Tektronix 3026 Service Manual

Service Manual

3026 3 GHz Real Time Spectrum Analyzer

071-0420-00

Warning

The servicing instructions are for use by qualified personnel only. To avoid personal injury, do not perform any servicing unless you are qualified to do so. Refer to the Safety Summary prior to performing service.

Copyright E Sony/T ektronix Corporation. All rights reserved. Copyright E Tektronix, Inc. All rights reserved. T ektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supercedes

that in all previously published material. Specifications and price change privileges reserved. Printed in Japan. Sony/T ektronix Corporation, P.O.Box 5209, Tokyo Int’l, T okyo 100–31 Japan T ektronix, Inc., P.O. Box 1000, Wilsonville, OR 97070–1000 TEKTRONIX and TEK are registered trademarks of T ektronix, Inc.

WARRANTY

T ektronix warrants that the products that it manufactures and sells will be free from defects in materials and workmanship for a period of one (1) year from the date of shipment. If a product proves defective during this warranty period, T ektronix, at its option, either will repair the defective product without charge for parts and labor, or will provide a replacement in exchange for the defective product.

In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration of the warranty period and make suitable arrangements for the performance of service. Customer shall be responsible for packaging and shipping the defective product to the service center designated by T ektronix, with shipping charges prepaid. Tektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the T ektronix service center is located. Customer shall be responsible for paying all shipping charges, duties, taxes, and any other charges for products returned to any other locations.

This warranty shall not apply to any defect, failure or damage caused by improper use or improper or inadequate maintenance and care. T ektronix shall not be obligated to furnish service under this warranty a) to repair damage resulting from attempts by personnel other than T ektronix representatives to install, repair or service the product; b) to repair damage resulting from improper use or connection to incompatible equipment; c) to repair any damage or malfunction caused by the use of non-T ektronix supplies; or d) to service a product that has been modified or integrated with other products when the effect of such modification or integration increases the time or difficulty of servicing the product.

THIS WARRANTY IS GIVEN BY TEKTRONIX IN LIEU OF ANY OTHER WARRANTIES, EXPRESS OR IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. TEKTRONIX’ RESPONSIBILITY TO REP AIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY. TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT , SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.

Specifications

Operating Information

General Safety Summary xi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Service Safety Summary xiii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Preface xv. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Introduction xix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Product Overview 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Specifications 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

W arranted Characteristics 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

T ypical Characteristics 1–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Nominal Traits 1–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Certification and Compliances 1–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Installation 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Supplying Operating Power 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating Environment 2–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Applying and Interrupting Power 2–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Repackaging Instructions 2–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Installed Options 2–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating Instructions 2–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Preparations 2–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Setup 2–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Turning On the Power 2–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Observing Spectrum 2–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Dividing the Display Area and Changing the Display Mode 2–12. . . . . . . . . . . . . . .

Using the Block Mode to Acquire Data 2–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Using Dual Markers 2–17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Trigger and Mask Pattern 2–20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Changing the Display Frame 2–24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Shutting Power Off 2–26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Theory of Operation

Theory of Operation 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Module Overview 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Performance Verification

Performance Verification 4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Conventions 4–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Self Tests 4–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Calibration 4–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Performance T ests 4–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Prerequisites 4–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Equipment Required 4–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

10 MHz Reference Output T est 4–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

10 MHz Reference Input T est 4–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Center Frequency Accuracy T est 4–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Flatness and Aliasing T est 4–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Attenuator T est 4–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Span and Center Frequency T est 4–20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Frame Update Interval T est 4–23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Internal Trigger Test 4–26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

External Trigger Test 4–30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

C/N T est 4–32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

RF Reference Level T est 4–34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

RF Flatness T est 4–38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

T est Record 4–41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Adjustment Procedures

Maintenance

Adjustment Procedures 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Requirements for Adjustments 5–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Equipment Required 5–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Adjustments 5–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Maintenance 6–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Related Maintenance Procedures 6–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Preparation 6–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Inspection and Cleaning 6–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Removal and Installation Procedures 6–9. . . . . . . . . . . . . . . . . . . . . . . . . .

Preparation 6–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Access Procedure 6–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Procedures for External Modules 6 –19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Procedures for Internal Modules 6–30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Procedures for Board Modules 6–38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Procedures for Power Supply Modules 6–48. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Procedures for Rear Panel Modules 6–55. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Troubleshooting 6–59. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Troubleshooting Procedure 6–59. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Diagnostics 6–60. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Symptoms and Faulty Modules 6–78. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Accessing the BIOS 6–81. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Preparation 6–82. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Setting the BIOS Parameters 6–83. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Backing Up the System Files 6–89. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3026 3 GHz Real Time Spectrum Analyzer Service Manual

Options

Electrical Parts List

Diagrams

Mechanical Parts List

Table of Contents

Options and Accessories 7–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Options 7–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Standard Accessories 7–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Optional Accessories 7–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Electrical Parts List 8–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Diagrams 9–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Mechanical Parts List 10–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Parts Ordering Information 10–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Using the Replaceable Parts List 10–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Table of Contents

List of Figures

Figure 2–1: Power switch 2–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 2–2: RF INPUT connector 2–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 2–3: System information 2–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 2–4: Initial screen 2–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 2–5: START/STOP button 2–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 2–6: Typical spectrum display (16 MHz center frequency

and 10 MHz span) 2–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 2–7: Buttons in DISPLAY area 2–12. . . . . . . . . . . . . . . . . . . . . . . . .

Figure 2–8: Spectrogram display (upper) and spectrum display

(lower) 2–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 2–9: SELECT button 2–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 2–10: Waterfall display and spectrum display 2–14. . . . . . . . . . . . .

Figure 2–11: ROLL BLOCK button 2–15. . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 2–12: Data acquisition in the Block mode 2–16. . . . . . . . . . . . . . . . .

Figure 2–13: Displaying dual markers 2–17. . . . . . . . . . . . . . . . . . . . . . . . .

Figure 2–14: MARKER TOGGLE button 2–18. . . . . . . . . . . . . . . . . . . . . .

Figure 2–15: Measurement of frequency difference with dual

markers 2–19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 2–16: Creation of trigger region 2–21. . . . . . . . . . . . . . . . . . . . . . . .

Figure 2–17: Created trigger mask (blue region) 2–22. . . . . . . . . . . . . . . . .

Figure 2–18: Waveform display before triggering 2–23. . . . . . . . . . . . . . . .

Figure 2–19: Frame in which trigger occurred 2–25. . . . . . . . . . . . . . . . . .

Figure 4–1: Display of the self test results 4–3. . . . . . . . . . . . . . . . . . . . . . .

Figure 4–2: CAL NEED indication in status indication area 4–5. . . . . . .

Figure 4–3: Initial test hookup 4–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 4–4: Initial test hookup 4–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 4–5: Modified test hookup 4–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 4–6: Initial test hookup 4–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 4–7: Initial test hookup 4–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 4–8: Initial test hookup 4–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 4–9: Initial test hookup 4–20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 4–10: Initial test hookup 4–23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 4–11: Initial test hookup 4–26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 4–12: Creating a trigger mask 4–27. . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 4–13: Initial test hookup 4–30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Table of Contents

Figure 4–14: Initial test hookup 4–32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 4–15: Initial hookup for setting up the power meter and

sensor 4–34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 4–16: Hookup for calibrating the power sensor 4–35. . . . . . . . . . . .

Figure 4–17: Hookup for setting the signal generator 4–36. . . . . . . . . . . . .

Figure 4–18: Hookup for checking the reference level accuracy 4–36. . . .

Figure 4–19: Initial test hookup 4–38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 4–20: Running the RF flatness check program on PC 4–39. . . . . .

Figure 5–1: Accessing the A5 Baseband board 5–5. . . . . . . . . . . . . . . . . . .

Figure 5–2: Adjustment and connector location 5–6. . . . . . . . . . . . . . . . .

Figure 5–3: Test hookup 5–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 5–4: Initial test hookup 5–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 5–5: Loading the adjustment file from the floppy disk 5–9. . . . . .

Figure 5–6: Calibration & Set Constant menu 5–10. . . . . . . . . . . . . . . . . . .

Figure 5–7: Initial hookup for setting up the power meter and

sensor 5–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 5–8: Hookup for calibrating the power sensor 5–12. . . . . . . . . . . . .

Figure 5–9: Test hookup 5–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 5–10: Initial hookup for setting up the power meter and

sensor 5–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 5–11: Hookup for calibrating the power sensor 5–15. . . . . . . . . . . .

Figure 5–12: Test hookup 5–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 5–13: Running the SG flatness measurement program on

PC 5–17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 5–14: Label location 5–19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 5–15: Serial number entry 5–20. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 5–16: Test hookup 5–21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–1: 3026 orientation 6–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–2: Guide to removal procedures 6–13. . . . . . . . . . . . . . . . . . . . . . .

Figure 6–3: External modules 6–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–4: Internal modules 6–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–5: Board modules 6–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–6: Power supply modules 6–17. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–7: Rear panel modules 6–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–8: Front-panel knob removal 6–20. . . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–9: Line cord removal 6–21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–10: Rear cover and cabinet removal 6–23. . . . . . . . . . . . . . . . . . .

Figure 6–11: Trim ring and menu buttons removal 6–25. . . . . . . . . . . . . . .

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Figure 6–12: Front-panel assembly removal 6–26. . . . . . . . . . . . . . . . . . . .

Figure 6–13: Disassembly of front-panel assembly 6–27. . . . . . . . . . . . . . .

Figure 6–14: Front-panel connectors removal 6–29. . . . . . . . . . . . . . . . . . .

Figure 6–15: Opening the top chassis 6–31. . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–16: Fan and fan frame removal 6–32. . . . . . . . . . . . . . . . . . . . . . .

Figure 6–17: Floppy disk drive removal 6–33. . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–18: Opening the down-converter chassis 6–34. . . . . . . . . . . . . . .

Figure 6–19: Hard disk drive and solid state disk removal 6–35. . . . . . . . .

Figure 6–20: Display module removal 6–37. . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–21: Board retainer and shield cover removal 6–39. . . . . . . . . . . .

Figure 6–22: Daughter boards removal 6–42. . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–23: A1 Mother board removal – Top side 6–44. . . . . . . . . . . . . . .

Figure 6–24: A1 Mother board removal – Bottom side 6–45. . . . . . . . . . . .

Figure 6–25: Down-converter and A5 Baseband board removal 6–47. . . .

Figure 6–26: A13 Filter board removal 6–49. . . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–27: A11 and A12 DC Power boards removal 6–51. . . . . . . . . . . .

Figure 6–28: A10 Sub Power board and Power Supply removal 6–53. . . .

Figure 6–29: Power supply removal 6–54. . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–30: Rear panel modules removal 6–57. . . . . . . . . . . . . . . . . . . . . .

Figure 6–31: Rear BNC cable assembly removal 6–58. . . . . . . . . . . . . . . . .

Figure 6–32: Troubleshooting procedure 1 — Power supply

modules 6–61. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–33: Troubleshooting procedure 2 — Signal processing

modules 6–64. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–34: Troubleshooting procedure 3 — Clock modules 6–66. . . . . .

Figure 6–35: Troubleshooting procedure 4 — LCD display modules 6–68

Figure 6–36: Troubleshooting procedure 5 — CPU modules 6–69. . . . . . .

Figure 6–37: Troubleshooting procedure 6 — Front panel modules 6–70.

Figure 6–38: Location of the A11 and A12 DC Power boards 6–71. . . . . .

Figure 6–39: Location of the A5 Baseband and A13 Filter board 6–72. . .

Figure 6–40: Location of the A6 FFT board 6–73. . . . . . . . . . . . . . . . . . . . .

Figure 6–41: Location of the A7 DDC board 6–74. . . . . . . . . . . . . . . . . . . .

Figure 6–42: Location of the A8 Memory board 6–75. . . . . . . . . . . . . . . . .

Figure 6–43: U100 down-converter location 6–76. . . . . . . . . . . . . . . . . . . . .

Figure 6–44: LCD wire location 6–77. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–45: Connecting the keyboard 6–82. . . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–46: BIOS SETUP screen 6–83. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 6–47: STANDARD CMOS SETUP screen 6–84. . . . . . . . . . . . . . . .

Figure 6–48: BIOS FEATURES SETUP screen 6–85. . . . . . . . . . . . . . . . . .

3026 3 GHz Real Time Spectrum Analyzer Service Manual

Table of Contents

Figure 9–1: Block diagram 9–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 9–2: Interconnect diagram 9–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 10–1: External modules 10–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 10–2: Front panel modules 10–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 10–3: Internal modules 10–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 10–4: Power supply modules 10–11. . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 10–5: Board modules – 110–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 10–6: Board modules – 210–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 10–7: Cables 10–17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3026 3 GHz Real Time Spectrum Analyzer Service Manual

vii

Table of Contents

List of Tables

Table 1–1: Warranted characteristics — Frequency 1–4. . . . . . . . . . . . .

Table 1–2: Warranted characteristics — Amplitude 1–4. . . . . . . . . . . . .

Table 1–3: Warranted characteristics — Realtime span 1–5. . . . . . . . . .

Table 1–4: Warranted characteristics — Trigger/Acquisition 1–5. . . . .

Table 1–5: Warranted characteristics — Installation requirements 1–6

Table 1–6: Warranted characteristics — Environmental 1–6. . . . . . . . .

Table 1–7: T ypical characteristics — Amplitude 1–7. . . . . . . . . . . . . . . .

Table 1–8: T ypical characteristics — Filter 1–7. . . . . . . . . . . . . . . . . . . .

Table 1–9: T ypical characteristics — Trigger/Acquisition 1–7. . . . . . . .

Table 1–10: T ypical characteristics — Installation requirements 1–7. .

Table 1–11: Nominal traits — Frequency 1–9. . . . . . . . . . . . . . . . . . . . . .

Table 1–12: Nominal traits — Amplitude 1–9. . . . . . . . . . . . . . . . . . . . . .

Table 1–13: Nominal traits — FFT 1–10. . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 1–14: Nominal traits — Filter 1–11. . . . . . . . . . . . . . . . . . . . . . . . . .

Table 1–15: Nominal traits — Trigger/Acquisition 1–11. . . . . . . . . . . . . .

Table 1–16: Nominal traits — System control 1–12. . . . . . . . . . . . . . . . . .

Table 1–17: Nominal traits — AC line power 1–12. . . . . . . . . . . . . . . . . . .

Table 1–18: Nominal traits — Mechanical 1–12. . . . . . . . . . . . . . . . . . . . .

Table 1–19: Certifications and compliances 1–13. . . . . . . . . . . . . . . . . . . . .

viii

Table 2–1: Power-cord conductor identification 2–2. . . . . . . . . . . . . . . . .

Table 2–2: Power cord identification 2–2. . . . . . . . . . . . . . . . . . . . . . . . . .

Table 4–1: Performance tests 4–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 4–2: Test equipment 4–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 4–3: Level accuracy 4–19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 4–4: The instrument settings for the span and center

frequency test 4–21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 4–5: The instrument settings for the RF reference level test 4–37. .

Table 5–1: Adjustments 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 5–2: Test equipment 5–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 6–1: Relative susceptibility to static-discharge damage 6–3. . . . . .

Table 6–2: External inspection check list 6–5. . . . . . . . . . . . . . . . . . . . . . .

Table 6–3: Internal inspection check list 6–6. . . . . . . . . . . . . . . . . . . . . . .

3026 3 GHz Real Time Spectrum Analyzer Service Manual

Table of Contents

Table 6–4: Summary of procedures 6–10. . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 6–5: Tools required for module removal 6–11. . . . . . . . . . . . . . . . . .

Table 6–6: Normal supply voltage 6–72. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 6–7: Symptoms and faulty modules 6–78. . . . . . . . . . . . . . . . . . . . . .

Table 6–8: 3026 system files 6–89. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 7–1: Options 7–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 7–2: Standard accessories 7–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 7–3: Optional accessories 7–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3026 3 GHz Real Time Spectrum Analyzer Service Manual

Table of Contents

3026 3 GHz Real Time Spectrum Analyzer Service Manual

General Safety Summary

Review the following safety precautions to avoid injury and prevent damage to this product or any products connected to it. To avoid potential hazards, use this product only as specified.

Only qualified personnel should perform service procedures.

To Avoid Fire or Personal Injury

Use Proper Power Cord. Use only the power cord specified for this product and

certified for the country of use. Use Proper Voltage Setting. Before applying power, ensure that the line selector is

in the proper position for the power source being used. Connect and Disconnect Properly. Do not connect or disconnect probes or test

leads while they are connected to a voltage source. Ground the Product. This product is grounded through the grounding conductor

of the power cord. To avoid electric shock, the grounding conductor must be connected to earth ground. Before making connections to the input or output terminals of the product, ensure that the product is properly grounded.

Observe All Terminal Ratings. To avoid fire or shock hazard, observe all ratings and markings on the product. Consult the product manual for further ratings information before making connections to the product.

The common terminal is at ground potential. Do not connect the common terminal to elevated voltages.

Do not apply a potential to any terminal, including the common terminal, that exceeds the maximum rating of that terminal.

Do Not Operate Without Covers. Do not operate this product with covers or panels removed.

Use Proper Fuse. Use only the fuse type and rating specified for this product. Avoid Exposed Circuitry. Do not touch exposed connections and components

when power is present. Do Not Operate With Suspected Failures. If you suspect there is damage to this

product, have it inspected by qualified service personnel.

Do Not Operate in Wet/Damp Conditions.

Do Not Operate in an Explosive Atmosphere.

Keep Product Surfaces Clean and Dry. Provide Proper Ventilation. Refer to the manual’s installation instructions for

details on installing the product so it has proper ventilation.

3026 3 GHz Real Time Spectrum Analyzer Service Manual

General Safety Summary

Symbols and Terms

Terms in this Manual. These terms may appear in this manual:

WARNING. Warning statements identify conditions or practices that could result in injury or loss of life.

CAUTION. Caution statements identify conditions or practices that could result in damage to this product or other property.

Terms on the Product. These terms may appear on the product: DANGER indicates an injury hazard immediately accessible as you read the

marking. WARNING indicates an injury hazard not immediately accessible as you read the

marking. CAUTION indicates a hazard to property including the product. Symbols on the Product. The following symbols may appear on the product:

WARNING

High Voltage

Protective Ground

(Earth) Terminal

CAUTION

Refer to Manual

Double

Insulated

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3026 3 GHz Real Time Spectrum Analyzer Service Manual

Service Safety Summary

Only qualified personnel should perform service procedures. Read this Service Safety Summary and the General Safety Summary before performing any service

procedures. Do Not Service Alone. Do not perform internal service or adjustments of this

product unless another person capable of rendering first aid and resuscitation is present.

Disconnect Power. To avoid electric shock, disconnect the mains power by means of the power cord or, if provided, the power switch.

Use Care When Servicing With Power On. Dangerous voltages or currents may exist in this product. Disconnect power, remove battery (if applicable), and disconnect test leads before removing protective panels, soldering, or replacing components.

To avoid electric shock, do not touch exposed connections.

3026 3 GHz Real Time Spectrum Analyzer Service Manual

xiii

Service Safety Summary

xiv

3026 3 GHz Real Time Spectrum Analyzer Service Manual

Preface

Manual Structure

This is the service manual for the 3026 Real Time Spectrum Analyzer. The manual contains information needed to service the analyzer to the module level.

This manual is divided into sections, such as Specifications and Theory of

Operation. Further, some sections are divided into subsections, such as Product Description and Removal and Installation Procedures.

Sections containing procedures also contain introductions to those procedures. Be sure to read these introductions because they provide information needed to do the service correctly and efficiently. The following contains a brief description of each manual section.

Specifications contains a description of the analyzer and the characteristics that apply to it.

Operating Information includes general information and operating instructions.

Theory of Operation contains circuit descriptions that support service to the module level.

Performance Verification contains procedures for confirming that the analyzer functions properly and meets warranted limits.

Adjustment Procedures contains a collection of procedures for adjusting the analyzer to meet warranted limits.

Maintenance contains information and procedures for performing preventive and corrective maintenance of the analyzer. These instructions include cleaning, module removal and installation, and fault isolation to the module.

Options contains information on servicing factory-installed options.

Electrical Parts List contains a statement referring you to Mechanical Parts List, where both electrical and mechanical modules are listed.

Diagrams contains an block diagram and an interconnection diagram.

Mechanical Parts List includes a table of all replaceable modules, their descriptions, and their Tektronix part numbers.

3026 3 GHz Real Time Spectrum Analyzer Service Manual

Preface

Manual Conventions

This manual uses certain conventions that you should become familiar with. Some sections of the manual contain procedures for you to perform. To keep

those instructions clear and consistent, this manual uses the following conventions:

Names of front panel controls and menus appear in the same case (initial

capitals, all uppercase, etc.) in the manual as is used on the analyzer front

panel and menus. Front panel names are all upper-case letters; for example,

DISPLAY, MEASURE, SETUP etc.

Instruction steps are numbered unless there is only one step.

Modules

Safety

Throughout this manual, any replaceable component, assembly, or part of the analyzer is referred to generically as a module. In general, a module is an assembly (like a circuit board), rather than a component (like a resistor or an integrated circuit). Sometimes a single component is a module; for example, the chassis of the analyzer is a module.

Symbols and terms related to safety appear in the Safety Summary near the beginning of this manual.

Finding Other Information

Other documentation for the 3026 includes:

The 3026 Real Time Spectrum Analyzer User Manual contains a tutorial to

quickly describe how to operate the analyzer. It also includes an in-depth

discussion on how to more completely use the analyzer features.

The 3026 Real Time Spectrum Analyzer Programmer Manual explains how

to use the GPIB and LAN interfaces to remotely control the analyzer.

xvi

3026 3 GHz Real Time Spectrum Analyzer Service Manual

Contacting Tektronix

Preface

Product

Support

Service

Support

For other

information

To write us

Website

For application-oriented questions about a Tektronix measurement product, call toll free in North America: 1-800-TEK-WIDE (1-800-835-9433 ext. 2400) 6:00 a.m. – 5:00 p.m. Pacific time

Or contact us by e-mail: tm_app_supp@tek.com

For product support outside of North America, contact your local Tektronix distributor or sales office.

Tektronix offers extended warranty and calibration programs as options on many products. Contact your local Tektronix distributor or sales office.

For a listing of worldwide service locations, visit our web site. In North America:

1-800-TEK-WIDE (1-800-835-9433) An operator will direct your call.

Tektronix, Inc. P.O. Box 1000 Wilsonville, OR 97070-1000 USA

Tektronix.com

3026 3 GHz Real Time Spectrum Analyzer Service Manual

xvii

Preface

xviii

3026 3 GHz Real Time Spectrum Analyzer Service Manual

Introduction

This manual contains information needed to properly service the 3026 Real Time Spectrum Analyzer as well as general information critical to safe and effective servicing.

To prevent personal injury or damage to the analyzer, consider the following before attempting service:

The procedures in this manual should be performed only by a qualified service person .

Read the General Safety Summary and the Service Safety Summary, beginning on page xi.

Read Preparation for Use in section 2, Operating Information.

When using this manual for servicing, be sure to follow all warnings, cautions, and notes.

Performance Check Interval

Strategy for Servicing

Generally, the performance check described in section 4, Performance Verification, should be done every 12 months. In addition, performance check is

recommended after module replacement. If the analyzer does not meet performance criteria, repair is necessary.

Throughout this manual, the term, module, refers to any field-replaceable component, assembly, or part of the analyzer.

This manual contains all the information needed for periodic maintenance of the analyzer (Examples of such information are procedures for checking performance).

Further, it contains all information for corrective maintenance down to the module level. To isolate a failure to a module, use the fault isolation procedures found in Troubleshooting, part of section 6, Maintenance. To remove and replace any failed module, follow the instructions in Removal and Installation Proce- dures, also part of section 6. After isolating a faulty module, replace it with a fully-tested module obtained from the factory. Section 10, Mechanical Parts List, contains part number and ordering information for all replaceable modules.

3026 3 GHz Real Time Spectrum Analyzer Service Manual

xix

Preface

3026 3 GHz Real Time Spectrum Analyzer Service Manual

Specifications

Product Overview

The 3026 is a portable real time 3 GHz spectrum analyzer with real-time frequency analysis functions.

The incorporated 3 GHz down converter enables you to perform spectrum analysis, time domain analysis, and analog modulation analysis of Radio Frequency (RF) signals without connecting any external devices.

The 3026, with the adoption of new architecture, can acquire time and frequency domain data simultaneously. It can also accurately capture various kinds of signals with a wide variety of triggering functions.

Real-time trigger functions in frequency domain allow you to trigger on instantaneous events such as the starting point of a burst signal.

Using the trigger functions in time domain, triggering is available on impulse noises which are barely captured in frequency domain.

In addition, the 3026 provides measurement functions that can evaluate the performance of radio devices with simple operation. Moreover, four types of data display functions offered in the system can allow you to analyze the acquired data more precisely.

Features

The 3026 has the following features:

Measurement frequency range: 50 Hz to 3 GHz

Measurement span: 100 Hz to 3 GHz

Complete real time frequency analysis

Concurrent processing of real time frequency analysis and analog modulation analysis

Provides comprehensive measurement functions to evaluate radio devices such as occupied bandwidth (OBW), adjacent channel leakage power (ACP) and power consumption.

Four types of data display:

Spectrum display

Spectrogram display

Waterfall display

Analog demodulation display (AM, PM, FM, and FSK)

3026 3 GHz Real Time Spectrum Analyzer Service Manual

1–1

Specifications

A range of trigger functions:

Mask pattern trigger

Level trigger

External trigger

Simultaneous data acquisition in frequency domain and time domain

6.5 inch full-color TFT display

Equipped with a hard disk drive and a 3.5 inch floppy disk drive

A selection of interface ports:

GPIB port

10 BASE-T port

VGA output port

Targets

Printer port

The 3026 can perform complete real time analysis for the following:

Analog modulation analysis (AM, PM, FM, and FSK)

Variation analysis in PLL frequency:

Jitter in reference oscillator of a mobile telephone, localization of a radio set,

HD read-out jitter, etc.

Analysis of momentary noise: Mixed noise, EMI measurement, etc.

Multi-path measurement: Measurement of electric wave environment

Electric wave interference: Radar interference

Electric wave analysis: Burst signals

1–2

3026 3 GHz Real Time Spectrum Analyzer Service Manual

Specifications

The specifications on the 3026 Real Time Spectrum Analyzer can be classified into three sub-sections: Warranted Characteristics, Typical Characteristics and Nominal Traits. Certifications and Compliances are also found at the last page in this section.

Warranted Characteristics

This section lists the various warranted characteristics that describe the 3026 Real Time Spectrum Analyzer. Electrical and environmental characteristics are also included.

Warranted characteristics are described in terms of quantifiable performance limits which are warranted.

As stated above, this section lists only warranted characteristics. A list of typical characteristics starts on page 1–7.

Performance Conditions

The performance limits in this specification are valid with these conditions:

The analyzer must have been calibrated/adjusted at an ambient temperature

between +20

The analyzer must be in an environment with temperature, altitude, humidity, and vibration within the operating limits described in these specifications.

The analyzer must have had a warm-up period of at least 20 minutes.

The analyzer must be operating at an ambient temperature between +10 and +40

C and +30_ C.

3026 3 GHz Real Time Spectrum Analyzer Service Manual

1–3

Specifications

Table 1–1: Warranted characteristics — Frequency

Characteristics Description PV reference page

Center frequency setting characteristic 0.1 Hz step

Spectrum purity –100 dBc/Hz (10 kHz offset) 4–32

Table 1–2: Warranted characteristics — Amplitude

Characteristics Description PV reference page

Reference level range

RF mode –50 dBm to +30 dBm

BASEBAND mode –30 dBm to +30 dBm

Maximum nondestructive input voltage +30 dBm

Internal gain calibration accuracy

Flatness

2-nd harmonic distortion

3-rd order distortion

Residual response

Image suppress

1.0 dB (at 25 MHz) 4–34

2.0 dB (>500 Hz), +2.0 dB and –5.0 dB (v500 Hz) 4–16, 4–38

–70 dBc (–10 dBfs input level)

–60 dBc (t20 MHz and v–10 dBfs input level)

–70 dBc (w20 MHz and v–10 dBfs input level)

–40 dBfs (vDC +10 bins)

–65 dBfs (center "2 bins)

–70 dBfs (other than above)

–70 dB

1–4

3026 3 GHz Real Time Spectrum Analyzer Service Manual

Specifications

Table 1–3: Warranted characteristics — Realtime span

Characteristics Description PV reference page

Minimum spectral frame update interval 4–23

1024-point analysis 160ms (500 kHz to 5 MHz span)

400ms (50 kHz to 200 kHz span) 4 ms (5 kHz to 20 kHz span) 40 ms (500 Hz to 2 kHz span) 100 ms (200 Hz span) 200 ms (100 Hz span)

256-point analysis 40ms (500 kHz to 2 MHz span)

400ms (50 kHz to 200 MHz span) 4 ms (5 kHz to 20 kHz span) 40 ms (500 Hz to 2 kHz span) 100 ms (200 Hz span) 200 ms (100 Hz span)

Realtime span

2 MHz

Table 1–4: Warranted characteristics — Trigger/Acquisition

Characteristics Description PV reference page

Internal trigger 4–26

Level

Maximum 0 dBfs

Minimum –55 dBfs

Frequency resolution Span/800 (5 MHz span, 1024 points)

Span/640 (v2 MHz span, 1024 points) Span/160 (v2 MHz span, 256 points)

Time resolution Same as the spectral frame update interval.

External trigger 4–30

Input voltage range 0 to 5 V

3026 3 GHz Real Time Spectrum Analyzer Service Manual

1–5

Specifications

Table 1–5: Warranted characteristics — Installation requirements

Characteristics Description

Heat emission

Maximum power 300 W

Maximum line current 4.0 Arms (at 50 Hz)

AC line source

Primary circuit dielectric voltage withstand

Grounding impedance Verify the continuity of grounding connection, by any suitable means, between a

15 s for 1,500 Vrms at 50 Hz

representative part required to be grounding and attachment-plug cap grounding pin. (0.1 W at 30 A)

Table 1–6: Warranted characteristics — Environmental

Characteristics Description

Atmospherics

Temperature

Operating +10 _C to +40 _C

Non-operating –20 _C to +60 _C

Relative humidity

Operating 20 % to 80 % (no condensation), Maximum wet-bulb temperature 29.4 _C

Non-operating 5 % to 90 % (no condensation), Maximum wet-bulb temperature 40.0 _C

Altitude

Operating Up to 4.5 km (15,000 ft).

Non-operating Up to 15 km (50,000 ft)

Dynamics

Random vibration

Operating 0.27 g rms, from 5 Hz to 500 Hz, 10 minutes

Non-operating 2.28 g rms, from 5 Hz to 500 Hz, 10 minutes

Shock

Non-operating 294 m/s2 (3.0G), half-sine, 11 ms duration, three times in every axis direction.

Maximum working temperature decreases by 1 _C at 300 m increments when the altitude exceeds 1.5 km.

1–6

3026 3 GHz Real Time Spectrum Analyzer Service Manual

Typical Characteristics

This subsection contains tables that list the various typical characteristics which describe the 3026 Real Time Spectrum Analyzer.

Typical characteristics are described in terms of typical or average performance. Typical characteristics are not warranted.

Table 1–7: Typical characteristics — Amplitude

Characteristics Description

Input equivalent noise –140 dBm/Hz at 1 GHz

Spurious response

Table 1–8: Typical characteristics — Filter

–65 dBc

Specifications

Characteristics Description

Stopband attenuation 90 dB

Bandpass ripple 0.2 dB

Table 1–9: Typical characteristics — Trigger/Acquisition

Characteristics Description

Roll mode update rate 10 frames/s

Table 1–10: Typical characteristics — Installation requirements

Characteristics Description

Surge current 30 A (at 100 VAC)

15 A (at 200 VAC)

3026 3 GHz Real Time Spectrum Analyzer Service Manual

1–7

Specifications

1–8

3026 3 GHz Real Time Spectrum Analyzer Service Manual

Nominal Traits

This section contains a collection of tables that list the various nominal traits that describe the 3026 Real Time Spectrum Analyzer. Electrical and mechanical traits are included.

Nominal traits are described using simple statements of fact such as “Four, all identical” for the trait “Output Channels, Number of,” rather than in terms of limits that are performance requirements.

Table 1–11: Nominal traits — Frequency

Characteristics Description

Range

RF mode 10 MHz to 3 GHz BASEBAND mode 50 Hz to 10 MHz

Span

RF mode 100 Hz to 3 GHz BASEBAND mode 100 Hz to 10 MHz

Stability of Frequency Standard

Residual FM Maximum 3 Hz

10–9/day

Specifications

Table 1–12: Nominal traits — Amplitude

Characteristics Description

Input impedance 50

Input VSWR

A/D converter 12 bits, 25.6 MS/s

Input anti-aliasing filter

1.5 (reference level w–20 dBm)

0.3 dB (v10 MHz), –60 dB (w15.5 MHz)

3026 3 GHz Real Time Spectrum Analyzer Service Manual

1–9

Specifications

Table 1–13: Nominal traits — FFT

Characteristics Description

Number of FFT points 1024 or 256

FFT window Blackman-Harris

Hamming Rectangle

Operation Accuracy 16-bit

Block-floating point

Overlapping

1024 points 512 points (at 2 MHz span)

768 points (at 1 MHz span) 896 points (at 500 kHz span) 896 points (at 200/20/2 kHz span) 960 points (at 100/10/1 kHz span) 992 points (at 50/5 kHz span) 992 points (at 500/200/100 Hz span)

256 points 128 points (at 2 MHz span)

192 points (at 1 MHz span) 224 points (at 500 kHz span) 128 points (at 200/20/2 kHz span) 192 points (at 100/10/1 kHz span) 224 points (at 50/5 kHz span) 224 points (at 500/200/100 Hz span)

1–10

3026 3 GHz Real Time Spectrum Analyzer Service Manual

Table 1–14: Nominal traits — Filter

Characteristics Description

Filter type

5 MHz span 134-tap FIR filter

2 MHz span 201-tap FIR filter

1 MHz span 268-tap FIR filter

500 kHz span 317-tap FIR filter

200 kHz span 391-tap FIR filter

100 kHz span 503-tap FIR filter 50 kHz span 503-tap FIR filter with 4-stage comb filter 20 kHz span 503-tap FIR filter with 4-stage comb filter 10 kHz span 503-tap FIR filter with 4-stage comb filter 5 kHz span 459-tap FIR filter with 4-stage comb filter 2 kHz span 503-tap FIR filter with 4-stage comb filter 1 kHz span 459-tap FIR filter with 4-stage comb filter 500 Hz span 459-tap FIR filter with 4-stage comb filter 200 Hz span 459-tap FIR filter with 4-stage comb filter 100 Hz span 503-tap FIR filter with 4-stage comb filter

FIR filter coefficient length 20 bits

Specifications

Table 1–15: Nominal traits — Trigger/Acquisition

Characteristics Description

Trigger mode Auto, Normal

Trigger source Internal or External

Internal trigger

Resolution 19 bits

External trigger

Input level 1.6 V "0.2 V

Acquisition mode Block or Roll

Maximum block length

1,024 FFT points 1,000 frames

256 FFT points 4,000 frames

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Specifications

Table 1–16: Nominal traits — System control

Characteristics Description

Bus type ISA

CPU type 486 DX4-100 MHz

Main memory 32 M bytes

Hard disk drive 2.5 inches, 3 M bytes, solid-state disk

2.5 inches, 2.1 G bytes, hard disk

Floppy disk drive 3.5 inches, 2HD (1.44 M bytes)

Table 1–17: Nominal traits — AC line power

Characteristics Description

Line voltage 100 to 240 VAC

Line frequency 48 Hz to 63 Hz

Table 1–18: Nominal traits — Mechanical

Characteristics Description

Dimensions Height 165 mm

Width 376 mm (handle included)

length 495 mm

Net weight 13.0 kg

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3026 3 GHz Real Time Spectrum Analyzer Service Manual

Specifications

Certification and Compliances

The certification and compliances for the 3026 Real Time Spectrum Analyzer are listed in Table 1–19.

Table 1–19: Certifications and compliances

Characteristic Description

EC Declaration of Conformity – EMC Meets intent of Directive 89/336/EEC for Electromagnetic Compatibility. Compliance

was demonstrated to the following specifications as listed in the Official Journal of the European Union:

EN 55011 Class A Radiated and Conducted Emissions

EN 50081-1 Emissions:

EN 61000–3–2 AC Power Line Harmonic Emissions

EN 50082-1 Immunity:

EN61000–4–2 Electrostatic Discharge Immunity EN61000–4–3 RF Electromagnetic Field Immunity EN61000–4–4 Electrical Fast Transient/Burst Immunity EN61000–4–5 Power Line Surge Immunity EN61000–4–6 Conducted Disturbances Induced by RF Fields EN61000–4–8 Power Frequency Electromagnetic Field EN61000–4–11 Power Line Interruption Immunity

Australia/New Zealand Declaration of Conformity – EMC

Complies with EMC provision of Radiocommunications Act per the following standard(s):

AS/NZS 2064.1/2 Industrial, Scientific, and Medical Equipment: 1992

EC Declaration of Conformity – Low Voltage Compliance was demonstrated to the following specification as listed in the Official

Journal of the European Union:

Low Voltage Directive 73/23/EEC, amended by 93/69/EEC

EN 61010-1:1993 Safety requirements for electrical equipment for

measurement control and laboratory use.

U.S. Nationally Recognized Testing Laboratory Listing

Canadian Certification CAN/CSA C22.2 No. 231 CSA safety requirements for electrical and electronic

Additional Compliance ANSI/ISA S82.01:1994 Safety standard for electrical and electronic test,

UL3111-1 Standard for electrical measuring and test equipment.

measuring and test equipment.

measuring, controlling, and related equipment.

IEC61010-1 Safety requirements for electrical equipment for

measurement, control, and laboratory use.

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Specifications

Table 1–19: Certifications and compliances (Cont.)

Characteristic Description

Installation (Overvoltage) Category Terminals on this product may have different installation (overvoltage) category

designations. The installation categories are:

CAT III Distribution-level mains (usually permanently connected). Equipment at this

level is typically in a fixed industrial location.

CAT II Local-level mains (wall sockets). Equipment at this level includes

appliances, portable tools, and similar products. Equipment is usually cord-connected.

CAT I Secondary (signal level) or battery operated circuits of electronic equipment.

Pollution Degree A measure of the contaminates that could occur in the environment around and within

a product. Typically the internal environment inside a product is considered to be the same as the external. Products should be used only in the environment for which they are rated.

Pollution Degree 1 No pollution or only dry, nonconductive pollution occurs.

Products in this category are generally encapsulated, hermetically sealed, or located in clean rooms.

Pollution Degree 2 Normally only dry, nonconductive pollution occurs.

Occasionally a temporary conductivity that is caused by condensation must be expected. This location is a typical office/home environment. Temporary condensation occurs only when the product is out of service.

Pollution Degree 3 Conductive pollution, or dry, nonconductive pollution that

becomes conductive due to condensation. These are sheltered locations where neither temperature nor humidity is controlled. The area is protected from direct sunshine, rain, or direct wind.

Pollution Degree 4 Pollution that generates persistent conductivity through

conductive dust, rain, or snow. Typical outdoor locations.

Safety Certification Compliance

Equipment Type Test and measuring

Safety Class Class 1 (as defined in IEC 1010-1, Annex H) – grounded product

Overvoltage Category Overvoltage Category II (as defined in IEC 1010-1, Annex J)

Pollution Degree Pollution Degree 2 (as defined in IEC 1010-1). Note: Rated for indoor use only.

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3026 3 GHz Real Time Spectrum Analyzer Service Manual

Operating Information

Installation

Supplying Operating Power

NOTE. Read all information and heed all warnings in this subsection before connecting the analyzer to a power source.

WARNING. AC POWER SOURCE AND CONNECTION. The analyzer operates from a single-phase power source. It has a three-wire power cord and two-pole, three-terminal grounding type plug. The voltage to ground (earth) from either pole of the power source must not exceed the maximum rated operating voltage, 250 volts.

Before making connection to the power source, be sure the analyzer has a suitable two-pole, three-terminal grounding-type plug.

GROUNDING. This instrument is safety Class 1 equipment (IEC designation). All accessible conductive parts are directly connected through the grounding conductor of the power cord to the grounded (earthing) contact of the power plug.

WARNING. The power input plug must be inserted only in a mating receptacle with a grounding contact where earth ground has been verified by a qualified service person. Do not defeat the grounding connection. Any interruption of the grounding connection can create an electric shock hazard.

For electric shock protection, the grounding connection must be made before making connection to the instrument’s input or output terminals.

Power Cord Information

3026 3 GHz Real Time Spectrum Analyzer Service Manual

A power cord with the appropriate plug configuration is supplied with each analyzer. Table 2–1 gives the color-coding of the conductors in the power cord. If you require a power cord other than the one supplied, refer to Table 2–2, Power cord identification.

2–1

Installation

Table 2–1: Power-cord conductor identification

Conductor Color Alternate color

Ungrounded (Line) Brown Black

Grounded (Neutral) Light blue White

Grounded (Earthing) Green/Yellow Green

Table 2–2: Power cord identification

Plug configuration Normal usage Option number

North America 125 V

Europe 230 V

United Kingdom 230 V

Australia 230 V

North America 230 V

Switzerland 230 V

Standard

2–2

Operating Voltage

This analyzer operates with any line voltage from 85–264 VAC

with any line

RMS

frequency from 47–66 Hz. Before plugging the cord in the outlet, be sure that the power supply voltage is proper.

3026 3 GHz Real Time Spectrum Analyzer Service Manual

Operating Environment

Installation

The following environmental requirements are provided to ensure proper operation and long instrument life.

Operating Temperature

Ventilation Requirements

Operate the analyzer where the ambient air temperature is from 10_ C to +40_ C with no diskette in the floppy drive. Store the analyzer in ambient temperatures from –20_ C to +60_ C with no diskette in the floppy drive. After storage at temperatures outside the operating limits, allow the chassis to stabilize at a safe operating temperature before applying power.

The analyzer has a exhaust fan on its left side panel. Air enters the cabinet through the air intakes on the right side, and exhausts through the exhaust fan. To allow air circulation, leave the following space around the analyzer.

When used on a bench top:

Top and bottom surfaces 2.5 cm or more. . . . .

Left and right surfaces 15 cm or more. . . . . . .

Rear surface 7.5 cm or more. . . . . . . . . . . . . . .

When mounted on 19 inch rack:

Top and bottom surfaces 2.5 cm or more. . . . .

Left and right surfaces 5 cm or more. . . . . . .

Rear surface 7.5 cm or more. . . . . . . . . . . . . . .

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Installation

Applying and Interrupting Power

Consider the following information when you power on or power off the instrument, or when power is interrupted due to an external power failure.

Power On

To turn on the power to the analyzer, turn on the ON/STBY button located at the bottom left corner of the front panel. When you turn on the power, Windows 95 is booted and the system software is subsequently started.

Upon power on, the analyzer runs a power-on self check. See Section 6, Maintenance, for information on diagnostics and fault isolation.

ON/STBY

button

2–4

Power Off

Figure 2–1: Power switch

When you place the ON/STBY button on the front panel in the STAND-BY position, the internal software detects the condition of the power switch and shuts down the system before powering off the analyzer. You need not terminate the application software of the analyzer or Windows 95 before the shutdown.

CAUTION. When turning on or off the power, be sure to use the ON/STBY button on the front panel. While the power cord remains unplugged from the AC outlet, or no voltage is being supplied to the AC outlet, be sure to keep the ON/STBY button in the STAND-BY position.

Placing the front panel power switch in the STAND-BY position does not cause the master mains to be off completely. To turn it off, unplug the power cord from the outlet.

3026 3 GHz Real Time Spectrum Analyzer Service Manual

Repackaging Instructions

If you ship the analyzer, pack it in the original shipping carton and packing material. If the original packing material is not available, package the instrument as follows:

1. Obtain a corrugated cardboard shipping carton with inside dimensions at

2. If you are shipping the instrument to a Tektronix field office for repair, attach

3. Wrap the instrument with polyethylene sheeting or equivalent material to

4. Cushion the instrument in the shipping carton by tightly packing dunnage or

Installation

least 15 cm (6 inches) taller, wider, and deeper than the instrument. The shipping carton must be constructed of cardboard with 170 kg (375 pound) test strength.

a tag to the instrument showing the instrument owner and address, the name of the person to contact about the instrument, the instrument type, and the serial number.

protect the finish.

urethane foam on all sides between the carton and the analyzer. Allow

7.5 cm (3 in) on all sides, top, and bottom.

Installed Options

5. Seal the shipping carton with shipping tape or an industrial stapler.

NOTE. Do not ship the instrument with a diskette inside the floppy disk drive. When the diskette is inside the drive, the disk release button sticks out. This makes the button more prone to damage than otherwise.

Your instrument may be equipped with one or more instrument options. Except for the line-cord options described by Table 2–2 on page 2–2, all options and optional accessories are listed and described in Section 7, Options. For further information and prices of instrument options, see your Tektronix Products catalog or contact your Tektronix Field Office.

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Installation

2–6

3026 3 GHz Real Time Spectrum Analyzer Service Manual

Operating Instructions

Before doing service, read the following operating instructions. These instructions are at the level appropriate for servicing these analyzer. The User Manual contains more complete operating instructions.

Additional instructions are integrated into the service procedures found in later sections of this manual. For instance, the procedures found in the section Performance Verification contain instructions for making the front-panel settings required to check each instrument characteristic included there. Also, the general instructions for operating the analyzer’s internal diagnostic routines are found in Section 6, Maintenance. You may also find the Product Description in Section 1 useful for understanding how the analyzer functions.

Preparations

To start this tutorial, the following devices are required:

Signal generator or function generator

Example: Arbitrary Waveform & Function Generator

Sony Tektronix AFG320

Two BNC cables

One N–BNC conversion connector (standard accessory)

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Operating Instructions

Setup

1. First, make preparations for outputting. AM modulation signals from the

signal generator.

a. Connect the CH2 output of the signal generator to AM IN on the rear

panel of the signal generator with a BNC cable.

b. Set up the signal generator as follows:

CH1 output:

Function SINE. . . . .

Frequency 16 MHz. . . .

Amplitude 0.1 V. . . Modulation AM. . .

CH2 output:

Function SINE. . . . .

Frequency 1 MHz. . . .

Amplitude 1.0 V. . .

2. Use the other BNC cable and BNC–N conversion connector to connect the

CH1 output of the signal generator with the RF INPUT connector on the

3026 front panel. (See Figure 2–2).

RF INPUT connector

2–8

Figure 2–2: RF INPUT connector

3026 3 GHz Real Time Spectrum Analyzer Service Manual

Turning On the Power

Operating Instructions

1. Press the ON/STBY button on the front panel of the 3026.

When you press the ON/STBY button, the system comes up and performs Power-on self test. When the test is complete, system information appears at the center of display. (See Figure 2–3.)

Figure 2–3: System information

In this condition, if you press any front panel button, or turn the general purpose knob, the system information will be removed and the initial screen appears as shown in Figure 2–4.

Figure 2–4: Initial screen

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Operating Instructions

Observing Spectrum

SUMMARY. This section describes how to change the basic settings to view the spectrum after the system has been installed.

Acquiring Data

When power is turned on, the initial settings are 100 MHz center frequency and 2 MHz span. First, change these settings to view the spectrum.

1. Press the START/STOP button. (See Figure 2–5.)

The LED on the top left of the button lights up, and a trace appears on the

display.

START/STOP button

2–10

Figure 2–5: START/STOP button

3026 3 GHz Real Time Spectrum Analyzer Service Manual

Operating Instructions

2. Press the FREQ button.

Use the general purpose knob or value entry keys to set the center frequency to 16 MHz.

You should have obtained the spectrum display. The current span is set to 2 MHz. Next, change the span.

3. Press the SPAN button.

Set the span to 10 MHz by using the general purpose knob or value entry keys. Pressing the Span 10 MHz bottom button will produce the same result.

Figure 2–6 shows a typical spectrum display with the center frequency set to 16 MHz and the span set to 10 MHz.

Figure 2–6: Typical spectrum display (16 MHz center frequency and 10 MHz span)

3026 3 GHz Real Time Spectrum Analyzer Service Manual

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Operating Instructions

Dividing the Display Area and Changing the Display Mode

SUMMARY. This section describes how to divide the display area into two and observe the data in different display modes.

Dividing the Display Area

To divide the display area and change the display mode, use the buttons located in the DISPLAY area. (See Figure 2–7.)

Figure 2–7: Buttons in DISPLAY area

4. Press the

The display area is divided into two. The upper section displays the

spectrogram and the lower section displays the spectrum, as shown in Figure

2–8.

button located in the DISPLAY area.

2–12

Figure 2–8: Spectrogram display (upper) and spectrum display (lower)

3026 3 GHz Real Time Spectrum Analyzer Service Manual

Operating Instructions

Changing the Display

Mode

Next, change the upper section into the waterfall display.

5. Press the SELECT button located at the bottom right of the general

purpose knob. (See Figure 2–9.)

SELECT button

Figure 2–9: SELECT button

The color of upper scale of the spectrogram display changes from gray to blue. This indicates that the active area (that for which setting changes and operations are valid) has been switched to the upper section.

NOTE. If the display area has been split, check which area is active before you change the settings.

3026 3 GHz Real Time Spectrum Analyzer Service Manual

2–13

Operating Instructions

6. Press the

spectrogram display to waterfall display.

button in the DISPLAY area. The upper half is changed from

Figure 2–10: Waterfall display and spectrum display

Next, return the display to the previous condition.

7. Press the SELECT button.

The color of the top part of the lower scale changes from gray to blue.

8. Press the

button in the DISPLAY area.

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3026 3 GHz Real Time Spectrum Analyzer Service Manual

Using the Block Mode to Acquire Data

SUMMARY. This section describes how to acquire data by using the Block mode.

In the Block mode, all the data is acquired and then it is displayed, unlike the Roll mode in which each frame it displayed directly after it is acquired.

Operating Instructions

Changing the Basic

Settings

Acquiring Data

The Block mode is valid for a span setting of 2 MHz or lower. Therefore, first change the span setting. In addition, change the trigger mode to auto mode because the trigger function is not used in this example.

9. Press the Span 2 MHz bottom button. Alternatively, the general purpose

knob or value entry keys may be used.

10. Press the TRIG button.

11. Press the Mode bottom button.

12. Press the Trig Mode side button to select Auto.

The above steps complete the preparation for data acquisition in the Block mode.

13. Press the ROLL BLOCK button.

ROLL BLOCK button

Figure 2–11: ROLL BLOCK button

3026 3 GHz Real Time Spectrum Analyzer Service Manual

2–15

Operating Instructions

During data acquisition, a dialog box titled “Processing Data... Please Wait” is indicated on the display. After the completion of data acquisition, the waveform is displayed. (See Figure 2–12.)

Unlike the Roll mode, there is noticeable delay before data is displayed in the Block mode. This is because data is displayed after sufficient data is acquired to match the length specified by the block size and block count. Once the all the data is acquired, acquisition ends and the data is displayed.

2–16

Figure 2–12: Data acquisition in the Block mode

When data has been acquired in the Block mode, return the data acquisition mode to the Roll mode.

14. Press the ROLL BLOCK button.

The LED at the top left of the button turns off, which indicates that the data

acquisition mode has changed to the Roll mode.

15. Press the START/STOP button.

The LED at the top left of the button turns on and data acquisition is

resumed.

3026 3 GHz Real Time Spectrum Analyzer Service Manual

Using Dual Markers

Operating Instructions

SUMMARY. This section describes the procedure of using dual markers to measure the frequency difference between two peaks in the spectrum.

Before starting the operation, return the span setting to 10 MHz.

16. Press the SPAN button.

17. Press the Span 10 MHz bottom button.

Displaying Dual Markers

Place markers on the waveform as follows:

18. Press the MARKER button.

19. Press the Marker Setup bottom button.

20. Press the Dual Marker side button.

This operation places two markers on the waveform: a “[x]” marker (MARKER1) and a “+” marker (MARKER2). (See Figure 2–13.)

Of these two markers, the “[x]” marker is highlighted and the “+” marker is dimmed. This indicates that the “[x]” marker is the active one: the marker which

a/'

can be moved by the general purpose knob or the

buttons.

Figure 2–13: Displaying dual markers

3026 3 GHz Real Time Spectrum Analyzer Service Manual

2–17

Operating Instructions

Moving Markers

Next, move the two markers to the peaks which are located on the right and left of the center peak.

21. Using the general purpose knob or the

a/'

button, move the “[x]” marker to the peak located on the left of the center spectrum. The value entry keys may be used to enter the value directly.

22. Press the MARKER TOGGLE button located at the top right of the general

purpose knob. (See Figure 2–14.)

MARKER TOGGLE button

Figure 2–14: MARKER TOGGLE button

This operation toggles the active marker to the “+” marker located on the center spectrum. The “+” marker will be highlighted.

a/'

23. Using the general purpose knob or the

button, move the “+” marker to the peak located on the right of the center spectrum. The value entry keys may be used to enter the value directly.

NOTE. A more sophisticated way of moving a marker to a peak in the spectrum is to use the Peak Find feature.

The frequency and amplitude differences between the two markers are displayed as the DELTA readout. Further, the frequency difference is indicated as a negative value because the marker value is calculated based on the position of active marker. When you toggle the position of active marker, the frequency will change to a positive value.

2–18

3026 3 GHz Real Time Spectrum Analyzer Service Manual

Operating Instructions

24. Press the MARKER TOGGLE button again.

The active marker is toggled and the frequency difference is indicated as a positive value. (See Figure 2–15.)

Figure 2–15: Measurement of frequency difference with dual markers

3026 3 GHz Real Time Spectrum Analyzer Service Manual

2–19

Operating Instructions

Trigger and Mask Pattern

SUMMARY. Using a trigger mask pattern, triggering is available in two dimensions: frequency and level. How to create a trigger mask pattern and how to receive a trigger are described below.

In this tutorial, a trigger is made to occur by turning from the CH2 output of the signal generator.

Changing the Basic

Settings

Creating a Trigger Mask

Pattern

Before creating a trigger mask pattern, change the basic settings.

25. Change the span to 2 MHz to make the Block mode data acquisition

possible.

Press the Span 2 MHz bottom button.

26. The spectrum of the modulated wave will appear on the display.

Change the CH2 output frequency of the generator to 500 kHz.

Create a trigger region over the spectrum of the modulated wave so that a trigger will occur when the wave is turned on. After the setup procedure shown below, a trigger will occur if the spectrum enters this region. (i.e., when the spectrum breaks out of the trigger mask.)

27. Create a trigger region on the spectrum of the modulated wave located on the

left side. (See Figure 2–16.)

a. Press the TRIG button. b. Press the Edit Freq–Mask bottom button. c. Press the Display side button to select On.

2–20

This operation changes the color inside the scale to blue, and makes the other items in the side menu available for creating a trigger mask.

d. Place an edit marker (a red arrow marker) on the bottom left of the

region.

Press the Dir side button and select Hori. Next, use the general purpose knob to set the horizontal position.

Press the Dir side button and select Vert. Next, use the general purpose knob to set the vertical position.

3026 3 GHz Real Time Spectrum Analyzer Service Manual

Operating Instructions

e. Press the MARKER TOGGLE button.

This operation changes the position of the edit marker with that of the “[x]” marker.

f. Position the edit marker at the bottom right of the region.

As with step d above, set horizontal and vertical positions.

g. Press the Set side button.

The above steps complete the creation of a trigger region to the left of the peak spectrum. See Figure 2–16.

Figure 2–16: Creation of trigger region

Although just this region allows triggering, create another trigger region on the right side spectrum for practice.

3026 3 GHz Real Time Spectrum Analyzer Service Manual

2–21

Operating Instructions

28. Create a trigger region on the spectrum located on the right side. (See Figure

2–17.) a. As with substeps d to g in step 27, create a trigger region.

The above operation has created the intended trigger mask. The blue region is the created trigger mask.

Setting Trigger Conditions

2–22

Figure 2–17: Created trigger mask (blue region)

Next, establish trigger conditions as follows so that triggering occurs if the spectrum appears outside the created trigger mask.

29. Press the Mode bottom button.

30. Press the Trig Mode side button and select Normal.

31. Press the Trig–Mask Condition bottom button.

32. Press the Freq–Mask side button and select Break. Break causes a trigger when any part of the spectrum rises above the trigger

mask. Inside causes a trigger when any part of the spectrum falls below the trigger mask.

3026 3 GHz Real Time Spectrum Analyzer Service Manual

Operating Instructions

Now, turn off the output of the modulation wave of the generator to ensure the spectrum remains within the trigger mask. (See Figure 2–18.)

33. Turn off the CH2 output of the generator. The above steps have completed the arrangements for triggering with a trigger

mask.

Figure 2–18: Waveform display before triggering

Acquiring Data

3026 3 GHz Real Time Spectrum Analyzer Service Manual

Next, use the created trigger mask to detect a trigger condition.

34. Press the ROLL BLOCK button.

When you press the button, a small window appears at the center of the display, indicating the system is waiting for a trigger. At this moment, the message “Input waveform: data is not acquired” is indicated on the top left of the scale in red.

35. Turn on the CH2 output of the signal generator.

Soon a trigger will occur and the waveform is displayed.

2–23

Operating Instructions

Changing the Display Frame

SUMMARY. This section describes how to change the display frame of the data acquired in the Block mode, and to examine how the waveform changes with time. In this tutorial, you can use those data acquired by the “Trigger and Mask Pattern” on page 2–20.

In the section of “Trigger and Mask Pattern”, the mask pattern trigger function is used to acquire data in the Block mode.

In the Block mode, acquired data fills the number of frames specified by the block size and block count. The block size is set to 20 by the initial setting (factory default), thus 20 frames of data will be acquired.

The following steps change the frame from the acquired data lies that is displayed. This is done by changing the frame on which the marker. To do this, first turn a marker on.

36. Press the MARKER button.

37. Press the Marker Setup bottom button.

38. Press the Single Marker side button.

The “[x]” marker (MARKER1) is displayed on the center spectrum.

39. Press the Frame bottom button. The number of the displayed frame can now be set by the general purpose

knob. Observe that the frame number “0” is displayed just above the side menu.

40. Turn the general purpose knob to change the display frame. Turn the general purpose knob clockwise to increase the frame number, and

observe how the displayed waveform spectrum changes. Continue turning the general purpose knob and you will notice the first

frame in which right and left peaks just rose above the trigger mask. The trigger occurred in this frame. (See Figure 2–19.)

2–24

3026 3 GHz Real Time Spectrum Analyzer Service Manual

Operating Instructions

Figure 2–19: Frame in which trigger occurred

As shown above, data acquisition in the Block mode allows you to observe the waveform change frame by frame.

3026 3 GHz Real Time Spectrum Analyzer Service Manual

2–25

Operating Instructions

Shutting Power Off

With the following procedure, shut off the power supply to the 3026 and to the signal generator.

41. Press the ON/STBY button on the instrument front panel. A dialog box of “Saving current setup data.” appears on the center of the

display, then power is turned off.

42. Turn off power to the signal generator.

The above steps conclude the tutorials.

2–26

3026 3 GHz Real Time Spectrum Analyzer Service Manual

Theory of Operation

This section describes the electrical operation of the 3026 Real Time Spectrum Analyzer using the major circuit blocks or modules as shown in Figure 9–1.

Module Overview

3 GHz Down Converter

The 3 GHz Down Converter Unit consists of 6 blocks:

IF converter (1 Synthesizer 25 MHz CAL signal generator 10 MHz reference frequency generator Selecting and distributing circuit Bypass relay logic circuit

The down converter works in the RF (10 MHz to 3 GHz) or Baseband (50 Hz to 10 MHz) mode.

3 GHz Down Converter in RF Mode (10 MHz to 3 GHz). The down converter converts the input RF signals with frequency ranging from 10 MHz to 3 GHz into the 3 in a 1 MHz step.

The input RF signal is mixed with LO (Local Oscillator) signals in a 1 MHz step within the converter, and is finally converted into the IF frequency signals. The center frequency is 21.4 MHz. Each of the LO signals is generated by its synthesizer using the 10 MHz reference clock.

The RF mode needs to set and adjust reference level. Adjusting the conversion sensitivity and setting reference levels are done using the programmable attenuator and amplifier, which are in the 1 converter output stage.

IF frequency signal of 21.4 MHz. The down-conversion frequency is

st/2nd/3rd

)

converter input stage and in the 3

The CAL signal generating circuit generates highly stable CAL signals of 25 MHz for calibrating conversion gains.

The 10 MHz reference frequency selection and distribution circuit selects an internal or external 10 MHz reference frequency, and outputs the reference signal to the synthesizer, the clock generating circuit on the A5 Baseband board, and the 10 MHz output connector on the rear panel.

3026 3 GHz Real Time Spectrum Analyzer Service Manual

3–1

Theory of Operation

3 GHz Down Converter in Baseband Mode (50Hz to 10MHz). In the Baseband mode, the input RF signals are sent directly to the A5 Baseband board. The 3 GHz down converter is bypassed by the mechanical relay unit. The down converter circuit is only used in the RF mode (10 MHz to 3 GHz). In the Baseband mode, the input frequency ranges from 50 Hz to 10 MHz.

Baseband Board (A5)

The A5 Baseband board consists of 6 blocks:

AC/DC/GND input switching circuit Programmable ATT (Attenuator) LPF (Low Pass Filter) BPF (Band Pass Filter)

mixer

Buffer amplifier

It performs signal processing including level adjustment, band limiting, and frequency conversion, as required for A/D conversion.

AC/DC/GND Input Switching Circuit. The AC/DC/GND input coupling switching is only used in the Baseband mode. In the RF mode, the AC coupling is used.

Programmable ATT. The programmable ATT is also used in the Baseband mode only.

Low Pass Filter. The LPF remove unwanted high frequency signals to prevent aliasing in the A/D converter.

3–2

DDC Board (A7)

Band Pass Filter. The BPF prevents excessive input of out-of-band signals, while

stopping images generated in the 4

Mixer. The 4th mixer is only used in the RF mode. It converts the 3rd IF

signals sent from the 3 GHz down converter into the 4

mixer.

IF frequency signals

which can be A/D-converted.

The A7 Digital Down Converter (DDC) board consists of 5 blocks:

DC level shifter Excessive input detection circuit 12 bit A/D converter Digital mixer Digital filter

3026 3 GHz Real Time Spectrum Analyzer Service Manual

Theory of Operation

This board has these functions:

Digital signal processing (including digitization of input signals) I/Q separation Frequency conversion (before outputting the signals to the FFT board)

12-bit A/D Converter. The analog signal is converted to digital data using a 12 bit A/D Converter with 25.6 MHz sample/second. The process includes frequency conversion and I/Q separation by the digital orthogonal mixer. Then unwanted bands are removed and a sample rate change is performed by the subsequent digital filter.

Analog Block. Analog signals are processed with canceling DC offsets, as well as DC level shifting to be fitted within the input range of A/D converter by the input buffer, then input to the A/D converter.

The output level of the signals from the input buffer is monitored by the excessive input signal detection circuit, and “OVERLOAD” is displayed on the LCD (Liquid Crystal Display) screen if the specified level is exceeded.

FFT Board (A6)

In the secondary digital mixer, frequency conversion depending on the center frequency setting is performed. Band limiting suitable for the span settings and sample rate changing are performed by the subsequent multiple-step digital filter.

The A6 FFT board sends out I/Q data converted into the frequency domain, time domain data without conversion, and trigger signals to the A8 Memory board.

The FFT board consists of 5 blocks:

Input FIFO FFT processor Output FIFO Clock generating circuit Distributing circuit

Input FIFO. The input FIFO consists of multiple dual-port RAMs and a control circuit. It accumulates a block of input data in units of 1024 points or 256 points from the DDC board at data rate varying with setting of span, and sends the data to the FFT processor at a fixed clock rate.

3026 3 GHz Real Time Spectrum Analyzer Service Manual

3–3

Theory of Operation

FFT Processor. The FFT processor converts time domain data in blocks of 1024 points or 256 points into frequency domain data at high speed. The output from the FFT, which appears in bursts, is input to the output FIFO, from which the data is sent to the A8 memory board at more regular rate.

Output FIFO. The FIFO system is divided into two parts. One handles frequency domain data, and the other time domain data. This improves the operating rate, and allows real time analysis up to 2 MHz span.

Time domain data from the A7 DDC board branches into the two parts. The time part has a single FIFO, from which time domain data is sent unchanged to the memory board. The frequency part has a two stage FIFO arrangement. The frequency domain data is sent from the second (output) FIFO to the Memory board.

Memory Board (A8)

The A8 Memory board stores the acquired I/Q data, and controls signal processing hardware. It consists of 8 blocks:

Acquisition memory (made up with data banks 0, 1, 2, and 3) Address counter (FPGA) Trigger memory Trigger generating logic circuit (FPGA) External trigger input circuit Local controller (FPGA) Clock generating circuit GPIB interface

Acquisition Memory. The acquisition memory consists of four data banks 0, 1, 2, and 3, which have a capacity of 2 M-bytes each (total 8 M-bytes). This memory stores the I/Q data for frequency and time domain, occupying 4 M-bytes each.

Address Counter (FPGA). The address counter generates addresses for one FFT point (bin) or one time-domain point, and maps addresses on the memories.

Trigger Memory. The trigger memory is written under the firmware control from the 486 CPU board. The trigger conditions are created by a user who edits the trigger mask patterns using the input menu.

3–4

The trigger memory data (level data) are compared with the acquisition data (I and Q imaginary data) by the magnitude comparator logic (FPGA) on the A8 Memory board.

3026 3 GHz Real Time Spectrum Analyzer Service Manual

Theory of Operation

Trigger Logic. The Trigger Logic consists of 3 blocks:

Multiplier Adder Magnitude comparator

The momentary power level calculated in real-time based on the I/Q data is compared with the trigger conditions to generate trigger signals, then output to the A8 Memory board.

Local Controller (FPGA). The local controller sets up and controls all the signal processing hardware ranging from the down converter to the Memory board, and sends the upper bits of addresses to the acquisition memory to control writing frame data.

Clock Generation. The clock generation/distribution circuit generates and distributes synchronous system clock used by the FFT and Memory boards.

The clock generation circuit consists of a digital control VCXO. It generates sampling clocks for the A/D converter locked with the 10 MHz reference frequency supplied from the 3 GHz Down Converter, as well as LO signals for

the 4

mixer.

486 CPU Board

External Trigger Circuit (FPGA). The external triggering circuit detects a rising

edge in external trigger input signals, and sends an interrupt to the 486 CPU board.

The 486 CPU board is installed with an Intel 486 100 MHz processor and real-time OS. It carries out various acquisition data processing and outputs the data to and receives data from the local controller.

The 486 CPU board controls entire system including the user interface, monitor display, and these external interfaces:

GPIB interface LAN network interface Parallel port interface LCD interface

This board also has a 2.5 inch 2.1 G-byte hard disk drive and a 3.5 inch floppy disk drive as peripheral devices. It is equipped with keyboard, mouse, and Centronics parallel connectors.

3026 3 GHz Real Time Spectrum Analyzer Service Manual

3–5

Theory of Operation

Mother Board (A1)

Power Supply Unit

The Mother board consists of the ISA bus and local bus connectors for connecting these boards:

CPU board (ISA bus) A6 FFT board (ISA bus and local bus) A7 DDC board (ISA bus and local bus) A8 Memory board (ISA bus and local bus)

The Mother board also has Power On/Off Control Logic and some stabilized power supply circuits.

Power On/Off Control Logic. The Mother board controls the interfaces between the boards and supplies the power. The power supply circuit on the Mother board use a +24 V input to generate +20 V and +15 V output power using to be supplied to the A5 Baseband board.

The Power Supply Unit supplies +24 V/6.5 A DC to these modules:

A1 Mother board A10 Sub Power board A11 DC Power-1 board A12 DC Power-2 board DC fan (+24 V DC) 3 GHz Down Converter unit

Sub Power Board (A10)

DC Power-1 Board (A11)

The Sub Power board always supplies a +5V standby DC output, converted from 100 to 250 V AC, for the power control circuitry on the A1 Mother board in only a small amount to the control logic.

The DC Power-1 board has two DC/DC Converter units. It generates two voltages from +24 V DC:

+12 V/4.2 A DC (max) +5 V/20 A DC (max)

The power is supplied to these modules:

Hard disk drive Silicon hard disk unit Floppy disk unit LCD display unit A1 Mother board A6 FFT board A7 DDC Board A8 Memory board CPU board (with a fan)

3–6

3026 3 GHz Real Time Spectrum Analyzer Service Manual

Theory of Operation

DC Power-2 Board (A12)

10 MHz Reference

Oscillator

The DC Power-2 board converts from +24 V DC power to these voltages:

Analog –12 V/ digital *12V Analog –5 V Analog +5 V Analog +12 V Analog +24 V

Then it supplies the power to the following modules:

3 GHz Down Converter unit A5 Baseband board A1 Mother board +24 V DC fan

The DC Power-2 board also has a power switch and power supply remote control circuit, which turn off the power upon detection of a signal from the CPU board, thus preventing accidents caused by any unintentional shut down of the power.

The internal 10 MHz Reference Oscillator is a highly-stable oven-controlled crystal oscillator and provides the internal 10 MHz reference frequency to the 3 GHz Down Converter.

Instead of the internal 10 MHz reference signal, the external reference signal can be used through the rear panel connector.

LCD Display Unit

All the synthesizers (in the 3 GHz Down Converter unit) and oscillators output signals locked to the 10 MHz reference frequency selected and distributed by the 3 GHz Down Converter.

The LCD display unit is a color 640 480 pixel 6.4 inch VGA compatible TFT/LCD panel. It displays user interface information created by the 486 CPU board.

The LCD interface output signal of the 486 CPU board is buffered in the LCD buffer logic on the A1 Mother board, and then output to the LCD display unit.

3026 3 GHz Real Time Spectrum Analyzer Service Manual

3–7

Theory of Operation

Front Panel Key Boards

(A2 and A3)

Hard Disk Drive

The Front Panel Key board-1 and -2 consist of the following blocks:

Single chip key controller (Micro Controller MC68HC705) On-chip ROM/RAM Push keys Menu select push keys Rotary encoder LEDs RS-232C to/from TTL Level Conversion Logic

Rotary encoder changes span, frequency, and reference level. LEDs show the selected key, acquisition state and mode. Key data is sent to the CPU board, coded in RS-232C serial data format.

The 486 CPU board communicates with MC68HC705 MPU using the RS-232C COM1 serial port. RS-232C to/from TTL Level Conversion Logic controls the communication between the 486 CPU and the MC68HC705 (Key Board-1 and

-2 Controller CPU) by the RS-232C serial data line.

The hard disk unit includes the 2.1 G-byte Hard Disk Drive and Solid State Disk.

2.1 G-byte Hard Disk Drive. The hard disk is used for storing these kinds of data:

Floppy Disk Drive

Acquisition data (xxxxx.iqa) Setup data (xxxxx.cfg) Screen hardcopy image data (BMP or EPS format)

2.5 inch Solid State Disk. The solid state (silicon) disk contains files of the

following categories:

3026 operating system 3026 firmware 3026 calibration data

The 3.5 inch floppy disk drive is used for storing these data:

Acquisition data Screen hardcopy data (BMP or EPS format)

It is also used for updating the firmware and hardware controls.

3–8

3026 3 GHz Real Time Spectrum Analyzer Service Manual

Performance Verification

Two types of Performance Verification procedures can be performed on this product: Self Tests and Performance Tests. You may not need to perform all of these procedures, depending on what you want to accomplish.

To rapidly confirm that the 3026 functions and was adjusted properly, just do the Self Tests, which begin on page 4–3.

Advantages: These procedures require minimal additional time to perform, require no additional equipment, and more completely test the internal hardware of the 3026. They can be used to quickly determine if the analyzer is suitable for putting into service, such as when it is first received.

If more extensive confirmation of performance is desired, do the Performance Tests, beginning on page 4–7, after doing the Self Tests just refer-

enced. Advantages: These procedures add direct checking of warranted specifica-

tions. They require more time to perform and suitable test equipment is required. (Refer to Equipment Required on page 4–9).

3026 3 GHz Real Time Spectrum Analyzer Service Manual

4–1

Performance Verification

Conventions

Throughout these procedures the following conventions apply:

Each test procedure uses the following general format: Title of Test Equipment Required Prerequisites Procedure

Each procedure consists of as many steps, substeps, and subparts as required to do the test. Steps, substeps, and subparts are sequenced as follows:

1. First Step

a. First Substep

First Subpart

Second Subpart

b. Second Substep

2. Second Step

Instructions for menu selection follow this format: FRONT PANEL BUTTON → Bezel Menu Button → Bezel Submenu Button. For example, “Press SETUP → Range → 10M–3GHz”.

NOTE. For details of buttons, keys, knob and connectors refer to Section 2 Operating Basics.

In steps and substeps, the lead-in statement in italics instructs you what to do, while the instructions that follow tell you how to do it. In the example step below, “Set the 3026 controls” by doing “Press SETUP → Range → 10M–3GHz”.

Set the 3026 controls: Press SETUP →Range → 10M–3GHz”

STOP. The symbol at the left is accompanied by information you must read to do the procedure properly.

4–2

3026 3 GHz Real Time Spectrum Analyzer Service Manual

Self Tests

Performance Verification

After you turn on the power, the analyzer performs the power-on self test by using the self test routine. Upon its completion, it displays the result on the monitor display as shown in Figure 4–1. On the bottom line of this system information, the result of the self test is displayed.

The self tests use internal routines to confirm basic functionality and proper adjustment. No test equipment is required to do these test procedures.

To view the results, do the following procedures:

1. Press the UTILITY button on the front panel.

2. Press Status of bottom bezel button.

3. Press System Info of side bezel button.

4. Check the screen message “Power on selftest : PASS”.

Figure 4–1: Display of the self test results

3026 3 GHz Real Time Spectrum Analyzer Service Manual

4–3

Performance Verification

The information is displayed on the LCD screen as shown in Figure 4–1. In this example, the following information is provided.

Hardware version : 1.03

Firmware version : 1.13

Firmware build : 11–AUG–1998 10:10:00

OS version : 2.0 – year 2000 compliant

BIOS version : BIOS version 2.5.2

Graphic hardware : CHIPS 65540/45 VGA 32KB

3026 serial number : J300112

Last full-calibration date : JUN–08–1998 18:27:52

Result of self test : PASS This displays the result of the test performed for the two ROMs, the A8

Memory, A6 DDC, and A7 FFT boards. If the result is normal, “Pass” is displayed. If the test ended abnormally, “Fail” is displayed. Note that this analyzer cannot be checked sufficiently only by this self test.

4–4

3026 3 GHz Real Time Spectrum Analyzer Service Manual

Calibration

Performance Verification

The calibration routine calibrates the amplifier gain based on the signal generator within the analyzer. This calibration should be run when the analyzer is started or during operation.

NOTE. Refer to section 5, Adjustment Procedures for full calibration.

If you perform this calibration when the analyzer is started, carry out warm-up for 20 minutes or more after the power is turned on. This causes the analyzer electrical performance to be stable. Then, run the calibration.

When the ambient temperature varies by "3 °C or more relative to that at the previous calibration when the analyzer is in operation, WARM UP or CAL NEED is displayed in red in the hardware status display area (see Figure 4–2) on the display screen. This means that the analyzer prompts you to run the calibration.

When a CAL NEED message appears, execute RF calibration.

Figure 4–2: CAL NEED indication in status indication area

3026 3 GHz Real Time Spectrum Analyzer Service Manual

4–5

Performance Verification

When UNCAL is displayed in red, run the calibration using the following procedure:

NOTE. Stop data acquisition before starting the calibration. If the calibration is run while signal acquisition is in progress, the acquisition

stops and the calibration is run next.

1. Press the START/STOP button to set for the STOP mode. (When in the STOP mode, the LED over the left of the START/STOP button goes off.)

2. Press the UTILITY button on the front panel.

3. Press the Diag/Cal bottom bezel button.

4. Press the Execute RF Cal side bezel button.

The calibration runs. It takes several seconds to complete. After the RF calibration, “CAL NEED” changes to “CAL VALID”.

4–6

3026 3 GHz Real Time Spectrum Analyzer Service Manual

Performance Tests

This section contains a collection of procedures for checking that the 3026 performs as warranted.

Table 4–1: Performance tests

Titles Page Refer to (specification)

10 MHz reference output test 4–10

10 MHz reference input test 4–11

Center frequency accuracy test 4–14

Flatness and aliasing test 4–16 1–4

Attenuator test 4–18

Span and center frequency test 4–20

Frame update interval test 4–23 1–5

Internal trigger test 4–26 1–5

External trigger test 4–30 1–5

C/N test 4–32 1–4

RF reference level test 4–34 1–4

RF flatness test 4–38 1–4

STOP. These procedures extend the confidence level provided by the basic procedures described on page 4–3. The basic procedures should be done first, then these procedures performed if desired.

3026 3 GHz Real Time Spectrum Analyzer Service Manual

4–7

Performance Verification

Prerequisites

The tests in this section comprise an extensive, valid confirmation of performance and functionality when the following requirements are met:

The cabinet must be installed on the 3026.

You must have performed and passed the procedures under Self Tests, found on page 4–3.

A signal-path compensation must have been done within the recommended calibration interval and at a temperature within ±3_ C of the present operating temperature. (If at the time you did the prerequisite Self Tests, the temperature was within the limits just stated, consider this prerequisite met.)

The 3026 must have been last adjusted at an ambient temperature between +15_ C and +25_ C, must have been operating for a warm-up period of at least 20 minutes, and must be operating at an ambient temperature between +10_ C and +40_ C. (The warm-up requirement is usually met in the course of meeting the Self Tests prerequisites listed above.)

The frequency counter (refer to page 4–9) must have been operating for a warm-up period of at least 24 hours.

4–8

3026 3 GHz Real Time Spectrum Analyzer Service Manual

Equipment Required

Table 4–2: Test equipment

Item number and description

Performance Verification

These procedures use external, traceable signal sources and signal measurement instrument to directly check warranted characteristics. The required equipment list follows this introduction.

Minimum requirements Example Purpose

1. Frequency counter Range: 10 MHz; Aging rate: <5 10

2. Signal generator 10 kHz to 3 GHz; Variable amplitude from –70 dBm to +13 dBm into 50 W; Accuracy: <"1 dB; Function: FM

3. Signal generator Output voltage: >–10 dBm at 25 MHz; SSB phase noise: <–110 dBc/Hz at 10 kHz offset

4. Function generator Frequency range: 100 Hz to 1 MHz; Amplitude range: 0 to 5 V 50

5. RF power meter 10 MHz to 3 GHz HP437B Checking reference level

6. RF power sensor 10 MHz to 3 GHz; RF Flatness: <3 % HP8481A Checking reference level

7. RF step attenuator 10 dB step; Accuracy: <3%; Range: >1 GHz

8. PC

9. BNC cable 50 W, 36 in, male to male BNC

10. N–N cable

11. GPIB cable

12. Terminator Impedance: 50 W; connectors: female

13. RF flatness check

14. SG flatness floppy disk 1Created or updated with the proce-

(two required)

program

Used for the RF flatness test only. The test is performed by running the RF flatness check program (3026FREQ.EXE in LabVIEW) on PC. The file can be downloaded from the Tektronix webpage found at http://www.tektronix.com.

Windows 95 or 98; GPIB board; LabVIEW version 5.0 or later (recommended)

connectors

50 W, 36 in, male to male N connectors

2m, double-shielded Tektronix part number

BNC input, male BNC output

LabVIEW version 5.0 or later (recommended)

dures described on page 5–11

–9

/day

p-p

into

Anritsu MF1603A option 01 Checking frequency

HP8648C option 1E5 Checking RF flatness

Anritsu MG3641A Checking C/N

Sony/Tektronix AFG310 Checking frame update

interval

HP8496B Checking reference level

National Instruments LabVIEW and GPIB board

Tektronix part number 012-1341-00

012-0991-00

Tektronix part number 011-0049-01

3.5 inch, 720 K or 1.44 Mbyte, DOS-compatible floppy disk

Software-based test

Signal interconnection

Software-based test

Signal termination for the 10 MHz reference output test

Checking RF flatness

Storing flatness correction data for the HP8648 signal generator

3026 3 GHz Real Time Spectrum Analyzer Service Manual

4–9

Performance Verification

10 MHz Reference Output Test

This procedure checks whether 10 MHz reference output frequency error is within the specified range.

Equipment Required

Prerequisites See page 4–8

3026 (rear)

10 MHz REF

OUTPUT

One frequency counter (Item 1)

One 50 WBNC coaxial cable (Item 9)

One 50 Wterminator (Item 12)

Frequency counter

50 W terminator

50 W BNC coaxial cable

Figure 4–3: Initial test hookup

1. Install the test hookup and preset the instrument controls:

4–10

a. Hook up the frequency counter: Connect 10 MHz REF OUTPUT of the

3026 through a 50 W precision coaxial cable and a 50 W precision terminator to INPUT-A of the counter. See Figure 4–3.

b. Set the counter controls:

Function A-FREQ. . . . . . . . . . . . . . . . . .

Gate time 2 s. . . . . . . . . . . . . . . . .

2. Check the frequency: Check that the frequency of the counter shows

10 MHz "1 Hz.

3. Disconnect the hookup: Disconnect the cable at 10 MHz REF OUTPUT.

3026 3 GHz Real Time Spectrum Analyzer Service Manual

10 MHz Reference Input Test

This procedure checks whether 10 MHz reference input works correctly.

Performance Verification

Equipment Required

Prerequisites See page 4–8

Signal generator

Output

One signal generator (Item 2)

One 50 W BNC coaxial cable (Item 9)

One 50 W N–N coaxial cable (Item 10)

3026

RF input

50 W N–N coaxial cable

Figure 4–4: Initial test hookup

1. Install the test hookup and preset the instrument controls: a. Set the 3026 controls:

Press the START/STOP button to stop data acquisition.

Press DISPLAY:

Press SETUP → Range → 10M–3GHz.

Press SETUP → FFT → Window Blackman-Harris.

Press SETUP → FFT → FFT Pts and select 1024.

Press the FREQ button and set the frequency using the keypad.

Freq 1000 MHz. . . . . . . . . . . . . . . . . . . . .

Press the SPAN button and set the span using the keypad.

Span 200 kHz. . . . . . . . . . . . . . . . . . . . .

3026 3 GHz Real Time Spectrum Analyzer Service Manual

(Spectrum) button.

4–11

Performance Verification

Press the REF LEVEL button and set the reference level using the keypad.

Ref 0 dBm. . . . . . . . . . . . . . . . . . . . . .

b. Set the signal generator controls:

Frequency 1000 MHz. . . . . . . . . . . . . . . . .

Amplitude –10 dBm. . . . . . . . . . . . . . . .

RF Output On. . . . . . . . . . . . . . . .

c. Hook up the generator: Connect the generator output through a 50

N–N coaxial cable to the 3026 RF INPUT. See Figure 4–4.

2. Acquire data: a. Press the ROLL/BLOCK button to select the Roll mode. b. Press the START/STOP button to start data acquisition.

3. Check the waveform display: Check that the spectrum is displayed at the

center approximately.

4. Modify the 3026 controls: Press SETUP → External Gain/Osc → Ref. Osc and select External.

5. Check the waveform display: Check that the spectrum shifts from the center.

6. Modify the test hookup: Connect the 10 MHz reference output of the

generator through a 50 W BNC coaxial cable to 10 MHz REF INPUT of the

3026. See Figure 4–5.

3026 (rear)

Signal generator (rear)

4–12

10 MHz ref. output

50 W BNC coaxial cable

Figure 4–5: Modified test hookup

3026 3 GHz Real Time Spectrum Analyzer Service Manual

10 MHz REF

INPUT

Performance Verification

7. Check the waveform display: Check that the spectrum returns to the original

center position approximately.

8. Disconnect the hookup: a. Disconnect the cables at RF INPUT and 10 MHz REF INPUT. b. Press SETUP → External Gain/Osc → Ref. Osc and select Internal.

3026 3 GHz Real Time Spectrum Analyzer Service Manual

4–13

Performance Verification

Center Frequency Accuracy Test

This procedure checks the center frequency error is within the specified range.

Frequency counter (rear)

10 MHz ref. output To 10MHz ref. input (rear)

50 W BNC coaxial cable

Equipment Required

Prerequisites See page 4–8

One frequency counter (Item 1)

One signal generator (Item 2)

One 50 W BNC coaxial cable (Item 9)

One 50 W N–N coaxial cable (Item 10)

Signal generator

Figure 4–6: Initial test hookup

Output

3026

RF input

50 W N–N coaxial cable

4–14

1. Install the test hookup and preset the instrument controls: a. Hook up the frequency counter and the signal generator: Connect the

10 MHz reference output of the counter through a 50 W BNC coaxial cable to 10 MHz reference input of the signal generator. See Figure 4–6.

b. Set the signal generator controls:

Frequency 5 MHz. . . . . . . . . . . . . . . . .

Amplitude –10 dBm. . . . . . . . . . . . . . . .

RF Output On. . . . . . . . . . . . . . . .

c. Hook up the signal generator: Connect the output of the signal generator

through a 50 W N–N coaxial cable to RF INPUT of the 3026. See Figure 4–6.

3026 3 GHz Real Time Spectrum Analyzer Service Manual

d. Set the 3026 controls:

Press the START/STOP button to stop data acquisition.

Performance Verification

Press DISPLAY:

Press SETUP → Range → 50–10MHz.

Press FREQ button and set the frequency using the keypad.

Freq 5 MHz. . . . . . . . . . . . . . . . . . . . .

Press SPAN button and set the span using the keypad.

Span 100 Hz. . . . . . . . . . . . . . . . . . . . .

Press REF LEVEL button and set the reference level using the keypad.

Ref 0 dBm. . . . . . . . . . . . . . . . . . . . . .

2. Acquire data: a. Press the ROLL/BLOCK button to select the Roll mode. b. Press the START/STOP button to start data acquisition.

3. Check the frequency: a. Press MARKER → Peak Find → Highest Peak to place the marker on

the peak signal.

(Spectrum) button.

b. Read the frequency on the screen. c. Check that the frequency is within a range of 5 MHz "2.7 Hz.

4. Disconnect the hookup: a. Disconnect the N –N cable at the 3026 RF INPUT. b. Disconnect the BNC cable at 10 MHz reference input of the generator.

3026 3 GHz Real Time Spectrum Analyzer Service Manual

4–15

Performance Verification

Flatness and Aliasing Test

This procedure checks the flatness and aliasing errors are within the specified range.

Equipment Required

Prerequisites See page 4–8

Signal generator

Output

One signal generator (Item 2)

One 50 W N–N coaxial cable (Item 10)

3026

RF input

50 W N–N coaxial cable

Figure 4–7: Initial test hookup

1. Install the test hookup and preset the instrument controls: a. Set the 3026 controls:

4–16

Press the START/STOP button to stop data acquisition.

Press DISPLAY:

Press SETUP → Range → 50–10MHz.

Press SETUP → FFT → FFT Pts and select 1024.

Press SETUP → FFT → Window Blackman-Harris.

Press the FREQ button and set the frequency using the keypad.

(Spectrum) button.

Freq 5 MHz. . . . . . . . . . . . . . . . . . . . .

Press the SPAN button and set the span using the keypad.

Span 10 MHz. . . . . . . . . . . . . . . . . . . . .

3026 3 GHz Real Time Spectrum Analyzer Service Manual

Performance Verification

Press the REF LEVEL button and set the reference level using the keypad.

Ref 0 dBm. . . . . . . . . . . . . . . . . . . . . .

b. Set the signal generator controls:

Frequency 1 MHz. . . . . . . . . . . . . . . . .

Amplitude –10 dBm. . . . . . . . . . . . . . . .

RF output On. . . . . . . . . . . . . . . . .

c. Hook up the generator: Connect the output of the generator through

a 50 W N–N coaxial cable to RF INPUT of the 3026. See Figure 4–7.

2. Acquire data: a. Press the ROLL/BLOCK button to select the Roll mode. b. Press the START/STOP button to start data acquisition.

3. Measure peak: Change the frequency of the signal generator from 1 MHz to

9 MHz in 1 MHz step, and read the peak value with the marker.

a. Set the frequency of the signal generator (to 1 MHz initially). b. Press MARKER → Peak Find → Highest Peak to place the marker on

the peak signal.

c. Read the peak level and note it. d. Repeat a to c for the frequency 1 MHz to 9 MHz in 1 MHz step.

4. Check the flatness: Check that the difference between the maximum and

minimum levels of each frequency is 2.0 dB or smaller.

5. Modify the signal generator settings:

Frequency 16 MHz. . . . . . . . . . . . . . . . .

6. Check the aliasing: Check that the maximum value of the frequency components between 9 MHz and 10 MHz is –60 dBm or lower.

7. Modify the signal generator settings:

Frequency 24 MHz. . . . . . . . . . . . . . . . .

8. Check the aliasing: Check that the maximum value of the frequency components between 1 MHz and 2 MHz is –60 dBm or lower.

9. Disconnect the hookup: Disconnect the cable at RF INPUT.

3026 3 GHz Real Time Spectrum Analyzer Service Manual

4–17

Performance Verification

Attenuator Test

This procedure checks the attenuator error is within the specified range.

Equipment Required

Prerequisites See page 4–8

Signal generator

Output

One signal generator (Item 2)

One 50 W N–N coaxial cable (Item 10)

3026

RF input

50 W N–N coaxial cable

Figure 4–8: Initial test hookup

1. Install the test hookup and preset the instrument controls: a. Set the 3026 controls:

4–18

Press the START/STOP button to stop data acquisition.

Press DISPLAY:

Press SETUP → Range → 50–10MHz.

Press SETUP → FFT → FFT Pts and select 1024.

Press SETUP → FFT → Window Blackman-Harris.

Press the FREQ button and set the frequency using the keypad.

(Spectrum) button.

Freq 2.5 MHz. . . . . . . . . . . . . . . . . . . . .

Press the SPAN button and set the span using the keypad.

Span 5 MHz. . . . . . . . . . . . . . . . . . . . .

Press the REF LEVEL button and set the reference level using the keypad.

Ref 0 dBm. . . . . . . . . . . . . . . . . . . . . .

3026 3 GHz Real Time Spectrum Analyzer Service Manual

Performance Verification

b. Set the signal generator controls:

Frequency 2.5 MHz. . . . . . . . . . . . . . . . .

Amplitude –20 dBm. . . . . . . . . . . . . . . .

RF output On. . . . . . . . . . . . . . . . .

c. Hook up the generator: Connect the output of the generator through

a 50 W N–N coaxial cable to RF INPUT of the 3026. See Figure 4–8.

2. Acquire data: a. Press the ROLL/BLOCK button to select the Roll mode. b. Press the START/STOP button to start data acquisition.

3. Measure peak: Press MARKER → Peak Find → Highest Peak to place the

marker on the peak signal. Read the peak level and note it.

4. Modify the 3026 control and check the level: a. Change the reference level to one of the settings listed in Table 4–3. b. Press MARKER → Peak Find → Highest Peak to place the marker on

the peak signal, and read the peak level.

c. Check that the difference between this peak level and the one noted at

step 3 is within "0.5 dB.

d. Repeat substeps a through c until all reference level settings listed in

Table 4–3 are checked.

e. Make sure that the reference level is set to –9 dBm for the next steps.

Table 4–3: Level accuracy

Reference level setting Level accuracy limits

–3 dBm ±0.5 dB –5 dBm ±0.5 dB –9 dBm ±0.5 dB

5. Modify the signal generator controls:

Amplitude –5 dBm. . . . . . . . . . . . . . . .

6. Check the A/D converter overload: a. Check that the message “OVERLOAD” is displayed on the 3026 screen. b. Turn off the generator output, and check the message disappears.

3026 3 GHz Real Time Spectrum Analyzer Service Manual

4–19

Performance Verification

Span and Center Frequency Test

This procedure checks the span and the center frequency errors are within the specified range.

Equipment Required

Prerequisites See page 4–8

Signal generator

Output

One signal generator (Item 2)

One 50 W N–N coaxial cable (Item 10)

3026

RF input

50 W N–N coaxial cable

Figure 4–9: Initial test hookup

1. Install the test hookup and preset the instrument controls: a. Set the 3026 controls:

4–20

Press the START/STOP button to stop data acquisition.

Press the ROLL/BLOCK button to select the Roll mode.

Press DISPLAY:

Press SETUP → Range → 50–10MHz.

Press SETUP → FFT → FFT Pts and select 1024.

Press SETUP → FFT → Window Blackman-Harris.

Press the REF LEVEL button and set the reference level using the

(Spectrum) button.

keypad.

Ref 0 dBm. . . . . . . . . . . . . . . . . . . . . .

3026 3 GHz Real Time Spectrum Analyzer Service Manual

Tektronix 3026 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Table of Contents

Specifications

Operating Information

Theory of Operation

Performance Verification

Adjustment Procedures

Maintenance

Options

Electrical Parts List

Diagrams

Mechanical Parts List

List of Figures

List of Tables

General Safety Summary

Service Safety Summary

Preface

Manual Structure

Manual Conventions

Finding Other Information

Contacting Tektronix

Introduction

Performance Check Interval

Strategy for Servicing

Product Overview

Specifications

Warranted Characteristics

Typical Characteristics

Nominal Traits

Certification and Compliances

Installation

Supplying Operating Power

Operating Environment

Applying and Interrupting Power

Repackaging Instructions

Installed Options

Operating Instructions

Preparations

Setup

Turning On the Power

Observing Spectrum

Dividing the Display Area and Changing the Display Mode

Using the Block Mode to Acquire Data

Using Dual Markers

Trigger and Mask Pattern

Changing the Display Frame

Shutting Power Off

Theory of Operation

Module Overview

Performance Verification

Conventions

Self Tests

Calibration

Performance Tests

Prerequisites

Equipment Required

Center Frequency Accuracy Test

Flatness and Aliasing Test

Attenuator Test

Span and Center Frequency Test