Tektronix 067-1002-99 User manual

Tektronix, Inc.
P.O. Box 500
Beaverton, Oregon 97077
MANUAL PART NO.
061-2393-00
COMMITTED TO EXCELLENCE
067-1002-99
POWER SUPPLY
CALIBRATION FIXTURE
(for Universal Load Unit)
INSTRUCTION MANUAL
First Printing FEB 1981

Copyright © 1981 by Tektronix, Inc., Beaverton, Oregon.
Printed in the United States of America. All rights reserved.
Contents of this publication may not be reproduced in any
form without permission of Tektronix, Inc.
This instrument, in whole or in part, may be protected by one
or more
U.S. or foreign patents or patent applications.
Information provided on request by Tektronix, Inc., P.O. Box
500, Beaverton, Oregon 97077.
TEKTRONIX is a registered trademark of Tektronix, Inc.

MANUAL REVISION STATUS
PRODUCT: 067-1002-99 Calibration Fixture
This manual supports the following versions of this product: 067-1002-99
REV. DATE DESCRIPTION
@ FEB 1981 Original Issue
067-1002-99 FIXTURE
@

Section 1
Section 2
Section 3
CONTENTS
Page
INTRODUCTION
About This Manual .......................... 1-1
Description of the Module .................. 1-2
SPECIFICATIONS
Physical ................................... 2-1
Electrical ................................. 2-2
Environmental .........................•.... 2-7
Cable ...................................... 2-7
I WARNING l
The remaining portion of this Table of
Contents lists servicing instructions
that expose personnel to hazardous volt-
ages. These instructions are for quali-
fied service personnel only.
POWER SUPPLY PERFORMANCE CHECK
Safety Summary ............................. 3-1
General .................................... 3-2
Equipment Required ............•............ 3-3
Pre par at ion ...........•.................... 3-4
Procedures .................•............... 3-7
NOTE
To adjust the power supply, refer to the
adjustment procedure in the service
manual for the product in which the
supply is installed.
DC Supplies .......... · ................... 3-7
Line Voltages ..........•...•............ 3-17
INIT-0 and PWRFL-0 ...................... 3-18
067-1002-99 FIXTURE @
ii

Section 4
Section 5
Seotion 6
iii
REPLACEABLE ELECTRICAL PARTS
DIAGRAMS AND SCHEMATICS
REPLACEABLE MECHANICAL PARTS
@
067-1002-99 FIXTURE

ILLUSTRATIONS
Figure
Description Page
1-1 The 067-1002-99 Calibration Fixture ........ v
3- 1 -Remote Swi t ch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3- 3
3-2 Performance Check Set-Up ................... 3-4
3-3 Connecting the Load Unit to the
Power Supply ............................... 3-6
3-4
Connecting the Trigger to the
Power Supply ............................... 3-8
3-5 Measuring 40 kHz Ripple .................... 3-10
3-6 Measuring 60 Hz Ripple ..................... 3-15
3-7 Power-Up Waveform ................ -- .......... 3-19
3-8 Power-Down Waveform ................. ~ ...... 3-20
TABLES
Table
Description
Page
2-1 Physical Specification ........ ~ ............ 2-1
2-2 Electrical Specification ................... 2-3
2-3 Interconnect Cable Pin-Out ................. 2-7
3-1 Performance Check Summary .................. 3-12
067-1002-99 FIXTURE
@
iv

Figure 1-1. The 067-1002-99 Calibration Fixture.
v @
067-1002-99 FIXTURE

Section 1
INTRODUCTION
ABOUT THIS MANUAL
This manual describes the 067-1002-99 Calibration Fixture
(Figure 1-1) and its use in servicing of the 620-0295-00 Low
Voltage Power Supply. The manual includes:
• Specifications
• Cable and schematic diagrams
• Parts list
• The performance check procedure for the power
supply.
The following documents contain related information:
• 067-0883-99 Universal Load Unit Instruction Manual.
Refer to this manual for general operating instruc-
tions and for the calibration fixture (plug-in)
theory of operation.
• 620-0295-00 Low Voltage Power Supply Service Manual.
Refer to this manual for power supply schematics,
parts lists, maintenance procedures, and theory of
operation. The Maintenance section contains a proce-
dure to bring up supplies which are not operating
properly or which have been repaired. The manual
also contains an abbreviated performance check
procedure for use in the field.
NOTE
When a Universal Load Unit is available,
the performance check procedure in this
manual should be used in preference to
the procedure in the power supply ser-
vice manual.
067-1002-99 FIXTURE
@
1-1

INTRODUCTION
• The service manual for the product in which the
power supply is installed. To adjust the power
supply, refer to the adjustment procedure in this
manual.
DESCRIPTION OF THE MODULE
The calibration fixture includes two assemblies:
• A personality plug-in for the TEKTRONIX Universal
Load Unit
• A cable harness
The plug-in assembly consists of a metal framework enclosing
a circuit board. An edge connector at the rear of the board
connects it with the load unit. The circuit board includes a
set of resistors which program two load levels for each
channel. These resistors were selected in accordance with
equations given in the appendix to the load unit instruction
manual.
A chart on the front of the plug-in lists the voltage range
for each supply. Channels 1 and 2 are connected in parallel
to the +5 V supply, and Channels 5 and 6 are connected in
parallel to the +55 V supply.
The cable assembly connects the load unit to the power
supply under test.
1-2 @
067-1002-99 FIXTURE

Section 2
SPECIFICATIONS
PHYSICAL
Table 2-1 gives the physical characteristics of the calibra-
tion fixture.
Table 2-1
PHYSICAL SPECIFICATION
Characteristic
Information
rv;odule:
Size
Weight
Cable:
Length
067-1002-99 FIXTURE
Fits Univ er sa 1 Lo ad Unit
plug-in compartment
1.25 lbs (570 gm)
Approximately 5 ft (1.5 m)
@ 2-1

SPECIFICATIONS
ELECTRICAL
Table 2-2 gives the specifications for each load unit
channel. The following definitions explain the column
headings.
Characteristic: Property of equipment.
Performance Requirement: A statement that defines a
characteristic in quantitative terms of performance, usually
in limit form.
Supplemental Information: Statements that explain perfor-
mance requirements or that provide reference information.
The ~erformance reqtiirements are valid only within the
following environmental limits:
2-2
• The calibration fixture is properly seated in a
properly functioning TEKTRONIX 067-0883-99 Universal
Load Unit (ULU).
• The
ULU is operating within its specified environ-
mental limits.
@
067-1002-99 FIXTURE

SPECIFICATIONS
Table 2-2
ELECTRICAL SPECIFICATION
Characteristic
Channel 1a
Voltage
Low load
High load
Out-of-regulation
tolerance
Channel 2a
Voltage
Low load
High load
Out-of-regulation
toleranceO
Performance
Requirement
+5 v
< 1. 57 A
18 Ab
+5 v
<1.43 A
12 A
Supplemental
In formation
Resistance mode
Current mode
Resistance mode
Current mode
10 %
achannels 1 and 2 operate in parallel to provide a maximum
load of 30 A.
bHigh loads are nominal values measured at the ULU.
CDeviation beyond this tolerance turns on the out-of-regula-
tion LED on the ULU. The percentage is substantially greater
than the regulation specified for the power supply (refer to
the power supply service manual).
067-1002-99 FIXTURE
@
2-3

SPECIFICATIONS
Characteristic
Channel 3
Voltage
Low load
High load
Out-of-regulation
tolerance
Channel 4
Voltage
Low load
High load
Out-of-regulation
tol er anc e
Channel 5d
Voltage
Low load
High load
Out-of-regulation
tolerance
Table 2-2 (cont)
Performance
Requirement
+12 v
<250 mA
4 A
+24 v
<150 mA
1. 8 A
+55 v
<102 mA
500 mA
Supplemental
Information
Resistance mode
Current mode
10 %
Resistance mode
Current mode
10 %
Resistance mode
Current mode
7 %
dchannels 5 and 6 operate in parallel to provide a maximum
load of 1.25 A.
2-4 @
067-1002-99 FIXTURE

Characteristic
Channel 6d
Voltage
Low load
High load
Out-of-regulation
tolerance
Channel 7
Not used
Channel 8
Not used
Channel 9
Not used
Channel 10
Voltage
Low load
High load
Table 2-2 (cont)
Performance
Requirement
+55 v
<150 mA
750 mA
-5.2 v
<500 mA
4 A
SPECIFICATIONS
Supplemental
In formation
Resistance mode
Current mode
Resistance mode
Current mode
Out-of-regulation 10 %
tolerance
dChannels 5 and 6 operate in parallel to provide a maximum
load of 1.25 A.
067-1002-99 FIXTURE
@
2-5

SPECIFICATIONS
Characteristic
Channel 11
Voltage
Low load
High load
Out-of-regulation
tolerance
Channel 12
Not used
Channel 13
Not used
2-6
Table 2-2 (cont)
Performanoe
Requirement
-12 v
<130 mA
1 A
@
Supplemental
In formation
Resistance mode
Current mode
10 %
067-1002-99 FIXTURE

SPECIFICATIONS
ENVIRONMENTAL
Re f e r to th e s pe c i f i c at i ons f or th e 067- 0883- 99 Uni ver sa1
Load
Unit.
CABLE
Table 2-3 describes the cable which connects the ULU to the
power supply under test.
Table 2-3
INTERCONNECT CABLE PIN-OUT
ULU
Power Supply
Pin
Assignment
Pin
Assignment
J1
13-14
Channel
10
J73 9·-10
-5. 2 V sup ply
J1
15
Channel
11
J73
8
-12 V supply
J2
1-10
Channels
1' 2
J72
+5 V supply
J2
11-12
Channel
3
J73
1-2
+12 v
supply
J2
13-14
Channel
4
J74
2-3
+24 v
supply
J2
15-16
Channels 5,
6
J74
4 +55 v
supply
J1
2 9-3 1'
Return for
all
J 71 '
+5 return
J2
17-32
channels
J73
3'
Ground
sense
J73 7 '
GND
J74 1
GND
J3
2
Channel 2 sense
J73 4
+5 v
SENSE
067-1002-99 FIXTURE
@ 2-7

Section 3
POWER SUPPLY PERFORMANCE CHECK
SAFETY SUMMARY
WARNING I
The VOE Filter, Line Voltage Selector,
and Inverter boards are connected
directly to the AC lines. To avoid inju-
ry by electrical shock an isolation
transformer should be used during ser-
vicing of these boards.
Do Not Service Alone
Do not perform service or adjustment of the power supply
unless another person capable of rendering first aid and
resuscitation is present.
Wear Safety Glasses
Some internal fault conditions may cause the switching
transistors or other primary components to. explode. To avoid
injury to your eyes wear safety glasses while servicing the
power supply.
Use Care When Servicing With Power On
Dangerous voltages exist at several points in the power
supply. To avoid personal injury do not touch exposed
connections or components while the power is on.
Disconnect power before removing protective panels, solder-
ing, or replacing components.
After the power has been disconnected, the neon flasher on
the Inverter board indicates that dangerous voltages still
are present in the filter capacitors.
067-1002-99 FIXTURE
@
3-1

PERFORMANCE CHECK
I
Power Source
The power supply is intended to operate from a power source
that does 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 ground-
ing conductor in the power cord is essential for safe
operation.
GENERAL
The procedures in this section compare the performance of a
power supply with the electrical requirements given in the
Specification section of the power supply service manual.
The conditions listed in that section must be met in order
for the electrical requirements to be valid.
These procedures are for use on supplies which appear to be
operating properly. For troubleshooting assistance or to
bring up supplies which have been repaired, refer to the
Maintenance section in the power supply service manual.
If the performance on any test does not meet the requirement
and c~nnot be adjusted, repair the power supply and repeat
the entire performance check.
3-2 @
067-1002-99 FIXTURE