Tektronix 2715 Manuel utilisateur

Service Manual

2715

Spectrum Analyzer

Volume 1

070-9096-06

This document supports firmware version

12.01.95 and above.

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 all safety summaries prior to

performing service.

www.tektronix.com

Tektronix 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.

Tektronix, Inc., P.O. Box 500, Beaverton, OR 97077

TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.

WARRANTY

Tektronix warrants that this product will be free from defects in materials and workmanship for a period of one (1) year

from the date of shipment. If any such product proves defective during this warranty period, Tektronix, 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 Tektronix, 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

Tektronix 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. Tektronix shall not be obligated to furnish service under this warranty a) to repair damage resulting

from attempts by personnel other than Tektronix representatives to install, repair or service the product; b) to repair

damage resulting from improper use or connection to incompatible equipment; or c) 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 WITH RESPECT TO THIS PRODUCT IN LIEU OF ANY

OTHER WARRANTIES, EXPRESSED OR IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY

IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

TEKTRONIX’ RESPONSIBILITY TO REPAIR 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.

2715 Spectrum Analyzer Service Manual i

Table of Contents

General Safety Summary ix...................................

Service Safety Summary xi....................................

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

Specifications

Electrical Characteristics 1-1..........................................

Operating Information

Instrument Description 2-1............................................

Conformance to Industry Standards 2-2..................................

Product Service 2-2..................................................

Instrument Construction 2-3...........................................

Installation and Preparation for Use 2-3..................................

Power Cord 2-3.....................................................

Replacing the Fuse 2-4...............................................

Selected Components 2-4.............................................

Assembly and Circuit Numbering 2-4...................................

Accessories 2-4.....................................................

Menus 2-4.........................................................

SWP/TRG Menu Structure 2-6.........................................

UTIL Menu Structure

(1 of 2) 2-7.....................................................

UTIL Menu Structure

(2 of 2) 2-8.....................................................

MRK/FREQ Menu Structure 2-8.......................................

CATV/APPL CATV Measurements Page 1 Menu Structure (1 of 3) 2-9........

CATV/APPL CATV Measurements Page 1 Menu Structure (2 of 3) 2-10........

CATV/APPL CATV Measurements Page 1 Menu Structure (3 of 3) 2-11........

CATV/APPL CATV Measurements Page 2 Menu Structure (1 of 2) 2-12........

CATV/APPL CATV Measurements Page 2 Menu Structure (2 of 2) 2-13........

CATV/APPL Applications Menu Structure 2-14............................

DEMOD Menu Structure 2-14..........................................

DSPL Menu Structure 2-15............................................

USER DEF Menu Structure 2-15........................................

INPUT Menu Structure 2-16...........................................

Theory of Operation

Block Diagram Description 3-1........................................

Center Frequency Control 3-5.........................................

1st LO Buffer 3-7...................................................

Sweep 3-7.........................................................

Display System 3-8..................................................

Circuit Description 3-9........................................

Attenuator and 1st Converter 3-9.......................................

RF Mother Board and Phase Locked 2nd LO 3-12..........................

Table of Contents

ii 2715 Spectrum Analyzer Service Manual

1st LO Interface, 1st LO, and 1st LO Buffer Amplifier 3-14..................

Reference Oscillator 3-16..............................................

Phase Lock Assembly (Center Frequency Control System) 3-21...............

Variable Resolution Module 3-33........................................

RF Options 3-35.....................................................

Log Amplifier 3-38...................................................

Display Storage 3-40..................................................

Microprocessor 3-60..................................................

GPIB, RS-232, Real Time Clock, NVRAM, and Gated Measurement Functions 3-74

Video Demodulator 3-78...............................................

Sweep 3-80.........................................................

Front Panel 3-83.....................................................

Power Supply (Primary and Secondary) 3-87..............................

Power Supply (Display) 3-91...........................................

Performance Verification

Incoming Inspection Test 4-1..........................................

Verification of Tolerance Values 4-1....................................

History Information 4-1..............................................

Equipment Required 4-2..............................................

Power-Up Procedure 4-3..............................................

Front Panel Operation 4-4.............................................

Performance Check Procedure 4-4......................................

Adjustment Procedures

Static Discharge Precautions 5-1.......................................

Recommended Test Equipment 5-2.....................................

Preparation 5-4.....................................................

Adjustments Requiring Flatness Correction 5-4...........................

Instrument Bottom View 5-5..........................................

Adjustments 5-6....................................................

Maintenance

Static Sensitive Components 6-1.......................................

Preventive Maintenance 6-2...........................................

Troubleshooting 6-6.................................................

Cal Debug Flags 6-8.................................................

Corrective Maintenance 6-13...........................................

Assembly Replacement Requiring Flatness Correction 6-17...................

Removing and Replacing Assemblies and Subassemblies 6-17................

Maintenance Adjustments 6-33.........................................

Options

Replaceable Electrical Parts

Diagrams

Replaceable Mechanical Parts

Table of Contents

2715 Spectrum Analyzer Service Manual iii

List of Figures

Figure 1-1: Typical Accuracy Limits for Carrier-to-Noise

Measurement 1-7..........................................

Figure 1-2: Typical Accuracy Limits for CTB Measurement 1-7......

Figure 1-3: Typical Accuracy Limits for Nongated CSO

Measurement 1-8..........................................

Figure 1-4: Typical Accuracy Limits for Gated CSO

Measurement 1-8..........................................

Figure 1-5: Typical ACL Measurement Limits for 2 dB Accuracy 1-9..

Figure 1-6: Typical D/U Measurement Range Limits for

2 dB Accuracy 1-9.........................................

Figure 1-7: Typical Digital Signal CSO Measurement Range Limit

for 2 dB Accuracy 1-10......................................

Figure 1-8: Typical Digital Signal CTB Measurement Range

Limit for 2 dB Accuracy 1-10.................................

Figure 2-1: 2715 Front Panel Keys 2-5............................

Figure 3-1: Main Block Diagram 3-2.............................

Figure 3-2: Display System Diagram 3-8..........................

Figure 3-3: Attenuator and 1st Converter Diagram 3-10..............

Figure 3-4: Equivalent Circuit for the Bandpass (4 Cavity)

Filter 3-11.................................................

Figure 3-5: Block Diagram of RF Mother Board 3-12................

Figure 3-6: 1st LO Interface and 1st LO Diagram 3-14...............

Figure 3-7: 1st LO Buffer Amplifier Diagram 3-15..................

Figure 3-8: Reference Oscillator Diagram 3-17......................

Figure 3-9: Crystal Heater and 15 V Regulation Circuit 3-18..........

Figure 3-10: Oscillator AC Equivalent 3-19........................

Figure 3-11: Oscillator DC Equivalent 3-20........................

Figure 3-12: Phase Lock Center Frequency Control

Configuration for Wide Spans (Unlocked, Sweep Main Coil) 3-28..

Figure 3-13: Phase Lock Center Frequency Control Configuration

for Moderate Spans (Unlocked, Sweep FM Coil) 3-29.............

Figure 3-14: Phase Lock Center Frequency Control Configuration

for Narrow Spans (Locked, Sweep VCO) 3-30...................

Figure 3-15: Variable Resolution Module Diagram 3-34..............

Figure 3-16: RF Options Diagram 3-36............................

Table of Contents

iv 2715 Spectrum Analyzer Service Manual

Figure 3-17: Timing Diagram for a Typical Write to the Control

Figure 3-18: Timing Diagram of a Typical Sweep for the Horizontal

Tracking A/D Converter 3-51.................................

Figure 3-19: Sequence of Events When Writing Data to the

Waveform Memory 3-54.....................................

Figure 3-20: How a Vertical Scan is Performed 3-56.................

Figure 3-21: The Display of a Single Vector of a Waveform 3-57.......

Figure 3-22: A Single Column of Character Dots 3-57................

Figure 3-23: Vertical Output Integrator 3-58.......................

Figure 3-24: Microprocessor Block Diagram 3-61...................

Figure 3-25: Microprocessor Counter System (CPU) 3-62.............

Figure 3-26: Front Panel Block Diagram 3-83......................

Figure 3-27: How the Debounce Circuit Reacts to Key Closure 3-85....

Figure 3-28: Power Supply Primary Block Diagram 3-88.............

Figure 3-29: Display Amplifiers Block Diagram 3-91................

Figure 4-1: 3rd Order IM Test Setup (25 MHz Separation) 4-17.......

Figure 4-2: Harmonic Distortion Test Equipment Setup 4-18..........

Figure 4-3: 1 dB Compression Point Test Setup 4-20.................

Figure 4-4: Accessory Connector (J103) 4-22.......................

Figure 4-5: Test Equipment Setup for Checking Return Loss 4-28.....

Figure 4-6: Test Signal on Video Line 17 4-32.......................

Figure 4-7: Video Gating Check Waveform (NTSC Illustrated) 4-34....

Figure 4-8: IF Gating Check Waveform (NTSC Illustrated) 4-35......

Figure 5-1: Instrument Bottom View 5-5..........................

Figure 5-2: Display Storage Board Adjustment Locations 5-13........

Figure 5-3: Properly Adjusted Checkerboard Pattern 5-14...........

Figure 5-4: Locked 2nd LO and 5 MHz Bandpass Filter

Adjustments 5-16...........................................

Figure 5-5: Phase Lock CFC Module Adjustment and Test Point

Locations 5-17.............................................

Figure 5-6: Log Board Adjustment and Test Point Locations 5-21.....

Figure 5-7: CAL Level Adjustment on Reference Oscillator Board 5-26.

Figure 5-8: RF Option Adjustment Locations 5-28..................

Figure 5-9: Variable Resolution Module Adjustment Locations 5-29....

Figure 5-10: Flatness adjustment test setup (all instruments

except Option 50) 5-34.......................................

Table of Contents

2715 Spectrum Analyzer Service Manual v

Figure 5-11: Presetting the Flatness Adjustments on the

Log Board 5-35............................................

Figure 5-12: Gain Step Reference Test Setup 5-36...................

Figure 5-13: Internal Ref Ampltd Test Setup 5-38...................

Figure 5-14: SW410 on the Reference Oscillator Board 5-39..........

Figure 5-15: Adjustment and Test Point Locations on the

Sweep Board 5-41..........................................

Figure 5-16: Typical FM Adjustment Waveform 5-42................

Figure 5-17: HPF Tuning Criteria (at TP110M) 5-45.................

Figure 5-18: Typical Video Waveform 5-48.........................

Figure 5-19: Horizontal Sync Output 5-49.........................

Figure 5-20: Vertical Sync Output Waveform 5-50..................

Figure 5-21: E/O Output Waveform 5-51..........................

Figure 5-22: Test Equipment Characterization Using a Dual

Channel Power Meter for split75 5-59..........................

Figure 5-23: Test Equipment Characterization Using a

Single Channel Power Meter to Characterize the Power Meter

Output for split75 5-59......................................

Figure 5-24: Test Equipment Characterization Using a

Single Channel Power Meter to Characterize the DUT

Output for split75 5-59......................................

Figure 5-25: Test Equipment Characterization Using a Dual

Channel Power Meter for split50 5-60..........................

Figure 5-26: Test Equipment Characterization Using a

Single Channel Power Meter to Characterize the Power Meter

Output for split50 5-60......................................

Figure 5-27: Test Equipment Characterization Using a

Single Channel Power Meter to Characterize the DUT

Output for split50 5-60......................................

Figure 5-28: Flatness Test Setup (75 W) 5-62.......................

Figure 5-29: Flatness Test Setup (50 W) 5-62.......................

Figure 6-1: Main Extender and Secondary Extender 6-4............

Figure 6-2: Signal Steering Square Pins 6-5.......................

Figure 6-3: Surface Mounted Components Lead Configuration 6-14...

Figure 6-4: Top View of Assemblies and RF Deck 6-18...............

Figure 6-5: Assemblies Seen from the Bottom of the Spectrum

Analyzer 6-19..............................................

Figure 6-6: Removing the Front Panel 6-22........................

Figure 6-7: Locations of J510 and J550 on the Phase Lock

Assembly 6-23.............................................

Table of Contents

vi 2715 Spectrum Analyzer Service Manual

Figure 6-8: Connector Locations on the RF Deck 6-24...............

Figure 6-9: RF Deck Screws and Nuts 6-25.........................

Figure 6-10: Fan and Fan Mounting Springs Detail 6-29.............

Figure 6-11: Power Supply Assembly Removal (Bottom View) 6-31....

Figure 6-12: Removing Power Supply Attaching Nuts 6-32...........

Figure 6-13: Location of R602 on the Phase Lock CFC Board 6-34.....

Figure 7-1: Option 15 Installation 7-3............................

Figure 10-1: Cabinet 10-7.......................................

Figure 10-2: Front Panel 10-11....................................

Figure 10-3: Power Supply 10-15..................................

Figure 10-4: Chassis #1 10-18.....................................

Figure 10-5: Chassis #2 10-22.....................................

Figure 10-6: Accessories 10-25....................................

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