Tektronix AM 503 User manual

AM
503
CURRENT
PROBE
AMPLIFIER

7
e
I
d ronbc
INSTRUCTION MANUAL
Tektronix, Inc .
P .O . Box 500
Beaverton, Oregon

97077

Serial Number
COMMITTED TO EXCELLENCE
PLEASE CHECK FOR
CHANGE INFORMATION
AT THE REAR OF
THIS MANUAL .
AM 503
CURRENT PROBE
AMPLIFIER
070-2052-01

First Printing SEP
1976
Product Group 75

Revised DEC
1985

Copyright `'
1976,
1979
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 .
TEKTRONIX,
TEK, SCOPE-MOBILE, and

ilk

are
registered
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 .
INSTRUMENT SERIAL NUMBERS
Each instrument has a
serial number on a
panel insert, tag,
or
stamped on the
chassis . The first number or
letter
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 :
B000000

Tektronix, Inc ., Beaverton,
Oregon, USA
100000

Tektronix
Guernsey, Ltd ., Channel
Islands
200000

Tektronix United Kingdom, Ltd .,
London
300000

Sony/Tektronix, Japan
700000

Tektronix Holland, NV,
Heerenveen,
The Netherlands

TABLE OF
CONTENTS
Page
OPERATOR'S SAFETY
SUMMARY ..... ............... . . .... ..............
SERVICE SAFETY SUMMARY ... ...... .............. . . . .... ..............

V
SECTION 1

OPERATING
INSTRUCTIONS ......... ...... ................

1-1
SECTION 2

SPECIFICATION AND PERFORMANCE CHECK . .
................

2-1
WARNING
The remaining
portion of this Table of Contents lists servicing instructions that expose
personnel to hazardous voltages . These instructions are for qualified
service personnel only .
SECTION 3

ADJUSTMENT ...... ............... ..... ................

3-1
SECTION 4

MAINTENANCE ... . . ................ ..... ...............

4-1
SECTION 5

CIRCUIT DESCRIPTION .............. ..... ................

5-1
SECTION 6

REPLACEABLE
ELECTRICAL PARTS .... . . .... ...............

6-1
SECTION 7

DIAGRAM AND CIRCUIT BOARD ILLUSTRATION
. ...............

7-1
SECTION 8

REPLACEABLE MECHANICAL PARTS
AND EXPLODED VIEW .......

8-1
CHANGE INFORMATION

AM
503
LIST OF
ILLUSTRATIONS
Fig .
No .
Page
No .
1-1 Plug-in installation
and removal ... .............. ....... ..............
1-1
1-2 AM 503
controls and connectors . . . ...............
..... ..............
1-3
2-1 Test setup
for AC Dynamic Range
check
.
. ........... ..... .............
2-7
2-2
Display of tangentially measured
noise .... ............. ........ ........ 2 - 8
3-1 Construction
details for Special Adapter ...... ............ ............
. .
3-3
3-2 Power supply
test point and adjustment
locations . . . ......... .............
3-3
3-3 Gain
and compensation adjustment
locations ....... ..............
.......
3-5
3-4
Example of correct compensation .........
........ .............. . . . . .
3-5
4-1 Lubrication procedure
for a typical cam switch
. . ......... ................
4-2
42 Semiconductor
lead configurations ........... ........
................
4-4
43 Installation
of lead-end connectors ..............
....... ..............
47
44 Circuit board pin and
ferrule assembly .............. ...... ..............
47
5-1 AM 503and
probe waveforms ........ ..............
......... ........
5-1

OPERATOR'S
SAFETY SUMMARY
The followi ng text contai ns a two-part summary of general
safety precautions that must be observed
during all
phases of operation,
service, and repair of this instrument .
OPERATORS SAFETY
SUMMARY
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
manualwhere they apply, but may
not appear in this
summary .
In This Manual
TERMS
CAUTION statements
identify conditions or practices that
could
result i n damage to the equipment or other property .
WARNING statements
identify conditions or practices
that could result in personal
injury or loss of life .
As Marked on Equipment
CAUTION indicates a personal injury hazard
not im-
mediately accessible as one reads the marking, or a
hazard to property including the
equipment itself .
DANGER indicates a
personal injury hazard immediately
accessible as one reads the marking .
In This Manual
SYMBOLS
A
This symbol indicates where applicable
cautionary or other information
is to be
found .
As Marked on Equipment
DANGER - High voltage .
REV A NOV 1979
Power Source
Protective ground (earth)
terminal .
ATTENTION - refer to manual .
This product is intended to operate from 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
connection bywayofthe
groundingconductor in the power cord is essential for
safe operation .
Grounding the Product
This product is grounded through the grounding conduc-
tor of the 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
protective ground connection by way of the grounding
conductor in the power cord is essential for safe
opera-
tion .
Danger
Arising From Loss of Ground
Upon loss of the protective-ground
connection, all
accessible conductive
parts (including knobs and con-
trols
that may appear to be insulating) can render an
electric
shock .
Use the Proper Power Cord
Use only a power cord that is in good
condition .
Use the Proper
Fuse
Use
only the power cord and connector specified for your
product .
Refer cord and connector changes to qualified service
personnel .
To avoid fire hazard, use only the fuse of correct
type,
voltage rating and current
rating as specified in the parts
list for your product
.
Refer fuse replacement to qualified service personnel .

AM 503
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
.
Do Not Remove
Covers or Panels
To avoid personal
injury, do not remove the
product
iv
covers or
panels . Do not
operate the product
without the
covers and panels
properly installed .
Do Not
Operate Without
Covers (for TM 500
plug-
ins
only)
To avoid personal
injury, do not
operate this product
without covers or panels
installed .
Do not apply
power to
the plug-in
via a plug-in
extender .
REVA NOV
1979

Do Not Service Alone
REVA NOV 197 9
SERVICING SAFETY SUMMARY
FOR QUALIFIED SERVICE
PERSONNEL ONLY
Do not perform internal service
or adjustment of this
product 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
connec-
tions and components while power is
on .
Refer also to the preceding
Operators Safety
Summary .
AM 503
Disconnect power before
removing protective panels,
soldering, or
replacing components .
Power Source
This product is
intended
to
operate from 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
connection by way of the
grounding conductor
in the power cord is essential for
safe operation
.
v

AM 503
2052-9
REVA
NOV 197 9

All
references
to the P6302 probe also apply to the
A6302 probe .
All
references to the P6303 probe also apply to the
A6303
probe .
Description
OPERATING
INSTRUCTIONS
NOTE
The AM 503 Current
Probe Amplifier is designed for
use with any of the compatible
current probes (see
Mechanical Parts
list for accessories) . The input
attenuator is
calibrated in a 1, 2, 5 sequence, and the
attenuator
knob-skirt illumination provides
direct indica-
tion of current/division . An auto-scale
switch changes the
knob-skirt illumination automatically to
match the sen-
sitivity of the probe used .
Bandwidth is selectable for either FULL
(limited by
current probe in use) or 5 MHz
.
Input
coupling is selec-
table (ac or dc) ; ac provides a
means of measuring low
amplitude ac
signals on a high level do current .
Installation and Removal
RELEASE LATCH
PULL TO REMOVE
(1431-21)2052-37
REVJUN 198 1
Fig
.
1-1
.
Plug-in
installation and removal .
Section
1-AM 503
The AM 503 operates
in TEKTRONIX TM 500-Series
power modules
only . It will operate i n any compartment of
a multiple-compartment
power module .
Turn
the power module off before inserting the plug-
in ; otherwise, damage may occur to the plug-in
circuitry . It is also recommended that the
power
module be turned off before
removing the AM
50,'~
Refer to Fig .
1-1 . Check to see that the plastic
barriers
on the interconnecting jack of the selected
power module compartment match the cut-outs in
the AM 503 circuit board edge
connector .
Alignthe upper and lower groove of the AM 503 chassis
with the upper and lower guides of the selected compart-
ment . Push the module in and press firmly to seat the
circuit board in the interconnecting jack .
To remove the
AM 503, pull on the release latch