Tektronix SG 505 User manual

Tektronix , Inc.
P.O.
Box 500
Beaverton ,
Oregon
070-4359-00
Product
Group 75
97077
Tektronix
COMMITTED TO
EXCELLENCE
PLEASE CHECK FOR CHANGE INFORMATION
AT THE REAR OF THIS MANUAL .
SG
505
OPTION
02
OSCILLATOR
INSTRUCTION
MANUAL
Serial Number
First
Printing NOV
1982

Copyright
1979 ,
1982
Tektronix ,
Inc.
All rights
reserved .
Contents of this publication may not be reproduced in any
form
without the
written permission
of
Tektronix , Inc.
Products of
Tektronix ,
Inc.
and its
subsidiaries
are covered
by
U.S.
and foreign
patents
and
/ or
pending
patents .
are regis
TEKTRONIX ,
TEK
,
SCOPE -
MOBILE
,
and
tered
trademarks of
Tektronix
, Inc.
TELEQUIPMENT
is a
registered
trademark of
Tektronix
U.K.
Limited .
Printed in
U.S.A. Specification
and price
change privileges
are
reserved .
O

O
PREFACE
The information in this instruction manual describes only the
Option 02 version of the SG 505 Oscillator . All references in
this manual to the SG 505 Oscillator refer only to the Option
02
version , unless
otherwise
indicated .
SG
505
Opt .
02
A
separate
instruction
manual is
available
for the
standard
SG
505
Oscillator , with Option
01
information .
Contact
your
local
Tektronix field office
or representative
for order
ing
information .
i

O
Preface
List of Illustrations
List of Tables
Operators Safety Summary
Servicing Safety Summary
Section 1 SPECIFICATION
TABLE OF CONTENTS
Introduction ....
Standard
Accessories ...
Performance Conditions
Electrical Characteristics ..
Front Panel ....
Rear Interface
Miscellaneous
Environmental ..
Physical
Characteristics
Section 2 OPERATING INSTRUCTIONS
Preparation
for Use
..
Repackaging
Information
Controls and Connectors
Operators
Familiarization .
General Operating Information
Frequency
Selection
.
Output Level Selection ..
Intermodulation
Test
Signal
Output
Connections
...
Rear
Interface
Signals
WARNING
Page
i
iv
V
vi
Section 3 THEORY OF OPERATION
Introduction ....
Phase Shift Oscillator
Amplitude
Detector
Peak
Detector ...
Amplitude
Control
vii
1-1
1-1
1-1
1-2
1-2
1-3
1-4
1-5
1-5
THE
FOLLOWING SERVICING INSTRUC
TIONS ARE FOR USE BY QUALIFIED PER
SONNEL ONLY . TO AVOID PERSONAL INJU
RY , DO NOT PERFORM ANY SERVICING
OTHER THAN THAT CONTAINED IN OPER
ATING
INSTRUCTIONS UNLESS
YOU ARE
QUALIFIED TO DO SO .
2-1
2-1
2-2
2-4
2-4
2-4
2-4
2-4
2-4
2-7
3-1
3-1
3-1
3-1
3-1
Section
3
THEORY OF
OPERATION
(
cont
)
Output Buffer Amplifier ...
Sync Driver and Sync Amplifier
Power
Supply
IMD Oscillator
Inverting Buffer and Power Amplifiers
Output Attenuators and Rear Interface
Buffers ....
Section 4 CALIBRATION PROCEDURE
Introduction
..
Test Equipment Requirements
Performance Check ....
Introduction ...
Test
Equipment
Required .
Preparation
Procedure .
Adjustments
Introduction
...
Test Equipment Required .
Preparation
Procedure .
SG
505
Opt .
02
Section 5 MAINTENANCE
Introduction
..
Obtaining Replacement Parts
Cleaning
Instructions
.....
Circuit Board Removal and Installation
Low
Frequency
Selection .
Troubleshooting
Aids
Troubleshooting Equipment
Static
-
Sensitive
Components
Section
6
OPTIONS
Accessories
Section 7 REPLACEABLE ELECTRICAL PARTS
Section 8 DIAGRAMS AND CIRCUIT BOARD
ILLUSTRATIONS
Change
Information
.
Section 9 REPLACEABLE MECHANICAL PARTS
AND EXPLODED VIEW
Page
3-1
3-2
3-2
3-2
3-2
3-3
4-1
4-1
4-3
4-3
4-3
4-3
4-3
4-15
4-15
4-15
4-15
4-15
5-1
5-1
5-1
5-1
5-2
5-3
5-3
5-3
iii

SG
505
Opt
.
02
Fig
.
No.
2-1
2-2
2-3
2-4
2-5
2-6
2-7
4-1
4-2
4-3
4-4
4-5
4-6
4-7
4-8
4-9
4-10
4-11
5-1
8-1
8-2
8-3
8-4
iv
LIST OF ILLUSTRATIONS
SG 505 Option 02 installation and removal
SG 505 Option 02 front panel controls and connectors
Connection
configurations
Floating oscillator grounded to unit under test to break up ground loops
Added capacitor between CT and chassis ground improves RFI rejection
SG 505 CT terminal grounded and cable shield connected to ground post
Three conductor shielded cable allows CT to be remotely grounded while cable shield is grounded at both
ends ....
Attenuator step
accuracy setup
Distortion
measurement
setup
10
Hz
null
adjustment
10 Hz
harmonic distortion
display
20
Hz
harmonic
distortion
display
20 kHz
harmonic distortion
display
FREQUENCY Hz dial
adjustment
Location of
R1423
,
Amp Cal
Adj
Location
of
R1126 , Bal Adj
Location
of
R1301 , Sync Lvl
Adj
Location of R1339 , Im Ratio Adj
Intermodulation signal LF switch
NOTE
The following illustrations are located in the diagrams foldout section at
the
rear of this
manual
.
Troubleshooting flow
chart oscillator and output circuits
Main
Board
(
A12
)
Troubleshooting flow chart- power supply
Option 02 board ( A13 )
Page
2-1
2-3
2-5
2-6
2-6
2-7
2-7
4-5
4-9
4-9
4-10
4-11
4-12
4-15
4-16
4-17
4-17
4-18
5-3

10
Table
No.
1-1
1-2
1-3
1-4
4-1
4-2
4-3
4-4
4-5
4-6
4-7
5-1
8-1
8-2
8-3
8-4
8-5
8-6
Electrical characteristics
Miscellaneous
Environmental
LIST OF
TABLES
Physical characteristics ...
List
of
test
equipment
requirements
Frequency accuracy check
Attenuator
step
accuracy
Level
flatness check
Level
flatness
check (
alternative
method )
Harmonic
correction
factors
Factors
for
THD
computation
Relative
susceptibility to
static discharge
damage
NOTE
The following tables are located in the diagrams foldout section at the
rear
of this
manual
.
Component
reference
chart
Rear
interface
connector
assignments
Component
reference
chart
Component
reference
chart
Component
reference
chart
Component
reference
chart
SG
505
Opt .
02
Page
1-2
1-4
1-5
1-5
4-1
4-3
4-5
4-7
4-8
4-10
4-11
5-4
V

SG
505 Opt . 02
The
general safety
information
in this
part of the
summary
is
for both operating and servicing personnel . Specific
warnings and
cautions will be
found throughout the
manual
where they apply , but may not appear in this summary .
In This Manual
CAUTION statements identify conditions or practices that
could result in damage to the equipment or other property .
OPERATORS
SAFETY
SUMMARY
WARNING statements identify conditions or practices that
could
result in
personal injury
or loss of life .
TERMS
As
Marked on
Equipment
CAUTION indicates a personal injury hazard not immediate
ly accessible as one reads the marking , or a hazard to prop
erty
including
the
equipment
itself .
In
This Manual
DANGER indicates a personal injury hazard immediately ac
cessible as one reads the marking .
vi
!
SYMBOLS
As
Marked
on
Equipment
4
This symbol indicates where applicable
cautionary
or
other information
is to be
found
.
DANGER
High voltage .
Protective ground ( earth ) terminal .
ATTENTION refer to manual
.
-
Refer to manual
Power
Source
This product is intended to operate in a power module con
nected to
a power
source
that will
not
apply
more
than
250
volts
rms
between the
supply
conductors
or between
either
supply conductor and ground . A protective ground connec
tion
by way
of the
grounding
conductor
in the
power cord
is
essential for safe operation .
Grounding
the
Product
This
product
is grounded
through the
grounding
conductor
of
the
power
module
power
cord . To
avoid
electrical
shock ,
plug the
power
cord
into
a
properly
wired
receptacle
before
connecting to
the
product input or
output
terminals . A pro
tective
ground connection by
way of the
grounding
conduc
tor in the power cord is essential for safe operation .
Danger
Arising
From
Loss
of
Ground
Upon loss
of the
protective
- ground
connection
, all
accessi
ble
conductive
parts ( including
knobs and
controls that may
appear
to be
insulating
)
can render
an
electric
shock
.
Use The Proper Fuse
To avoid fire hazard , use only the fuse specified in the parts
list
for your product
, and which
is
identical
in type
, voltage
rating and current rating .
Refer
fuse
replacement to
qualified service
personnel .
Do Not Operate in Explosive Atmospheres
To
avoid
explosion , do not operate
this product in
an explo
sive
atmosphere
unless it has
been
specifically
certified for
such
operation .
Do
Not
Operate Plug - In
Unit Without
Covers
To
avoid
personal
injury , do not
operate
this
product with
out
covers or panels
installed . Do
not apply power
to the
plug - in
via a
plug
- in
extender
.

SERVICING
SAFETY
SUMMARY
FOR
QUALIFIED
SERVICE
PERSONNEL
ONLY
Refer
also to
the
preceding
Operators
Safety
Summary
Do Not
Service
Alone
Do not
perform
internal
service or
adjustment
of
this
prod
uct
unless
another
person
capable
of
rendering first aid
and
resuscitation
is
present
.
Use
Care When
Servicing
With Power On
Dangerous
voltages
exist
at
several points in this
product
.
To avoid
personal
injury
, do not
touch
exposed
connections
and
components
while
power is
on .
Disconnect
power
before
removing
protective
panels
,
sol
dering
,
or
replacing
components .
SG
505
Opt .
02
Power
Source
This
product
is
intended to
operate in a
power
module con
nected
to
a
power
source that will not
apply
more
than
250
volts rms
between
the
supply conductors or
between either
supply
conductor and
ground
. A
protective
ground
connec
tion by way
of the
grounding
conductor in the power
cord is
essential
for safe
operation
.
Do
Not
Wear
Jewelry
Remove
jewelry
before
servicing
this
instrument
.
Rings
,
necklaces , and
other metallic
objects
could
come into con
tact with
dangerous
voltages
and
currents
.
vii

SG 505 Opt . 02
viii
SOURCE
R
INTERMOD
TEST
SIG
LF
+
FREQ
MIXED
4 : 1
ON
SYNC
OUT
SG
505
OSCILLATOR
VERNIER
9'L
50
01
8
150
-28
-18
Tektronix
OUTPUT
LEVELA
dBm
INTO
800
(
2
+2
-8
+12
-30
FREQUENCY
Hz
CT
-48
BALANCED
OUTPUT
SG
505
Option 02
Oscillator
.
CAL
25
+22
2
+
28
Rs
=
5052
NCAL
X10k
Xik
X100
X10
-25Vpk
ON
GND
FLTG
POWER
4359-01