover removed. Ensure that safety instructions are strictly followed. Failure to do so can result in severe or fatal injury.

3. Turn the analyzer

LINE switch to ON.

4. Center the ﬁne focus adjustment. Refer to Figure 2-1 for the adjustment location.

5. Adjust the coarse focus adjustment for the best possible focus. See

Figure 2-2.

Figure 2-2 Coarse Focus Adjustment Location

(rear view of display assembly)

Chapter 2 35

Making Adjustments

1b. Display (with eight access holes in top of shield)

This adjustment applies to:

All 8590 E-Series and L-Series spectrum analyzers 8591C cable TV analyzers 8594Q QAM analyzers

CAUTION All display adjustments are described in this adjustment procedure.

However, the FOCUS adjustment is the only adjustment that can be performed without removing the instrument cover.

For all other adjustments, it is strongly recommended that you return the instrument to your local sales and service ofﬁce.

There are two different types of displays. If your display has eight holes in the top of the shield, continue with this procedure. If it has four holes, go to the preceding procedure.

If you are going to make adjustments to your display, only make the adjustments that would correct the problem that the display is experiencing.

The following is a list of adjustments described in this procedure:

• Focus • Centering

• Horizontal Hold • Vertical Hold

• Vertical Size • Vertical Linearity

• Brightness • Contrast

The horizontal and vertical display positions should ﬁrst be adjusted using front-panel softkeys. These positions are then stored in nonvolatile memory.

The Focus adjustment is located on the left side of the instrument and can be accessed with the instrument cover on or off. All other adjustments must be made with the instrument cover removed.

Equipment Required

Display adjustment tool, 0.075 inch hex (part number 8710-1010)

36 Chapter2

Making Adjustments

1b. Display (with eight access holes in top of shield)

Procedures

Before Performing any Adjustment

Before performing any display adjustment, press the following analyzer keys.

CONFIG, More 1 of 3, More 2 of 3 DEFAULT SYNC

CAL, More 1 of 4, More 2 of 4

DEFAULT CAL DATA

Focus

The Focus potentiometer is located on the left side of the instrument and can be accessed with the instrument cover on or off. Use the speciﬁed adjustment tool to make this adjustment.

1. Adjust the front-panel INTENSITY control for a comfortable viewing intensity.

2. Adjust as necessary for a focused display. See Figure 2-1.

Figure 2-3 Focus Adjustment Location

Chapter 2 37

Making Adjustments

1b. Display (with eight access holes in top of shield)

Centering

Perform this adjustment only if the displayed image is not horizontally centered on the display.

The Centering potentiometer is accessible through the top of the display's cover. The instrument cover must be removed for access to the display's cover. Refer to Figure 2-4 for the location of this adjustment. Use the speciﬁed adjustment tool to make this adjustment.

1. Press

CAL, More 1 of 4, CRT HORZ POSITION.

2. Set the CRT horizontal position setting to 12.

3. Set the Centering potentiometer so the displayed image is positioned approximately at the center of the display.

Figure 2-4 Display Adjustment Locations

38 Chapter2

Making Adjustments

1b. Display (with eight access holes in top of shield)

Horizontal Hold

Perform this adjustment only if the displayed image is rolling horizontally across the display.

The Horizontal Hold potentiometer is accessible through the top of the display's cover. The instrument cover must be removed for access to the display's cover. Refer to Figure 2-4 for the location of this adjustment. Use the speciﬁed adjustment tool to make this adjustment.

1. If the display is unreadable, ﬁrst adjust the Horizontal Hold potentiometer for a stable display.

2. Press

CAL, More 1 of 4, CRT HORZ POSITION.

3. Set the CRT horizontal position setting to 12.

4. Find the clockwise position of the Horizontal Hold potentiometer where the display begins to roll horizontally.

5. Find the counter-clockwise position of the Horizontal Hold potentiometer where the display begins to roll horizontally.

6. Set the adjustment to a position approximately midway between the clockwise and counter clockwise position where the display does not roll horizontally.

Vertical Hold

Perform this adjustment only if the displayed image is rolling vertically on the display.

The Vertical Hold potentiometer is accessible through the top of the display's cover. The instrument cover must be removed for access to the display's cover. Refer to Figure 2-4 for the location of this adjustment. Use the speciﬁed adjustment tool to make this adjustment.

1. If the display is unreadable, ﬁrst adjust the Vertical Hold potentiometer for a stable display.

2. Press

3. Press

CONFIG, More 1 of 3, More 2 of 3. SYNC NRM NTSC (NTSC).

4. Adjust the Vertical Hold potentiometer so that the display image is not rolling vertically.

Chapter 2 39

Making Adjustments

1b. Display (with eight access holes in top of shield)

5. Press SYNC NRM PAL (PAL).

6. Adjust the Vertical Hold potentiometer so that the display image is not rolling vertically.

7. Repeat step 1 to step 5 until no adjustment is necessary for either the NTSC or the PAL mode.

8. Press

DEFAULT SYNC.

This is the third softkey from the top.

Vertical Size

Perform this adjustment only if the displayed image is too tall or too short for the display.

The Vertical Size potentiometer is accessible through the top of the display's cover. The instrument cover must be removed for access to the display's cover. Refer to Figure 2-4 for the location of this adjustment. Use the speciﬁed adjustment tool to make this adjustment.

1. Press

CAL, More 1 of 4, CRT VERT POSITION.

2. Set the CRT vertical position setting so that softkey labels are adjacent to the keys at the right to which they are associated.

3. Adjust the Vertical Size potentiometer so that the uppermost softkey label is adjacent to the uppermost softkey and the lowermost softkey label is adjacent to the lowermost softkey.

4. Repeat step 2 and step 3 if necessary.

Vertical Linearity

Perform this adjustment only if the vertical space between the horizontal graticules are not equal on the display.

The Vertical Linearity potentiometer is accessible through the top of the display's cover. The instrument cover must be removed for access to the display's cover. Refer to Figure 2-4 for the location of this adjustment. Use the speciﬁed adjustment tool to make this adjustment.

1. Adjust the Vertical Linearity potentiometer so that the vertical space between each of horizontal graticules are approximately equal.

40 Chapter2

Making Adjustments

1b. Display (with eight access holes in top of shield)

Brightness and Contrast

Perform these adjustments only if the brightness and contrast of the display is not correct.

The Brightness and Contrast potentiometers are accessible through the top of the display's cover. The instrument cover must be removed for access to the display's cover. Refer to Figure 2-4 for the locations of these adjustments. Use the speciﬁed adjustment tool to make these adjustments.The Brightness and Contrast potentiometers are interactive adjustments.

1. Adjust the Contrast potentiometer to the full clockwise position (the image is no longer displayed).

2. Adjust the front-panel INTEN knob to the full clockwise position.

3. Adjust the Bright potentiometer until the background is just barely extinguished (the background is dark).

4. Adjust the front-panel INTEN knob to the full counter-clockwise position.

5. Adjust the Contrast potentiometer until the image is just barely extinguished.

6. Adjust the front-panel INTEN knob to the full clockwise position and verify there is not background illumination. If necessary, re-adjust brightness and contrast so that the front-panel INTEN will go from a dark screen to a bright screen with a dark background.

7. Adjust the front-panel INTEN knob for comfortable brightness and adjust the display focus.

Chapter 2 41

Making Adjustments

2. Sampler Match

This adjustment applies to:

All 8590 E-Series and L-Series spectrum analyzers 8591C cable TV analyzers 8594Q QAM analyzers

The match between the sampling oscillator and the sampler is optimized by ﬁrst setting the sampling-oscillator frequency for midrange, then adjusting the sampler-match adjustment for maximum dc volts as read on a digital multimeter.

Equipment Required

Digital multimeter DMM test leads

Procedure

1. Turn the analyzer LINE switch to OFF. Remove the instrument over assembly.

2. Turn the analyzer LINE switch to ON.

3. Set the center frequency of the analyzer to 194 MHz. If you are adjusting an 8590L, or 8591E spectrum analyzer, or an 8591C cable TV analyzer, set the center frequency to 265 MHz.

4. Press the following analyzer keys.

SPAN, 10, MHz

5. Connect the digital multimeter (DMM) from chassis ground to A25TP1. Refer to Figure 2-5.

6. Adjust A25C107 for maximum voltage as read on the DMM. This voltage must be −1.5 V ±1.0 V.

7. Measure the voltage at A25TP2. It should be +1.5 V ±1.0 V. If it is not, readjust A25C107 until a compromise is established between the two test points, such that the voltage speciﬁcations of step 6 and

step 7 are met.

42 Chapter2

Figure 2-5 A25 Counter Lock Assembly Test Points

Making Adjustments

2. Sampler Match

Chapter 2 43

Making Adjustments

3. 10 MHz Reference

This adjustment applies to:

All 8590 E-Series and L-Series spectrum analyzers 8591C cable TV analyzers with Option 704 8594Q QAM analyzers with Option 704

The internal 10 MHz time base is adjusted for frequency accuracy. This procedure does not adjust for long-term drift or aging rate. Only short-term accuracy is adjusted.

A frequency counter is connected to the CAL OUT, which is locked to the 10 MHz reference. This yields better effective resolution.

The time base is adjusted for a frequency of 300 MHz as read by the frequency counter.

Equipment Required

Microwave frequency counter Frequency standard Cable, 122 cm (48 in) (two required)

Figure 2-6 10 MHz Reference Adjustment Setup

44 Chapter2

Making Adjustments

3. 10 MHz Reference

Procedure

Note that to properly adjust the time base, a frequency standard with a better time base accuracy than that of the analyzer is required.

1. Connect the equipment as shown in Figure 2-6.

2. Set the microwave frequency counter controls as follows:

50 Ω/1 MΩ...........................................50 ΩImpedance

10 Hz–500 MHz/500 MHz–18 GHz ...10 Hz–500 MHz

SAMPLE RATE .......................................... Midrange

FREQUENCY STANDARD ................... EXTERNAL

3. Press the following analyzer keys.

PRESET FREQUENCY, −2001, Hz CAL, More 1 of 4, More 2 of 4, More 3 of 4 SERVICE CAL, CAL TIMEBASE

4. A number will be displayed in the active function block of the

analyzer display. This is the setting of the DAC (0 to 255) which controls the frequency of the internal time base. Use the knob or keyboard to change the DAC setting until the frequency counter reads 300 MHz ±75 Hz (±0.25 ppm).

5. Once the time base has been adjusted for minimum deviation from

300 MHz, press

CAL, CAL STORE. The new DAC number is now

stored in nonvolatile memory.

Chapter 2 45

Making Adjustments

4. 10 MHz Precision Frequency Reference

This adjustment applies to:

All 8590 E-Series spectrum analyzers, Option 004 8591C cable TV analyzers 8594Q QAM analyzers

Replacement oscillators are factory adjusted after a complete warmup and after the speciﬁed aging rate has been achieved. Readjustment should not be necessary after oscillator replacement, and is not recommended.

Note that the analyzer must be ON continuously for at least 24 hours immediately prior to adjusting the oscillator to allow both the temperature and frequency of the oscillator to stabilize. Failure to allow sufﬁcient stabilization time could result in the misadjustment of the oscillator.

The frequency of the internal 10 MHz frequency reference is compared to a known frequency standard and adjusted for minimum frequency error. This procedure does not adjust the short-term stability or long-term stability of the 10 MHz Ovenized Crystal Oscillator (OCXO), which are determined by characteristics of the particular oscillator and the environmental and warmupconditions to which it has been recently exposed. The analyzer must be ON continuously for at least 24 hours immediately prior to oscillator adjustment to allow both the temperature and frequency of the oscillator to stabilize.

Equipment Required

Frequency standard Frequency counter Cable, BNC, 122 cm (48 in) (two required)

Figure 2-7 Precision Frequency Reference Setup

46 Chapter2

Making Adjustments

4. 10 MHz Precision Frequency Reference

Procedure

1. Place the analyzer on its side as shown in Figure 2-7 and set the

LINE switch of the analyzer to ON.

2. Allow the analyzer to remain powered ON and undisturbed for at

least 24 hours, so that both the temperature and frequency of the OCXO can stabilize.

3. Connect the frequency standard to the frequency counter rear-panel

TIMEBASE IN/OUT connector. Refer to Figure 2-7.

4. Disconnect the jumper between the 10 MHz REF OUTPUT and EXT

REF IN jacks on the analyzer rear panel. Connect a BNC cable between the 10 MHz REF OUTPUT jack and INPUT A on the frequency counter.

5. Set the frequency counter controls as follows:

FUNCTION/DATA ....................................... FREQA

INPUT A:

x10 ATTN ........................................................ OFF

AC ............................................. OFF (DC coupled)

50 Ω Z .................... OFF (1 MΩ input impedance)

AUTO TRIG ........................................................... ON

100 kHz FILTER A .............................................. OFF

INT/EXT switch (rear panel) .............................. EXT

6. On the frequency counter select a 1 second gate time and a 10 MHz

offset of the displayed frequency by pressing the following frequency counter keys.

GATE TIME, 1, GATE TIME MATH, SELECT/ENTER CHS/EEX, 10, CHS/EEX, 6, SELECT/ENTER SELECT/ENTER

The frequency counter should now display the difference between the frequency of the INPUT A signal and 10.0 MHz with a displayed resolution of 10 MHz (0.010 Hz).

7. Locate the FREQ ADJ control on the OCXO. See Figure 2-8. Remove

the dust cap screw.

8. Use a nonconductive adjustment tool to adjust the FREQ ADJ

control on the OCXO for a frequency counter indication of 0.00 Hz.

Chapter 2 47

Making Adjustments

4. 10 MHz Precision Frequency Reference

9. Select a 10 second gate time by pressing the following frequency counter keys.

GATE TIME, 10, GATE TIME

The frequency counter should now display the difference between the frequency of the INPUT A signal and 10.0 MHz with a resolution of 0.001 Hz (1 MHz).

10.Wait at least 2 gate periods for the frequency counter to settle, and then adjust the FREQ ADJ control on the OCXO for a stable frequency counter indication of 0.000 ±0.010 Hz.

11.Replace the dust cap screw on the OCXO.

Figure 2-8 Oven Reference Adjustment Location

48 Chapter2

Making Adjustments

5. Crystal and LC Bandwidth Filter

This adjustment applies to:

All 8590 E-Series and L-Series spectrum analyzers 8591C cable TV analyzers 8594Q QAM analyzers

The crystal and LC bandwidth ﬁlter circuits are adjusted for symmetry, center frequency, and peak amplitude.

First, correction constants are turned off. This allows for uncorrected 3 dB resolution bandwidth centering and amplitude adjustments.

New corrections are then generated by performing the CAL FREQ and CAL AMPTD adjustment routines.

Equipment Required

Crystal shorts (set of three) Cable, BNC, 23 cm (9 in)

Additional Equipment for 75 Ω Input

Cable, BNC, 75 Ω, 30 cm (12 in)

Procedure

1. Turn the analyzer LINE switch to OFF. Remove the instrument cover assembly.

2. Turn the analyzer LINE switch to ON, then press the following analyzer keys.

PRESET CAL, More 1 of 4 CORRECT ON OFF (OFF)

Chapter 2 49

Making Adjustments

5. Crystal and LC Bandwidth Filter

Crystal Alignment

3. Connect the CAL OUT to the INPUT 50 Ω with the BNC cable. 75 Ω input: Connect the CAL OUT to the INPUT 75 Ω with the 75 Ω

BNC cable.

Figure 2-9 Crystal Symmetry and Centering

CAUTION Use only 75 Ω cables, connectors, or adapters on instruments equipped

with 75 Ω inputs or damage to the input connectors will occur.

4. Press the following analyzer keys.

FREQUENCY, 300, MHz SPAN, 10, MHz PEAK SEARCH MKR FCTN, MK TRACK ON OFF (ON)

75 Ω input:

SPAN, 200, kHz AMPLITUDE, 20, −dBm SCALE LOG LIN (LIN) More 1 of 2, AMPTD UNITS, dBm BW, 3, kHz

AMPLITUDE, More 1 of 2, AMPTD UNITS, dBm

50 Chapter2

Making Adjustments

5. Crystal and LC Bandwidth Filter

5. Press AMPLITUDE, then use the knob to place the signal at the sixth graticule line from the bottom.

6. Press BW, 30, kHz on the analyzer.

CAUTION Shorting the crystal test points to ground may permanently damage the

bandwidth board assembly. If you make your own shorts, it is advisable to insulate the bare wires and connectors.

7. Connect the crystal shorts (through the access holes on the assembly cover) across the following pairs of test points.

A13TP1 and A13TP2 A11TP1 and A11TP2 A11TP4 and A11TP5

8. Adjust A13C54 CTR for minimum signal amplitude. Then adjust A13C38 SYM and A13C54 CTR for a centered and symmetrical bandpass response as shown in Figure 2-9.

9. Remove the crystal short from A13TP1 and A13TP2 and connect it across A13TP4 and A13TP5.

10.Adjust A13C25 CTR for minimum signal amplitude. Then adjust A13C15 SYM and A13C25 CTR for a centered and symmetrical bandpass response.

11.Remove the crystal short from A11TP4 and A11TP5. Connect the short across A13TP1 and A13TP2.

12.Adjust A11C54 CTR for minimum signal amplitude. Then adjust A11C38 SYM and A11C54 CTR for a centered and symmetrical bandpass response.

13.Remove the crystal short from A11TP1 and A11TP2. Connect the short across A11TP4 and A11TP5.

14.Adjust A11C25 CTR for minimum signal amplitude. Then adjust A11C15 SYM and A11C25 CTR for a centered and symmetrical bandpass response.

Chapter 2 51

Making Adjustments

5. Crystal and LC Bandwidth Filter

15.Remove the crystal shorts and press the following analyzer keys.

PEAK SEARCH MKR FCTN, MK TRACK ON OFF (ON) SPAN, 50, kHz MKR FCTN, MK TRACK ON OFF (OFF) BW, 3, kHz PEAK SEARCH, MARKER DELTA BW, 30, kHz PEAK SEARCH

16.Verify that the MARKER ∆ frequency does not exceed 3 kHz. If the signal shift is out of tolerance, repeat step 3 to step 16.

17.Press the following analyzer keys.

MKR MARKER 1 ON OFF (OFF)

52 Chapter2

Making Adjustments

5. Crystal and LC Bandwidth Filter

LC Alignment

18.Press the following analyzer keys.

BW, 100, kHz SPAN, 5, MHz

19.Widen all but one of the LC ﬁlter poles by shorting A11TP10 and A11TP11, A11TP12 and A11TP13, and A13TP10 and A13TP11 using the crystal shorts.

CAUTION Use a tool with a nonmetallic body to make the LC dip adjustment.

Shorting components to ground may result in permanent damage to the bandwidth board assembly.

20.Center the signal on the analyzer display by pressing the following analyzer keys.

PEAK SEARCH MKR FCTN, MK TRACK ON OFF (ON)

21.Adjust A13C47 LC dip for a minimum signal amplitude.

22.Move the short from A13TP10 and A13TP11 to A13TP12 and A13TP13, then adjust A13C17 LC dip for a minimum signal amplitude.

23.Move the short from A11TP10 and A11TP11 to A13TP10 and A13TP11, then adjust A11C17 LC dip for a minimum signal amplitude.

24.Move the short from A11TP12 and A11TP13 to A11TP10 and A11TP11, then adjust A11C47 LC dip for a minimum signal amplitude.

LC Centering

Note that the center frequency of the 100 kHz bandwidth is referenced to the 30 kHz bandwidth. During this procedure it is advisable to switch to the 30 kHz bandwidth occasionally and recenter it using

PEAK SEARCH, MARKER → CF.

25.Short A11TP10 and A11TP11, A11TP12 and A11TP13, and A13TP10 and A13TP11 using the crystal shorts used in the crystal alignment section. Press the following analyzer keys.

BW, 30, kHz SPAN, 200, kHz MKR FCTN, MK TRACK ON OFF (OFF) BW, 100, kHz

Chapter 2 53

Making Adjustments

5. Crystal and LC Bandwidth Filter

26.Adjust A13C45 LC CTR for maximum signal at center-screen.

27.Move the short from A11TP10 and A11TP11 to A11TP12 and A11TP13, then adjust A11C23 LC CTR for maximum signal at center-screen.

28.Move the short from A13TP12 and A13TP13 to A11TP10 and A11TP11, then adjust A13C45 LC CTR for maximum signal at center-screen.

29.Move the short from A13TP10 and A13TP11 to A13TP12 and A13TP13, then adjust A13C23 LC CTR for maximum signal at center-screen.

30.Disconnect all the shorts from A11 and A13 bandwidth board assemblies.

LC Amplitude

31.Press the following analyzer keys.

BW, 3, MHz SPAN, 2, MHz

32.Press AMPLITUDE and adjust the signal level one division below the top graticule using the knob.

33.Press the following analyzer keys.

PEAK SEARCH, MARKER ∆ MKR FCTN, MK TRACK ON OFF (ON) BW, 100, kHz

It may be necessary to occasionally recenter the 30 kHz bandwidth.

34.Adjust A11R26 LC and A13R26 LC equally for a MARKER ∆ amplitude of 0 dB. Each potentiometer should be adjusted to accomplish one-half of the necessary increase in signal amplitude. If A11R26 or A13R26 reaches its limit, recenter both potentiometers and repeat step 31 to step 35.

35.Press

MKR FCTN, MK TRACK ON OFF (OFF) on the analyzer.

54 Chapter2

Making Adjustments

5. Crystal and LC Bandwidth Filter

Final LC Centering

36.Press the following analyzer keys.

BW, 30, kHz SPAN, 100, kHz PEAK SEARCH, MARKER → CF BW, 100, kHz

37.Make ﬁnal adjustments by adjusting A11C23, A11C45, A13C23, and A13C45 in succession to peak the amplitude of the marker at center-screen.

38.Repeat step 36 and step 37 until the 30 kHz and 100 kHz bandwidths are centered in relation to each other.

39.Press the following analyzer keys.

BW, 30, kHz PEAK SEARCH MARKER ∆ BW, 100, kHz PEAK SEARCH

40.Verify that the MARKER ∆ frequency does not exceed 10 kHz. If the signal shift is out of tolerance, repeat step 26 to step 39.

Crystal Amplitude

41.Press the following analyzer keys.

BW, 30, kHz SPAN, 10, kHz PEAK SEARCH MARKER ∆ MKR FCTN, MK TRACK ON OFF (ON) BW, 1, kHz

42.Adjust A11R31 XTL and A13R31 XTL equally for a MARKER ∆ amplitude reading of 0 dB. Each potentiometer should be adjusted to accomplish one-half of the necessary increase in signal amplitude.

43.If A11R31 or A13R31 reaches its limit, recenter both potentiometers and repeat step 41 and step 42.

Chapter 2 55

Making Adjustments

5. Crystal and LC Bandwidth Filter

Final BW Amplitude Check

44.Run the “CAL FREQ Adjustment Routine” and the “CAL AMPTD Adjustment Routine.”

45.Remember to press CAL STORE after the completion of the routines to store data in nonvolatile memory.

46.Press the following analyzer keys to verify that the bandwidth amplitude corrections are within speciﬁcations.

CAL, More 1 of 4, More 2 of 4 SERVICE DIAG DISPLAY CAL DATA

47.Refer to the BW-AMP column of the analyzer display to locate the XTAL and LC bandwidth amplitude-correction numbers of the analyzer. All LC and XTAL bandwidth readings should be between

−0.8 dB to +0.5 dB. Table 2-1 describes and shows an example of the XTAL and LC bandwidth amplitude-correction numbers that will be displayed on the analyzer. Perform the following steps that apply to your analyzer.

• If the difference between the bandwidth amplitude-correction

numbers of the 30 kHz XTAL and 3 MHz LC is greater than

0.8 dB, pad A11R8 or A13R8 and repeat the Final BW Amplitude Check. Refer to the Component-Level Information Package for the location of A11R8 and A13R8.

• If the 30 kHz XTAL bandwidth amplitude correction is greater

than the 3 MHz LC bandwidth correction, increase the value of A11R8 or A13R8.

• If the 3 MHz LC bandwidth amplitude correction is greater than

the 30 kHz XTAL bandwidth correction, decrease the value of A11R8 or A13R8.

• If just the 100 kHz LC amplitude is out of range, repeat step 23 to

step 38 and step 44 to step 47.

• If the 1 kHz XTAL amplitude is out of the above range, repeat

step 44 to step 46.

56 Chapter2

Table 2-1 Bandwidth Amplitude-Correction Map

Resolution Bandwidths BW-AMP

not used 0.00 not used 0.00 not used 0.00 not used 0.00

XTAL: 9 kHz 0.00

300 Hz 0.46

1 kHz 0.06

3 kHz −0.02 10 kHz 0.00 30 kHz 0.00

LC: 100 kHz −0.27

300 kHz −0.40

1 MHz −0.43 3 MHz −0.47 5 MHz −0.54

120 kHz −0.17

Making Adjustments

5. Crystal and LC Bandwidth Filter

Correction Numbers

Chapter 2 57

Making Adjustments

6. Cal Attenuator Error

This adjustment applies to:

All 8590 E-Series and L-Series spectrum analyzers 8591C cable TV analyzers 8594Q QAM analyzers

The A12 amplitude control assembly has one 10 dB and two 20 dB nonadjustable ampliﬁers. It also has 1 dB, 2 dB, 4 dB, 8 dB, and 16 dB attenuators which are correctable. The 16 dB step is not used at this time.

The attenuator error correction procedure involves disabling the attenuator correction constants, determining the attenuator step errors, and entering the new correction constants into the analyzer memory.

Equipment Required

Synthesizer/level generator Cable, BNC, 120 cm (48 in) Adapter, Type N (m) to BNC (f)

Additional Equipment for Option 026

Adapter, Type BNC (f) to SMA (m)

Additional Equipment for 75 Ω Input

Cable, BNC, 75 Ω, 120 cm (48 in)

58 Chapter2

Making Adjustments

6. Cal Attenuator Error

Procedure

The accuracy of the amplitude control attenuator is critical to the proper calibration of the instrument; therefore, this procedure must be carefully and accurately performed.

1. Turn the analyzer

LINE switch to OFF. Remove the instrument cover

assembly.

2. Turn the analyzer LINE switch to ON.

3. Connect the 50 Ω output of the synthesizer/level generator to the analyzer INPUT 50 Ω. See Figure 2-10.

75 Ω input: Connect the 75 Ω output of the synthesizer/level generator to the analyzer INPUT 75 Ω.

Figure 2-10 Cal Attenuator Error Correction Setup

CAUTION Use only 75 Ω cables, connectors, or adapters on instruments equipped

with 75 Ω inputs or damage to the input connectors will occur.

4. Set the frequency of the synthesizer/level generator to 25 MHz and the output to −19 dBm.

5. To turn the amplitude attenuator correction constants off, press the following analyzer keys.

PRESET CAL, More 1 of 4 CORRECT ON OFF (OFF)

Chapter 2 59

Making Adjustments

6. Cal Attenuator Error

1 dB Step Check

6. To measure the 1 dB step correction, press the following analyzer keys.

FREQUENCY, 25, MHz SPAN, 10, MHz

75 Ω input: AMPLITUDE, More 1 of 2, AMPTD UNITS, dBm

AMPLITUDE, 18, −dBm SCALE LOG LIN (LIN), More 1 of 2 AMPTD UNITS, dBm PEAK SEARCH MKR FCTN, MK TRACK ON OFF (ON) SPAN, 50, kHz BW, 3, kHz VID BW AUTO MAN, 300, Hz

7. Press the following analyzer keys.

PEAK SEARCH, MARKER DELTA MKR FCTN, MK TRACK ON OFF (ON)

8. The MKR ∆ amplitude reading should be 0.0 dB ±0.01 dB. If it is not, repeat step 7.

9. Set the analyzer by pressing

AMPLITUDE, 17, −dBm.

10.Set the amplitude of the synthesizer/level generator to −18 dBm.

11.Press

MKR on the analyzer.

12.Record the MKR ∆ amplitude reading in Table 2-2. This is the 1 dB attenuator step error of the A12 amplitude control assembly.

60 Chapter2

Making Adjustments

6. Cal Attenuator Error

2 dB Check

13.Press the following analyzer keys.

AMPLITUDE, 16, −dBm.

14.Set the amplitude of the synthesizer/level generator to −17 dBm.

15.Press the following analyzer keys.

PEAK SEARCH MARKER DELTA, MARKER DELTA MKR FCTN, MK TRACK ON OFF (ON)

16.MKR ∆ amplitude reading should be 0.0 ±0.01. If it is not, repeat step 15.

17.Set the analyzer by pressing

AMPLITUDE, 14, −dBm.

18.Set the amplitude of the synthesizer/level generator to −15 dBm.

19.Press

MKR on the analyzer.

20.Record the MKR ∆ amplitude reading in Table 2-2. This is the 2 dB attenuator step error of the A12 amplitude control assembly.

4 and 8 dB Step Error

21.Repeat step 13 to step 20 for attenuator steps 4 dB and 8 dB. Use

Table 2-2 for synthesizer values and analyzer reference-level values.

Table 2-2 A12 Amplitude Control Assembly Attenuator Errors

SynthesizerSettings(dBm) Reference Level Settings

(dBm)

Attenuator

OFF

−19 −18 −18 −17 1 ____________

AttenuatorONAttenuator

OFF

Attenuator

Step (dB)

Error

−17 −15 −16 −14 2 ____________

−18 −14 −17 −13 4 ____________

−19 −11 −18 −10 8 ____________

Chapter 2 61

Making Adjustments

6. Cal Attenuator Error

Entering Attenuator Error Correction Data

22.Press the following analyzer keys.

PRESET

75 Ω input: AMPLITUDE, More 1 of 2, AMPTD UNITS, dBm

FREQUENCY, −2001, Hz CAL, More 1 of 4, More 2 of 4 SERVICE CAL, SET ATTN ERROR

Note that the frequency of −2001 Hz is necessary to access the

SERVICE CAL routines.

23.When the analyzer prompts you with the message ENTER CAL ATTEN ERROR, enter the data from Table 2-2 and terminate with

the reverse sign using the error recorded in Table 2-2 is 0.07, enter 0.07 and terminate with

−dBm.

dBm or −dBm keys. For example, if the

24.When the analyzer prompts you to enter the 16 dB step, enter 0 dBm. At the completion of entering the 16 dB error, the analyzer will reset.

25.To conﬁrm that the correct data is stored, access the cal attenuator corrections by pressing the following analyzer keys.

CAL, More 1 of 4, More 2 of 4 SERVICE DIAG DISPLAY CAL DATA

Note that the cal-attenuator correction data are the ﬁrst ﬁve corrections located in the ERR column.

62 Chapter2

Making Adjustments

7. Log and Linear Ampliﬁer

This adjustment applies to:

All 8590 E-Series and L-Series spectrum analyzers 8591C cable TV analyzers 8594Q QAM analyzers

A 21.4 MHz signal is injected into an IF test board that has been inserted in place of the ﬁrst resolution bandwidth assembly, A11. The gain of the A14 log ampliﬁer assembly is adjusted by observing the voltage at the AUX VIDEO OUT on the rear panel with a digital multimeter.

Equipment Required

Synthesizer/level generator Digital multimeter (DMM) IF test board Cable, BNC, 120 cm (48 in) Cable, BNC (f) to dual banana plug Test cable

Chapter 2 63

Making Adjustments

7. Log and Linear Ampliﬁer

Procedure

1. Turn the analyzer LINE switch to OFF. Remove the instrument cover assembly.

2. Remove the ﬁrst IF bandwidth ﬁlter assembly, A11. Install the IF test board into the A11 slot. Turn the analyzer

3. Set the DMM to read dc volts.

4. Press the following analyzer keys.

PRESET CAL, More 1 of 4 CORRECT ON OFF (OFF), More 2 of 4 SERVICE DIAG STP GAIN ZERO SPAN, 0, Hz

LINE switch to ON.

BW, 10, kHz VID BW AUTO MAN, 300, Hz AMPLITUDE, 10, −dBm SCALE LOG LIN (LIN)

5. Set the synthesizer as follows:

FREQUENCY ............................................. 21.4MHz

MANUAL TUNE ................................................... ON

AMPTD INCR .............................................. 0.01 dBm

AMPLITUDE .................................................. −6 dBm

6. Connect equipment as shown in Figure 2-11. Connect the output of the synthesizer to J2 of the IF test board. Connect the DMM to AUX VIDEO OUT (located on the rear panel).

64 Chapter2

Figure 2-11 Log and Linear Ampliﬁer Adjustment Setup

Making Adjustments

7. Log and Linear Ampliﬁer

Log Fidelity Adjustment

7. Adjust the synthesizer knob for maximum signal amplitude on the display. Adjust the synthesizer amplitude as necessary to keep the signal on the display.

8. Adjust the synthesizer output level for a DMM reading of 1000 mV ±1.0 mV. Record the synthesizer amplitude readout for later reference:

____________________dBm

9. Press

10.Press

11.Set the synthesizer to the level recorded in step 8 and adjust A14R23 SLOPE (refer to Figure 2-12) for a DMM reading of 1000 mV ±1mV.

AMPTD, INCR, 10, dB on the synthesizer. SCALE (LOG) on the analyzer.

Chapter 2 65

Making Adjustments

7. Log and Linear Ampliﬁer

Figure 2-12 Log and Linear Ampliﬁer Adjustment Location

12.Set the synthesizer amplitude 60 dB below that recorded in step 8 by pressing

AMPLITUDE and then pressing ⇓ (step-down key) six times.

Adjust A14R10 OFFSET for the DMM reading of 250 mV ±1mV.

13.Repeat step 10 and step 11 until no further adjustment is necessary.

14.Set the synthesizer amplitude 30 dB below that recorded in step 8 and adjust the A14R23 SLOPE for a DMM reading of 625 mV ±1mV.

15.Set the synthesizer amplitude to the level recorded in step 8 and adjust the A14R69 −30 dB for a DMM reading of 1000 mV ±1mV.

16.Repeat step 13 and step 14 until no further adjustment is necessary.

17.Set the synthesizer amplitude 10 dB below that recorded in step 8 and adjust the A14R23 SLOPE for a DMM reading of 875 mV ±1mV.

18.Set the synthesizer amplitude to the level recorded in step 8 and adjust the A14R39 −10 dB for a DMM reading of 1000 mV ±1mV.

19.Repeat step 16 and step 17 until no further adjustment is necessary.

20.Repeat step 10 to step 18 until the limits in Table 2-3 are met.

66 Chapter2

Table 2-3 Log Fidelity Check

Synthesizer Level DMM Reading

Reference from step 8 1000 mV ±1mV

Reference − 10 dB 875 mV ±3mV Reference − 20 dB 750 mV ±4mV Reference − 30 dB 625 mV ±4mV Reference − 40 dB 500 mV ±5mV Reference − 50 dB 375 mV ±6mV Reference − 60 dB 250 mV ±7mV Reference − 70 dB 125 mV ±8mV

Linear Output and Step Gain Adjustments

Making Adjustments

7. Log and Linear Ampliﬁer

21.Press the following analyzer keys.

AMPLITUDE, 50, −dBm SCALE LOG LIN (LIN), More 1 of 2 AMPTD UNITS, dBm

22.Set the synthesizer amplitude to the level recorded in step 8 and adjust A14R34 LIN for a DMM reading of 1000 mV ±1mV.

23.Make the adjustments indicated in Table 2-9.

Table 2-4 Linear Gain Check

Adjust Synthesizer Level Reference

A14R34 Reference from step 8 −50 1000 mV ±1mV A14R33 Reference − 10 dB −60 1000 mV ±5mV A14R30 Reference − 20 dB −70 1000 mV ±5mV A14R27 Reference − 30 dB −80 1000 mV ±5mV

N/A Reference − 40 dB −90 1000 mV ±30 mV

DMM Reading

Level (dBm)

Chapter 2 67

Making Adjustments

8. CAL FREQ Adjustment Routine

This adjustment applies to:

All 8590 E-Series and L-Series spectrum analyzers 8591C cable TV analyzers 8594Q QAM analyzers

CAL FREQ softkey accesses an internal self-adjustment routine.

The The “CAL FREQ Adjustment Routine” adjusts the analyzer to obtain frequency accuracy using CAL OUT signal. The following adjustments are automatically performed by

Sweeptime calibration YTO offset and slope FM coil timing constants

CAL FREQ routine.

Span attenuator FM detector sensitivity

Equipment Required

Cable, BNC, 20 cm (9 in) Adapter, Type N (m) to BNC (f)

Additional Equipment for Option 026

Adapter, Type APC-3.5 (f) to APC-3.5 (f)

Additional Equipment for 75 Ω Input

Cable, BNC, 75 Ω, 30 cm (12 in)

68 Chapter2

Procedure

Interrupting this routine may result in corrupt data being stored in RAM. If this occurs, rerun the

1. Connect the CAL OUT to the INPUT 50 Ω with the BNC cable. See

Figure 2-13.

75 Ω input: Connect the CAL OUT to the INPUT 75 Ω with the 75 Ω BNC cable.

Figure 2-13 CAL FREQ Adjustment Routine Setup

CAL FREQ adjustment routine.

Making Adjustments

8. CAL FREQ Adjustment Routine

CAUTION Use only 75 Ω cables, connectors, or adapters on instruments equipped

with 75 Ω inputs or damage to the input connectors will occur.

2. Press the following analyzer keys.

CAL, CAL FREQ

The CAL FREQ adjustment routine will take a few minutes to run. The internal adjustment data will be stored in working RAM. To store

this data in nonvolatile memory, press CAL STORE. If the

CAL AMPTD adjustment routine has not been done, the following

error message will be displayed: 'CAL: DATA NOT STORED' and 'CAL AMP NEEDED'. Proceed with the then press

CAL STORE when done.

CAL AMPTD adjustment routine and

Chapter 2 69

Making Adjustments

9. CAL AMPTD Adjustment Routine

This adjustment applies to:

All 8590 E-Series and L-Series spectrum analyzers 8591C cable TV analyzers 8594Q QAM analyzers

CAL AMPTD softkey accesses an internal self-adjustment routine.

The The following adjustments are automatically performed by

• The reference level is calibrated by adjusting the gain of the IF section.

• The 3 dB resolution bandwidths are adjusted.

• Bandwidth amplitude errors are determined. Errors are corrected with video offsets.

CAL AMPTD.

• Step-gain and input-attenuator errors are determined. Errors are corrected with video offsets.

• Log ﬁdelity is checked in 1 dB steps. Errors are corrected with video offsets.

• Frequency accuracy is tested and adjusted by using frequency offsets.

Equipment

Cable, BNC, 20 cm (9 in) Adapter, Type N (m) to BNC (f)

Additional Equipment for Option 026

Adapter, Type APC-3.5 (f) to APC-3.5 (f)

Additional Equipment for 75 Ω Input

Cable, BNC, 75 Ω, 30 cm (12 in)

70 Chapter2

Procedure

It is recommended to complete the “CAL FREQ Adjustment Routine” prior to performing the “CAL AMPTD Adjustment Routine.”

1. Connect the CAL OUT to the INPUT 50 Ω using a BNC cable. See

Figure 2-14.

75 Ω input: Connect the CAL OUT to the INPUT 75 Ω with the 75 Ω BNC cable.

Figure 2-14 CAL AMPTD Adjustment Routine Setup

Making Adjustments

9. CAL AMPTD Adjustment Routine

CAUTION Use only 75 Ω cables, connectors, or adapters on instruments equipped

with 75 Ω inputs or damage to the input connectors will occur.

2. Press the following analyzer keys.

CAL, CAL AMPTD

The CAL AMPTD routine takes approximately 5 to 7 minutes to run. The internal adjustment data will be stored in working RAM. To store this data in nonvolatile memory, press

CAL STORE.

Chapter 2 71

Making Adjustments

10. CAL YTF Adjustment Routine

This adjustment applies to:

8592L spectrum analyzers 8593E spectrum analyzers 8595E spectrum analyzers 8596E spectrum analyzers

CAL YTF softkey accesses an internal adjustment routine. This

The routine adjusts the slope and offset of the A3A8 YTF tune voltage for each harmonic mixing band. The “CAL FREQ Adjustment Routine” must be performed prior to this adjustment.

Equipment Required

Cable, Type N (m) to SMA (m) (part number 8120-5148)

Additional Equipment for Option 026

Cable, SMA (m) to (m) Adapter, Type APC-3.5 (f) to APC-3.5 (f)

Additional Equipment for Model 8595E

Cable, BNC, 20 cm (9in)

72 Chapter2

Procedure

1. Perform the CAL FREQ routine as indicated in the “CAL FREQ Adjustment Routine” in this chapter.

2. Connect the 100 MHz COMB OUT to INPUT 50 Ω using the YTF CAL cable. Refer to Figure 2-15.

Model 8595E only: Connect the CAL OUT to the INPUT 50 Ω using a BNC cable.

Figure 2-15 CAL YTF Adjustment Setup

Making Adjustments

10. CAL YTF Adjustment Routine

3. Press the following keys.

PRESET CAL, CAL YTF

The CAL YTF routine will take a few minutes to run. The message “CAL: DONE” will be displayed when the routine has ﬁnished. The internal adjustment data will be stored in working RAM.

If the message “LOST COMB SIGNAL” is displayed, perform the Mixer Bias DAC Initialization procedure.

4. Press

CAL STORE to store the YTF correction data in nonvolatile

memory.

Mixer Bias DAC Initialization

If the message “LOST COMB SIGNAL” is displayed, the current mixer bias DAC settings may not be adequate to ensure that a comb signal is displayed. Initialization of the mixer bias DAC may be required.

Perform this procedure only if the “LOST COMB SIGNAL” message is displayed while performing the ﬁrmware is version 3.1.90 or later.

CAL YTF routine and the analyzer

Chapter 2 73

Making Adjustments

10. CAL YTF Adjustment Routine

1. Press the following keys to activate title mode.

PRESET CAL, More 1 of 4, More 2 of 4 SERVICE DIAG DISPLAY CAL DATA

2. Record the displayed “Optimum Bias” DAC values for each frequency band.

Table 2-5 Acceptable Mixer Bias DAC Correction Values

Band Optimum Bias Acceptable

1 _________________ 800 to 1900 2 _________________ 0 to 200 3 _________________ 1000 to 1800

Bias Range

4 _________________ 400 to 750

3. If the recorded “Optimum Bias” values are within the acceptable ranges indicated in Table 2-5, RF section troubleshooting is necessary.

If the recorded “Optimum Bias” values are not within the acceptable ranges indicated in Table 2-5, complete the rest of this procedure to initialize the mixer bias DAC values.

4. Press the following keys to allow entry of the default mixer bias DAC values.

PRESET FREQUENCY, −2001, Hz DISPLAY CHANGE TITLE

5. Enter CALMXRDATA 1600,1; as a title entry to set the mixer bias value to 1600 for band 1.

6. Press the following keys to store the mixer bias value for band 1 in nonvolatile memory.

CAL, More 1 of 4, More 2 of 4 SERVICE CAL EXECUTE TITLE

74 Chapter2

Making Adjustments

10. CAL YTF Adjustment Routine

7. Press the following keys to allow entry of the default mixer bias DAC value for band 2.

DISPLAY CHANGE TITLE CLEAR

8. Enter CALMXRDATA 20,2; as a title entry to set the mixer bias value to 20 for band 2.

Press the following keys to store the mixer bias value for band 2 in nonvolatile memory.

CAL, More 1 of 4, More 2 of 4 SERVICE CAL EXECUTE TITLE

9. Press the following keys to allow entry of the default mixer bias DAC value for band 3.

DISPLAY CHANGE TITLE CLEAR

10.Enter CALMXRDATA 1300,3; as a title entry to set the mixer bias value to 1300 for band 3.

11.Press the following keys to store the mixer bias value for band 3 in nonvolatile memory.

CAL, More 1 of 4, More 2 of 4 SERVICE CAL EXECUTE TITLE

12.Press the following keys to allow entry of the default mixer bias DAC value for band 4.

DISPLAY CHANGE TITLE CLEAR

13.Enter CALMXRDATA 520,4; as a title entry to set the mixer bias value to 520 for band 4.

Chapter 2 75

Making Adjustments

10. CAL YTF Adjustment Routine

14.Press the following keys to store the mixer bias value for band 4 in nonvolatile memory.

CAL, More 1 of 4, More 2 of 4 SERVICE CAL EXECUTE TITLE

15.Press the following keys to check the default mixer bias DAC values.

PRESET CAL, More 1 of 4, More 2 of 4 SERVICE DIAG DISPLAY CAL DATA

Conﬁrm that the “Optimum Bias” DAC values displayed for band 1 through band 4 are 1600, 20, 1300, and 520.

16.Repeat the CAL YTF adjustment procedure.

17.Perform the CAL MXR adjustment procedure.

76 Chapter2

Making Adjustments

11. CAL MXR Adjustment Routine

This adjustment applies to:

8592L spectrum analyzers 8593E spectrum analyzers 8595E spectrum analyzers 8596E spectrum analyzers

CAL MXR softkey accesses an internal adjustment routine which

The optimizes the dc bias for the A3A6 Dual Band Mixer when in high band (2.75 to 22 GHz). The CAL YTF routine must be performed prior to this adjustment. New frequency response correction constants must be developed following the CAL MXR Adjustment Routine.

Equipment Required

Cable, Type N (m) to SMA (m)

Additional Equipment for Option 026

Cable, CAL Comb Adapter, Type APC-3.5 (f) to APC-3.5 (f)

Additional Equipment for Model 8595E

Cable, BNC, 20 cm (9in)

Chapter 2 77

Making Adjustments

11. CAL MXR Adjustment Routine

Procedure

1. Perform the CAL YTF routine as indicated in the “CAL YTF Adjustment Routine” in this chapter.

2. Connect the 100 MHz COMB OUT to INPUT 50 Ω using the CAL YTF cable (Type N to SMA cable). Refer to Figure 2-16.

Model 8595E only: Connect the CAL OUT to the INPUT 50 Ω using a BNC cable.

Figure 2-16 CAL MXR Adjustment Setup

3. Press the following analyzer keys.

PRESET FREQUENCY, −2001, Hz CAL, More 1 of 4, More 2 of 4 SERVICE CAL, CAL MXR

Note that the frequency of −2001 Hz is necessary to access the

SERVICE CAL routines.

CAL MXR routine will take a few minutes to run. The message

The “CAL: DONE” will be displayed when the routine has ﬁnished. The internal adjustment data will be stored in working RAM.

4. Press

CAL STORE to store the correction data in nonvolatile memory.

78 Chapter2

Making Adjustments

12. Second Converter

This adjustment applies to:

8590L spectrum analyzers 8591E spectrum analyzers 8591C cable TV analyzers

The RF output of the tripler is adjusted by observing an analyzer connected to the 321.4 MHz second converter output, and adjusting the slug-tuned cavity for maximum signal.

The second IF bandpass ﬁlter is adjusted for a 2.1214 GHz bandpass using the Dishal method. The second mixer match is adjusted for maximum output.

The LO is swept through the range of the 2.1214 GHz bandpass while the output is observed with an analyzer and the characteristics are evaluated.

Equipment Required

Microwave spectrum analyzer Tuning tool Cable, SMB (f) to BNC (m) Adapter, SMB (f) to SMB (f) Adapter SMB (m) to SMB (m) Adapter, N (m) to BNC (f)

Chapter 2 79

Making Adjustments

12. Second Converter

Procedure

Tripler Adjustment

1. Turn the analyzer LINE switch to OFF. Remove the instrument cover assembly. Refer to the “Instrument Cover” removal procedure in

Chapter 3.

2. Turn the analyzer

3. Press INSTRUMENT PRESET on the microwave spectrum analyzer and set the controls as follows:

CENTER FREQUENCY ............................... 1.8GHz

FREQUENCY SPAN ..................................... 10 MHz

REFERENCE LEVEL .................................. −20dBm

dB/DIV ......................................................... 2 dB/DIV

4. Connect the microwave spectrum analyzer to the 2ND LO 1.8 GHz port on the A5 Second Converter using SMB adapters and the test cable. See Figure 2-17.

Figure 2-17 Tripler Adjustment Setup

LINE switch to ON.

5. Use the tuning tool to adjust A5C4 FREQUENCY TRIPLER (see

Figure 2-18) for maximum signal amplitude as observed on the

analyzer. Readjust the reference level of the microwave spectrum analyzer as necessary to keep the signal on screen. The 1.8 GHz signal should be −19 dBm to −24 dBm.

80 Chapter2

Note that when adjusting with the tuning tool, the signal amplitude will change as the lock nuts are tightened. Optimum signal amplitude should be maintained while tightening these lock nuts.

Figure 2-18 Second Converter Adjustment Location

Making Adjustments

12. Second Converter

Second Converter Bandpass

6. Set the microwave spectrum analyzer controls as follows:

CENTER FREQUENCY ......................... 2.1214GHz

FREQUENCY SPAN ....................................... 5 MHz

REFERENCE LEVEL .................................. −30dBm

7. Connect the microwave spectrum analyzer to the BP ALIGN port on

the A5 Second Converter of the analyzer using the test cable. See

Figure 2-17.

Figure 2-19 Second Converter Bandpass Adjustment Setup

Chapter 2 81

Making Adjustments

12. Second Converter

8. With nothing connected to the analyzer INPUT 50 Ω (Option 001: INPUT 75 Ω), press the following keys.

PRESET PEAK SEARCH MKR FCTN, MK TRACK ON OFF (ON) SPAN, 10, MHz

Wait for AUTO ZOOM message to disappear.

9. Set the analyzer as follows:

MKR FCTN, MK TRACK ON OFF (OFF) SPAN, 0, Hz

10.Loosen the lock nut on A5C1, A5C2, and A5C3. Carefully turn tuning screws clockwise until they reach the bottom of the cavity. Do

not force the tuning screws down.

11.Turn A5C1 counterclockwise for a peaked signal on the 8566A/B. Lightly tighten the lock nut.

12.Turn A5C2 counterclockwise for a minimum signal on the analyzer. Lightly tighten the lock nut.

13.Turn A5C3 counterclockwise for peak signal on the analyzer. Lightly tighten the lock nut.

14.Repeat step 11 to step 13 until no further improvement is noticeable. Tighten the lock nuts without changing the amplitude on the display.

Second Mixer Match

15.After removing W10, connect the microwave spectrum analyzer to the 2ND CONV OUT port (see Figure 2-18) using the test cable. See

Figure 2-20.

82 Chapter2

Figure 2-20 Second Mixer Match Adjustment Setup

16.Set the microwave spectrum analyzer controls as follows:

CENTER FREQUENCY .......................... 321.4 MHz

Making Adjustments

12. Second Converter

REFERENCE LEVEL .................................. −40dBm

SPAN .............................................................. 20 MHz

dB/DIV ......................................................... 1 dB/DIV

17.Adjust A5 2ND MIXER MATCH (refer to Figure 2-18) for maximum

amplitude as displayed on the microwave spectrum analyzer. Adjust the reference level as necessary to keep the signal near top-screen.

Swept Bandpass Check

18.Set the analyzer controls as follows:

SPAN, 20, MHz SWEEP, 20, SEC

19.On the microwave spectrum analyzer, press trace B and MAX

HOLD. Wait for at least one complete sweep. Then press the following keys to measure the 3 dB bandwidth.

TRACE B VIEW A ⇐⇒ B PEAK SEARCH MARKER MODE, ∆

20.Rotate the knob counterclockwise so that the marker delta

amplitude reads −3 dB.

Chapter 2 83

Making Adjustments

12. Second Converter

21.Press MARKER MODE, ∆ and rotate the knob clockwise so that the marker delta amplitude reads 0 dB and is on the right-hand side of the response. Read the marker delta frequency; it should be 15 MHz ±2.5 MHz. See Figure 2-21.

22.The maximum ripple should be less than 1 dB for a bandwidth of 6 MHz.

Figure 2-21 Second Converter Bandpass Ripple Measurement

84 Chapter2

Making Adjustments

13. Third Converter and Second IF Bandpass

This adjustment applies to:

All 8590 E-Series and L-Series spectrum analyzers 8591C cable TV analyzers 8594Q QAM analyzers

The 321.4 MHz, second IF bandpass ﬁlter is adjusted for maximum signal amplitude.

The CAL OUT amplitude is measured and adjusted for −20 dBm ±0.4 dB. The insertion loss of a low-pass ﬁlter (LPF) and 10 dB attenuator are characterized. The harmonics of the CAL OUT signal are suppressed with the LPF before the amplitude accuracy is measured using a power meter.

Equipment Required

Synthesized sweeper Microwave spectrum analyzer Measuring receiver (used as a power meter) Power meter Low power sensor with a 50 MHz reference attenuator Power sensor, 300 MHz Power splitter Attenuator, 10 dB, Type N (m to f), dc-12.4 GHz Low-pass ﬁlter, 300 MHz IF test board Cable, Type N, 152 cm (60 in) Cable, BNC, 120 cm (48 in) Test cable, SMB (f) to BNC (m) (two required) Adapter, APC 3.5 (f) to Type N (f) Adapter, Type N (f) to BNC (m) (two required) Adapter, Type N (m) to BNC (f)

Chapter 2 85

Making Adjustments

13. Third Converter and Second IF Bandpass

Additional Equipment for Models 8590L Option 713

Microwave frequency counter

Additional Equipment for 75 Ω Input

Adapter, minimum loss Adapter, 75 Ω to 50 Ω Adapter, Type N (f) 75 Ω to BNC (m) 75 Ω Cable, BNC, 75 Ω, 30 cm (12 in)

Procedure

Second IF Bandpass Filter

1. Press INSTRUMENT PRESET on the microwave spectrum analyzer, then set the controls as follows:

CENTER FREQUENCY ............................ 21.4 MHz

FREQUENCY SPAN ..................................... 50 MHz

REFERENCE LEVEL .................................. −30dBm

dB/DIV ......................................................... 1 dB/DIV

2. Set the synthesized sweeper controls as follows:

CW ............................................................. 321.4 MHz

POWER LEVEL ........................................... −26dBm

3. Turn the analyzer assembly.

4. Remove the ﬁrst IF bandwidth ﬁlter assembly, A11.

5. Install the IF test board into the A11 slot.

6. Remove the W9 cable from A9J4, 321.4 MHz IF INPUT.

7. Connect the synthesized sweeper output to A9J4. Refer to

Figure 2-22.

LINE switch to OFF. Remove the instrument cover

86 Chapter2

13. Third Converter and Second IF Bandpass

Figure 2-22 Second IF Bandpass Filter Adjustment Setup

Making Adjustments

8. Press the analyzer

LINE switch to ON.

9. Press the following analyzer keys.

PRESET SPAN, 0, Hz

10.Connect the microwavespectrum analyzer RF INPUT to J1 of the IF test board. Refer to Figure 2-22.

11.Adjust A9C44, A9C46, and A9C47 for maximum signal amplitude as observed on the microwave spectrum analyzer. Adjust the reference level of the microwave spectrum analyzer, as necessary, to display the signal below the top graticule.

12.Remove the test board from the A11 slot and install the A11 bandwidth ﬁlter assembly.

13.Reconnect W9 to A9J4, 321.4 MHz INPUT. If you are adjusting an 8590L Option 713, continue with the

“600 MHz Adjustment.” If you are adjusting an 8591C 8591E, 8593E, 8594E, 8594Q, 8595E,

or 8596E, continue with the “LPF, Attenuator and Adapter Insertion Loss Characterization.”

Chapter 2 87

Making Adjustments

13. Third Converter and Second IF Bandpass

600 MHz Adjustment

14.Set the microwave frequency counter controls as follows:

50 Ω/1 MΩ ......................................... 50 Ω Impedance

10 Hz–500 MHz/500 MHz–18 GHz . 10 Hz–500 MHz

SAMPLE RATE .......................................... Midrange

15.Disconnect W8 from A9J5 600 MHz OUT, then connect the

microwave frequency counter to A9J5.

16.Adjust A9R68, 600 MHz ADJ, for a frequency of 600 MHz±2 kHz

(599.998000 MHz to 600.002000 MHz).

17.Remove the test cable from A9J5, then reconnect W8.

18.Continue with “LPF, Attenuator and Adapter Insertion Loss

Characterization.”

LPF, Attenuator and Adapter Insertion Loss Characterization

19.Zero and calibrate the measuring receiver and power sensor

combination in LOG mode as described in the measuring receiver operation manual.

CAUTION Do not attempt to calibrate the power sensor without the reference

attenuator or damage to the power sensor will occur.

20.Zero and calibrate the power meter and 300 MHz power sensor, as

described in the power meter operation manual.

21.Connect the equipment as shown in Figure 2-23. Connect the

300 MHz power sensor directly to the Power Splitter (bypass the LPF, Attenuator and Adapters).

88 Chapter2

Figure 2-23 LPF Characterization

Making Adjustments

13. Third Converter and Second IF Bandpass

22.Press INSTRUMENT PRESET on the synthesized sweeper. Set the controls as follows:

CW ................................................................ 300 MHz

POWER LEVEL ........................................... −15dBm

23.Allow the power sensors to settle, then on the measuring receiver, press RATIO mode. Power indication should be 0 dB.

24.On the power meter, press the dB REF mode key. Power indication should be 0 dB.

25.Connect the LPF, Attenuator and adapters as shown in Figure 2-23.

26.Record the measuring receiver reading in dB. This is the relative error due to mismatch.

Mismatch Error____________________dB

27.Record the power meter reading in dB. This is the relative uncorrected insertion loss of the LPF, attenuator, and adapters.

Uncorrected Insertion Loss____________________dB

Chapter 2 89

Making Adjustments

13. Third Converter and Second IF Bandpass

28.Subtract the Mismatch Error (step 22) from the Uncorrected Insertion Loss (step 22). This is the corrected insertion loss.

Corrected Insertion Loss____________________dB

For example, if the Mismatch Error is +0.3 dB and the uncorrected Insertion Loss is −10.2 dB, subtracting the mismatch error to the insertion loss gives a corrected reading of −10.5 dB.

300 MHz Calibrator Amplitude Adjustment

29.Connect the equipment as shown in Figure 2-24. The analyzer should be positioned so that the setup of the adapters, LPF and attenuator do not bind. It may be necessary to support the center of gravity of the devices.

Figure 2-24 300 MHz Calibrator Amplitude Accuracy Test Setup

30.On the power meter, press the dBm mode key. Record the power meter reading in dBm.

Power Meter Reading____________________dBm

31.Subtract the Corrected Insertion Loss (step 23) from the power meter reading (step 25) and record as the CAL OUT power. The CAL OUT should be −20 dBm ±0.4 dB.

CAL OUT Power = Power Meter Reading − Corrected Insert Loss

90 Chapter2

Making Adjustments

13. Third Converter and Second IF Bandpass

For example, if the Corrected Insertion Loss is −10.0 dBm, and the measuring receiver reading is −30 dBm, then −30 dBm − (−10.0) dBm = −20 dBm.

CAL OUT Power____________________dBm

32.Adjust A9R19 CAL OUT ADJ accordingly if the CAL OUT amplitude is not −20 dBm ±0.4 dB as calculated in step 26.

Chapter 2 91

Making Adjustments

14. Comb Generator

This adjustment applies to:

8592L spectrum analyzers 8593E spectrum analyzers 8596E spectrum analyzers

The output signal from the A3A1 comb generator assembly, with the Step Recovery Diode Module (SRD) disconnected, is adjusted for maximum peak-to-peak voltage. A3A1C5 FREQ is centered, and the comb generator frequency is measured with a frequency counter. If the measured frequency is not 100.000 MHz ±0.0004 MHz, A3A1L3 is selected to bring the frequency within tolerance.

The comb generator signal is adjusted for maximum output power as measured with a measuring receiver (used as a power meter). If the amplitude is not +26.0 ±0.8 dBm, A3A1R6 is selected to bring the amplitude within tolerance.

A3A1C5 FREQ is adjusted for a comb generator frequency of

100.000000 MHz ±0.000010 MHz (tolerance of ±10 Hz).

Equipment Required

Oscilloscope Frequency counter Measuring receiver (used as a power meter) Power sensor, 300 MHz Attenuator, 20 dB Cable, SMA, 90 cm (36 in.) Cable, BMC, 120 cm (48 in.) Adapter, Type N (m) to SMA (f) Adapter, Type N (f) to Type N (f) Adapter, Type N (m) to BNC (f)

92 Chapter2

Figure 2-25 Comb Generator Adjustment Location

Making Adjustments

14. Comb Generator

Procedure

1. Turn the analyzer LINE switch to OFF. Remove the instrument cover assembly.

2. Remove the front-end assembly. Refer to the “Front-End Assembly” removal procedure.

3. Remove the A3A1 comb generator assembly from the front-end assembly and place in a service position, leaving W13 connected to the A7 Analog Interface.

4. Remove W24 from the A3A1J1 comb generator output connector. Connect the SMA cable to A3A1J1. Refer to Figure 2-25.

5. Turn the analyzer

6. Press the following analyzer keys.

AUX CTRL, COMB GEN ON OFF (ON)

LINE switch to ON.

Chapter 2 93

Making Adjustments

14. Comb Generator

Frequency

7. Connect the other end of the SMA cable to the 20 dB attenuator. Connect the output of the 20 dB attenuator to the 10 Hz to 500 MHz input of the frequency counter using adapters and the BNC cable.

8. Adjust A3A1C5 FREQ for 100.000000 MHz ±0.00004 MHz. Refer to

Figure 2-25 for adjustment location.

9. Disconnect the BNC cable from the frequency counter and 20 dB attenuator, then connect the BNC cable to CH1 of the oscilloscope. Set the oscilloscope by activating AUTOSCALE, located under the setup key.

10.Adjust both A3A1C15 OUTPUT MATCH and A3A1C3 OSC PEAK for maximum peak-to-peak voltage on the oscilloscope display.

11.Reconnect the BNC cable through the 20 dB attenuator to the frequency counter input. The comb generator frequency must be

100.000000 MHz ±0.00004 MHz.

12.Repeat step 8 to step 11 until the frequency is within speciﬁcation.

13.Perform the following steps only if the comb generator frequency cannot be brought within tolerance with the output power peaked.

• Set the

LINE switch to OFF and remove the power cord. Remove

the A3A1 comb generator cover plate.

• Change the selected value of A3A1L3 to obtain an output

frequency of 100.000500 MHz ±0.004 MHz with A3A1C5 FREQ centered.

Increasing the value of A3A1L3 increases the output frequency of the comb generator. The frequency of the oscillator decreases about 500 Hz when the cover plate is installed. Refer to

Figure 2-26 for component location.

Figure 2-26 Comb Generator Component Location

94 Chapter2

Making Adjustments

14. Comb Generator

• Each time the value of A3A1L3 is changed, reconnect the power cord, set the

LINE switch to ON, and adjust A3A1C3 OSC PEAK

for maximum signal. The output frequency changes when A3A1C3 OSC PEAK is adjusted. Reinstall the comb generator cover plate and repeat step 8 to step 12.

Output Power

14.Zero and calibrate the power sensor/measuring receiver combination in log mode (power reads out in dBm). Enter the power sensor

0.1 GHz cal factor into the measuring receiver.

15.Connect the power sensor to the output of the 20 dB attenuator using an adapter.

16.Adjust A3A1C15 OUTPUT MATCH for maximum power output. The measuring receiver should measure +6 dBm ±0.8 dB.

17.If the output power of the comb generator is out of tolerance, perform the following:

• Set the

LINE switch to OFF, remove the power cord, and remove

the A3A1 comb generator cover plate.

• Change the selected value of A3A1R6 to obtain an output power

reading of +6.0 dBm ±0.8 dB. Increasing the value of A3A1R6 decreases the output power of the comb generator, while decreasing the value increases the output power. Refer to Figure

2-26 for component location.

• Each time the value of A3A1R6 is changed, reconnect the power

cord, set the

LINE switch to ON, and adjust A3A1C16 OUTPUT

MATCH for maximum power out.

18.Reinstall the comb generator assembly cover plate and all the screws. Connect a BNC cable from the 20 dB attenuator to the frequency counter input using adapters.

19.Adjust A3A1C5 FREQ for a frequency counter reading of

100.000000 MHz ±0.000010 MHz (tolerance of ±10 Hz).

20.Set the

LINE switch to OFF and reconnect W24 to A3A1J1.

21.Reinstall A3A1 comb generator assembly into RF Section. Refer to the A3A1 comb generator assembly replacement procedure.

22.Reinstall the front-end assembly in the analyzer. Refer to the “Front-End Assembly” replacement procedure.

Chapter 2 95

Making Adjustments

15. Frequency Response of the 8590L, 8591C, and 8591E

This adjustment applies to:

8590L spectrum analyzers 8591E spectrum analyzers 8591C cable TV analyzers

The frequency response (ﬂatness) of the analyzer is measured with the corrections off. The source is adjusted to place the displayed signal at the analyzer center horizontal graticule line.

The ﬂatness data is then entered into the analyzer using the

CAL functions. The error corrections are stored in battery backed RAM

on the A16 processor/video assembly. For analyzers equipped with 75 Ω inputs, the 50 Ω system is

characterized before starting the “Frequency Response” adjustment procedure.

SERVICE

Equipment Required

Synthesized sweeper Measuring receiver (used as a power meter) Frequency synthesizer Power sensor, 1 MHz to 1.8 GHz Power splitter Adapter, Type N (f) to APC 3.5 (m) Adapter, Type N (m) to Type N (m) Cable, BNC, 122 cm (48 in.) Cable, Type N, 183 cm (72 in.)

Additional Equipment for 75 Ω Inputs

Power meter Power sensor, 75 Ω Cable, BNC, 120 cm (48 in) 75 Ω Adapter, Type N (f) 75 Ω to Type N (m) 50 Ω Adapter, Type N (m) to BNC (m), 75 Ω

96 Chapter2

15. Frequency Response of the 8590L, 8591C, and 8591E

Procedure for System Characterization (75 Ω input)

1. Zero and calibrate the measuring receiver and 1 MHz to 1.8 GHz power sensor as described in the measuring receiver operation manual.

2. Zero and calibrate the power meter and the 75 Ω power sensor as described in the power meter operation manual.

3. Press INSTRUMENT PRESET on the synthesized sweeper. Set the synthesized sweeper controls as follows:

CW .................................................................. 41 MHz

FREQ STEP ................................................... 37MHz

POWER LEVEL ............................................... 5dBm

4. Connect the equipment as shown in Figure 2-27.

Figure 2-27 System Characterization Test Setup for 75 Ω inputs

Making Adjustments

CAUTION Use only 75 Ω cables, connectors, or adapters on instruments equipped

with 75 Ω inputs or damage to the input connectors will occur.

5. Adjust the synthesized sweeper POWER LEVEL for a 0 dBm reading on the measuring receiver.

6. Record the power meter reading in Column 4 of Table 2-6, taking into account the cal factors of both power sensors.

Chapter 2 97

Making Adjustments

15. Frequency Response of the 8590L, 8591C, and 8591E

7. On the synthesized sweeper, press CW and STEP UP, to step through the remaining frequencies listed in Table 2-6.

At each new frequency repeat step 5 and step 6, and enter each power sensor cal factor into the respective power meter.

Procedure

1. Zero and calibrate the measuring receiver and 1 MHz to 1.8 GHz power sensor in log mode as described in the measuring receiver operation manual.

2. Connect the equipment as shown in Figure 2-28.

Figure 2-28 Frequency Response Setup

3. Press INSTRUMENT PRESET on the synthesized sweeper. Set the synthesized sweeper controls as follows:

CW ................................................................ 300 MHz

FREQ STEP ................................................... 37MHz

POWER LEVEL ............................................. −9dBm

98 Chapter2

15. Frequency Response of the 8590L, 8591C, and 8591E

4. On the analyzer, press the following keys.

PRESET CAL, More 1 of 4 CORRECT ON OFF (OFF) FREQUENCY, 300, MHz CF STEP AUTO MAN, 37, MHz SPAN, 12, MHz

75 Ω input: press AMPLITUDE, More 1 of 2, AMPTD UNITS, dBm

AMPLITUDE, 10, −dBm SCALE LOG LIN (LOG), 1, dB BW, 1, MHz PEAK SEARCH

Making Adjustments

MKR FCTN, MK TRACK ON OFF (ON)

5. Adjust the synthesized sweeper POWER LEVEL for a MKR-TRK amplitude reading of −14 dBm ±0.1 dB.

6. Press RATIO mode on the measuring receiver.

7. Press the following analyzer keys.

FREQUENCY, 41, MHz

8. Set the synthesized sweeper CW to 41 MHz.

9. Adjust the synthesized sweeper POWER LEVEL for an analyzer MKR-TRK amplitude reading of −14 dBm ±0.1 dB.

10.Record the power ratio here and in Column 2 of Table 2-6 for 41 MHz.

Measuring Receiver Reading at 41 MHz____________________dB

11.Press the following analyzer keys.

FREQUENCY, 78, MHz

12.Set the synthesized sweeper CW to 78 MHz.

13.Adjust the synthesized sweeper POWER LEVEL for an analyzer MKR-TRK amplitude reading of −14 dBm ±0.1 dB.

14.Record the power ratio displayed on the measuring receiver in Column 2 of Table 2-6 for 78 MHz.

Chapter 2 99

Making Adjustments

15. Frequency Response of the 8590L, 8591C, and 8591E

15.On the analyzer, press FREQUENCY and ⇑ (step up), to step through the remaining frequencies listed in Column 1 of Table 2-6. At each new frequency repeat step 13 to step 15, entering the power sensor Cal Factor into the measuring receiver as indicated in Column 3 of

Table 2-6.

16.On the synthesized sweeper, press CW and STEP UP.

Frequency Response Error At 4 MHz

17.Using a cable, connect the frequency synthesizer directly to the INPUT 50Ω. See Figure 2-29. For 75 Ω inputs use a 75 Ω cable to connect the frequency synthesizer 75Ω OUTPUT to the INPUT 75Ω of the analyzer. Set the frequency synthesizer 50–75 Ω switch to the 75 Ω position. See Figure 2-29.

Figure 2-29 Frequency Response for 4 MHz Setup

CAUTION Use only 75 Ω cables, connectors, or adapters on instruments equipped

with 75 Ω inputs or damage to the input connectors will occur.

100 Chapter2

HP 8590 schematic

Specifications and Main Features

Frequently Asked Questions

User Manual

1 Introduction

The 8590 Series Analyzers Assembly-Level Repair Service Guide

Service Guide Organization

Analyzer Description

Firmware Revision Date

Firmware Upgrade Kit Ordering Information

Reliability Considerations

Analyzer Input Protection

Adjustment Procedures

Safety

Test Equipment You Will Need

When A 3335A Source Is Not Available

If There Are Abnormal Indications During Adjustment

Periodically Verifying Calibration

Standard-Value Replacement Components

If You Replace or Repair an Assembly

2 Making Adjustments

Before You Start

Procedure

Equipment Required

Procedures

2. Sampler Match

Equipment Required

Procedure

3. 10 MHz Reference

Equipment Required

Procedure

4. 10 MHz Precision Frequency Reference

Equipment Required

Procedure

5. Crystal and LC Bandwidth Filter

Equipment Required

Procedure

6. Cal Attenuator Error

Equipment Required

Additional Equipment for Option 026

Procedure

Equipment Required

Procedure

8. CAL FREQ Adjustment Routine

Equipment Required

Additional Equipment for Option 026

Procedure

9. CAL AMPTD Adjustment Routine

Equipment

Additional Equipment for Option 026

Procedure

10. CAL YTF Adjustment Routine

Equipment Required

Additional Equipment for Option 026

Procedure

Mixer Bias DAC Initialization

11. CAL MXR Adjustment Routine

Equipment Required

Additional Equipment for Option 026

Procedure

12. Second Converter

Equipment Required

Procedure

13. Third Converter and Second IF Bandpass

Equipment Required

Procedure

14. Comb Generator

Equipment Required

Procedure

Equipment Required

Procedure for System Characterization (75 Ω input)

Procedure