KEPCO ATE 1/4 RACK User manual
MODEL
INSTRUCTION MANUAL
IMPORTANT NOTES:
1) This manual is valid for the following Model and associated serial numbers:
MODEL SERIAL NO. REV. NO.
2) A Change Page may be included at the end of the manual. All applicable changes and
revision number changes are documented with reference to the equipment serial num-
bers. Before using this Instruction Manual, check your equipment serial number to identify
your model. If in doubt, contact your nearest Kepco Representative, or the Kepco Docu-
mentation Office in New York, (718) 461-7000, requesting the correct revision for your par-
ticular model and serial number.
3) The contents of this manual are protected by copyright. Reproduction of any part can be
made only with the specific written permission of Kepco, Inc.
Data subject to change without notice.
KEPCO®
THE POWER SUPPLIER™
ORDER NO. REV. NO.
KEPCO, INC. !131-38 SANFORD AVENUE !FLUSHING, NY. 11352 U.S.A. !TEL (718) 461-7000 !FAX (718) 767-1102
email: hq@kepcopower.com !World Wide Web: http://www.kepcopower.com
KEPCO INC.
An ISO 9001 Company.
ATE 100-0.5M F19688 9
©1999, KEPCO, INC.
ATE 1/4 RACK
POWER SUPPLY
AUTOMATIC TEST EQUIPMENT
ATE 1/4 RACK
POWER SUPPLY
NOTE This on-line version of the Technical
Manual includes only installation and
operating instructions. For the complete
manual, please contact Kepco.
Declaration
of
Conformity
Application
of
Council directives:
Standard to which Conformity is declared:
73/23/EEC
(LVD)
93/68/EEC
(CE
mark)
EN61
010-1
:1993 (Safety requirements for electrical equipment for measurement,
control and laboratory use)
Manufacturer's Name and Address:
Importer's Name and Address:
Type of Equipment:
Component
Power
Supply
Model No.: [PRODUCTMODEL NUMBER]
Year
of
Manufacture:
I,
the undersigned, declare that the product specified above, when used
in
conjunction with the condi-
tions of conformance set forth
in
the product instruction manual, complies with the requirements
of
the
Low Voltage Directive 73/23/EEC, which forms the basis for application of the CE Markto this product.
Place: KEPCO Inc.
131-38 Sanford Ave.
Flushing, N.Y.11352 USA
Date:------
228-1348 DC-COMP/INST062399
Saul Kupferberg
(Full Name)
VP
OF
SALES
(position)
A
Conditions of Conformance
When this product is used in applications governed by the requirements
of
the EEC, the following restric-
tions and conditions apply:
1.
For European 'pplications, requiring compliance to the LowVoltage Directive, 73/23/EEC, this power
supply is considered a component product, designed for "built in" applications. Because it
is
incom-
plete
in
construction, the end product enclosure must provide for compliance to any remaining electri-
cal safety requirements and actas a fire enclosure. (EN61010-1 Cl. 6, Cl.
7,
CI.B,
Cl. 9 and EN61010-
1 annex F)
2. This power supply is designed for stationary installation, with mains power applied via a detachable
power supply cord orvia directwiring to the source power terminal block.
3.
This power supply is considered a Class 1 (earthed) product, and as such depends upon proper con-
nection to protective earth for safety from electric shock. (EN61 010-1 Cl. 6.5.4)
4.
This power supply is intended for use as part
of
equipment meant for test, measurement and labora-
tory use, and is designed to operate from single phase, three wire power systems. This equipment
must be installed within a suitably wired equipment rack, utilizing a three wire (grounded) mains con-
nection. See wiring section
of
this manual for complete electrical wiring instructions. (EN61010-1 Cl.
6.5.4 and Cl.6.10.1)
5.
This power supply has secondary output circuits that are considered hazardous, and which exceed
240
VA
at a potential
of
2V
or more.
6. The outputwiring terminals
of
this power supply has not been evaluated for field wiring and, therefore,
must be properly configured by the end product manufacturer prior to use.
7.
This power supply employs a supplementary circuit protector in the form
of
a circuit breaker mounted
on the front panel. This circuit breaker protects the powersupply itselffrom damage in the event
of
a
fault condition. For complete circuit protection ofthe end product, as well as the building wiring, it
is
required that a primary circuit protection device be fitted to the branch circuit wiring. (EN61
01
0-1
Cl.
9.6.2)
8.
Hazardous voltages are present within this power supply during normal operation. All operator adjust-
ments to the prcilduct are made via externally accessible switches, controls and signal lines as speci-
fied within the product operating instructions. There are no user or operator serviceable parts within
the product enclosure. Refer all servicing to qualified and trained Kepco service technicians.
B 228-1351 COND/CONFORM 062399
1.
Installation, Operation and Service Precautions
This product is designed for use in accordance with EN 61010-1 and UL 3101 for Installation Category 2,
Pollution Degree 2. Hazardous voltages are present within this product during normal operation. The
product should never be operated with the cover removed unless equivalent protection
of
the operator
from accidental contact with hazardous internal voltages is provided:
2.
Grounding
There are no operatorseJViceable parts oradjustmentswithin the product enclosure.
Refer all seJVicing to trained
seJVice
technician.
Source power must be removed from the product priorto performing any seJVicing.
This product is factory-wired for the nominal a-c mains voltage indicated on the rat-
ing nameplate located adjacent to the source power connection on the product's rear
panel.
To
reconfigure the product input for other nominal mains voltages as listed
herein, the product must be modified
by
a trained
seJVice
technician.
This product is a Class 1 device which utilizes protective earthing to ensure operator safety.
The PROTECTIVE EARTHING CONDUCTOR TERMINAL must be properly con-
nected prior to application
of
source powerto the product (see instructions
on
instal-
lation herein) in orderto ensure safety from electric shock.
PROTECTIVE EARTHING CONDUCTOR
TERMINAL-
This symbol indicates the
point
on
the productto which the protective earthing conductor must be attached.
EARTH (GROUND) TERMINAL -This symbol is used to indicate a point which is
connected to the PROTECTIVE EARTHING TERMINAL. The component installer/
assembler must ensure that this point is connected to the PROTECTIVE EARTH-
ING TERMINAL.
CHASSIS TERMINAL -This symbol indicates frame (chassis) connection, which is
supplied as a point
of
convenience for performance purposes (see instructions
on
grounding herein). This is notto
be
confused with the protective earthing point, and
may not
be
used
in
place
of
it.
3.
Electric Shock Hazards
This product outputs hazardous voltage and energy levels as a function
of
normal operation. Operators
must be trained
in
its use and exercise caution as well as common sense during use to prevent accidental
shock. This symbol appears adjacent to any external terminals at which hazardous voltage
levels as high as
SOOV
d-e may exist in the course
of
normal
or
single fault condi-
tions.
This symbol appears adjacent to any external terminals at which hazardous voltage
levels
in
excess
of
SOOV
d-e may exist in the course
of
normal or single fault condi-
tions.
228-1352
SAFETY-
(COVER REMOVAL) 062399
C/(0
BLANK)
TABLE OF CONTENTS
PARAGRAPH
PAGE
SECTION I - INSTRUCTION
1-1
Scope
of
Manual
......
.
..............................................
1-1
1-3 General
Description....
.
...........................................
1-1
1-9 Specifications,
Electrical.
. . .
..........................................
1-2
1-10 Miscellaneous Featrues
................................................
1-5/1-6
1-11 Mechanical
Specifications
..............................................
1-5/1-6
1-12 Accessories
........................................................
1-5/1-6
2-1
2-3
24
2-6
2-8
2-10
2-13
2-14
3-1
3-3
3-6
3-12
SECTION
II-
INSTALLATION
Unpacking
and Inspection
................................................
.2-1
Terminations
...................................................
2-1
A-C
Input
Reljurrcrnents
.................................................
.2-4
Cooling . .
.......................................
.2-4
Preliminary
Check-Out.
Installation
..
.
...............................
.2-4
.
............................................
.2-5
Grounding
..........................................................
.2-5
Fast Mode Conversion
of
the
ATE
Power
Supply
..................................
2-6
SECTION
Ill-
OPERATION
Gener·al
....
Safety
Grounding
D-C
Output
Grounding
...
Power
Supply/Load
Interface
............
3-1
...................
3-1
.
...............
3-1
................................
3-2
3-16 Load
Connection,
General. . . .
..............................
3-3
3-19 Load
Connection,
Method
I (Local
Error
Sensing)
.................................
3-4
3-21
Load
Connection,
Method
II
(Remote
Error
Sensing)
...............................
3-4
3-24 Load Connections,
Method
Ill
. . . . . . . . . . . . . . . . . . .
..............
3-5
3-27 Standard
Voltage
Mode
Operation
(Front
Panel
Control)
............................
3-5
3-29
3-31
3-34
3-37
3-41
345
3-51
3-57
3-60
3-64
3 70
3-77
3-75
3-78
3-84
3-91
394
]10]
3115
3
121
ATE
1/4---2078
Standard
Current
Mode
Operation
(Front
Panel
Control)
......................
3-6
Overvoltage
Crowbar,
Setup and Check
........................................
3-6
Introduction
to Remote
Control
of
the
ATE
Output
...............................
3-7
Programming the Voltage Control Channel .
.....................................
3-7
Output
Control
with
an
External
0-10
Volt
D-C
Control
Signal
........................
3-7
Voltage
Control
with
a
Two-Terminal
Resistance
..................................
3-8
Voltage
Control
with
a High Impedance
Control
Source
.............................
3-10
Programming the Current Control Channel .
.....................................
3-12
Output
Current
Control
with
an
External
Control
Signal
.............................
3-12
Output
Current
Control
with
a
Two-Terminal
Resistance
............................
3-13
Programming the Overvoltage Protector. . . . . . . . . . . . . . . . . . . .
..............
3-15
R8rnote
Crowbar
Level
Control
with
an
[xwrnal
0--10
Volt
D-C 1
mA
Signal
...................................
:
.....
3-15
Automatic
(Trackir1g)
Control
of
the
Crowbar
Level
...............................
3-16
Programming Output Voltage
and
Output Current Simultaneously
......................
3-17
The
USE-1
uf
the
"EXT.
CURRENT
COMPARISON
AMPLIFIER"
for
GenNal Feedback
Control
..............................................
3-19
Multirle
Pow8r
Supply
and Systems
Operation
...................................
3-20
Sc:ries
Operation
of
ATE
Power
Supplies.
. . . . . . . . . . . . .
..............
3-21
Parallf~l
Operation
of
ATE
Power Supplies
......................................
3-25
Prowarnming
With
Reference
to
the
NEGATIVE
Power
Supply
Output
....
.............
3-32
Application
Df Isolated Flag Signals
.................
3-34
i-
PARAGRAPH
4-1
4-12
4-19
51
5-3
5-4
5-9
5-13
PAGE
SECTION
IV-
THEORY
OF OPERATION
Simplified
Diagram Discussion (General
Circuitry).
.........
.4-1
Simplified
Diagram Discussion (Overvoltage Protector
Circuit)
.........
.
.....
.4-3
Circuit
Description,
Based
on Main Schematic Diagram
......
.
.............
.4-4
SECTION
V-
MAINTENANCE
Gener~l
. . . . . . . . . .
.....................................
5-1
Disasspmbly
..........................................................
5-1
lnter~al
Adjustment
Procedures
.............................................
5-2
Trou~le
Shooting
......................................................
5-2
Powe1
Supply
Measurements
...............................................
5-3
i
SECT~ON
VI
-PARTS
LIST
AND
DIAGRAMS
6-1
Gener~l
. . . . .
............................................
6-1/6-2
6-3 Ordering
Information.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.......
6-1/6-2
FIGURE
1-1
1-2
2-1
2-2
2-3
2-4
2-5
2-6
3-1
3-2
3-3
3-4
3-5
3-6
3-7
3-8
3-9
LIST OF ILLUSTRATIONS
PAGE
Kepccj
ATE
Power Supplies. . . .
........................................
v/vi
Mech~nical
Outline
Drawing
............................................
1-7/1-8
'
Location
of
Internal
Controls
...............
.
............
2-1
Contrpls and
Terminations
(Front)
.............
. .
.......................
2-2
Termirations
(Rear)
....
............
2-3
A-C
l~put
Source Selection
................................................
2-4
Location
of
the Internal Signal
Ground
........................................
2-5
Required Steps
for
"Slow
Mode/Fast
Mode"
Conversion
.............................
2-6
Typical
Output
Impedance
Curve.
. . . . . . . . . . . . . . . . . . . . . . . .
.............
3-2
Standrrd
Jumper
Link
Connections . . . . . . . . . . . . . . . .
..........
3-3
Load K=onnection,
Method
I.
. . . . . . . . . . . . . . . . . . . . . .
..........
3-4
Load
Connection,
Method
II . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.....
3-4
~~J~~~o~~~~::~;~·o~~r~
1
1°~
~~~
a.n.
~
x·t~rn~
I
.......................................
3-5
(0-1
d
Volt,
1
mA)
DC
Control
Srgnal . . . . . .
......
.
Two-ferminal
Resistance Proqrarnrning
of
the Voltage Channel
UsingiPREAMP
"A"
and the Internal Reference Source
........
.
Conn~ctions
for
Voltage
Control
With
a
Two-Terminals
Resistance
..
UsingiPREAMP
"A"
to
Generate the
0-10
Volt@
1 rnA
Contrbl
Potential
from
a High Impedance Source
..
.
..............
3-8
.
......
3-8
.
.....
3-9
.
..
3-10
3-10
Conn~ctions
for
Voltage
Control
With
a High Impedance lnpu t Source
...................
3-11
3-11
3-12
3-13
3-14
315
3-16
317
. .3-12
Conn~ctions
tor
Output
Current
Control
With
a
0-1
\folt
Control
Signal (Kepco
SN
Programmer)
........
.
Two-terminal
Resistance Programming
of
the
Current
Channel
UsingiPREAMP
"B"
and the Internal Reference Source
.............................
3-13
Corm4ctions
for
Output
Ctment
Control
With
a
Two-terminal
Resistance
..
Remo~"
Crowbar Level
Control
With
an
External Signal
Source.
. .
......
. .
............
3-14
.
..
3-15
Conn~ctions
tor
Simultaneously Programming
the
O~Jtput
Voltage and the
Crowbar
Level
(Automatic
Tracking)...
. .3-16
Conndctions
for
Simultaneous
Control
of
the
Output
Voltage/Output
Current
..............
3-17
lllurnilnation
Control
Circuit
With
the
ATE
Power
Supply
............................
3-19
-
ii-
ATE
1/4-2078
FIGURE
3-18
LIST OF ILLUSTRATIONS (cont'd.)
Connections for
Illumination
Control,
Using the
EXT.
CURRENT
COMPARISON
AMPLIF-IER.
Multiple
Power Supply Fault Detection Loop
.......
.
PAGE
.
..........................
3-20
.
........................
3-21
3-20
Automatic
Series
Connections
..............................................
3-22
3-21
Developing the Drive for Master/Slave Series Connection,
ATE
Power Supplies
With
More Than 6
Volt
Output
Voltage
..........................
3-23
3-22 Master
Slave
Series Connection,
ATE
Power Supplies
With
> 6
Volt
Output
Voltage
.............................................
3-24
3-23 Developing the Driver
for
Master/Slave Series Connection,
for 6
Volt
ATE
Supplies
..................................................
3-25
3-24
"Automatic"
Parallel Operation,
Output
Graph
...................................
3-26
3-25 Connections
for
Automatic
Parallel Operation
...................................
3-27
3-27 Location
of
the Overvoltage Sensing
Lead
Disconnect
..............................
3-30
3-28 Redundant Parallel Connection
.............................................
3-31
3-29 Programming With Reference
to
the
NEGATIVE
Output
of
the
ATE
....................
3-32
3-30 Connections
for
Programming
With
Reference
to
the
NEGATIVE
Output
of
the
ATE.....
.
....................................
3-33
3-31
Isolated Flag Signal Outputs
...............................................
3-34
4-1
Crossover Characteristics,
ATE
Power Supply
...................................
.4-1
4-2 Voltage Comparison Equivalent
Circuit
. .
....................................
.4-1
4-3 Current Comparison Equivalent Circuit
.......................................
.4-2
4-4 Generation
of
the Internal Control Signal
for
the
ATE
Voltage
and
Current Channels
..........................................
.4-2
4-5 Generation
of
the Internal Crowbar Level Signal
.................................
.4-3
4-6
ATE
Simplified Schematic Diagram, General
Circuitry
...........................
4-7/4-8
4-7 Programmable Overvoltage Protector and Crowbar Circuit,
Simplified Schematic Diagram
...........................................
4-9/4-10
5-1
Disassembly
of
the
ATE
Power Supply
........................................
5-1
5-2 Test Set-up Diagrams
for
Output
Effect
Measurements
...........................
5-5/5-6
6-1
Component Location, Main
Chassis
Assembly With
Front
Panel
and Heat Sink Assembly
..............................................
6-17/6-18
6-2 Component Location, Control Assembly
...................................
6-19/6-20
6-3 Main Schematic Diagram
..............................................
6-21/6-22
TABLE
1-1
1-2
2-1
2-2
2-3
ATE
l/4-2078
LIST OF TABLES
PAGE
D-C
Output
Ratings,
ATE
Power Supplies
......................................
1-2
Output
Effects, Offset Variations and Ripple Specifications
..........................
1-3
Internal Controls and Their Functions
.........................................
2-1
Controls and Terminations,
Front
Panel.
......................................
.2-2
Rear
Terminations
......................................................
2-3
-
iii/iv-
ATE
A-E-2078
FIG.
1-1
KEPCO
ATE
POWER
SUPPLIES.
(From
Top:
Size A,
B;
Size C;
SizeD;
Size E).
-
v/vi-
SECTION I - INTRODUCTION
1-1
SCOPE
OF
MANUAL
1-2 This manual contains
instructions
for
the
installation,
operation
and maintenance
of
the
"ATE"
series
of
voltage
and
current
stabiliLed d-e power supplies,
manufactured
by
Kepco, Inc., Flushing, New
York,
U.S.A.
1-3
GENERAL
DESCRIPTION
1-4 The Kepco
ATE
with
programmable overvoltage
protector
is
a precision stabilized
power
supply
which
can
deliver
either
stabilized
output
voltage or
current.
The prevailing operating rnode
is
indicated
by
LED
mode
indicators
at the
front
panel. Operating mode crossover
is
automatic
and may
be
monitored
remotely
by
means
of
a flag signal, available at the rear
programming
connector.
The
power
supply features
"full
range"
output
control
by
means
of
1
0-turn,
high
resolution
front
panel
potentiometers.
A pair
of
front
panel meters con-
stantly
monitor
the
output
voltage and
output
current.
This
power
supply
has
a linear and
fully
dissipative NPN
pass
transistor section driven
by
high-gain, integrated
circuit
amplifiers. The
output
of
the
power
supply
is
fully
programmable.
All
necessary
input
terminals are provided on a
programming
connector
at the rear
of
the
chassis. Terminals are also provided
for
remote
error
sensing,
as
well
as
for
the
connection
of
the
output
capaci-
tor
directly
at
the
load.
1-5 The
ATE
power
supply features user-selectable
"slow"
or
"fast"
operating modes. Slow mode operation
is
recommended
for
applications
demanding a constant voltage source. Fast mode
operation
is
best
if
the
output
voltage must change
rapidly,
either in response
to
an
external programming signal or,
if
the
ATE
is
used
as
a
current
stabilizer,
as
a reaction
to
changing load resistaf1ce.
1-6 The
ATE
power supply
is
delivered for "slow mode" operation.
See
Section
II,
par. 2-4 for converting
the
ATE
power
supply
to "fast mode" operation.
1-7
An
overvoltage
protection
circuit,
continuously
adjustable
as
well
as
remotely
programmable,
is
a
built-in
feature. The trigger
point
of
the overvoltage
protector
may
be
set
(or
checked) under actual operating condi-
tions
by
the
front
panel accessible setup
controls
(refer
to
Section II
of
this
manual).
1-8
ATE
power
supplies are
built
in several mechanical
sizes
according
to
their
approximate
output
power
ratings:
SIZE PACKAGE APPROX.OUTPUTPOWER
l'A"
QUARTER-RACK
MODELS
50
WATT
''B"
QUARTER-RACK
MODELS
100
WATT
''C"
HALF-RACK
MODELS
250WATT
''D"
THREE-QUARTER
RACK MODELS 500
WATT
''E''
FULL-RACK
MODELS
1000WATT
Power transistors and drivers on all
ATE
designs are
mounted
onto
highly
efficient,
patented heat sink assem-
blies
which
are cooled
by
low-noise fans. The
ATE
main chassis assemblies,
as
well
as
the wrap-around covers,
are constructed
from
cold-rolled
ste\1.
The
front
panels
are
made
from
aluminum
(refer
to
the "Mechanical
Outline
Drawing",
FIG.
1-2).
ATE
A-E-2078
1-1
1-9 SPECIFICATION, ELECTRICAL
a)
AC INPUT SOURCE
VOLTAGE
AC
INPUT
SOURCE
CURRENT
(Worst Case,@
113V
a-c,
95-113V
a-c
tap, Full Load)
SIZE A SIZE B SIZE C SIZE 0 SIZE E
95
to
113V
a-c
o}
Selectable,
105
to
125V
a-c
or
See
Section II
190
to
226V
a-cor
of
this Manual
210 to
250V
a-c
1.4 A 2.4 A 6.0 A
11.0A
20.0A
b) DC OUTPUT
RATINGS
See
Table 1-1.
Size
"A"
Quarter-
R~ck
Models
d·c
OUTPUT
OUTPUT
IMPEDANCE
VOLTAGE
MODE
OUTPUT
IMPEDANCE
CURRENT
MODE
MODEL
RANGE
SERIES SERIES
INDUCTANCE
SHUNT"
SHUNT
CAPACITANCE
VOLTS
AMPS
RESISTANCE
SLOW
FAST
RESISTANCE
SLOW
FAST
ATE
6-5M
0-6 0-5
24
1'0
0.51'H 51'H
12
kO
1,000 I'F 11'F
ATE 15-3M
0-15
0-3
100
1'0
0.51'H 51'H 30
kO
450 I'F 0.41'F
ATE 25-2M
0-25
0-2
!150
1'0
11'H
10
I'H
50
kO
250 I'F 0.251'F
ATE 36-1.5M
0-36
0-1.5
_1180
1'0
11'H
10
I'H
72
kO
200
I'F 0.2 I'F
ATE 55-1M
0-55
0-1
1.1
mo
21'H 20 I'H 110
kO
1501'F 0.15
JLF
ATE 75-0.7M
0-75
0-0.7 2.15
mo
2/'H
20
I'H 150
kO
110 I'F 0.11'F
ATE 100-0.5M 0-100 0-0.5 4
mo
41'H
40
I'H 200
kO
50
I'F 0.051'F
ATE
150-0.3M 0-150 0-0.3
10
mo
41'H
40
I'H 300.k0 551'F 0.021'F
Size
"B"
Quarter-
R;:tck
Models
d·c
OUTPUT
O~TPUT
IMPEDANCE
VOLTAGE
MODE
OUTPUT
IMPEDANCE
CURRENT
MODE
MODEL
RANGE
'SERIES
SERIES
INDUCTANCE
SHUNT"
SHUNT
CAPACITANCE
VOLTS
AMPS
RtSISTANCE
SLOW
FAST
RESISTANCE
SLOW
FAST
ATE
6-10M
0-6
0-10
121'0 0.51'H 51'H
12
kO
1,800 I'F 2 I'F
ATE 15-6M
0-15
0-6
50
1'0
0.5l'_H 51'H
30
kO
1000 I'F 0.81'F
ATE 25-4M
0-25
0-4
1251'0 11'H
10
I'H 50
kO
500
I'F 0.51'F
ATE 36-3M
0-36
0-3
240
1'0
11'H
10
I'H
72
kO
350
I'F 0.4 I'F
ATE 55-2M
0-55
0-2
0:55
mo
21'H
20
I'H 110
kO
200 I'F 0.31'F
ATE 75-1.5M
0-75
0-1.5 1
mo
21'H
20
I'H 150
kO
110
~F
0.21'F
ATE 100-1M 0-100 0-1 2
mo
41'H
40
I'H
200
kO
80
~tF
0.11'F
ATE 150-0.7M 0-150 0-0.7 4
mo
41'H
40
I'H 300
kO
55
I'F 0.04 I'F
Size
"C"
Half-
R,ack
Models
d·c
OUTPUT
OUTPUT
IMPEDANCE
VOLTAGE
MODE
OUTPUT
IMPEDANCE
CURRENT
MODE
MODEL
RANGE
SERIES SERIES
INDUCTANCE
SHUNT"
SHUNT
CAPACITANCE
VOLTS
AMPS
RIESISTANCE
SLOW
FAST
RESISTANCE
SLOW
FAST
ATE 6-25M 0-6 0-25 4.8
Jill,
0.5
!<H
5!<H 12
kfi
11,000
!<F
5~
ATE 15-15M 0-15 0-15 20
jill
0.51-'H 51-'H 30
kfi
5,800
!LF
2
!LF
ATE25-10M
0·25
0-1Q
pOJ,tfi 1
ILH
10
!<H
50
kfi
2,900
!<F
1.25
!<F
ATE 36-8M 0-36
Q-8
~!ill
1
gH
101£H
72kfi
2,400_pF 11-'F
ATE 55-5M 0-55 0-5
o.22mn
2
!<H
20
!<H
110
kfi
1,400
!LF
0.75
!<F
ATE 75-3M 0-75 0-3
0.5mfi
21L_H
20
l'.H
150
kfi
850_pF
0.51-'f
ATE 100-2.5M 0-100 0-2.5
0.8mfi
4
!<H
40
!<H
200
kfi
375!-'F 0.25
!<F
ATE 150-1.5M 0-150 0-1.5
2mfi
4
!<H
40
!<H
300
kfi
275
!<F
0.1
!<F
ATE 325·0.8M 0-325 0-0.8
~.1
mn
100
1-'H
1 mH
650
kfi
180
1-'F
0.01
1-'F
Size
"0"
Three-
Qu~arter-
Rack
Models
d·c
OUTPUT
bUTPUT
IMPEDANCE
VOLTAGE
MODE
OUTPUT
IMPEDANCE
CURRENT
MODE
MODEL
RANGE
I
SERIES
SERIES
INDUCTANCE
SHUNT"
SHUNT
CAPACITANCE
VOLTS
AMPS
~ESISTANCE
SLOW
FAST
RESISTANCE
SLOW
FAST
ATE
6-50M
0-6
0-50
2.4
1'0
0.51'H 51'H
12
kO
12,000 I'F
10
I'F
ATE 15-25M
0-15
0-25
12
1'0
0.51'H 51'H
30
kO
8,000 I'F 41'F
ATE 25-20M
0-25 0-20
251'0 11'H
10
I'H 50
kO
5,800
~tF
2.51'F
ATE 36-15M
0-36 0-15
481'0 11'H
10
I'H
72
kO
4,900 I'F 2 I'F
ATE 55-10M
0-55
0-10
p.11
mo
21'H
20
I'H 110
kO
2,900 I'F 1.51'F
ATE
75-8M
0-75
0-8
p.19
mo
21'H
20
I'H 150
kO
1,200 I'F 1 I'F
ATE 100-5M 0-100
0-5
0.4
mo
41'H
40
I'H 200
kO
600 I'F 0.5 I'F
ATE 150-3.5M 0-150 0-3.5
0.86
mo
41'H
40
I'H
300
kO
440 I'F
0.2
I'F
Size
"E"
Full-
Rack!
Models
'
d·c
OUTPUT
OUTPUT
IMPEDANCE
VOLTAGE
MODE
OUTPUT
IMPEDANCE
CURRENT
MODE
RANGE
SERIES SERIES
INDUCTANCE
SHUNT'
SHUNT
CAPACITANCE
MODEL
VOLTS
AMPS
!RESISTANCE
SLOW
FAST
RESISTANCE
SLOW
FAST
ATE 6-100M
0-6
0-100 ' 1.21'0 0.51'H 51'H
12
kO
22,000 I'F
15
I'F
ATE 15-50M
0-15 0-50
61'0 0.51'H 51'H 30
kO
12,000 I'F 61'F
ATE 25-40M
0-25 0-40
12.51'0 11'H
10
I'H
50
kO
11,000 I'F 4 I'F
ATE 36-30M
0-36 0-30
24
1'0
11'H
10
I'H
72
kO
9,500 I'F 3 I'F
ATE 55-20M
0-55 0-20
55
1'0
21'H
20
I'H 110
kO
5,200 I'F 2.251'F
ATE 75-15M
0-75 0-15
0.1
mo
21'H
20
~tH
150
kO
3,400 I'F 1.5 I'F
ATE 100-10M 0-100
0-10
0.2
mo
41'H
40
I'H 200
kO
1,200 I'F 0.751'F
ATE 150-7M 0-150
0-7
0.42
mo
41'H
40
I'H
300
kO
1,050
I'F
0.31'F
"Based on
0.5
rnA load effect
in
FAST mode.
1-2
TABLE
1-1
DC
OUTPUT
RATINGS,
ATE
POWER SUPPLIES. ATE
A-E-07-0780A
c)
OUTPUT EFFECTS, OFFSETS AND RIPPLE SPECIFICATIONS: See Table
1-2.
INFLUENCE QUANTITY OUTPUT EFFECTS VOLTAGE MODE OUTPUT EFFECTS CURRENT MODE OFFSETS(4)
Typical
Maximum
Typical
Maximum
AEio Alio
SOURCE
VOLTAGE (min.-max.): <0.0005% E0 max. 0.001% E0 max. <0.002% 1
0 max. 0.005% 1
0 max. <1
p.V
<1
nA
LOAD (no load-full load): <0.001 %E0 max. 0.002% E0 max. <0.5
mA(
1l 1
mA(1)
<1
p.V
<1
nA
TIME (8-hour drift): <0.005%E0 max. 0.01% E0 max. <0.01% 1
0 max.
0.02%1
0 max. <20p.V <1
nA
TEMPERATURE, per "C: <0.005% E0 max. 0.01% E0 max. < 0.01% 1
0 max. 0.02% 1
0 max. <20p.V
<2
nA
RIPPLE AND
NOISE(2)
rms: <0.1
mV
0.3
mV
<0.01% 1
0 max. 0.03% 1
0 max. -
(Slow Mode)
p-p:(3)
<1
mV
3mV
<0.1%
1
0 max. 0.3% 1
0 max. -
RIIPPLE
AND
NOISE(2)
rms: <1
mV
3
mV(5)
<0.01% 1
0 max. 0.03% 1
0 max. -
(Fast Mode)
p-p:(3)
<10
mV
30
mV(5)
<0.1%
1
0 max. 0.3% 1
0 max. -
(1)
For models with output current rating of 50A and higher, the load effect is 2 mA typical and 5 mA maximum.
In
slow mode, the leakage current through the output capacitor adds approximately
0·6
mA to the current mode load effect.
(2)
One terminal must
be
grounded for this measurement, or connected so that common mode current does not flow through the
load
or,
in current mode, through the current sensing resistor.
(3)
Peak-to-peak ripple is measured over a
20
Hz
to
10
MHz bandwidth.
(4) Preamplifier offsets. The preamplifier offsets are given for the calculation
of
the output effects of preamplifiers
(A,
B)
if
either
of
these amplifiers is used for operational programming.
In
this case, the value
of
the external feedback and input resistors, the
amplifier offsets and the reference voltage variations are combined in the "Error Equation", which represents the
"worst
case"
output effects for the application at hand:
where:
~Eo
(preamp)
~Eref
~Eio
~lio
Rf
Ri
~E
0
(preamp) =
~Eref
(Rf/Ri) +
~Eio
(1
+ Rf/Ri) +
~lio
Rf.
= Total Preamp Output Voltage Change.
= Change
in
the Voltage Reference.
=Change
in
Offset Voltage.
= Change in Offset Current.
= External Feedback Resistor.
= External Input Resistor.
NOTE
1:
Variations in the value
of
the feedback and input resistors are considered secondary effects
in
the error equation.
-
-
-
-
NOTE
2:
In the Voltage Mode
of
operation, the calculated preamp output effect,
~Eo
(preamp), must
be
multiplied
by
the (fixed) gain of
the
ATE
voltage channel to find the total output effect on the output voltage
of
the
ATE
power supply. The (fixed) gain of the
ATE
voltage channel is given by: GAIN = E0 max/10, where "E0 max." is the maximum rated output voltage of each
ATE
model.
In
the Current Mode of operation, the effect
of
the preamplifieroffsets
on
the total outp•1t current may
be
expressed as a percen·
tage
of
1
0 max. by the equation:
~Eo
(preamp)
~1
0
(%) = x 100%
1 Volt
(5)
For Kepco Model
ATE
325-0.BM, the maximum output ripple and noise is 10mV rms and 50mV
p-p.
TABLE
1-2
OUTPUT EFFECTS, OFFSET VARIATIONS AND RIPPLE SPECIFICATIONS.
d)
OUTPUT RANGES:
(See
Table
1-1
for specific ratings of each model)
1)
VOLTAGE MODE: 0-100%
of
rated voltage.
2)
CURRENT MODE: 0-100%
of
rated current. Useable range limited to approximately 1%
to
100%. The maximum current is factory set to 105% of the rated output current.
e)
OPERATING TEMPERATURE RANGE:
o•c
to
65°C. No derating to
55•c,
derate 10%
of
listed max-
imum output current values in Table
1-1
for operation to
65
•c
ambient temperature.
f)
STORAGE TEMPERATURE RANGE:
(-
)40•c
to
85•C.
g)
COOLING: High efficiency, single bearing fans, permanently lubricated, with special
low-noise
non-metalic
blades.
ATE
A-E-1286A
1-3
h)
ISOLATION: A maximum of
500
volts
(d-e
or
p-p)
can
be
connected between chassis and either out·
put terminaL The common-mode current from eitheroutput terminal to ground is less than
5p,A
(rms)
or less than
50
p,A
(P·P)
at
115V
a-c
60
Hz.
i)
DYNAMIC SPECIFICATIONS
1)
VOLTAGE
RECOVERY
FOR
A STEP-LOAD CURRENT:
The time required for the stabilized output voltage
to
recover to within
10
mV
of
the output
voltage setting, for a
10
to
100% step in rated load current is typically less than
50p,sec.,
100p,sec.
maximum.
2)
CURRENT
RECOVERY
FOR
STEP-LOAD VOLTAGE:
The stabilized output current recovers from a step in load (compliance) voltage with
an
ex-
ponenUal
r~sponse,
the time constant of which is determined
by
the load resistance and the
tabulated
o~·
tput capacitance
(See
Table
1-1).
3)
PROGRAM
lNG
SPEED:
The speed ith which the power supply output responds
to
external programming signals is
determined
by:
1)
The
PRO~RAMMING
TIME CONSTANT (r), given in the
"slow"
mode
by
either the load
resistan~e
(RL)
and the value of the output capacitor
(C
0, see Table
1-1
):
r =
RL
C0, or by the
FEEIDBACK
TIME CONSTANT, given
by
the product of the feedback capacitor and the feed-
back resi1
stor: T =
Rt
Ct,
whichever is greater.
In
the
"fast"
mode, the PROGRAMMING TIME
CONSTANT and bandwidth (-3dB) for the Voltage Control Channel is shown in the table:
Programming
Output Bandwidth Time Constant
Voltage (-3dB)
KHz
(p,sec)
Ratings Typ. Min. Typ. Max.
6V
23.0
16.0
7.0
10.0
15V
20.0
10.6
8.0
15.0
25V
11.5
8.0
14.0
20.0
36V
8.0
6.4
20.0
25.0
55V
4.8 4.0
33.0
40.0
75V
4.3
3.5
37.0
45.0
100V
2.7 2.5
60.0 65.0
150V
1.8
1.7
88.0
95.0
325V
1.5
0.94
110.0 170.0
For the Current Control Channel, the PROGRAMMING TIME CONSTANT is
25p,sec.
typical,
50p,sec.
maximum.
(80p,sec.
for the
ATE
325-0.8M).
2)
The MA*IMUM
RATE
OF
CHANGE that the power supply output can respond
to
is given
by
the settilng of the power supply's current control setting
(ILIM),
divided by the
ATE
output
capacitor
(C
0, see Table
1·1):
MAXIMUM
RATE
OF
CHANGE =
ILIM/C
0•
k)
OVERVOLTAG~
CROWBAR SPECIFICATIONS:
1·4
1)
TRIGGERI~G
TIME: <50p,sec. slow mode, <500p,sec. fast mode.
2)
SETTING
~ANGE:
1.6%
or
3V
(whichever Is
greater)
minimum,
to
110% of the maximum rated
output
volt~ge
for each modeL
3)
THRESHO~D:
Minimum
0.5
volts, or 2% E0
max.•
whichever is greater.
4)
TEMPERAtURE COEFFICIENT: <0.02% of E0
max.
per "C.
ATE
A-E-20788
1·10 MISCELLANEOUS FEATURES
a)
CONTROL/PROGRAMMING
1)
VOLTAGE CHANNEL: Output voltage is controlled continuously throughout the range
by
a panel-
mounted, 10-turn rheostat. External control can
be
exercised by resistance or by a control voltage
{See
Section Ill).
2)
CURRENT CHANNEL {INTERNAL): Output current is controlled continuously throughout the range
by a panel-mounted, 10-turn potentiometer. External control can
be
exercised
by
resistance or by a
control voltage
{See
Section Ill). When controlling the external current channel, the power supply's
panel-mounted current control serves as an adjustable maximum current limit.
3)
CURRENT CHANNEL {EXTERNAL): Output current may
be
controlled by means of a separate current
channel, applying a 0 to
1V
d-e
control signal at the
REAR
PROGRAMMING CONNECTOR, for control
over the rated current range. This same channel, properly programmed, may control the output
of
the
power supply responding to control and feedback voltages from temperature or pressure sensors,
chemical reactions and the like
{See
Section Ill).
4)
OVERVOLTAGE PROTECTOR. The crowbar level may be controlled locally by the provided
CROWBAR LEVEL control at the front panel. Remote control of the crowbar level can
be
exercised by
connecting a
0-10
volt control source to the
REAR
PROGRAMMING CONNECTOR. Automatic track-
ing of the crowbar level
with
the output voltage level may
be
achieved by means of the simultaneous
connection of the voltage channel programming source to the tracking input.
b)
MODE FLAG: A pair
of
panel
LED
indicators operate
to
indicate whether the voltage channel or the
internally-sensed current channels have control
of
the output.
In
addition, an isolated flag signal is pro-
vided through an opto-isolator at the rear programming connector.
c)
REMOTE
ERROR
SENSING: Separate voltage-sensing terminals permit 4-wire connections to a load. Will
compensate for
static
load effects up to 0.5V per lead.
An
additional 1 Volt output voltage, beyond the
nominal voltage rating
of
each
ATE
model, is provided for this purpose.
d)
REFERENCE SUPPLIES: Two dual reference sources are available at the
REAR
PROGRAMMING CON-
NECTOR:
±6.2V
d-e@
1 mA and ± 15V
d-e@
10
mA.
e)
CURRENT SENSING AMPLIFIER: The output of the current sensing amplifier is available on the rear pro-
gramming connector. It provides a voltage analog
of
the output current. The range
of
the analog output is
0 to +
1V,
corresponding to output currents of 0 to 100% {respectively).
1-11
MECHANICAL SPECIFICATIONS
a)
Refer
to
the "Mechanical Outline Drawing", FIG. 1-2.
1-12 ACCESSORIES
1-13
ATE
power supplies are supplied
with
one Model PC-12 Programming Connector, mounted and wired for
front panel output control. Additional connectors are optional and may
be
ordered as MODEL
PC-12
{unwired).
ATE
models smaller than full-rack size can
be
rack mounted, using one of several Kepco Rack
Adapters:
NOTE:
ALL
KEPCO
RACK
ADAPTERS
FIT
STANDARD
EIA
RACK
DIMENSIONS.
THEY
ARE
DRILLED FOR
STANDARD
CHASSIS
SLIDES
AND
ARE
PROVIDED WITH
SLIDE
SUPPORT
BRACKETS.
a)
RACK ADAPTER, KEPCO MODEL
RA-24.
For all Kepco quarter-rack, half-rack and three quarter-rack
models, or a mixture of them. Filler panels
to
cover empty slots,
if
the adapter is not used to
its
full
capacity, are available.
b)
RACK ADAPTER, KEPCO MODEL
RA-32.
For {two) Kepco quarter-rack models or (one) half-rack model.
Has additional space for (three) one-sixth rack modular Kepco units. Filler panels to cover empty slots,
if
the adapter is not used to its full capacity, are available.
c)
RACK ADAPTER, KEPCO MODEL
RA-37.
For Kepco ATE models only. Accepts quarter-rack, half-rack or
three quarter-rack
ATE
models or a mixture
of
them. The model
RA-37
can
be
used
without
filler support
brackets when fully loaded.
ATE
A-E-04-1388
1-5/1-6
)>
...
m
..
I
"'
~
~
Cxl
OUTPUT
AND
SENSING
TERMINAL
FUNCTION
1
(-)
SENSIN'3
2
(-)OUTPUT
3 GROUND
4(+)
OUTPUT
5
(+l
SENSING
'r-
-----<
!
+(3.2)-
I I
I
I
I
I
s-lz-1132.6
!
I
I
_l_
.-----
I
0
KEPCO
POWER
SUPPLY
:
t]
I~:
"l
/I
, I
"Q
~"""'"""'"''""
""'""
..
'
,,~,.
·;
"'~"
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o
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u
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©
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'r·t{'3,5lTYP
i-----1
:--kl7.1)
I '
9 I
432(108.71
l
--+
,=-:::2',
'I
hl_
L
..j'
r
/
PROGRAMMING_)
CONNECTOR
w l
L_j
~
"~+(15.9)
I
~1-fu-139.7)---1
"~Ac
INPUT
SOURCE
RECEPTACLE
I--
3-lz
(83.3)
-·-------1
$WITCHCRAFT
EAC
302.
REAR
VIEW
oo-·
D
I
D
DO_
D
D
VENTILATED
AREA
Io
ZERO·
I
PREAMPAZERO
\ I
/loMAX
I'
eRE
AMP
B ZERO
--\
\
1
,'/
/Eo
ZERO
,
---·-
~~EoCAG
D
curourft-xi~~
(7.9))((35.7)
~·:::1:.
.DD
~
-~
---
--l-
--
17+(435.0)----
DO
D
I
I
i
D
oo_-·-·
L+l64l
VENTILATED
AREA
TYPICAL
FOR
80TH
SIDES
-G-·
D
D
D
D
D
-
_
_o
__
_
I ,
DO
9
©\
~
!
~~
_oB
j I 0
~--~
r----
l-i-(159)
____.
TERMINAL
COVER
FIG.
1-2
MECHANICAL
OUTLINE DRAWING
I
4-&-(105.2)
I.
THIS DRAWING
IS
USED
FOR
THE FOLLOWING MODELS
ATE6
-5M,
ATE6-IOM,
ATE
15-3M,
ATE
15-6M,
ATE25-2M
ATE25-4M,
ATE36-1.5rtl,
ATE
36-3M,
ATE.55-IM,ATE55-2M
ATE75-0.7M,
A
TE75-1.5M,
ATE
100-0.5
M,
ATE
100-lt.i.
2
MATERIAL
A-CHASSI<:;:
N0-16
GA.
C.R.S
8-FRONT
PANEL:
1/8 THICK ALUMINUM.
C-COVER
N0.20
GA
C.R
S.
3.
FINISH
A-CHASSIS" CADMIUM
PL.
ATE
WiTH
CHROMATE
WASI-L
8-FRONT
PtlNEL:
LIGHT
'3RAY PER
FEDERAL
STD.595,
COLOR
NO,
26440.
C-COVER:
CHARCOAL GRAY VINYL.
TI:.XfURE
4.
RACK MOUNT lNG. 'lEMOVE
(4)
FEET
FROM BOTTOM
OF
CHASSIS.
5.-{4)PLASTIC
MOUNTING
INSERT
UNDE"!
FEET,
FOR
8-1Sx518
SELF-THREADING
SCREWS(
WITH
l/8
THICK
MOUNTING
PLATE).
6 DIMENSIONS
IN
PARENT11ESIS ARE lN
MILU~~ETERS
7
TOLERANCES
A-BETWEEN
MOUNTING
HOLES±
1164(±0
4)
B-ALL
FRONT PANEL DIMENSIONS
TO
MIL-STD-189.
C-ALL
OTHER
DIMENSIONS±
1/32(±0
B), E.XCEPT
AS
NOTED.
SECTION
II-
INSTALLATION
2-1
UNPACKING AND INSPECTION
2-2 This instrument
has
been
thoroughly
inspected and tested
prior
to
packing and
is
ready
for
operation.
After
careful unpacking, inspect
tor
shipping damage before
attempting
to
operate. Perform the
preliminary
opera-
tional
check
as
outlined in paragraph 2-8 below.
If
any indication
of
damage
is
found,
file
an
immediate claim
with
the responsible transport service.
2-3 TERMINATIONS
a)
FRONT
PANEL
Refer
tc
FIG. 2-2 and Table 2-2.
b) REAR
RefertoFIG.2-3andTable2-3.
c)
INTERNAL
CONTROLS
Refer
to
FIG.
2-1
and Table 2-1.
REFERENCE
DESIGNATION
R17
R24
R32
R39
R62
R63
AT!~=:
l/4-2078
CONTROL PURPOSE
10
MAX
Maximum
Output
Current
E0 LAG Voltage Channel
Stabilty
Control
E0
ZERO
Voltage Channel Zero
Control
10 ZERO Current Channel Zero
Control
PREAMP
"B"
ZERO
Offset Zero
Control
for
PREAMP
"B"
PREAMP
"A"
ZERO
Offset Zero
Control
tor
PREAMP
"A"
TABLE
2-1
INTERNAL
CONTROLS
AND
THEIR
FUNCTIONS
.
...------R62
PREAMP.
"s"
ZERO
.....-----R63
PREAMP.
"A"
ZERO
.------R39
Io
ZERO
FIG.
2-1
LOCATION
OF
INTERNAL
CONTROLS,
ATE
1/4
RACK
GROUP.
2-1
NO.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
2-2
0
KEPCO
POWER
SUPPLY
0 0
~
0-
0-
ON
0-
OFF
fiG.
2-2
CONTROLS
AND
TERMINATIONS,
ATE
1/4
RACK
GROUP,
FRONT.
i
CONTR~L
OR
TERMINATION
FUNCTION
VOL
TACiJE
CONTROL
ADJUSTS
OUTPUT
VOLTAGE
FROM
ZERO
TO
E0 max.
A-C POWER
SWITCH/
SERVES AS A-C POWER SWITCH
AND
TURNS
A-C POWER
CIRCUit
BREAKER
LINE
"OFF"
ON
OVERLOAD
"V"
MOPE
INDICATOR
ENERGIZES
IN
VOLTAGE
MODE
VOLTM~TER
MONITORS
OUTPUT
VOLTAGE
O-E
0 max.
AMMET
R
MONITORS
OUTPUT
CURRENT
0-10 max.
"I"
MODE
INDICATOR
ENERGIZES
IN
CURRENT
MODE
"LEVEU"
CONTROL
ADJUSTS
TRIGGER
LEVEL
OF CROWBAR
CIRCUIT
CROWBAR
INDICATOR
LIGHTS
WHEN CROWBAR
IS
TRIGGERED
"ON"
"DISARM"
PUSH-BUTTON PUSH TO SET CROWBAR
TRIGGER
LEVEL
CURRENT
CONTROL
ADJUSTS
CURRENT
FROM
0-100% 10 max.
TABLE
2-2
CONTROLS
AND
TERMINATIONS,
ATE
1/4
RACK
GROUP,
FRONT.
ATE
1/4-2078
NO.
1.
2.
3.
ATE
1/4-2078
2
50
0
49
0
o---
'
I
I
D
I
l
I
D I
0o
__
D
~D@
ATE
(REAR VIEW)
FIG.
2-3
TERMINATIONS,
ATE
1/4
RACK
GROUP,
REAR.
TERMINATION
FUNCTION
REAR
MATING
CONNECTOR
(PC-12) FOR
EXTERNAL
PROGRAMMING
SOURCE
INPUT
AND
ALL
OTHER
PROGRAMMING
FUNCTIONS.
OUTPUT
TERMINALS,
TB201 1)
(-)
SENSING
2) (-) D-C
OUTPUT
3)
GROUND
(CHASSIS
CONNECTION)
4)
(+) D-C
OUTPUT
5)
(+)SENSING
A-C POWER
INPUT
ACCEPTS 3-WIRE A-C
INPUT
CORD
(SUPPLIED)
TABLE
2-3
REAR
TERMINATIONS,
ATE
1/4
RACK
GROUP,
WITH
PROGRAMMABLE
VP,
REAR.
2-3
2-4
A-C
INPUT REQUIREMENTS
2-5 This power supply
is
normally
supplied
for
operation
on a single phase,
nominal
115V
a-cline.
For
conversion
to
other
a-c
source voltages, refer
to
FIG.
2-4. Select
your
nominal
source voltage and change the
links
on the
barrier
strip
of
T201 according
to
the table provided in
FIG.
2-4. The
circuit
breaker (CB101) remains
equally
effective at all
input
voltages.
T201
AC
CONNECT
SOURCE
LINKS
104V
3)-
(4) 1(7)
-(8)
115 v
~4)-(5)1(6)-(7)
208V
(2)-(3)
I
(8)-(9)
230V
(5)-(6)
---•FRONT
ATE
-1/4
RACK
1
SIDE
VIEW
1
COVER
REMOVED
FIG.
2-4 A-C
INPUT
SOURCE
VOLTAGE
SELECTION,
ATE
1/4
RACK
GROUP.
2-6
COOLING
2-7 The power transistors and rectifiers in the
ATE
power
supplies are maintained
within
their
operating tempera-
ture
range
by
teans
ot
special heat sink assemblies, cooled
by
internal fans. SIDE
PANEL
OPENINGS
AND
THE
TOP OF tTHE CASE
MUST
BE
KEPT
CLEAR
FROM
OBSTRUCTIONS
TO
INSURE
PROPER
AIR
CIRCULATION.
Periodic cleaning
of
the
interior
of
the power supply
is
recommended.
If
the
power
supply
is
rack rnounteq, or installed
into
confined
spaces, care must
be
taken
that
the
ambient
temperature
(the tem-
perature
imme~iately
surrounding the power supply) does
not
rise above the
limit
specified (refer
to
Section
1).
2-8
PRELIMINARY
CHECK-OUT
2-9 A simple operating check
after
unpacking and before permanent
installation
is
advisable
to
ascertain
whether
the power supply
has
suffered damage resulting trorn shipment. Refer
to
FIG.
2-2 and
to
FIG.
2-3
for
the
2-4
location
of
the operatinq
controls
and
output
terminals.
a)
Connect
~ower
supply
to
115V
a-c
source
or
refer
to
par. 2-4
for
other
input
voltages,
if
required.
b)
Turn
C~RRENT
CONTROL
tully
clockwise.
Turn
VOLTAGE
CONTROL
fully
counterclockwise.
c)
Turn
A-q
POWER
SWITCH/CIRCUIT
BREAKER
"on".
The
VOLTAGE
VIX
indicator
should
be
ener-
gi;ed.
SltJwly
turn
VOLTAGE
CONTROL
clockwise and observe the gradual increase
of
the
output
voltage. The
VOLTMETER
should
now
read
full
scale.
d) Check the overvoltage
"crowbar"
circuit
as
follows.
1)
Turn
the
VOLTAGE
CONT
R0 L
to
about
one-half
of
its range.
2)
Der1ress
the
DISARM
push
button
and
turn
the (recessed)
LEVEL
control
slowly
counterclockwise
until
the
CROWBAR
INDICATOR
larnr
lights up.
3)
Turn
VOLTAGE
CONTROL
slightly
counterclockwise
and release
DISARM
button.
4)
To
reset the adjusted crowbar
point,
press
DISARM
button
again and advance
VOLTAGE
CON-
TROL
clockwise.
Note
voltage at
which
the
CROWBAR
INDICATOR
lights up. Readjust
LEVEL
control
if
necessary,
by
repeating
ster
(2) and check
21gain
by
repeating steps (3) and (4).
!J)
Turn
A-C POWER
SWITCH/CIRCUIT
BREAKER
"off".
e)
Place a short
circuit
across the
ATE
output
terminals.
Turn
CURRENT
CONTROL
counterclockwise.
Turn
the
ATE
"on".
THE
CURRENT
MODE
indicator
should
now
be energized.
Slowly
turn
CURRENT
CONTROL
clockwise and observe the
grad11al
increase in
output
current.
The
AMMETER
should
now
read
lui
II
scale.
ATE
1/4·2078
2-10
INSTALLATION
(Refer to FIG. 1-3 "Mechanical Outline Drawing")
2-11 The Power
Supply
may be rack-mounted
or
operated
as
a
"bench-type"
instrument.
If
the
ATE
is
to
rack-
mounted,
the (4)
bottom
feet must
be
removed.
2-12
For
all installations
into
confined spaces, care must be taken that the temperature
immediately
surrounding the
unit
does
not
exceed the rnaxirnum specified
ambient
temperature
(65°C).
2-13
GROUNDING
a)
A-C
(SAFETY)
GROUND.
The
power
supply
is
equipped
with
a 3-wire safety line cord and polari?ed
plug. The
third
(green)
wire
in the line cord
is
connected
to
the chassis and the
case
of
the
unit.
If
a
2-terrninal
rf~ceptacle
in
combination
with
an
adapter
is
used,
it
is
imperative
that
the chassis
of
the power
supply
be
returned
to
a-c
ground
with
a separate lead. A
grounding
terminal
is
provided (at the rear barrier
strip)
for
this purpose.
b) I
SO
LA
Tl
0 N
FROM
GROUND.
The d-e
output
is
isolated
from
the
a-c
source and
from
any
direct con-
nection
to
chassis
or
ground.
Thf~
rnaxirnurn
output
voltaqe that
can
b(]
supported between either
output
terminals and ground
or
chassis
is
500V
(d-e
or
peak), plus the maxirnurn
output
voltage
of
the power
supply. Either side
of
the
output
r11ay
be
qrounded.
ATE
1/4·2078
A resistor/capacitor network
(R59,
C27),
is
connected from the negative output terminal to the metal
chassis
of the power supply
(via
OD-1).
If
the
internal
signal
ground
is
not
desired, the connection to the
chassis
can
be
opened by
changing
the wire
lug
position from OD-1 to QC-2
(See
FIG.
2-5).
0!)
QD2
ATE-
1/4
RACK
CONTROL ASS'Y.
(P.C. BOARD)
FIG.
2-5
LOCATION
OF
INTERNAL
SIGNAL
GROUND.
SIGNAL
GROUND
NETWORK
SH
WN
CONNECTED
VIA
QD-1.
TO
REMOVE
SIGNAL
GROUND,
PLACE
WIRE
LUG
ONTO
QD
2.
2-5
2-6
2-14 FAST MODE CONVERSION OF THE ATE POWER SUPPLY
2-15 Power supplies designed to operate
in
a voltage, as well as
in
a current stabilizing mode, often represent 2 com-
promise between the conflicting requirements of a good voltage and a good current source. A good voltage
source must have
/ow
output impedance, good output voltage stability and good dynam1c stability
in
the
presence of loads with capacitive and/or inductive
content
The oower supply achieves these design goals by
relying to a great extent upon a large output capacitor having a very low terminal impedance. large energy stor-
ing ability and great resistance to rapid voltage changes. Unfortunately. the requirements for a good current
source are quite opposite to that of the voltage source described above. A current source should
r1ave
high
out-
put impedance and its terminal voltage must be able to assume rapidly any value as may be needed to keep the
output current at the predetermined level. while the load
is
changing
2-16
To
satisfy these conflicting requirements. the
ATE
power supply was designed for quick manual change-over
from the
"slow"
mode to the
"fast"
mode of operation.
In
the
"slow"
mode. the
ATE
power supply approaches
an ideal voltage source Heavy output and feedback capacitors provide for low output noise. excellent voltage
stability
art1d
good transient response.
In
tile
"fast"
mode, the output and main feedback capacitors are com-
pletely removed, thereby providing the charactenstics of a wide-band amplifier, ideal for applications requiring
a current stabilizer or for high speed voltage or current programming.
2-17 MANUAL CHANGE-OVER, SLOW/FAST MODE.The
ATE
power supply
is
normally delivered for operation
1n
the
"slow"
mode.
By
changing jumper connections
at
the rear of the power supply, the user can quickly convert
from the
"slow"
mode to the
"fast''
mode or vice versa (See FIG. 2-6).
PC-IZ
-S
-OUT
GRD.
-i-OUT
+S
l®I§M¢11JI®F~~
STEP i
STEP 3
STEP 5 1
ODD
STEP Z
....
ooo
~w~
ATE
1/4
R
CK
FIG.
2-6
REQUIRED
STEPS
FOR
ATE
"FA$T MODE" CONVERSION
STEP
1:
STEP
2:
STEP
3:
STEP
4:
STEP
5:
TO
ACINPUT
SOURCE
(}
Remove
Links
(19)-(20) and
(43)-(45)
on
PC-12.
This removes
the output capacitor
(C
0
).
Remove
jumper
(45)-(47)
on
PC-12.
This removes the main feedback
capacitor
(C
1).
Connect wire jumper
on
PC-12
from
(26)
to
(27).
This connects a
lag network_
Refer to Section
II,
FIG
2-5
and
remove the internal grounding
network.
Connect wire jumper from
(39)
to
(48)
on
PC-12.
This introduces are-
quired delay
in
the crowbar circuit.
NOTE: For
fast
mode
operation
into
a
load
interrupted
by
contac-
tors
or
relays
("Arcing
Load"), a small, high-frequency-type
capacitor
may
be required
across
the
contacts
of
the
interrupting
device,
or
the
power
supply
output
terminals,
or
directly
across
the
load
terminals. A
ceramic
disc
capacitor
(0.01
1
,F) has been
found
to be
adequate
to prevent
spurious
triggering
of
the overvoltage
circuit.
2-18 PRECAUtiONS. The output capacitor, and to a lesser extent. the feedback capacitor of a power supply, control
the programming speed and the current mode recovery time. The removal of these capacitors
in
the fast mode
results
irl
greatly improved power supply performance
in
these areas. The power supply's dynamic stability,
however,
is
reduced, making the output sensitive to the load phase angle. For this reason. the load presented to
the
powEjr
supply
in
the fast mode must not contain excessive capacitance
(limit
1
OOOpF).
Also, with the output
and
mai~
feedback capacitors removed, there will be an increase
in
the output noise, mainly high frequency
noise and pick-up,
so
that external shielding of programming leads and good grounding practices assume
ad-
ded importance
in
the fast mode operation. See also note
in
FIG. 2-6.
2-19 LAG NETWORK ADJUSTMENT The
ATE
power supply operating
in
the
"fast"
mode.
is
dynamically stabilized
by means of an internal lag network
(E
0 LAG, R24 see FIG.
2-1
for !ocation). This control should be adjusted, for
each application, by monitoring the load with an oscilloscope and turning tne
LAG
control for best output
respons$ and maximum dynamic stability under all operating conditions
2-20
CROWB~R
OPERATION, FAST MODE. The crowbar circuit
in
the
ATE
power supply
is
not completely removed
in
the
"ffst"
operating mode, but continues to offer protection against
d-e
voltage surges which may harm the
load !
ATE
'/,-2078A
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1
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