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T~ktronoc
COMMITTED TO EXCELLENCE
INSTRUCTION MANUAL
Tektronix, Inc.
P.O . Box 500
Beaverton, Oregon 97077 Serial Number
070-3526- 0 0 First Printing Aug 1980
TR 503
TABLE OF CONTENTS
LIST OF ILLUSTRATIONS . . . . . . . . . . . . . . . . . iii Section 3 THEORY OF OPERATION (cont)
OPERATORS SAFETY SUMMARY . . . . . . . . . . . iv Bias and Leveling Loop Circuitry . . 3-3
SERVICING SAFETY SUMMARY . . . . . . . . . . . . v Phase Lock Loop . . . . . . . . . . . . . 3-4
Power Supply Regulators . . . . . . . 3-5
Section 1 GENERAL INFORMATION AND
SPECIFICATIONS
Section 4 CALIBRATION
Introduction . . . . . . . . . . . . . . . . . 1-1
Introduction . . . . . . . . . . . . . . . . . . . 4-1
Overview . . . . . . . . . . : . . . . . . . . 1-1
Standards . . . . . . . . . . . . . . . . . . 1-2 History Information . . . . . . . . . . . . . 4-1
Equipment Required . . . . . . . . . . . . . 4-1
Electrical Characteristics . . . . . . . . . . 1-2
PERFORMANCE CHECK . . . . . . . . . 4-2
Environmental Characteristics . . . . . . 1-3
Introduction . . . . . . . . . . . . . . . . . . . 4-2
Physical Characteristics . . . . . . . . . . 1-3
Preliminary Inspection . . . . . . . . . . . 4-2
Accessories . . . . . . . . . . . . . . . . . 1-3
Performance Verification . . . . . . . . . . 4-2
Section 2 OPERATING INSTRUCTIONS Check Frequency Range . . . . . . . . 4-2
Check Output Level . . . . . . . . . . . 4-2
Introduction . . . . . . . . . . . . . . . . . . . 2-1
Check Flatness . . . . . . . . . . . . . . 4-2
About the Tracking Generator . . . . . . 2-1
Check Auxiliary Output Level . . . . 4-3
Installation . . . . . . . . . . . . . . . . . . . . 2-1
Check for Spurious Signals . . . . . . 4-3
Repackaging . . . . . . . . . . . . . . . . . . 2-1
ADJUSTMENT PROCEDURE . . . . . . 4-4
Functions of the Controls and
2-1 Introduction . . . . . . . . . . . . . . . . . . . 4-4
Connectors . . . . . . . . . . . . . . . . . . .
Complete or Partial Calibration . . . . . 4-4
Operators Checkout Procedure . . . . . 2-2
Test Points . . . . . . . . . . . . . . . . . . . 4-4
Check Flatness . . . . . . . . . . . . . . 2-3
Preliminary Preparation . . . . . . . . . . 4-4
Check Output Level . . . . . . . . . . . 2-4
Tracking Adjustment . . . . . . . . . . 2-4 55 MHz Oscillator Mode Adjust . . . 4-4
Adjust the Normalizing Attenuator . 4-5
Measuring Frequency . . . . . . . . . . 2-4
Output Level Calibration . . . . . . . . 4-6
Section 5 MAINTENANCE
WARNING
Introduction . . . . . . . . . . . . . . . . . 5-1
THE FOLLOWING SERVICING INSTRUCTIONS Static-Sensitive Components . . . . . 5-1
ARE FOR USE BY QUALI FI ED PERSONNEL ONLY. Preventive Maintenance . . . . . . . . . . 5-1
TO AVOID PERSONAL INJURY, DO NOT PER- Cleaning . . . . . . . . . . . . . . . . . . . 5-2
FORMANYSERVICING OTHER THAN THAT CON- 5-2
Exterior . . . . . . . . . . . . . . . . . .
TAINED IN OPERATING INSTRUCTIONS UNLESS
YOU ARE QUALIFIED TO DO SO. Interior . . . . . . . . . . . . . . . . . . 5-2
Lubrication . . . . . . . . . . . . . . . . . 5-2
Visual Inspection . . . . . . . . . . . . . 5-2
Section 3 THEORY OF OPERATION
Transistor and Integrated Circuit
General Description . . . . . . . . . . . . . 3-1 Checks . . . . . . . . . . . . . . . . . . . . 5-2
Block Diagram Description . . . . . . . . 3-3 Performance Checks and
Detailed Circuit Description . . . . . . . 3-3 Recalibration . . . . . . . . . . . . . . . . 5-2
RF and Microwave Circuits . . . . . . 3-3 Troubleshooting . . . . . . . . . . . . . . . . 5-2
TR 503
TABLE OF CONTENTS (cont)
Page Page
Section 5 MAINTENANCE (cont) Section 5 MAINTENANCE (cont)
Troubleshooting Aids . . . . . . . . . . 5-2 Replacing Assemblies . . . . . . . . . . . . 5-7
Diagrams . . . . . . . . . . . . . . . . . 5-2 ~ Removing or Replacing Semi-rigid
Circuit Board Illustrations . . . . . 5-3 Coaxial Cables . . . . . . . . . . . . . . . 5-7
Wiring Color Code . . . . . . . . . . 5-3 Replacement of Microwave
Assemblies . . . . . . . . . . . . . . . . . 5-7
Multiple Terminal (Harmonica)
Connectors . . . . . . . . . . . . . . . 5-3 Separating the TR 503 . . . . . . . 5-7
Resistor Values . . . . . . . . . . . . 5-3 Removing the Assembly . . . . . . 5-7
Capacitor Marking . . . . . . . . . . 5-3 Replacing the 2.182 GHz Four Cavity
Filter/Mixer Assembly . . . . . . . . . . 5-8
Diode Color Code . . . . . . . . . . 5-4
Transistor and Integrated Circuit Remove and Replace the Filter
Assembly . . . . . . . . . . . . . . . . . 5-8
Pin Configuration . . . . . . . . . . . 5-4
Filter Alignment Procedure . . . . 5-8
Diode Checks . . . . . . . . . . . . . 5-4
General Troubleshooting Technique 5-5
Section 6 REPLACEABLE ELECTRICAL PARTS
Corrective Maintenance . . . . . . . . . . 5-6
Obtaining Replacement Parts . . . . 5-6
Section 7 DIAGRAMS AND CIRCUIT BOARD
Parts Repair and Replacement
ILLUSTRATIONS
Program . . . . . . . . . . . . . . . . . . . 5-6
Soldering Technique . . . . . . . . . . 5-6
Replacing the Square Pin for the Section 8 REPLACEABLE MECHANICAL PARTS
Multi-pin Connectors . . . . . . . . . . 5-6
Selected Components . . . . . . . . . . 5-6 CHANGE INFORMATION
LIST OF I LLUSTRATI ONS
r~ g.
No . Page
2-1 `Plug-in module installation . . . . . . . . . . 2-2
2-2 TR 503/492 System with frequency counter 2-3
3-1 TR 503/492 System diagram . . . . . . . . . 3-2
4-1 Setup for performance check . . . . . . . . 4-3
4-2 Setup for adjustment procedure . . . . . . . 4-5
4-3 Location of receptacle K, W520, and C524 4-5
4-4 Location ofadjustment R215 and
adjustments R225, R220, and R222. . . . ~ 4-6
5-1 Multipin (harmonica) connector
configuration . . . . . . . . . . . . . . . . . . . . 5-3
5-2 Color code for tantalum capacitors . . . . 5-3
5-3 Diode polarity markings . . . . . . . . . . . . 5-4
5-4 Pin configuration for semiconductor
components . . . . . . . . . . . . . . . . . . . . . 5-5
5-5 Procedure for separating two sections of
the TR 503 . . . . . . . . . . . . . . . . . . . . . . 5-7
5-6 Typical position for the mixer in the
2.182 GHz filter assembly . . . . . . . . . . . 5-8
5-7 TR 503/492 System diagram showing
phase-lock assembly . . . . . . . . . . . . . . 5-9
5-8 Positioning the TR 503 to adjust the
2.182 GHz filter/mixer assembly . . . . . . . 5-10
5-9 Location of P446 on the mother board . . 5-11
5-10 Typical responses of the filter/mixer
assemblies . . . . . . . . . . . . . . . . . . . . . . 5-11
TR 503
'J
OPERATORS SAFETY SUMMARY
'J
._
The general safety information in this part of the summary supply conductors or between either supply conductor
is for both operating and servicing personnel. Specific and ground . A protective ground connection by way ofthe
grounding conductor in the power cord is essential for
warnings and cautions will be found throughout the
manual where they apply, but may not appear in this safe operation.
summary .
Grounding the Product
Terms In This Manual This mainframe is grounded through the grounding
CAUTION statements identify conditions orpracticesthat conductor of the power cord . To avoid electrical shock,
could result in damagetothe equipment or other property . plug the power cord into a properly wired receptacle
before connecting to the product input or output ter
WARNING statements identify conditions or practices urinals. A protective ground connection by way of the
that could result in personal injury or loss of life . grounding conductor in the power cord is essential for
safe operation.
Terms As Marked on Equipment
CAUTION indicates a personal injury hazard not im- panger Arising From Loss of Ground
mediately accessible as one reads the marking, or a
hazard to property including the equipment itself . Upon loss of the protective-ground connection, all
accessible conductive parts (including knobs and con
DANGER indicates a personal injury hazard immediately trots that may appear to be insulating) can render an
accessible as one reads the marking. electric shock.
Symbols In This Manual Do Not Operate in Explosive Atmospheres
To avoid explosion, do not operate this product in an
This symbol indicates where applicable
cautionary or other information is to be explosive atmosphere unless it has been specifically
I
certified for such operation.
found.
Do Not Remove Covers or Panels
Symbols As Marked on Equipment
To avoid personal injury, do not remove the product
DANGER - High voltage .
covers or panels . Do not operate the product without the
covers and panels properly installed.
Protective ground (earth) terminal .
ATTENTION - refer to manual .
Do Not Operate Without Covers (for TM 500 plug-
ins only)
Power Source To avoid personal injury, do not operate this product
The mainframeisintendedtooperatefrom apowersource without covers or panels installed. Do not apply power to
that does not apply more than 250 volts rms between the the plug-in via a plug-in extender .
~r -
iv
TR 503
SERVICING SAFETY SUMMARY
FOR QUALI FI ED SERVICE PERSONNEL ONL Y
Refer also to the preceding Operators Safely Summary.
Do Not Service Alone Disconnect power before removing protective panels,
soldering, or replacing components .
Do not perform internal service or adjustment of this
product unless another person capable of rendering first
aid and resuscitation is present . Power Source
The mai nframe is intended to operate from a power source
that does not apply more than 250 volts rms between the
Use Care When Servicing With Power On
supply conductors or between either supply conductor
Dangerous voltages exist at several poi nts in this product . and ground. A protective ground connection by way of the
To avoid personal injury, do not touch exposed connec- grounding conductor in the power cord is essential for
tions and components while power is on. safe operation .
3526-1
TR 503 Tracking Generator
Section 1-TR 503
GENERAL INFORMATION AND
SPECI FI CATI ONS
Introduction Section 2-Operating Instructions ; introducesthe user
to the TR 503/492 system and demonstrates a series of
The TR 503 may be used to measure the frequency measurement procedures .
response of a device or component over a 100 kHz to
1 .8 GHz range. It is used in conjunction with a TM 500
mainframe and a 492 Spectrum Analyzer . The tracking Service
generator/spectrum analyzer method of response
measurement has intrinsically greater rejection of device Section 3-Theory of Operation; describes all major
or environmental noisethanthealternatesweptsine-wave circuits of the TR 503.
C method .
The greater noise rejection is gained by having the 492
Section 4-Calibration, Part 1 : Performance Check;
this subsection is used to verify all of the Performance
Spectrum Analyzer track the TR 503 output . Noise rejec- Requirements in the Specification, and to determine the
tion is improved as the Resolution Bandwidth of the 492is need for recalibration (adjustment) of the TR 503 .
decreased ; this is due to the 492 being immune to noise
outside of the VR (Variable Resolution IF) bandwidth.
Section 4-Calibration, Part 2: Adjustment Procedure;
_ this subsection is used to return the TR 503 to confor-
The TR 503 uses the 1st and 2nd LO (local oscillator) mance with the Performance Requirements . The
: outputs of the 492 to generate a frequency that tracks the procedure is arranged in functional blocks to facilitate
input of the 492. The TRACKING ADJUST control of the referencing from the Performance Check and the
TR 503 allows fine adjustment of this frequency. Maintenance Instructions .
Points on the 492 display may have their frequencies Section 5-Maintenance Instructions; describes
measured by adding a frequency counter, such as the routine and corrective maintenance procedures with
DC 508, to the TR 503/492 system . Measurements may be detailed instructions for replacing assemblies, sub-
made directly from an external rf spectrum or obtained assemblies, and individual components . An exploded
4
from the response curve of a device under test . drawing is part of Section 8.
Overview Section 6-Replaceable Electrical Parts; provides in-
formation necessary to order replaceable parts and
The Operators part of the manual is intended to helpthe assemblies related to the electrical functions of the
user obtain maximum performance from the TR 503/492 instrument .
system . This part covers General Information and the
Operating Instructions.
Section 7-Diagrams ; provides functional block
n diagram and circuit schematics . Pictorial layout drawings
The Service part of the manual covers the Theory of which show subassembly and component locations are
Operation, the Calibration section, and other service adjacent to the diagram (usually on the back of the
information, including the block and schematic diagrams preceding diagram) . Voltage and signal levels are includ-
of the TR 503. ed to aid in troubleshooting .
The eight sections of the manual are: Section 8-Replaceable Mechanical Parts; provides
information necessary in order to replace mechanical
Operators parts. This list is cross-referenced to the replaceable
Section 1-General Information and Specifications ; electrical parts list where appropriate. The Exploded
c contains the instrument description, a list of accessories, Drawing shows the assembly sequence and identifies the
and a listing of the TR 503 Characteristics and Perfor- assemblies . The Accessories page lists the standard and
mance Requirements . optional accessories.
G
General Information and Specifications-TR 503
Changes and Corrections ; provides updating informa- Standards
lion for the manual in the form of inserts. These inserts are The abbreviations and graphic symbols used inthetext
incorporated into the manual text and diagrams when the and diagrams of this manual are based on ANSI Y1 .1-1972,
manual is updated. ANSI Y32.2-1970, and ANSI Y32 .14-1973 (American
National Standards Institute, 345 East 47 Street, New York,
N. Y. 10017) .
SPECIFICATIONS
The following specificationsapplytotheTR 503 Track- Items listed in the Performance Requirements column
ing Generator and the TR 503/492 Spectrum Analyzer are verified by completing the Performance Check in
system . Allow at least 30 minutes warmup unless noted Section 4 of this manual . Items listed in the Supplemental
otherwise. Information column may not be verified in this manual ;
they are either explanatory notes or performance
characteristics for which no limits are specified.
Table 1-1
ELECTRICAL CHARACTERISTICS
Characteristic Performance Requirement Supplemental Iof ormation
Frequency Range The TR 503 tracks the 492 tuned
input frequency from 100 kHz
to 1 .8 GHz.
Output Level
Maximum Output OdBm