Tektronix 2707 User manual

Instruction Manual

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.

Instrument

Serial

Numbers

Each instrument manufactured by Tektronix has

a

serial number on a panel insert or tag, or stamped on the

chassis. The first letter in the serial number designates the country of manufacture. The last five digits of the

serial number are assigned sequentially and are unique to each instrument. Those manufactured in the

United States have six unique digits. The country of manufacture is identified as follows:

BOl 0000

Tektronix, Inc., Beaverton, Oregon, USA

E200000

Tektronix United Kingdom,

Ltd.,

London

J300000 Sonyflektronix, Japan

H700000

Tektronix Holland,

NV,

Heerenveen, The Netherlands

Instruments manufactured for Tektronix by external vendors outside the United States are assigned a two digit

alpha code to identify the country of manufacture

(e.g., JP for Japan, HK for Hong Kong, IL for Israel, etc.).

Tektronix, Inc.,

PO.

Box 500, Beaverton, OR 97077

Printed in U.S.A.

Copyright

O

Tektronix, Inc.,

1993.

by

U.S. and foreign

patents, issued and pending. The following are registered trademarks: TEKTRONIX,

TEK,

TEKPROBE, and

SCOPE-MOBILE.

-m

..........

Table

of

Contents

,...

...,o-

Preface

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

General Safety Summary

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

Servicing Safety

Summary

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

Introduction

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

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

Introduction

Accessories

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

Options

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

e*.

xi

xiii

xvii

Getting

Started

4

.

........

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

Getting Started

.-.

2-1

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

Mechanical Connections

2-

1

Preparing the Spectrum Analyzer

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

2-1

.

.,,,,

,

Preparing the External Tracking Generator.

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

2-1

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

...

-

Attaching the Instruments Together

2-3

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

Electrical Connections

2-3

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

.

.q

Using the External Tracking Generator

2-4

..*

a

~unctional check

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

d

2-6

---.

.

...

-ff-

.......

k

Operation

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

Operation

Controls

and

Connectors

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

Front Panel

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

Rearpanel

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

Power Requirements

3-3

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

Power Cord Information

3-3

Operating Voltage

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

3-3

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

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

Power On

..

3-3

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

External Tracking Generator Control

3-4

2707

instruction

Manual

i

Table of Contents

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

~zernal Tracking Generator Operation

3-5

fl

Initialization

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

3-5

Turning the Tracking Generator On and

Off

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

3-5

Normalizing the External Tracking Generator

.............. 3-5

Setting the External Tracking Generator Amplitude

........

3-7

Setting the TG Variable Level

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

3-8

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

Adjusting the Tracking 3-8

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

Using External

Amplification/Attenuation

3-10

A Practical Example

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

3-10

Specification

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

NominalTraits

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

Warranted Characteristics

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

npical Characteristics

Performance

Verification

Performance Verification Procedures

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

5-1

.

P

.

Prerequisites

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

...

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

5-1

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

Equipment Required 5-1

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

Performance Verification Procedures

5-2

.

-

d

Power-On Procedure

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

5-2

Check Frequency Range

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

5-4

Check Tracking (Frequency Offset)

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

5-5

Check Output Level Range and Accuracy

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

5-6

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

Check

TG

Variable Level 5-8

Check VSWR

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

5-9

Check Tracking Generator Flatness ......................

5-10

Check System Flatness

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

5-12

Check Characterized Flatness

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

5-13

Check Spurious Signals

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

5-14

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

Check System Dynamic Range

5-16

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

Check LO Output 5-17

Check Auxiliary Signals

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

5-17

&

ii

Contents

Table

of

Contents

C^

.

Adjustment Procedure

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

Adjustment Procedure

..

Requirements for Performance

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

....

Personnel

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

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

Warm-up Period

Access

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

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

Test Equipment

Preparation

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

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

Adjustment Instructions

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

Adjust

105.5

MHz Oscillator Balance

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

Adjust Phase Lock

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

Adjust Flatness

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

Adjust Attenuator Flatness

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

Perform Tracking Generator Normalizations

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

Do Performance Verification Procedure

Service

Information

.

-7-

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

Maintenance Information

Additional Servicing information

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

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

Preventing Electrostatic Discharge

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

Precautions

Susceptibility to Electrostatic Discharge

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

Obtaining Replacement Parts

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

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

Parts Repair and Return Program

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

Component Replacement Information

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

Surface-mounted Components

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

Replacing Surface-mounted Components

Diode

Markings

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

Transistor and Integrated Circuit Configurations

...........

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

Resistor

Values

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

Capacitor Marking

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

Multiple Terminal (Harmonica) Connectors

...........

Soldering Techniques for Leaded Components

......

Replacing the Square Pin for the Multipin Connectors

Inspection and Cleaning

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

7-9

Inspection

and

Cleaning Procedures

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

7-9

Inspection-Exterior

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

7-9

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

Cleaning Procedure-Exterior

-

7-1

0

.

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

Inspection-Interior 7-1

0

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

Cleaning Procedurelnterior

id$al&L

...

m4

.

-mc,

.

2707

Instruction

Manual

I

.

Jll

.

**-

.

.-.

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

Removal and Installation 7-13

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

Equipment Required

Procedures

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

Top and Bottom Covers

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

Power Supply Module

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

Power Supply Interconnect Board

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

Replacing Semirigid Coaxial Cables

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

Tracking Generator Module

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

Tracking Generator Module Disassembly

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

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

Troubleshooting

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

Troubleshooting Aids

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

Diagrams

Circuit Board Illustrations and Look-up Tables

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

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

General Troubleshooting Techniques

Theory of Operation

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

Circuit Description 8-1

Logic Conventions

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

8-1

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

Instrument Overview

8-1

Main Power Supply Module

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

8-2

.-.

Power

Supply

Interconnect Board

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

8-2

Tracking Generator Module

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

8-2

J

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

Detailed Circuit Description

Main Power Supply Module

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

8-5

Power Supply Interconnect Board

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

8-5

Tracking Generator Module

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

8-6

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

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

Isolation Amplifiers

..

8-7

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

Phase Lock Loop

8-8

TG

Amplifier

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

8-12

TG Interface

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

8-13

Replaceable Electrical

Parts

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

Replaceable Electrical Parts

Schematic Diagrams

and

Circuit Board Illustrations

Schematic Diagrams and Circuit Board Illustrations

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

iv

Contents

Table

of

Contents

r-.

Replaceable Mechanical

Parts

Replaceable Mechanical Parts

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

lndex

Index

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

2707

lndruction Manual

v

Table

of Contents

vi

Contents

List

of

Figures

Figure 2-1

:

Attaching the External Tracking Generator to the

Spectrum Analyzer

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

Figure 2-2: lnterconnections Between External Tracking

Generator and Spectrum Analyzer

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

Figure 2-3: Saving the Reference Level

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

Figure 2-4: Display of Filter Response

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

Figure 2-5: Bandpass Filter Response Curve with Reference Level

.

Figure 3-1

:

Front Panel

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

Figure 3-2: Rear Panel

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

Figure 3-3: Bandpass Filter Response Using B. C MINUS A Mode

. .

Figure 5-1

:

lnterconnections Between External Tracking

Generator and Controlling Spectrum Analyzer

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

Figure 5-2: Test Setup For Measuring Return Loss

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

Figure 5-3: Test Setup For Measuring Tracking Generator Flatness

.

Figure 5-4: Harmonic Spur Distribution Near the 100 kHz

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

Fundamental (1 0 dB Per Division Display)

Figure 6-1

:

Locations of Semirigid Cable Connectors on

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

Tracking Generator Module

Figure 6-2: Adjustment Locations on the Phase Lock Loop Board

.

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

Figure 6-3: Special Probe Construction

Figure 6-4: Adjustment Locations on the Interface Board

..........

Figure 6-5: Twisted Pair and Wire-Loop Capacitor Locations

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

on the Attenuator (Amplifier Board)

Figure 7-1

:

Surface-mounted Components Lead Configuration

....

..

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

Figure 7-2: Diode Polarity Markings

..

Figure 7-3: Multipin (Harmonic) Connectors

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

Figure 7-4: Screws Securing Tracking Generator Module

.........

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

Figure 7-5: TG Isolation Amplifiers Board Removal

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

Figure 7-6: TG Phase Lock Loop Board Removal

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

Figure 7-7: TG Amplifier Board Removal

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

Figure 8-1

:

Tracking Generator Block Diagram

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

Figure 8-2: Isolation Amplifier Block Diagram

...........

Figure 8-3: 21 10

MHz

Phase Lock Loop Block Diagram

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

Figure 8-4: 105.5

MHz

Oscillator AC Equivalent

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

Figure 8-5:

RF

Amplifier Block Diagram

.......

Figure 8-6: Tracking Generator Interconnect Block Diagram

2707

Instruction

Manual

vii

List

of

Figures

Figure 10-1

:

Graphic Items and Special Symbols Used

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

in This Manual

Figure 10-2: Locating Components on Circuit Board or

Schematic Diagram

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

1 0-3

Figure 10-3: A20 Power Supply Interconnect Board

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

10-4

Figure 10-4: A24A1 TG Interface Board

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

10-6

Figure 10-5: A24A2 TG Phase Lock Loop Board

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

10-8

Figure 10-6: A24A3 TG Isolation Amps Board

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

10-1 0

Figure 10-7: A24A4 TG Amplifier Board

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

10-1 2

viii

List

of

Figures

List

of

Tables

Table

1-1

:

Standard Accessories

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

1-2

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

Table

1-2:

Optional Power Cords

1-3

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

Table

3-1

:

DEMODrrG Menu

3-4

Table

4-1

:

Nominal Traits-General

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

Table

4-2:

Nominal Traits-Input Port and Output Port

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

Table

4-3:

Nominal Traits-Power Requirements and Line Fuse

....

Table

4-4:

Nominal Traits-External Connector Signals

...........

Table

4-5:

Nominal Traits-Mechanical

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

Table

4-6:

Certifications and Compliances

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

Table

4-7:

Safety Certification Compliance

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

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

Table

4-8:

Safety Standards

Table

4-9:

Warranted Characteristics-Tracking Generator System

Table

4-1

0: Warranted

Characteristics.Environmental.

Safety.

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

and Reliability

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

Table

4-1 1

:

Typical Characteristics-System

...

Table

4-1

2:

Typical Characteristics-External Connector Signals

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

Table

5-1

:

Equipment Required

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

Table

6-1

:

Equipment Required

.........

Table

7-1

:

Relative Susceptibility to Static Discharge Damage

7-3

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

Table

7-2:

External Inspection Check List

7-10

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

Table

7-3:

Internal Inspection Check List

7-11

....

Table

7-4:

Tools Required for Module Removal and Installation

7-13

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

Table

8-1

:

Control Bits

8-15

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

Table

8-2:

Typical Power Consumption

8-17

2707

Instruction

Manual

List

of

Tables

x

List

of

Tables

Preface

This manual is divided into the following sections.

Section 1, Introduction, includes a description of the

2707

External

Tracking Generator and lists the accessories and options available for it.

Section

2,

Getting Started, includes information about mechanically and

electrically attaching the External Tracking Generator to its controlling

spectrum analyzer. This section also describes a functional check that

you can perform to verify that the External Tracking Generator is

operating.

Section

3,

Operation, describes the operation of controls, functions of

front and rear panel connectors, and power requirements for the Exter-

nal Tracking Generator. Using the controlling spectrum analyzer menus

to operate the External Tracking Generator is also discussed. Finally, this

section provides the information required to operate the External Track-

ing Generator.

Section

4,

Specification, lists

in

table format the specifications for the

External Tracking Generator.

The

tables are grouped into three catego-

ries: nominal traits, warranted characteristics, and typical characteristics.

m

Section

5,

Performance Verification, provides tests that verify most of the

warranted characteristics listed in the Specification section. This section

lists the required test equipment.

m

Section

6,

Adjustment Procedure, and the following sections are in-

tended for use by qualified service personnel only. This section provides

adjustment procedures to return the External Tracking Generator to

conformance with its warranted characteristics.

Section

7,

Senlice Information, contains general maintenance inforrna-

tion, inspection

and

cleaning procedures, removal and installation

procedures, and troubleshooting information.

Section

8,

Theory of Operation, describes the circuit operation of the

External Tracking Generator, referencing block diagrams and the de-

tailed schematic diagrams in section

10.

m

Section

9,

Replaceable Electrical Parts, lists all the replaceable electrical

parts in the

2707

External Tracking Generator by circuit designation and

part number.

Section

1

0,

Schematic Diagrams and Circuit Board Illustrations, contains

schematic diagrams, circuit board illustrations, and component look-up

tables.

m

Section 11, Replaceable Mechanical Parts, lists all the replaceable

mechanical parts and their part numbers. Exploded views aid in identify-

ing the mechanical parts.

2707

Instruction

Manual

xi

Preface

xii

Preface

General

Safety

Summarv

This general safety information is for operating and servicing personnel.

Specific warnings and cautions may also be found throughout this manual

where they apply.

Symbols

and

Terms

These two terms appear in manuals:

statements identify conditions or practices that could result in

damage to the equipment or other property.

statements identify conditions or practices that could result in

personal injury or loss of life.

These three terms appear on equipment:

CAUTION

indicates a personal injury hazard not immediately accessible

as one reads the

marking,

or a hazard to property including the equip-

ment itself.

WARNlNG

indicates solely a personal injury hazard not immediately

accessible as you read the marking.

=

DANGER

indicates a personal injury hazard immediately accessible as

one reads the marking.

These symbols appear in manuals:

This

symbol indicates where applicable

cautionary or other information is to

be

found.

These symbols appear on equipment:

Static-Sensitive Devices

DANGER Protective

ATTENTION

High Voltage ground

(earth)

Refer

to

terminal manual

Refer to

manual

2707

Instructton

Manual

xiii

General Safety Summary

Specific

Precautions

Observe all of these precautions to ensure your personal safety and to

prevent damage to either the instrument or equipment connected to it.

Grounding the Instrument

This product is intended to operate from a power source that does not apply

more than

250

VRMs

between the supply conductors or between either

supply conductor and ground.

WARNING: This product is grounded through the grounding conductor of

the power cord. To avoid electric shock, plug the power cord into

a

properly

wired receptacle. A protective-ground connection through the grounding

conductor in the power cord is essential for safe operation

(IEC

Safety

Class

I).

Power Disconnect

The main power disconnect is by means of the power cord, or, if provided,

an AC power switch.

Use

the Proper Power Cord

Use only the power cord and connector specified for your product. Use only

a power cord that is in good condition. CSA Certification includes the equip-

/--.

.

ment and power cords appropriate for use in the North America power

network. All other power cords supplied are approved for the country of use.

)

Prevent Damage During Setup

The instrument can be damaged by incorrect

AC

supply voltages,

RF

inputs

that exceed the maximum

ratings,operation in very high temperatures or

without adequate ventilation, immersion in liquids, and physical abuse.

Do Not Operate Without Covers

To avoid personal injury or damage to the product, do not operate this

product with covers or panels removed.

Remove From Operation

If you have reason to believe that the instrument has suffered a component

failure, do not operate the instrument until the cause of the failure has been

determined and corrected.

Do Not Operate in WetIDamp Conditions

Using the instrument in wetldamp conditions or inclement weather may

result in electric shock or damage to the instrument.

xlv

General

Safety Summary

General

Safety

Summary

Do Not

Operate

in

Explosive Atmospheres

To avoid explosion, do not operate this product in an explosive atmosphere

unless it has been specifically certified for such operation.

Environmental

This product is intended for operation as:

IEC Installation Category II

IEC Pollution Degree

2

IEC Safety Class

I

2707

Instruction

Manual

xv

General

Safety Summary

.

xvi

General

Safely Summary

Servicing

Safety

Summary

This safety information is for servicing personnel. Specific warnings and

cautions may also be found throughout this manual where they apply.

Do Not

Service Alone

Do not perform internal service or adjustments of this product unless anoth-

er person capable of rendering first aid and resuscitation is present.

Use

Care

When Servicing

With

Power

On

To

avoid personal injury from high current, remove jewelry such as rings,

watches, and other metallic objects before servicing the instrument. Do not

touch exposed connections and components while power is on. Disconnect

power before removing protective panels, soldering, or replacing

components.

-..

Specific

Precautions

Observe a11 of these precautions to ensure your personal safety and to

prevent damage to either the External Tracking Generator or equipment

connected to it.

Use

the

Proper

Fuse

To avoid fire hazard, use only a fuse of correct type, voltage rating, and

current rating.

Remove Loose Objects

During disassembly or installation procedures, screws or other small objects

may fall to the bottom of the chassis. To avoid shorting out the power sup-

ply, do not connect power to the instrument until such objects have been

removed.

2707

Instruction Manual

xvii

Safety

Summary

Sewicing

Safety

Summary

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Tektronix 2707 User manual

Tektronix 2707 User manual

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