Tektronix TR 502 User manual

INSTRUCTION

Part No .
070-1735-00
MANUAL

Product
Group 26
TR 502
TRACKING
GENERATOR
~ron~~
coMnnirreo ro ExcFi_~Ervce

TE K MANUAL T
~
ON
First
Printing NOV
1975
Revised
AUG
1984
TR 502
Part No ._ .070-1735-00
Product Group 26
TRACKING
GENERATOR
Please Check for
CHANGE lNFORMATlON at the Rear
of This Manual
'Tronix®

Copyright © 1975
Tektronix, Inc . All
rights reserved .
Contents of this
publication may not be
reproduced in
any form
without the written permission
of Tektronix, I nc .
Products of Tektronix,
Inc . and its
subsidiaries are
covered by U .S .
and foreign patents
and/or pending
patents .
TEKTRONIX,
TEK,
SCOPE-MOBILE, and

are
registered trademarks of
Tektronix, Inc .
TELEQUIP-
MENT is a
registered trademark
of Tektronix U .K
.
Limited .
Printed in U .S .A
. Specification and
price change
privileges are reserved
.

SECTION 5 CIRCUIT DESCRIPTION
TABLE
OF
CONTENTS
SECTION 8 ELECTRICAL PARTS LIST
Block Diagram Description

5-~

SECTION 9
DIAGRAMSandCIRCUIT
Detailed Circuit Description

5-1
RF and Microwave Circuits

5-1

BOARD ILLUSTRATIONS
Bias Circuitry and Leveling Loop

5-2
Phase Lock Loop

5-3

SECTION
10 MECHANICAL PARTS LIST
Operational Logic

5-4
Power Supply Regulators

5-4

CHANGE INFORMATION
TR
502
SECTION
1 GENERAL INFORMATION

Page

SECTION 6 MAINTENANCE

Page
AND SPECIFICATIONS

INSTRUCTIONS
Introduction

1-1

Preventive Maintenance

6-1
Description

1-1

Cleaning

6-1
ELECTRICALCHARACTERISTICS 1-2

Lubrication

6-1
ENVIRONMENTAL

Visual Inspection

6-1
CHARACTERISTICS

1-2

Transistor and IC Checks

6-1
ACCESSORIES

1-2

Performance Checks and
INSTALLATION

1-2

Recalibration Schedule

6-1
REPACKAGINGFOR SHIPMENT

1-3

Troubleshooting

6-2
SECTION
2 OPERATING INSTRUCTIONS

Troubleshooting Aids

6-2
Diagrams

6-2
Introduction

2-1

Circuit Board
Illustrations

6-2
About the Tracking Generator

2-1

Wiring Color Code

6-2
Function of the Front Panel

Connectors

6-2
Controls and Connectors

2-1

Capacitor
Marking

6-2
Operational Check

2-1

Diode Code

6-2
SECTION 3 PERFORMANCE
CHECK

Transistor and Integrated
Circuit (IC) Electrode
Introduction

3-1

Configuration

6-2
Preliminary Preparation

3-1

Finding Faulty
Semiconductors

6-2
Check Frequency Range

3-1

Diode Checks

6-3
Check
RF OUT Amplitude Range

3-1

IC Checks

6-4
Check Flatness

3-1

General Troubleshooting
Performance Checks Which

Techniques

6-4
Require Test Equipment

3-1

Corrective
Maintenance

6-5
Equipment Required

3-1

Obtaining Replacement Parts

6-5
Check
Amplitude Range

3-1

Parts Repair and Exchange
Check Output Flatness

3-1

Program

6-5
Check Auxiliary Output
Power

3-2

Soldering Technique

6-5
Check
Residual FM

3-2

Transistor and IC Replacement

6-5
Check for Spurious Signals

3-2

Replacing
Square Pins for the
Multipin Connectors

6-6
SECTION 4
CALIBRATION PROCEDURE

Interconnecting Cable and Pin
Complete or Partial
Calibration

4-1

Replacement

6-6
Adjustment and Test Point

Replacing Assemblies

6-6
Locations

4-1

Replacing
Microwave
History
Information

4-~

Assemblies

6-6
Equipment Required

q-1

Replacing the 2 .2 GHz Four
Cavity
Filter
or
Mixer
Preliminary Preparation

4-1

Assemblies

6-7
52 .5 MHz Oscillator Mode Adjust
4-2
Adjusting the
Normalizing
Attenuator

4-3

SECTION 7 OPTIONS and
MODIFICATIONS
Output Level Calibration

4-3
Sweep Trigger Level Adjustment
4-3

Fig .
1-1
. TR 502 Tracking Generator .

Introduction

Section
7-Options and Modifications : Provides data
The
abbreviations, graphic symbols, and logic sym-

on production options
available .
bology used in the text
and
diagrams
of this manual are in
accord and
based on ANSI Y1 .1-1972, ANSI Y32 .2-1970,
and ANSI Y32 .14-1973 (American
National Standard

Section 8-Electrical Parts List :
Provides information
Institute, 345 East 47 Street ; New York, N .Y . 10017) .

necessary to order replaceable parts and
assemblies
related to the electrical functions of the instrument .
Change information
has been integrated into the
manual by goldenrod insert pages
at
the
back of the
manual and page revision . Original pages are identified
by
the
symbol @ and revised pages are identified
by
a
revision date in the lower inside corner of the page . If the
serial number
of your
instrument
is lower than the one on
the title page, the manual contains revisions
that may not
apply to your instrument . History
or backlog information
all previously applicable to produced products with the
updated data is integrated when the page or diagram is
revised . The fol lowing describes
the sections and informa-
tion provided in this manual .
Section 1-General Information and Specifications :
Contains instrument description, electrical specifications,
environmental
characteristics, accessories, installation,
and repackaging for shipment instructions
.
Section 2-Operating Instructions : Information relative
to operating and checking the instrument operation .
Section 3-Performance Check : Procedure to check
the operational
performance and electrical specifications
of the instrument . Two-part section
provides an
incoming
inspection type check and a detailed electrical perfor-
mance
verification .
Section 4-Calibration Procedure : Describes test

description
equipment
setup and adjustment procedures required to

The TR 502
Tracking
Generator
operates with the 7L13
calibrate the
instrument .

or 7L12 Spectrum
Analyzer to provide a calibrated rt signal
for
swept
frequency applications from 100 kHz to 1 .8 GHz .
Section 5-Circuit Description : Provides basic and

The output frequency of the TR 502 can be adjusted to
general circuit analysis that
may be useful when servicing

track the spectrum analyzer frequency within 10
Hz . The
or operating the instrument .

TR 502, a two-wide unit compatible with the TM 500 Modu-
lar Series instruments, is normally used with the TM 503
(Option 07) Power Module . This permits the optional use of
Section

6-Maintenance

Instructions :

Describes

a digital counter such as the DC 508A with Option 07 . A
routine
and corrective maintenance procedures with

bright dot, on the spectrum display, identifies the frequency
detailed

instructions

for

replacing

assemblies,

sub-

location on the sweep that is indicated by thecounter
. High-
assemblies, and individual components
.
An
exploded

er range counters to 1 .8 GHz can be used by connecting
drawing is part of Section 10 .

their input to the TR 502 AUX RF OUT connector
.
REV DEC 1981
GENERAL
INFORMATION AND
SPECIFICATIONS
Section 1-TR 502
Section 9-Diagrams :
Provides functional block
diagram and detailed circuit schematics
. Located adja-
cent to the diagram (usually on the back of the preceding
diagram)
are pictorial layout drawings which show sub-
assembly and component
locations . Voltage and signal
level information, if applicable,
is included to aid in
troubleshooting .
Section 10-Mechanical Parts List, Exploded Drawings
and
Accessories : Provides information necessary to order
replaceable
mechanical parts . The Parts List is cross-
referenced to the Electrical Parts List when
appropriate .
Exploded drawing shows sequence of assembly and
identifies assemblies .
Changes
and Corrections : Provides updating informa-
tion for the
manual in the form of inserts . These inserts are
incorporated into the
manual text and diagrams when the
manual is updated .

General Information
and Specifications-TR
502
The following
characteristics and features apply to
the
TR 502 and TR 502/7L13
Spectrum Analyzer
system .
They are applicable
over the environmental
specification
limits for the TM 500-
and 7000-Series
mainframes .
Frequency Range :

The TR 502 tracks
the 7L13 tuned
input
frequency from 100 kHz to
1 .8 GHz .
Output
Level :
Two
coaxial cables, 50
f2
Maximum Out-

0 dBm ±0 .5
dB .
put Position

28
.5
inches
Logic
Interface Cable
(0 dBm) :

Adapter,
"N male to
BNC female"
Range :

0 to -59
dBm in 10 dB and
1 dB

Adapter, SMA Male
to
steps .

BNC Female
Retainer
Plug-in
Relative Level

±0
.2 dB/1 dB step
to a maximum
Manual,
Instruction
Accuracy :

of ±2 .0 dB .
A front panel control
provides an
additional 2 dB of

Optional
Accessories
attenuation
.

10
dB attenuator
Output
Impedance :

50
S2 nominal, VSWR is
2 :1 or less
to 1 .8 GHz .
Flatness :
ELECTRICAL
CHARACTERISTICS
TR 502
:

Within ±0 .65 dB, from
100 kHz to
1 .8 GHz .
TR 502/7L13

Within ±1 .65 dB, from 100 kHz to
System
:

1 .3 GHz and within ±2dB
to 1 .8
GHz .
Dynamic
Range :
TR
502/7L13

110 dB or
more .
System :
Residual FM (peak
to peak) :
Installation
TR 502 :

1 Hz or
less .
This instrument may be
shipped installed in
the
TR 502/7L13 :

10 Hz or
less .

TM
500-Series Power Module
and ready for
use as a
bench
instrument, or it may be
shipped as an
individual
Auxiliary Output :

0 .1
V rms minimum, into 50
i2load .

unit .
The instrument is held
in the mainframe by
means of
a
mounting screw and
shoulder washer
through an
Spurious Output
:

existing hole in a
bottom cross-member
. The retainer
screw threads
into a bracket that is
mounted on the back
Harmonic

20 dB or more
below the carrier .

of the TR 502
. (See list of accessories
on ACCESSORIES
Content :

tab page
at the back of this
manual .) Removethis
screw to
Non-Harmonic

40 dB
or more below the
carrier .

free the TR 502 from
the mainframe .
If shipped as an
Content :

individual unit, install
the bracket assembly
by removing
the two center
screws at the rear of the
TR 502 and use
ENVIRONMENTAL
CHARACTERISTICS

them to mount the bracket
; install
the TR 502 into the
TM 500 Power
Module as illustrated
in Fig . 1-2 .
After
installation,
connect the TM 500
to a suitable
power
This instrument
will meet the
electrical characteristics

source
and proceed as directed
in the Operating
Instruc-
over the environmental limits
of the TM 500-Series
Test

tions
section of this
manual .
and
Measurement System
Power Module .
Complete
details on test
procedure, including
failure criteria, etc .,
can be obtained
from Tektronix,
Inc . Contact your
local
Tektronix
Field Office or
representative .
Operating and Storage
Requirements :
Operating Temperature
Range :

0°C to +55°C .
Storage Temperature
Range :

-54°C to
+75°C .
ACCESSORIES
StandardAccessories
Refer to the ReplaceableMechanical
Parts
Section for part
numbers of
standard and optional
accessories .
Initial Inspection
INSTALLATION
This instrument
was inspected both
mechanically and
electrically
before shipment . It should be
free of mars or
scratches
and electrically meet
or exceed
all
specifications . To confirm this,
inspect the instrument
for
physical damage incurred
in transit and test
the electrical
performance by following
the Operating
Instructions in
Section 2 and
Performance Check Procedure
in Section 3 .
If there is damage
or deficiency,
contact your local
Tektronix
Field Office or representative
.
REV . A, MAY, 1978

If
the Tektronix instrument is to be shipped to a
Tektronix Service Center for service or replacement,
attach a tag showing ; owner (with address) and the name
of an individual at your firm that can be contacted, plus
complete instrument
serial number and a description of
the
service required
.
General Information and Specifications-TR 502
Fig . 1-2 . Plug-in Module Installation/Removal .
1735-2
REPACKAGING
FOR SHIPMENT

2 . Wrap the instrument in heavy paper orpolyethylene
sheeting to protect the finish of the instrument . Protect the
front panel with urethane foam or cardboard strips .
3 . Cushion the instrument on all sides by tightly
packing dunnage or urethane foam between the carton
and the instrument, allowing three incheson all sides .
4 . Seal the
carton
with shippingtape
or an industrial
stapler .
Save and re-use the shipping container your instru-

TABLE 1-1
ment was shipped in . If
the original packaging is not
available or unfit for use,
repackage as follows :

GrossWeight (Ib)

Carton Test Strength (Ib)
10-30 275
30-120

375
1 . Obtain
a shipping container made of heavy cor-

120-140

500
rugated cardboard
or wood with inside dimensions of no

140-160

600
less than six inches more than the instrument dimensions
;
this will allow room for cushioning . Refer to Table 1-1 for

If you have any questions, contact your local Tektronix
carton
test strength requirements .

Field Office or representative .

Introduction

VAR dB
: This control provides
continuous output level
This section describes the function of the
front panel

adjustment over a range of
2
dB
; itaffects both the RF OUT
controls and connectors, installation of
the TR
502
into

and AUX RF OUT
levels .
the TM
500-Series mainframe,
interface connections to
the

spectrum

analyzer

and

frequency

counter,

ad-

DOT INTENSITY : This control sets
the brightness of the
justmentsrequiredtocalibratetheTR 502 to the spectrum

displayed frequency
indicating dot when the TR 502 is
analyzer, and how to use the tracking generator .

used
with a DC 502 Option 7, or equivalent frequency
counter, and the TR 502/7L13 Spectrum Analyzer is
operating in the sweep stop mode .
About the Tracking Generator
The TR 502 Tracking Generator is a two wide plug-in
unit for the TM 500-Series (Option 7) Power Modules . It
operates with the 7L13 or 7L12 Spectrum
Analyzer to
provide a constant,
level-calibrated rf signal source, that
precisely tracks the spectrum analyzer input frequency
from 100 kHz to 1 .8 GHz . Signal output level is calibrated
and adjustable from 0 dBm to -59 dBm in 1 dB steps . The
Spectrum Analyzer/Tracking Generator system can be
used to display frequency response of
carious devices
such as
filters, amplifiers, etc . that are connected between
the tracking generator RF OUTput and the spectrum
analyzer rf input connector .
When the TR 502 is installed in a modified three-wide
or

AUX RF OUT : A source of the output signal for auxiliary
larger, power module, a frequency
counter such as the

test equipment such as a frequency counter . This
DC 502 can be connected to the
AUX
OUT
and used to

output connector must be terminated in a 50
S2
load to
accurately
measurethefrequencyforanyfixedpositionof

maintain flatness .
span
. When the analyzer is in the non-sweep mode, the
TR 502 output is a cw signal and the counter reads
continuously . If a DC 502 Option 7, or
similar counter is

INPUT CONNECTORS :
used, the
TRACKING GEN LOGIC is interfaced with the
7L13 Spectrum
Analyzer
so
operational logic from the

1st LO IN and 2nd LO IN : These interface to
the
TR
502 controls
the sweep function of the spectrum

spectrum analyzer 1 st LO and2nd LO
Output connec
analyzer and the frequency counting of the counter . A dot

tors .
i s displayed at sweep center to indicate where
and when
the frequency count is taken
.

TRACK GEN LOGIC :
Interfaces operational logic
between the tracking generator and the spectrum
The TR 502 is installed in the TM 500-Series mainframe

analyzer to operate the system with a
compatible
by aligning the upper and lowerguide rails
with the plug-in

frequency counter .
compartment tracks and pushing the
TR 502 into the
compartment until the front
panel
is
flush with the
mainframe front panel
.
To
remove, pull the release latch to
disengage the locking mechanism and
pull t(~e unit out .

Operational Check and Calibration
See Fig .
1-2 .

The TR 502 plugs into and receives its power
from a
TM 500-Series mainframe . It operates
with the 7L13 or
7L12 Spectrum
Analyzer . The 1st and 2nd LO signal from
Function

of

the

Front

Panel

Controls

and

the spectrum analyzer are applied, via coaxial cables, to
Connectors

the 1st and 2nd LO INput connectors for the TR 502
. If the
The following is a description of the controls and

TR
502/7L13 system is used with a DC 502
Option 7
connectors on the TR 502 :

Digital Counter, a third cable
interfaces between the
TR 502 and 7L13 Spectrum
Analyzer to supply the
OUTPUT LEVEL : Selects 0 dB to
59 dB of attenuation in 1

necessary logic data for the various counter and spectrum
dB steps of the
calibrated output signal to the RF OUT
; it

analyzer operating modes . This interface cable is used
has no
effect on the output level of the AUX RF OUT
.

when a counter is part of the system
.
REV . A, MAY, 1978
OPERATING
INSTRUCTIONS
Section 2-TR 502
TRACK ADJUST : Adjusts the frequency offset between
the TR 502 Tracking Generator output signal and
the
tuned input frequency of the spectrum analyzer
.
OUTPUT
CONNECTORS :
RF OUT : A 0 dBm to -61 dB, 50 S2, signal source with a
frequency, that tracks the spectrum analyzer
. Output
level depends on the setting of
OUTPUT LEVEL and
VAR dB controls .
2-7

Operating
Instructions-TR 502
1 .

Preliminary

c .
Set the spectrum
analyzerSpan/Divto
Max, Resolu-
a .

Insert the
TR 502 in a TM 500
power unit
mainframe

Lion to
3 MHz, Display
Mode to 10
dB/Div, Reference
(TM 500 Option
7) and the spectrum
analyzer (7L13)
into a

Level to 0 dBm, and
switch on the
power to all units .
7000-Series
mainframe .
b .

Using the
coaxial cables, supplied
with the standard
accessories,
connect the 1st
and 2nd LO
Output ports of
the
spectrum analyzer to the
1
st
and 2nd LO
Input ports of

2 .

Check
Output Level
the
TR 502, then connect
the RF OUT to
the RF Input of
the spectrum analyzer
. If a frequency
counter is
used,

a .
Change the spectrum
analyzer Reference
Level to
connect the AUX
RFOUTput of
the TR 502 to the
RF Input

0 dBm
. Set the TR 502
OUTPUT LEVEL
and VAR dB
of the counter
. Fig . 2-1 illustrates
system hookup .

controls for an output of
0 dBm (fully
clockwise) .
2-2
FREQUENCY
COUNTER
AUX
RF

RF

\" /

" .
OUT
OUT

TRACK GEN

RF

"

TRACK
INPUT ~1 LOGIC

IN

GEN
N-TO-BNC
ADAPTER
TR502
3mm, SMA-TO-BNC
ADAPTER
2nd LO
7st LO
d . Set the
OUTPUT
LEVEL of the TR 502 to
-10 dBm
and
check for a level
(±3 dB) across the
spectrum
analyzer
display (100 kHz
to 1 .8 GHz) .
Fig . 2-1
. TR 502/7L13
Spectrum Analyzer
System with a
FrequencyCounter
.
aooo
0000
0 0
0
1735-3A
REV . A, MAY,
1978