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.
All rights reserved. Tektronix products are covered
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 Tracking 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 intended 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 identifying 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
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