KEPCO АТЕ User Manual

KEPCO®

THE PO W ER SUPPLI ER ™

INSTRUCTION MANUAL

ATE 1/4 RACK

POWER SUPPLY

AUTOMATIC TEST EQUIPMENT

KEPCO INC.

An ISO 9001 Company.

ATE 1/4 RACK

POWER SUPPLY

ORDER NO. REV. NO.

NOTE This on-line version of the Technical

IMPORTANT NOTES:

1) This manual is valid for the following Model and associated serial numbers:

Manual includes only installation and
operating instructions. For the complete

MODEL SERIAL NO. REV. NO.

ATE 100-0.5M F19688 9

MODEL

manual, please contact Kepco.

2) A Change Page may be included at the end of the m anual. 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 t he Kepco Docu-
mentation Office in New York, [phone], requesting the correct revision for your par-
ticular model and serial number.

3) The contents of this manual are protected by copyright. Reproduc tion of any part can be
made only with the specific written permission of Kepco, Inc.

Data subject to change without notice.

©1999, KEPCO, INC.

KEPCO, INC.

! 131-38 SANFORD AVENUE ! FLUSHING, NY. 1 1352 U.S.A. ! TEL [phone] ! FAX [phone]

email: [e-mail] ! World Wide Web: http://www.kepcopower.com

Declaration

of

Conformity

Application

Standard to which Conformity is

EN61

of

Council directives:

declared:

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:

Model No.:

73/23/EEC
93/68/EEC

Component

(LVD)
(CE

mark)

Power

Supply

[PRODUCT MODEL NUMBER]

Year

of

Manufacture:

I,

the undersigned, declare that the product specified above, when used
tions of conformance set forth
Low Voltage Directive 73/23/EEC, which forms the basis for

Place:

Date:------

228-1348 DC-COMP/INST 062399

KEPCO Inc.
131-38 Sanford Ave.
Flushing, N.Y.11352

in

conjunction with the condi-

in

the product instruction manual, complies with the requirements

application of the CE Mark to this product.

USA

Saul Kupferberg

(Full Name)

VP

OF

SALES

(position)

of

the

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 Low Voltage Directive, 73/23/EEC, this power
supply is considered a component product, designed for
plete

in

construction, the end product enclosure must provide for compliance to any remaining electri-

cal safety requirements and act as a fire enclosure.

"built in" applications. Because it

(EN61010-1 Cl. 6, Cl.

7,

CI.B,

is

Cl. 9 and EN61010-

1 annex F)

2. This power
power

3.

This power supply is considered a Class 1 (earthed) product, and as such depends upon proper con­nection to protective earth for safety from electric shock. (EN61

4.

This power supply is intended for use as part

supply is designed for stationary installation, with mains power applied via a detachable

supply cord or via direct wiring to the source power terminal block.

010-1 Cl. 6.5.4)

of

equipment meant for test, measurement and labora­tory 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 con­nection. 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

6. The output wiring terminals

of

2V

or more.

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.

incom-

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 power supply itself from damage in the event
fault condition. For complete circuit protection of the end product, as
required that a primary circuit protection device be fitted to the branch circuit wiring. (EN61

well as the building wiring, it

01

9.6.2)

8.

Hazardous voltages are present within this power supply during normal operation. All operator adjust­ments to

the prcilduct are made via externally accessible switches, controls and signal lines as speci­fied 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.

0-1

of

Cl.

a

is

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:

There are no operator seJViceable parts or adjustments within the product enclosure.
Refer all seJVicing to trained

seJVice

technician.

Source power must be removed from the product prior to 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

2.

Grounding

panel.
herein, the product must be modified

To

reconfigure the product input for other nominal mains voltages as listed

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 con­nected prior to application

of

source power to the product (see instructions

lation herein) in order to ensure safety from electric shock.
PROTECTIVE EARTHING CONDUCTOR

point

on

the product to which the protective earthing conductor must be attached.

TERMINAL-

This symbol indicates the

EARTH (GROUND) TERMINAL - This symbol is used to indicate a point which is
connected to the
assembler

PROTECTIVE EARTHING TERMINAL. The component installer/

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
grounding herein). This is not to
may not

be

used

of

convenience for performance purposes (see instructions

be

confused with the protective earthing point, and

in

place

of

it.

on

instal-

on

3.

Electric Shock Hazards

This product outputs hazardous voltage and energy levels as a function

in

must be trained

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

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

tions.

228-1352

SAFETY-

(COVER REMOVAL) 062399

of

normal operation. Operators

of

normal

of

or

single fault condi-

normal or single fault condi-

C/(0

BLANK)

TABLE OF CONTENTS

PARAGRAPH

SECTION I - INSTRUCTION

Scope

of

1-1

1-3 General

Manual

Description....

1-9 Specifications,
1

-10 Miscellaneous Featrues

1-11

1-12

Mechanical

Accessories

SECTION

2-1
2-3
24
2-6
2-8
2-10
2-13
2-14

Unpacking
Terminations

A-C

Input

Cooling . .
Preliminary

Installation

Grounding

Fast Mode Conversion

SECTION

3-1
3-3
3-6
3-12

3-16
3-19
3-21
3-24
3-27

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

Gener·al
Safety
D-C
Power

Load
Load
Load

Load Connections,
Standard
Standard
Overvoltage

Introduction

Programming the Voltage Control Channel .

Output

Voltage

Voltage

Programming the Current Control Channel .

Output

Output

Programming the Overvoltage Protector. . . . . . . . . . . . . . . . . . . .

R8rnote
[xwrnal

Automatic

Programming Output Voltage

The
for
Multirle
Sc:ries

Parallf~l

Prowarnming
Application

....

Grounding

Output

Supply/Load

Connection,
Connection,
Connection,

Control

Control
Control

Current
Current

Crowbar

USE-1

uf

GenNal Feedback

Operation

Operation

......

Electrical.

Specifications

........................................................

II-

INSTALLATION

and Inspection

Reljurrcrnents

Check-Out.

..

..........................................................

of

Ill-

OPERATION

Grounding

Interface

General. . . .

Method

Method

Method
Voltage
Current

Mode
Mode

Crowbar,

to Remote

Setup and Check

..............................................

.

.

...........................................

. . .

................................................

..............................................

................................................

...................................................

.................................................

the

...

I (Local
II

Ill
Operation
Operation

Control

..........................................

.......................................

............................................

.

ATE

Power

Supply

Error

Sensing)

(Remote

. . . . . . . . . . . . . . . . . . .

Error

(Front

Panel

(Front

Panel

........................................

of

the

ATE

.....................................

with

an

External
with a Two-Terminal
with

a High Impedance

0-10

Volt

Resistance

Control

.....................................

Control
Control

0--10

Volt

(Trackir1g)

the

"EXT.

Pow8r

Supply

With

Df Isolated Flag Signals

with

with a Two-Terminal

Level

Control

D-C 1

mA

Control

CURRENT

Control

and Systems

of

ATE

Power

of

ATE

Power Supplies

Reference

an

External

with

Signal

of

the

and

..............................................

Supplies.

to

the

Control

an

...................................

Crowbar

Output Current Simultaneously

COMPARISON

Operation

......................................

NEGATIVE

.

...............................

..................................

................................

..............................

.................................

Sensing)

Output

D-C

...............................

Control)
Control)

Control

..................................

Source

Resistance

Level

...................................

Power

............................

...............................

Signal

.............................

Signal

.............................

............................

...............................

AMPLIFIER"

. . . . . . . . . . . . .

Supply

...................

.

...............

......................

........................

......................

Output

....

.................

............

..............

..............

..............

.............

:

.....

PAGE

1-1

1-1

1-2
1-5/1-6
1-5/1-6
1-5/1-6

.2-1

2-1

.2-4
.2-4
.2-4
.2-5
.2-5

2-6

3-1

3-1
3-1
3-2
3-3
3-4
3-4
3-5
3-5

3-6
3-6

3-7
3-7
3-7
3-8

3-10
3-12
3-12
3-13
3-15

3-15
3-16
3-17

3-19
3-20
3-21
3-25

3-32
3-34

ATE

1/4---2078

i-

PARAGRAPH

SECTION

IV-

THEORY

PAGE

OF OPERATION

4-1
4-12
4-19

51

5-3

5-4

5-9

5-13

6-1
6-3

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

3-10
3-11

3-12

3-13

3-14
315

3-16
317

Simplified

Simplified
Circuit

Diagram Discussion (General
Diagram Discussion (Overvoltage Protector

Description,

Based

on Main Schematic Diagram

Circuitry).

Circuit)

......

.........

.

SECTION V-MAINTENANCE

Gener~l

Disasspmbly

lnter~al

Trou~le

Powe1

SECT~ON

Gener~l

Ordering

. . . . . . . . . .

..........................................................

Adjustment
Shooting

Supply

i

VI

. . . . .

Information.

Procedures

......................................................

Measurements

-PARTS

LIST

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

.............................................

...............................................

AND

DIAGRAMS

............................................

.....................................

LIST OF ILLUSTRATIONS

Kepccj

ATE

Power Supplies. . . .

Mech~nical

Location
Contrpls and
Termirations
A-C

Location

Required Steps
Typical

Standrrd

Load K=onnection,

Load

~~J~~~o~~~~::~;~·o~~r~

(0-1

Two-ferminal

UsingiPREAMP

Conn~ctions

UsingiPREAMP

Contrbl

Conn~ctions

Conn~ctions

0-1

Two-terminal

UsingiPREAMP

Corm4ctions

Two-terminal

Remo~"

Conn~ctions

the

O~Jtput

Conndctions

lllurnilnation

Outline

'

of

Internal

Terminations

(Rear)

l~put

Source Selection

of

the Internal Signal

Output

Jumper

Connection,

d

Volt, 1 mA)

for

Potential

for
tor

\folt

Control

for

Crowbar Level

tor

Voltage and the

for
Control

Drawing

Controls

....

for

"Slow

Impedance

Link

Method
Method

DC

Resistance Proqrarnrning

"A"

and the Internal Reference Source

Voltage

"A"

to

from

Voltage
Output

Signal (Kepco

Resistance Programming

"B"

and the Internal Reference Source

Output

Resistance

Simultaneously Programming

Simultaneous

Circuit

............................................

(Front)

................................................

Mode/Fast

Curve.

Connections . . . . . . . . . . . . . . . .

I.

. . . . . . . . . . . . . . . . . . . . . .

II . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1

1°~

~~~

a.n.

Control

Control

Generate the

a High Impedance Source

Control

Current

Ctment

..

Control

Crowbar

With

........................................

...............

.............

Ground

With

Control

........................................

Mode"

Conversion

. . . . . . . . . . . . . . . . . . . . . . . .

~

x·t~rn~

I

.......................................

Srgnal . . . . . .

of

the Voltage Channel

With a Two-Terminals

0-10

Volt@

With

a High Impedance lnpu t Source
Control
SN

Control

With

Programmer)

of

the

With

an

External Signal

Level

of

the

the

ATE

(Automatic

Power

1 rnA

..

a

........

Current

a

Output

Supply

.

.

.

.............................

......

........

Resistance

Channel

.............................

Source.

Tracking)...

Voltage/Output

.......................

.

.

. .

............................

.

..

......

Current

.

.............

............

............

.............

.

..............

...................

.

............

.

..............

.........

.......

..........

..........

.

.....

.....

......

.

.....

.4-1
.4-3
.4-4

5-1
5-1

5-2
5-2

5-3

6-1/6-2
6-1/6-2

PAGE

v/vi

1-7/1-8

2-1
2-2
2-3
2-4

2-5

2-6
3-2

3-3

3-4
3-4

3-5

3-8

3-8
3-9

.

..

3-10

3-11

. .3-12

3-13

3-14

.

..

3-15

. .3-16

3-17

3-19

-

ii-

ATE

1/4-2078

LIST OF ILLUSTRATIONS (cont'd.)

FIGURE

3-18

3-20
3-21

3-22 Master

3-23

3-24

Connections for

CURRENT

EXT.
Multiple

Power Supply Fault Detection Loop
Automatic
Developing the Drive for Master/Slave Series Connection,
ATE

Power Supplies

Slave

With

> 6

Developing the Driver

Volt

for 6
"Automatic"

3-25 Connections
3-27 Location
3-28 Redundant
3-29 Programming With Reference
3-30 Connections

NEGATIVE

3-31
4-1

Isolated Flag Signal Outputs

Crossover Characteristics,

4-2 Voltage Comparison Equivalent

Illumination

COMPARISON

Series

Connections

With

More Than 6

Series Connection,

Volt

Output

ATE

for

Supplies

Voltage

Master /Slave Series Connection,

..................................................

Parallel Operation,

for

Automatic

of

the Overvoltage Sensing

Parallel Operation

Parallel Connection

for

Programming

Output

of

the

ATE.....

ATE

Control,

AMPLIF-IER.

..............................................

ATE

.............................................

Output

.............................................

to

the

With

...............................................

Power Supply

Circuit

4-3 Current Comparison Equivalent Circuit

of

4-4 Generation

ATE

Voltage

4-5 Generation

ATE

4-6
4-7

Simplified Schematic Diagram, General
Programmable Overvoltage Protector and Crowbar Circuit,
Simplified

5-1

Disassembly

5-2 Test Set-up Diagrams
6-1

Component Location, Main
and Heat Sink Assembly

6-2 Component Location,
6-3 Main Schematic Diagram

the Internal Control Signal

and

Current Channels

of

the Internal Crowbar Level Signal

Schematic Diagram

of

the

ATE

for

...........................................

Power Supply

Output

Effect

Chassis

..............................................

Control Assembly

..............................................

Using the

.

..........................

.

.

..........................

Volt

.......

Output

Voltage

Power Supplies

Graph

...................................

...................................

Lead

Disconnect

NEGATIVE

Reference

.

....................................

to

..............................

Output

of

the

the

...................................

. .

....................................

.......................................

for

the

..........................................

.................................

Circuitry

...........................

........................................

Measurements

Assembly With

...........................

Front

Panel

...................................

........................

ATE

....................

PAGE

3-20
3-21
3-22

3-23

3-24

3-25
3-26
3-27
3-30
3-31
3-32

3-33
3-34

.4-1
.4-1
.4-2

.4-2
.4-3

4-7/4-8

4-9/4-10

5-1

5-5/5-6

6-17/6-18
6-19/6-20
6-21/6-22

ATE

TABLE

1-1
1-2

2-1
2-2
2-3

l/4-2078

LIST OF TABLES

D-C

Output

Output
Internal Controls and Their Functions

Controls and Terminations,
Rear

Ratings,

ATE

Power Supplies

Effects, Offset Variations and Ripple Specifications

Front

Panel.

Terminations

......................................................

......................................

..........................

.........................................

......................................

iii/iv-

-

PAGE

1-2
1-3

2-1

.2-2

2-3

ATE

A-E-2078

FIG.

(From

1-1

Top:

KEPCO

Size A,

ATE

B;

-

v/vi-

POWER

Size C;

SUPPLIES.

SizeD;

Size E).

1-1

SCOPE

1-2 This manual contains

and

1-3

GENERAL

1-4 The Kepco

deliver
indicators
of
control
stantly
pass

programmable.

chassis. Terminals are
tor

OF

MANUAL

current

stabiliLed d-e power supplies,

DESCRIPTION

ATE

with

either

stabilized

at the

front

a flag signal, available at the rear

by

means

of 1 0-turn,

monitor

transistor section driven

directly

at

All

the

the

load.

SECTION I - INTRODUCTION

instructions

programmable overvoltage

output

panel. Operating mode crossover

output

necessary

also provided

for

the

installation,

voltage or

programming

high

resolution

voltage and

by

input

output

high-gain, integrated

terminals are provided on a

for

remote

manufactured

current.

front

current.

error

operation

by

protector

The prevailing operating rnode

connector.

panel

This

circuit

sensing,

and maintenance

Kepco, Inc., Flushing, New

is

a precision stabilized

is

automatic

potentiometers.

power

amplifiers. The

as

and may

The

power

supply

programming

well

as

be

supply features

A pair

has

a linear and

output

for

the

of

the

"ATE"

York,

power

is

indicated

monitored

of

front

of

the

connector

connection

series

of

U.S.A.

supply

which

by

LED

remotely

"full

panel meters con­fully
power

at the rear

of

the

by

range"

dissipative NPN

supply

output

voltage

can

mode

means

output

is

fully

of

the

capaci-

1-5 The

recommended
voltage must change
current

1-6 The

power

1-7

An

overvoltage
feature. The trigger
tions

ATE

1-8

ATE

power

stabilizer,

ATE

power supply

supply

by

the

power

supply features user-selectable

for

applications

rapidly,

as

a reaction

demanding a constant voltage source. Fast mode

either in response

to

changing load resistaf1ce.

is

delivered for "slow mode" operation.

to "fast mode" operation.

protection

point

front

panel accessible setup

supplies are

SIZE

l'A"

''B"
''C"
''D"
''E''

circuit,

of

the overvoltage

built

in several mechanical

QUARTER-RACK
QUARTER-RACK

HALF-RACK

THREE-QUARTER

FULL-RACK

continuously

protector

controls

PACKAGE

MODELS

MODELS

"slow"

to

(refer

or

"fast"

operating modes. Slow mode operation

an

external programming signal or,

See

Section

adjustable

sizes

may

to

Section II
according

be

as

well

as

set

(or

checked) under actual operating condi-

of

this

to

their

MODELS

MODELS

RACK MODELS

operation

if

the

II,

par. 2-4 for converting

remotely

manual).

programmable,

approximate

APPROX.OUTPUTPOWER

50

100

output

WATT

WATT
250WATT
500

WATT

1000WATT

is

best

ATE

power

if

the

output

is

used

the

ATE

is a built-in

ratings:

as

is

a

Power transistors and drivers on all

blies

which

are cooled

from

ATE

A-E-2078

are constructed

Outline

Drawing",

by

cold-rolled

FIG.

1-2).

ATE

designs are

low-noise fans. The

ste\1.

The

ATE

front

mounted

main chassis assemblies,

panels

are

onto

made

highly

from

efficient,

as

well

aluminum

patented heat sink assem-

as

the wrap-around covers,

(refer

to

the "Mechanical

1-1

1-9 SPECIFICATION, ELECTRICAL

a)

AC INPUT SOURCE

95

to

113V

to

125V

105

to

226V

190

to

250V

210

b) DC OUTPUT

Size

"A"

Quarter-

d·c

OUTPUT

MODEL

ATE

6-5M
ATE 15-3M
ATE 25-2M
ATE 36-1.5M
ATE 55-1M
ATE 75-0.7M
ATE 100-0.5M 0-100 0-0.5 4
ATE

150-0.3M 0-150 0-0.3

Size

"B"

MODEL

ATE

6-10M
ATE 15-6M
ATE 25-4M
ATE 36-3M

ATE 55-2M
ATE 75-1.5M
ATE 100-1M 0-100 0-1 2
ATE 150-0.7M 0-150 0-0.7

RANGE

VOLTS

0-5

0-6

0-3

0-15
0-25

0-2

0-36

0-1.5
0-1

0-55

0-0.7 2.15

0-75

Quarter-

d·c

OUTPUT

RANGE

VOLTS

0-6

0-10

0-15

0-6
0-4

0-25

0-3

0-36
0-55

0-2

0-75

0-1.5 1

AMPS

AMPS

a-c

o}

a-c

or
a-cor
a-c

RATINGS

R~ck

R;:tck

Models

OUTPUT

IMPEDANCE

SERIES SERIES

RESISTANCE

24

1'0

100

1'0

!150

1'0

_1180

1'0

1.1

mo
mo
mo

10

mo

Models

O~TPUT

IMPEDANCE

'SERIES

RtSISTANCE

121'0
50

1'0
1251'0
240

1'0

0:55

mo
mo

mo

4

mo

SLOW

0.51'H

0.51'H
11'H
11'H

21'H 20 I'H
2/'H
41'H
41'H

SERIES

SLOW

0.51'H

0.5l'_H
11'H

11'H
21'H
21'H
41'H
41'H

VOLTAGE

Selectable,
See

Section II

of

this Manual

See

Table 1-1.

VOLTAGE

MODE

INDUCTANCE

FAST

51'H
51'H

10

I'H

10

I'H

20

I'H

40

I'H

40

I'H

VOLTAGE

MODE

INDUCTANCE

FAST

51'H
51'H

10

I'H

10

I'H

20

I'H

20

I'H

40

I'H

40

I'H

OUTPUT

SHUNT"

RESISTANCE

12

kO

30

kO

50

kO

72

kO
kO

110

kO

150

kO

200

300.k0

OUTPUT
SHUNT"

RESISTANCE

12

kO

30

kO

50

kO

72

kO

110

kO

150

kO

200

kO

kO

300

AC
(Worst Case,@

IMPEDANCE

CURRENT

SHUNT

SLOW

1,000 I'F

450 I'F 0.41'F
250 I'F 0.251'F
200

I'F 0.2 I'F
1501'F 0.15
110 I'F 0.11'F

50

I'F 0.051'F

551'F 0.021'F

IMPEDANCE

CURRENT

SHUNT

CAPACITANCE

SLOW

1,800 I'F

1000 I'F

500

I'F 0.51'F

350

I'F
200 I'F 0.31'F
110

~F

80

~tF

55

I'F 0.04 I'F

INPUT

SOURCE

113V

CURRENT
a-c,

SIZE A SIZE B

1.4 A

MODE

CAPACITANCE

FAST

11'F

JLF

MODE

FAST

2 I'F

0.81'F

0.4 I'F

0.21'F

0.11'F

2.4 A

95-113V

a-c

tap, Full Load)

SIZE C SIZE 0

6.0 A

11.0A

SIZE E

20.0A

Size

"C"

Half-

MODEL

d·c

VOLTS

RANGE

ATE 6-25M 0-6 0-25
ATE 15-15M 0-15 0-15
ATE25-10M
ATE 36-8M

0·25

0-36
ATE 55-5M 0-55 0-5
ATE 75-3M 0-75
ATE 100-2.5M 0-100 0-2.5
ATE 150-1.5M

0-150 0-1.5
ATE 325·0.8M 0-325

Size

"0"

Three-

d·c

MODEL

ATE

6-50M
ATE 15-25M
ATE 25-20M
ATE 36-15M

ATE 55-10M
ATE

75-8M

RANGE

VOLTS

0-6
0-15
0-25
0-36 0-15
0-55
0-75

ATE 100-5M 0-100

Full-

0.5

rnA load effect

0-150 0-3.5

d·c

OUTPUT

RANGE

VOLTS

0-6
0-15 0-50
0-25 0-40
0-36 0-30
0-55 0-20
0-75 0-15
0-100
0-150

ATE 150-3.5M

Size

"E"

MODEL

ATE 6-100M
ATE 15-50M
ATE 25-40M
ATE 36-30M
ATE 55-20M
ATE 75-15M
ATE 100-10M
ATE 150-7M

"Based on

1-2

R,ack

OUTPUT

AMPS

Models

OUTPUT

SERIES SERIES

RIESISTANCE

4.8
20

0-1Q
Q-8

0-3

pOJ,tfi

~!ill

o.22mn

0.5mfi

0.8mfi
2mfi

0-0.8

~.1

Qu~arter-

AMPS

0-50
0-25
0-20

0-10
0-8
0-5

AMPS

in

FAST mode.

bUTPUT

I

SERIES

~ESISTANCE

2.4

p.11
p.19

0.4

0.86

Models

'

OUTPUT

SERIES

!RESISTANCE

1.21'0 0.51'H

'

12.51'0
24
55

0.1

0.2

0.42

OUTPUT

Rack!

0-100

0-10
0-7

IMPEDANCE

SLOW

Jill,

0.5

!<H

jill

0.51-'H
1

ILH

1

gH

2

!<H
21L_H
4

!<H
4

100

!<H

1-'H

mn

Rack

IMPEDANCE

VOLTAGE

SERIES

SLOW

1'0

0.51'H 51'H

0.51'H

12

1'0
251'0 11'H
481'0 11'H

mo

21'H

mo

21'H

mo

41'H

mo

41'H

IMPEDANCE

VOLTAGE

SERIES

SLOW

0.51'H

61'0

11'H

1'0

11'H

1'0

21'H

mo

21'H

mo

41'H

mo

41'H

VOLTAGE

MODE

INDUCTANCE

FAST

5!<H

51-'H
10
101£H
20
20
40
40

1 mH

MODE

INDUCTANCE

FAST

51'H

10
10
20
20
40
40

MODE

INDUCTANCE

FAST

51'H

51'H
10
10
20
20
40
40

TABLE

OUTPUT
SHUNT"

RESISTANCE

12
30
50

!<H

72kfi

110

!<H

150

l'.H

!<H

200

!<H

300
650

Models

SHUNT"

RESISTANCE

12
30
50

I'H

72

I'H

110

I'H

150

I'H

200

I'H

300

I'H

OUTPUT

SHUNT'

RESISTANCE

12
30
50

I'H

72

I'H

110

I'H

150

~tH

200

I'H

300

I'H

1-1

DC

IMPEDANCE

kfi

11,000

kfi

5,800

kfi

2,900
2,400_pF

kfi

1,400
kfi
kfi
kfi
kfi

OUTPUT

IMPEDANCE

kO

12,000 I'F

kO

8,000 I'F 41'F

kO

5,800

kO

4,900 I'F

kO

2,900 I'F 1.51'F

kO

1,200 I'F
kO
kO

IMPEDANCE

kO

22,000 I'F

kO

12,000 I'F

kO

11,000 I'F

kO

9,500 I'F

kO

5,200 I'F

kO

3,400 I'F

kO

1,200 I'F

kO

1,050

OUTPUT

CURRENT

CAPACITANCE

!<F
!LF
!<F

1.25

MODE

FAST

5~

2

SHUNT

SLOW

11-'F

!LF

850_pF

0.75

0.51-'f

375!-'F 0.25
275

!<F
1-'F

SLOW

0.1

0.01

CURRENT

MODE

CAPACITANCE

FAST

180

SHUNT

10

~tF

2.51'F
2 I'F

1 I'F

600 I'F 0.5 I'F

440 I'F

SHUNT

SLOW

0.2

CURRENT

MODE

CAPACITANCE

FAST

15

I'F
61'F
4 I'F
3 I'F

2.251'F

1.5 I'F

0.751'F

I'F

0.31'F

RATINGS,

!LF
!<F

!<F

!<F
!<F
1-'F

I'F

I'F

ATE

POWER SUPPLIES.

ATE

A-E-07-0780A

c)

OUTPUT EFFECTS, OFFSETS AND RIPPLE SPECIFICATIONS: See Table

1-2.

INFLUENCE QUANTITY

SOURCE
LOAD (no load-full load):
TIME (8-hour drift):

TEMPERATURE, per "C:

RIPPLE AND

RIIPPLE

(1)

(2)

(3)

(4) Preamplifier offsets. The preamplifier offsets are given for the calculation

where:

NOTE

NOTE

VOLTAGE (min.-max.): <0.0005% E0 max. 0.001% E0 max.

NOISE(2)

(Slow Mode)

AND

NOISE(2)

(Fast Mode)

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

One terminal must

load

or,

in current mode, through the current sensing resistor.

Peak-to-peak ripple is measured over a

these amplifiers is used for operational programming.
amplifier offsets and the reference voltage variations are combined in the "Error Equation", which represents the
output effects for the application at hand:

~Eo

(preamp)

~Eref

~Eio

~lio

Rf
Ri

1:

Variations in the value

2:

In the Voltage Mode
the

ATE

voltage channel is given by: GAIN = E
In

the Current Mode of operation, the effect

tage

of

rms:

p-p:(3)

rms:
p-p:(3)

be

grounded for this measurement, or connected so that common mode current does not flow through the

= Total Preamp Output Voltage Change.

= Change

= Change

= Change in Offset Current.
= External Feedback Resistor.
= External Input Resistor.

voltage channel to find the total output effect on the output voltage

10 max. by the equation:

OUTPUT EFFECTS VOLTAGE MODE OUTPUT EFFECTS CURRENT MODE

Typical

<0.001 %E
<0.005%E0 max.
<0.005% E
<0.1
<1
<1

<10

~E

(preamp) =

0

in

the Voltage Reference.

in

Offset Voltage.

of

the feedback and input resistors are considered secondary effects

of

operation, the calculated preamp output effect,

mV
mV

mV

max.

0

max.

0

mV

20

Hz

to

10

max/10, where "E0 max." is the maximum rated output voltage of each

0

Maximum

0.002% E0 max.

0.01% E0 max.

0.01% E0 max.

0.3

mV
3mV
3

mV(5)

30

mV(5)

MHz bandwidth.

In

this case, the value

~Eref

(Rf/Ri) +

of

the preamplifier offsets

~Eio

of

(1

+ Rf/Ri) +

Typical

<0.002% 10 max. 0.005% 10 max.
<0.5

<0.01% 10 max.
<
<0.01% 10 max. 0.03% 10 max.
<0.1%
<0.01% 10 max. 0.03% 10 max.
<0.1%

the output effects of preamplifiers

of

on

1

mA(

l

0.01% 10 max. 0.02% 10 max.

10 max. 0.3% 10 max.

10 max. 0.3% 10 max.

0·6

mA to the current mode load effect.

the external feedback and input resistors, the

~lio

Rf.

~Eo

(preamp), must

of

the

ATE

the total outp•1t current may

1

mA(1)

0.02%10 max.

be

power supply. The (fixed) gain of the

Maximum

(A,

B)

"worst

in

the error equation.

multiplied

by

be

expressed as a percen·

OFFSETS(4)

AEio

<1
<1
<20p.V
<20p.V

if

either

case"

the (fixed) gain of

ATE

-

-

-

-

p.V
p.V

of

model.

Alio

<1
<1
<1
<2

-

-

-

-

ATE

nA
nA
nA
nA

(5)

For Kepco Model

d)

2)

e)

OPERATING TEMPERATURE RANGE:

f)

STORAGE TEMPERATURE RANGE: (-)40•c

g)

COOLING: High efficiency, single bearing fans, permanently lubricated, with special

ATE

A-E-1286A

~Eo

(preamp)

1 Volt

p-p.

1-1

for specific ratings of each model)

of

rated voltage.

of

rated current. Useable range limited to approximately 1%

ATE

325-0.BM, the maximum output ripple and noise is 10mV rms and 50mV

TABLE

1-2

OUTPUT EFFECTS, OFFSET VARIATIONS AND RIPPLE SPECIFICATIONS.

OUTPUT RANGES:

1)

VOLTAGE MODE: 0-100%

(See

CURRENT MODE: 0-100%

~1

(%) = x 100%

0

Table

100%. The maximum current is factory set to 105% of the rated output current.

o•c

to

imum output current values in Table

non-metalic

blades.

65°C. No derating to

1-1

for operation to

to

85•C.

65

55•c,

derate 10%

•c

ambient temperature.

of

listed max-

low-noise

to

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 either output terminal to ground is less than
or less than

i)

DYNAMIC SPECIFICATIONS

1)

VOLTAGE

The time
voltage setting, for a

100p,sec.

2)

CURRENT
The

ponenUal
tabulated

3)

PROGRAM
The speed ith which the power supply output responds
determined

1)

50

p,A

(P·P)

at

115V

a-c

60

Hz.

RECOVERY

required for the stabilized output voltage

FOR

A STEP-LOAD CURRENT:

to

recover to within

10

to

100% step in rated load current is typically less than

10

maximum.

RECOVERY

FOR

STEP-LOAD VOLTAGE:

stabilized output current recovers from a step in load (compliance) voltage with

r~sponse,

o~·

tput capacitance

lNG

the time constant of which is determined

(See

Table

1-1).

SPEED:

by

the load resistance and the

to

external programming signals is

by:

The

PRO~RAMMING

resistan~e

FEEIDBACK
back resi

CONSTANT

(RL)

TIME CONSTANT, given

1

stor: T =

and bandwidth (-3dB) for the Voltage Control Channel is shown in the table:

TIME CONSTANT (r), given in the

and the value of the output capacitor

by

the product of the feedback capacitor and the feed-

Rt

Ct,

whichever is greater.

In

the

"slow"

,

(C

see Table

0

"fast"

mode, the PROGRAMMING TIME

mode

1-1

):

r =

Programming

Output Bandwidth

Voltage (-3dB)
Ratings

6V
15V
25V

36V
55V

75V
100V
150V

325V

Typ.

23.0

20.0

11.5

8.0

4.8 4.0

4.3

2.7 2.5

1.8

1.5

KHz

Min.

16.0

10.6

8.0

6.4

3.5

1.7

0.94

Time Constant

(p,sec)

Typ.

7.0

8.0

14.0

20.0

33.0

37.0

Max.

10.0

15.0

20.0

25.0

40.0

45.0

60.0 65.0

88.0

95.0

110.0 170.0

5p,A

mV

of

the output

by

either the load
RL

C

or by the

,

0

(rms)

50p,sec.,

an

ex-

For the Current Control Channel, the PROGRAMMING TIME CONSTANT is
50p,sec.

2)

The MA*IMUM

the settilng of the power supply's current control setting
capacitor

k)

OVERVOLTAG~

1)

TRIGGERI~G

2)

SETTING
output

3)

THRESHO~D:

4)

TEMPERAtURE COEFFICIENT: <0.02% of E

1·4

maximum.

(C

RATE

,

see Table

0

(80p,sec.

for the

OF

CHANGE that the power supply output can respond

ATE

325-0.8M).

1·1):

MAXIMUM

RATE

OF

CHANGE =

CROWBAR SPECIFICATIONS:

TIME: <50p,sec. slow mode, <500p,sec. fast mode.

~ANGE:

volt~ge

1.6%

or

3V

for each modeL

Minimum

0.5

volts, or 2% E

(whichever Is

0

greater)

max.•

whichever is greater.

max.

0

minimum,

per "C.

25p,sec.

to

is given

(ILIM),

divided by the

ILIM/C

•

0

to

110% of the maximum rated

ATE

ATE

typical,

by

output

A-E-20788

1·10 MISCELLANEOUS FEATURES

a)

CONTROL/PROGRAMMING

1)

VOLTAGE CHANNEL: Output voltage is controlled continuously throughout the range
mounted, 10-turn rheostat. External control can
{See

Section Ill).

2)

CURRENT CHANNEL {INTERNAL): Output current is controlled continuously throughout the range

be

exercised by resistance or by a control voltage

by a panel-mounted, 10-turn potentiometer. External control can

{See

control voltage

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

0 to

1V

d-e

channel, applying a

control signal at the

REAR
over the rated current range. This same channel, properly programmed, may control the output
power supply responding to control and feedback voltages from temperature or pressure sensors,

{See

chemical reactions and the like

4)

OVERVOLTAGE PROTECTOR. The crowbar level may be controlled locally by the provided

Section Ill).

CROWBAR LEVEL control at the front panel. Remote control of the crowbar level can

0-10

connecting a

volt control source to the

ing of the crowbar level

with

the output voltage level may

REAR

PROGRAMMING CONNECTOR. Automatic track-

connection of the voltage channel programming source to the tracking input.

b)

MODE FLAG: A pair

internally-sensed current channels have control

of

panel

LED

indicators operate

of

the output.

to

indicate whether the voltage channel or the

vided through an opto-isolator at the rear programming connector.

c)

REMOTE
compensate for
nominal voltage rating

d)

REFERENCE SUPPLIES: Two dual reference sources are available at the
NECTOR:

e)

CURRENT SENSING AMPLIFIER: The output of the current sensing amplifier is available on the rear pro-

gramming connector. It provides a voltage analog
0 to +

1-11

MECHANICAL SPECIFICATIONS

a)

Refer

1-12 ACCESSORIES

1-13

ATE

power supplies are supplied

ERROR

±6.2V

1V,

corresponding to output currents of 0 to 100% {respectively).

to

the "Mechanical Outline Drawing", FIG. 1-2.

SENSING: Separate voltage-sensing terminals permit 4-wire connections to a load. Will

static

load effects up to 0.5V per lead.

of

each

ATE

model, is provided for this purpose.

d-e@

1 mA and ± 15V

with

d-e@

one Model PC-12 Programming Connector, mounted and wired for

10

An

additional 1 Volt output voltage, beyond the

mA.

of

the output current. The range

front panel output control. Additional connectors are optional and may
{unwired).

ATE

models smaller than full-rack size can

be

rack mounted, using one of several Kepco Rack

Adapters:

by

a panel-

be

exercised

be

controlled by means of a separate current

by

resistance or by a

PROGRAMMING CONNECTOR, for control

of

be

exercised by

be

achieved by means of the simultaneous

In

addition, an isolated flag signal is pro-

REAR

PROGRAMMING CON-

of

the analog output is

be

ordered as MODEL

PC-12

the

ATE

A-E-04-1388

NOTE:

STANDARD

a)

ALL

KEPCO

CHASSIS

RACK ADAPTER, KEPCO MODEL

RACK

SLIDES

ADAPTERS

AND

ARE

FIT

STANDARD

PROVIDED WITH

RA-24.

models, or a mixture of them. Filler panels

EIA

RACK

SLIDE

DIMENSIONS.

SUPPORT

THEY

BRACKETS.

ARE

DRILLED FOR

For all Kepco quarter-rack, half-rack and three quarter-rack

to

cover empty slots,

if

the adapter is not used to

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,

the adapter is not used to its full capacity, are available.

c)

RACK ADAPTER, KEPCO MODEL

three quarter-rack

ATE

models or a mixture

RA-37.

For Kepco ATE models only. Accepts quarter-rack, half-rack or

of

them. The model

RA-37

can

be

used

without

filler support

brackets when fully loaded.

its

1-5/1-6

full

if

)>

...

m

..

I

"'

~

OUTPUT

TERMINAL

1

(-)

SENSIN'3

2

(-)OUTPUT
3 GROUND
4(+)

OUTPUT

(+l

SENSING

5

AND

FUNCTION

SENSING

oo-·

D

I

D

DO_

VENTILATED

PREAMPAZERO

eRE

---·-

AREA

Io

ZERO·

\ I

AMP

B ZERO

~~EoCAG

/loMAX

--\

\

,'/

/Eo

1

~·:::1:.

ZERO

.DD

D
D

D

I

I

I'

,

4-&-(105.2)

~

Cxl

'r-

I

I

I
I

I
I

s-lz-1132.6

!

I

I

_l_

.-----

--+

PROGRAMMING_)

CONNECTOR

-----<

0

KEPCO

POWER

SUPPLY

"l

:

t]

"Q

~"""'"""'"''""

..

'

,,~,.

":."''"0

··~

u

©

/

I~:

, I

I

""'""

·;

"'~"

"~"

Q'

o

~

©~.

'r·t{'3,5lTYP

i-----1

,=-:::2',

w l

/

I

I--

3-lz

REAR

L_j

~1-fu-139.7)---1

(83.3)

-·-------1

VIEW

I '

9 I

432(108.71

+(3.2)-

!

I

:--kl7.1)

l

'I

hl_

~

"~+(15.9)

"~Ac

INPUT

SOURCE

$WITCHCRAFT

RECEPTACLE

EAC

302.

..j'

L

r

DO

D

I

I

i

D

oo_-·-·

L+l64l

curourft-xi~~

(7.9))((35.7)

---

--l-

--

17+(435.0)----

VENTILATED

TYPICAL

FOR

_

FIG.

1-2

-

AREA

80TH

SIDES

-G-·

D
D

D
D

D

_o

__

_

MECHANICAL

DO

9

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_oB

j I 0

~--~

r----

l-i-(159)

____.

OUTLINE DRAWING

~

I.

THIS DRAWING

-~

I ,

2

!

COVER

3.

4.

5.-{4)PLASTIC

6 DIMENSIONS
7

~

~~

TERMINAL

IS

ATE6

-5M,

ATE6-IOM,

ATE25-4M,

ATE36-1.5rtl,

ATE75-0.7M, A TE75-1.5M,
MATERIAL

A-CHASSI<:;:

N0-16

8-FRONT

PANEL:
N0.20

C-COVER

FINISH

A-CHASSIS" CADMIUM
8-FRONT

PtlNEL:

COLOR

NO,

26440.

C-COVER:

CHARCOAL GRAY VINYL.
RACK MOUNT lNG. 'lEMOVE
CHASSIS.

MOUNTING

SELF-THREADING

IN

TOLERANCES

PARENT11ESIS ARE lN

A-BETWEEN

MOUNTING

B-ALL

FRONT PANEL DIMENSIONS

C-ALL

OTHER

USED

FOR

THE FOLLOWING MODELS

ATE

15-3M,

ATE

36-3M,

ATE

100-0.5

GA.

C.R.S

1/8 THICK ALUMINUM.

GA

C.R

S.

PL.

ATE

WiTH

LIGHT

'3RAY PER

(4)

FEET

INSERT

SCREWS(

WITH

HOLES±

DIMENSIONS±

1/32(±0

ATE

15-6M,

ATE.55-IM,ATE55-2M

M,

ATE

CHROMATE

FEDERAL

TI:.XfURE

FROM BOTTOM

UNDE"!

FEET,

l/8

THICK

MILU~~ETERS

1164(±0

4)

TO

MIL-STD-189.

B), E.XCEPT

ATE25-2M
100-lt.i.

WASI-L

STD.595,

FOR

MOUNTING

OF

8-1Sx518

AS

PLATE).

NOTED.

2-1

UNPACKING AND INSPECTION

2-2 This instrument

has
careful unpacking, inspect
tional

check

as

outlined in paragraph 2-8 below.

with

the responsible transport service.

2-3 TERMINATIONS

a)

FRONT
b) REAR
c)

INTERNAL

PANEL

RefertoFIG.2-3andTable2-3.

been

thoroughly

tor

Refer

CONTROLS

SECTION

II-

INSTALLATION

inspected and tested

shipping damage before

If

tc

FIG. 2-2 and Table 2-2.

Refer

to

FIG.

2-1

and Table 2-1.

prior

attempting

any indication

to

packing and

to

operate. Perform the

of

damage

is

found,

is

ready

file

for

operation.

preliminary

an

immediate claim

After

opera-

REFERENCE

DESIGNATION

R17

R24
R32
R39
R62
R63

TABLE

CONTROL

1

MAX

0

LAG

E

0

E0 ZERO

1

ZERO

0

PREAMP
PREAMP

2-1

INTERNAL

...------R62

"B"

ZERO

"A"

ZERO

CONTROLS

.....-----R63

.------R39

AND

THEIR

PREAMP.

PREAMP.

Io

ZERO

PURPOSE

Maximum
Voltage

Output

Channel
Voltage Channel Zero
Current Channel Zero
Offset Zero

Offset Zero

FUNCTIONS

"s"

ZERO

"A"

ZERO

Control
Control

.

Current

Stabilty

Control
Control

for

tor

Control

PREAMP
PREAMP

"B"
"A"

AT!~=:

l/4-2078

FIG.

2-1

LOCATION

OF

INTERNAL

CONTROLS,

ATE

1/4

RACK

GROUP.

2-1

0

KEPCO

POWER

SUPPLY

0-

0-

0-

~

ON

OFF

0

0

2-2

NO.

1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

fiG.

2-2

i

CONTR~L

VOL

TACiJE
A-C POWER
CIRCUit

"V"

MOPE

CONTROLS

OR

TERMINATION

CONTROL

SWITCH/

BREAKER

INDICATOR

VOLTM~TER

AMMET
"I"
"LEVEU"
CROWBAR
"DISARM"
CURRENT

MODE

TABLE

R

INDICATOR

CONTROL

INDICATOR

PUSH-BUTTON PUSH TO SET CROWBAR

CONTROL

2-2

CONTROLS

AND

TERMINATIONS,

AND

TERMINATIONS,

ATE

1/4

RACK

GROUP,

ADJUSTS
SERVES AS A-C POWER SWITCH
LINE
ENERGIZES
MONITORS
MONITORS
ENERGIZES

ADJUSTS

LIGHTS

ADJUSTS

OUTPUT

"OFF"

OUTPUT
OUTPUT

TRIGGER

WHEN CROWBAR

CURRENT

ATE

ON

OVERLOAD

IN

VOLTAGE

IN

CURRENT

1/4

RACK

VOLTAGE

VOLTAGE
CURRENT

LEVEL

FROM

FRONT.

FUNCTION

MODE

MODE

OF CROWBAR

IS

TRIGGERED

TRIGGER

0-100% 1

GROUP,

FRONT.

FROM

AND

O-E
0-1

0

ZERO

TURNS

max.

0

max.

LEVEL

max.

0

TO

E

0

A-C POWER

CIRCUIT

"ON"

ATE

1/4-2078

max.

0

2

o---

D

I

'

I

l

NO.

1.

2.

REAR

MATING

OUTPUT

50

TERMINALS,

49

0

ATE

FIG.

TERMINATION

CONNECTOR

(REAR VIEW)

2-3

TERMINATIONS,

(PC-12)

TB201

I

I

D I

o

__

D

0

~D@

ATE

1/4

RACK

GROUP,

FOR

EXTERNAL

AND

ALL

1)

(-)

SENSING

2)

(-)

D-C

3)

GROUND

4)

( +) D-C

5)

(+)SENSING

REAR.

OTHER

OUTPUT

(CHASSIS

OUTPUT

FUNCTION

PROGRAMMING

PROGRAMMING

CONNECTION)

SOURCE

FUNCTIONS.

INPUT

ATE

3.

1/4-2078

A-C POWER

TABLE

2-3

INPUT

REAR

TERMINATIONS,

ATE

1/4

RACK

ACCEPTS 3-WIRE A-C

GROUP,

WITH

PROGRAMMABLE

(SUPPLIED)

INPUT

CORD

VP,

REAR.

2-3

2-4

A-C

INPUT REQUIREMENTS

2-5 This power supply

to

other

a-c

source voltages, refer

strip

of

barrier
effective at all

T201 according

input

is

normally

voltages.

supplied

to

for

operation

to

FIG.

2-4. Select

the table provided in

on a single phase,

your

nominal

FIG.

source voltage and change the

2-4. The

nominal

circuit

115V

breaker (CB101) remains

a-cline.

For

conversion

links

on the

equally

AC

SOURCE

104V
115 v

208V
230V

2-6

COOLING

2-7 The power transistors and rectifiers in the

ture

range

by

THE

TOP OF tTHE CASE

CIRCULATION.

is

rack rnounteq, or installed

perature

imme~iately

CONNECT

LINKS

3)-

(4) 1 (7)

-(8)

~4)-(5)1(6)-(7)

(2)-(3) I (8)-(9)
(5)-(6)

ATE

-1/4

RACK

FIG.

2-4 A-C

INPUT

SOURCE

teans

ot

special heat sink assemblies, cooled

MUST

Periodic cleaning

surrounding the power supply) does

into

BE

KEPT

of

the

confined

VIEW 1 COVER

SIDE

1

VOLTAGE

ATE

interior

spaces, care must

SELECTION,

power

CLEAR

of

supplies are maintained

FROM

the power supply

T201

REMOVED

ATE

by

internal fans. SIDE

OBSTRUCTIONS

be

taken

not

rise above the

1/4

RACK

is

recommended.

that

the

GROUP.

within

PANEL

TO

ambient

limit

specified (refer

---•FRONT

their

operating tempera-

OPENINGS

INSURE

temperature

If

PROPER

the

power

to

Section

AND

AIR

supply

(the tem-

1).

2-8

PRELIMINARY

2-9 A simple operating check

the power supply

location

a)

b)
c)

d)

e)

2-4

of

Connect

Turn
Turn
gi;ed.

voltage. The
Check the overvoltage

1)

2)

3)

4)

!J)

Place a short
Turn
CONTROL

read

CHECK-OUT

has

suffered damage resulting trorn shipment. Refer

the operatinq

~ower

supply

C~RRENT

A-q

POWER

SltJwly

Turn

Der1ress
until

Turn
To

TROL
control

Turn

the

lui

turn

VOLTMETER

the

VOLTAGE

the

the

CROWBAR

VOLTAGE

reset the adjusted crowbar

clockwise.

if

necessary,

A-C POWER

circuit

ATE

"on".

clockwise and observe the

II

scale.

after

unpacking and before permanent

controls

CONTROL

SWITCH/CIRCUIT

DISARM

and

output

to

115V

a-c
tully

VOLTAGE

should

"crowbar"

CONT

push

INDICATOR

CONTROL

Note

voltage at

by

repeating

SWITCH/CIRCUIT

across the
THE

CURRENT

CONTROL

circuit

R 0 L

button

ATE

terminals.

source

clockwise.

BREAKER

now

read

to

slightly

point,

ster

output

MODE

installation

or

refer

to

par. 2-4

Turn

"on".

clockwise and observe the gradual increase

full

scale.

as

follows.

about

one-half

and

turn

the (recessed)

larnr

lights up.

counterclockwise

press

DISARM

which

the

CROWBAR

(2) and check

BREAKER

terminals.
indicator

grad11al

increase in

for

other

VOLTAGE

The

VOLTAGE

of

its range.

and release

button

INDICATOR

21gain

by

"off".

Turn

CURRENT

should

now

output

is

advisable

to

FIG.

2-2 and

input

voltages,

CONTROL

VIX

LEVEL

control

DISARM

again and advance

lights up. Readjust

repeating steps (3) and (4).

CONTROL

be energized.

current.

The

to

ascertain

to

FIG.

if

required.

fully

counterclockwise.

indicator

slowly

counterclockwise

button.

VOLTAGE

counterclockwise.

Slowly

AMMETER

2-3

should

of

the

turn

should

ATE

whether

for

the

be

ener-

output

CON-

LEVEL

CURRENT

now

1/4·2078

2-10

INSTALLATION

2-11 The Power

mounted,
For

2-12

2-13

all installations

unit

does

GROUNDING

a)

A-C
plug.
2-terrninal
supply

strip)

I

SO

b)

nection

terminals and ground
supply. Either side

(Refer to FIG. 1-3 "Mechanical Outline Drawing")

Supply

the (4)

not

(SAFETY)

The

for

LA

may be rack-mounted

bottom

feet must

into

confined spaces, care must be taken that the temperature

exceed the rnaxirnum specified

GROUND.

third

(green)

rf~ceptacle

be

returned

to

The

wire

in

combination

a-c

ground

this purpose.

Tl

0 N

FROM

GROUND.

to

chassis

or

ground.

or

chassis

of

the

output

or

operated

be

removed.

ambient

power

supply

in the line cord

with

an

with

a separate lead. A

The d-e

Thf~

r11ay

rnaxirnurn

is

500V

be

qrounded.

output

(d-e

as a "bench-type"

temperature

is

equipped

is

connected

adapter

is

used,

(65°C).

with

to

the chassis and the

it

is

grounding

is

isolated

output

or

peak), plus the maxirnurn

from

voltaqe that

instrument.

If

the

immediately

ATE

is

to

rack-

surrounding the

a 3-wire safety line cord and polari?ed

case

of

the

unit.

If

imperative

terminal

the

can

that

the chassis

is

provided (at the rear barrier

a-c

source and

b(]

supported between either

output

from

voltage

of

any

direct con-

of

the power

output

the power

a

A resistor/capacitor network
chassis
chassis

of the power supply

can

be

opened by

changing

(R59,

(via

ATE-

C27),

OD-1).

the wire

1/4

is

connected from the negative output terminal to the metal

If

the

internal

lug

position from OD-1 to QC-2

RACK

signal

ground

0!)

QD2

is

not

desired, the connection to the

(See

FIG.

2-5).

CONTROL ASS'Y.

(P.C. BOARD)

ATE

1/4·2078

FIG.

2-5

CONNECTED

LOCATION

VIA

OF

INTERNAL

QD-1.

TO

SIGNAL

REMOVE

GROUND.

SIGNAL

SIGNAL

GROUND,

GROUND

PLACE

WIRE

NETWORK

LUG

ONTO

SH

QD

WN

2.

2-5

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

/ow

source must have
presence of

loads with capacitive and/or inductive

relying to a great extent upon a

output impedance, good output voltage stability and good dynam1c stability

content

The oower supply achieves these design goals by

large output capacitor having a very low terminal impedance. large energy stor­ing 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

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
To

2-16

satisfy these conflicting requirements. the
from the
an

stability
pletely

"slow"

mode to the

ideal voltage source Heavy output and feedback capacitors provide for low output noise. excellent voltage

art1d

good transient response.

removed, thereby providing the charactenstics of a wide-band amplifier, ideal for applications requiring

"fast"

level. while the load

ATE

power supply was designed for quick manual change-over

mode of operation.

In

tile

"fast"

mode, the output and main feedback capacitors are com-

In

is

the

changing

"slow"

mode. the

ATE

power supply approaches

a current stabilizer or for high speed voltage or current programming.

2-17 MANUAL

"slow"

mode.

from the

CHANGE-OVER, SLOW/FAST MODE.The

By

changing jumper connections

"slow"

mode to the

"fast''

mode or vice versa (See FIG. 2-6).

ATE

power supply

at

the rear of the power supply, the user can quickly convert

is

normally delivered for operation

in

high

1n

the

out-

the

PC-IZ

-S

l®I§M¢11JI®F~~

~w~

ATE

1/4

R

CK

FIG.

2-6

REQUIRED

"FA$T MODE" CONVERSION

-OUT

STEP i

STEP 3

STEP 5

STEP Z

STEPS

GRD.

-i-OUT

FOR

+S

ODD

....

ooo

ATE

1

TO

ACINPUT

SOURCE

(}

NOTE: For

tors
capacitor
device,
load

to be

circuit.

STEP

STEP

STEP

STEP

STEP

fast

or

relays

may

be required

or

the

power

terminals. A

adequate

1:

Remove
(43)-(45)

on

Links

PC-12.

the output capacitor

2:

Remove

jumper

(45)-(47)

This removes the main feedback

(26)

(C

to

).

1

(27).

capacitor
Connect wire jumper

3:

from

lag network_
Refer to Section

4:

remove the internal grounding
network.

Connect wire jumper from

5:

(48)

on

PC-12.

This introduces are-

in

the crowbar circuit.

into a load

the

contacts

terminals,

capacitor

(0.01

triggering

mode

operation

("Arcing

supply

ceramic

to prevent

quired delay

Load"), a small, high-frequency-type
across

output

disc

spurious

(19)-(20) and

This removes

(C

).

0

on

PC-12.

on

PC-12

This connects a

II,

FIG

2-5

and

(39)

interrupted

or

by

of

the

interrupting

directly

across

,F)

has been

1

of

the overvoltage

contac-

found

to

the

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

results
however,
the

and

noise

ded importance

2-19 LAG

by means of an internal

each application, by monitoring the

irl

greatly improved power supply performance

is

reduced, making the output sensitive to the load phase angle. For this reason. the load presented to

powEjr

supply

in

the fast mode must not contain excessive capacitance

mai~

feedback capacitors removed, there will be an increase

and pick-up,

NETWORK ADJUSTMENT The

so

that external shielding of programming leads and good grounding practices assume

in

the fast mode operation. See also note

ATE

power supply operating

lag network

(E0 LAG, R24 see FIG.

load with an oscilloscope and turning tne

in

these areas. The power supply's dynamic stability,

(limit 1 OOOpF).

in

the output noise, mainly high frequency

in

FIG. 2-6.

in

the

"fast"

mode.

2-1

for !ocation). This control should be adjusted, for

LAG

Also, with the output

is

dynamically stabilized

control for best output

respons$ and maximum dynamic stability under all operating conditions

2-6

CROWB~R

2-20

in

the

load !

OPERATION, FAST MODE. The crowbar circuit

"ffst"

operating mode, but continues to offer protection against

in

the

ATE

power supply

d-e

voltage surges which may harm the

is

not completely removed

ATE

'/,-2078A

in

the fast mode

ad-

SECTION

Ill-

OPERATION

3-1

3-2 Interconnections between

3-3 SAFETY

GENERAL

an

a-c

power

source and a stabilized power supply, and between the power supply
and its load are
mance

is

expected, certain rules

the user. These rules are described in detail in the

as

critical

as

the interface between

for

the

interconnection

other

following

types

of

source,

paragraphs.

of

electronic

power

equipment.

supply and load must

GROUNDING

3-4 National and international safety rules

to

the

a-c

connected

power source.

KEEP INSTRUMENT GROUNDED WHILE

3-5 Kepco power supplies

connected

3-6

3-7 Connections between the power supply and the load (load and sensing connections),

3-8 Successful d-e

D-C

the
of

wire-pairs, etc.,

one side

be

provided here. One
when
separated grounded
only
means
output
this
dependent on the
at one
employed,

ground

3-9

ATE

(refer

signal ground must

power

or

the negative
given
are, howver, equally valid

noise at the
ripple

3-1

In
ground
of
value between

to

a grounded

(OUTPUT)

power supply amplifiers (programming connections) may, despite all precautions such

of

the power supply

~Jrounding

two

(or more) points are grounded along

way

to

avoid ground loops

of

an

ohmmeter

circuit

is

point

is

returned

of

the

output

d-e ground

is

automatically

Power Sup pi

to

Section

supply

case

to

the ground

power

and noise

the

case

where

potential,

the

power

supply

0.1

with

flexible

a-c

power

GROUNDING

"pick-up"

depends on careful analysis

of

the major

points,

a noise voltage

for

completely

to

ground

application

terminals

can

be

established

ies

have

one

II,

Par. 2-13). In those

be

established elsewhere, the resistor/capacitor

in order

output

supply

into

the

grounding can

and 1 microfarad

of

the power

point

the

circuit.

load must

output

to

producing
for

output

radiated noise

output/load

any resistance
isolated, a single

with

at hand.

established at the remote load. In

side

avoid ground

either

to

dictate

the grounding

WARNING

IT

a-c

power

cord are equipped

outlet.

of a wide

circuit

should

points,

is

to

of

the

directly

or at

be

be

accomplished

the

has

however,

the

is

developed

investigate

a single wire. The exact

For

power

of

the

cases,

supply

the

output

the

kept

signal ground. The size

been

the

to

ground. A single d-e ground

point

single, isolated loads, the d-e

supply

at

the

load.

output

therefore, where the load

loop

problems.

for

the d-e ground

least noise.

side grounded. Care should be taken in measuring the ripple and

load. Measuring devices

completely

found

of

the metal cover and

'

IS

CONNECTE.D TO

frequency spectrum. To

be

grounded.

of

the individual situation and

is

to

avoid

outpl.!t

output

is

returned

Output

by

means

to

circuit.

which

subsequently

circuit

selected along the power supply

location

which

may

to

If

there

point,

ripple specifications

off

ground (d-e isolated)

of

a suitable capacitor connected

of

be

successful in many

THE

with

a 3-prong safety plug,

GROUND

(including

be

case

the

case

which

the capacitor should

LOOPS. Ground loops are created

Due

to

of

this

"best"

ground-point

connected

of

an

over a resistor/capacitor

is

combination

is

a choice in selecting either the positive

both

sides should

area-cline

cases.

A-C

POWER

minimize

the

wire

is

superimposed on the load. The

the connected load)

point

to

internally

internally

must

(as

or

If

optimum

be

observed

case

of

any instrument

SOURCE.

which

as

well

as

connections

as

shielding,

these undesired effects,

only

general guide lines

impedance between the

carefully

can

be

selected

output/load

d-e

ground-point
may

be

ground.

grounded load, the d-e

grounded,

be

removed

be

tried,

measured at the

operated

it

must

be

carefully

only

circuit

is

located

If

error sensing

combination

or

where the

from

and preference

often

introduce

be

operated above

from

either side

selected. A

perfor-

by

must

be

twisting

can

by

if

the

and
entirely
directly

the

output)

to

is

ATE

1/4-2078

3-1

3-11

l

vr:r1

srrnplr:

with

2-wire
cxlf:111al proqrarnmirlrJ sources
have been solved and a single
evaluatr:cJ
used

fur
initial

the

programming
possible,
"floated;"
the

selr-x:ted d-e
or

the

ATt,asdescirbed

n~rnutt:

shielding cable,

for

prugrarnming,

prublr;rns

becausEc

i.r-:.,

polarity

control

systern

,

the

power

1

sour·ce
of

poiCJrity considerations, three choices are open r"ithcr

it

illUSt

CJIOlllld

ot

thr: progran1rninq source rnust

in

thrssertion.

tasks, such

with

the

arP

qround

compatibility.

since

their

supply/load

"common"

opercltE:

above

point

rnust be changed to thr; poiCJrity

as

error

shield

(sincJie-rmcJ,;cJ)

used,

additiorlill

point

has

Sorne

ot

the

casr~s

are connected

systr:rn rnust havr:

must

be

connected

ground

by

sE:nsinrJ

precautions

beer1

assigm:d

older

permanently

an

arnount

be

or resr;tclrlUc pruqrarnrnrng, rr:qr1ire careful shielding

rr:tumr:d

signal qr:nerators. tor

the

to

the pr-eviously

givr:n

wversed

tr1

the srrlqlc d-e

are required.

to

the system, the

to

one

of

cormct

coirJCidmCJ

hy

"polarity"

hy

the

output

with

usirl~J

the unc:ormnitted prearnplitic;rs

ground

If

all

other

proqrarcming

example,

the

output

tor

voltaqe

grounded

the

output

prograrnminCJ sor1rcc

vnltaqe

that

ot

thr-~

point.

In

grounding

source

cannot

leads. Aside;

ot

br:

programing;

side.

the

powr:r

pruqrarmninq

casus

wlH-:rc

problems

must

successfully

frurn

thesE:

e.g.,

If

this

is

not

must

supply,

source,

of

br:

be

or

the

3-12 POWER

SUPPLY/LOAD

3-13 The general

the

c:ormectrd load. The load may have

predominantly
or

1t

rnay
application,
and

specify

is

to

aid

the

3-14 Thr:

3-15

perfect

output

from
ments,

considr:n-;d in

with

sources

terminals

the

powE:t sr1pply or environment_

inwrconncctrng

LOAD

WIRE

;ero

frequencies

helve

w

u

z

<{

0

w

0..

:Eo

-111

.....

~

:::)

0..

.....

:::)

0

--~-4------------------------------~~~~

INTERFACE

function

be

location
the
user in

interface

selectinCJ

output

All
an

of

a vultaqe or

resistive, capacrtive,

a consicJerablr: distance away

or naturr?

pcrfmmancc

the

would

SELECTION.

impedance

at thr:

final

usA

betweer1 a powt:r surrrce and its load

be

transfer·red

rules

the

interfacr; wir1ng.

The

current

ur

ot

the load.

output

ot

the

must

bE:

stabili;ed

(VOLTAGE

any

inductive

product

without

To

dosely

voltage sources have sornr:

output

impedance

which

decreases

stabiliLed

conceivCJblr;

The

He

rnust design his producL

terminals

impairment

approach

followed

d-e

power

MODE)

amount

power

parameters;

power

of

the

The

intertacr'

this

and

supply

or

infinite

of

impedance

with

frequency

characteristic

supply

power

would

to

ideal, the power

supply

is

it

may

br:

dcsiwwr

supply.

of

the powr:r

mean

any

load, regardless

Ohm's

Law,

is

definitely

output

which

(refer to FIG_ 3-1).

VOLTAGE

__________

-

-.......

(INCREASING

OUTPUT CIRCUIT INDUCTANCE)

"'

"

"'

"'

'~-----------------

FREQUENCY-

"'

"

".cuRRENT

"'

(DECREASING i!!o WITH FREQUENCY

DUE

to

dr:liver

the

ll

rnay be

lrlCCJWd

cannot

fur

that

rrut

rrnpedancc;

increases

fixed

very close to the

anticipate

the

widest

The

aim

supply

and the load.

the

specified

ot

supply

must

as

well

as

an

ideal voltage

with

MODE

i!!o

DUE

MODE

TO

OUTPUT CAPACITOR)

rated

output

quantities

or variable;

possible applic:aticm range

ot

the

following

performance

its characteristics, distance

satisfy certain require-

basic

a-c

(CURRENT

frequency

it

may

power

cNr-;ry

conceivable

paragraphs

theory

or

current

MODE)

and all current

havr:

supply

at the

must

source

at

IMPEDANCE

TO

IMPEDANCE

to

be

all

NOTE:

3-2

FIG.

Load

connections

stabilizr;d
a)

D-C

wire

com

pi iance vol.tage.

b)

Wire

inductance

Emphasis
current

source

3-11YPICAL

output

in

drops

the

voltage:

following

OUTPUT

for

application

do

not

is

"swamped-out"

paragraphs

IMPEDANCE

requir·ing solely

influence

the

currc;nt

by

the

is

therefore

VS.

FREQUENCY

stabrli;ed

stabili;ing

actron

of

the

piaced on

PLOT

output

action,

output

the

FOR

STABILIZED

current are

but

capacity_

power

must

supply

D-C SOURCES.

not

as

critical

be

subtracted

as

a voltage source,

as

from

those

the

rather

ATE

requiring

available

than

l/4-2078

a

A more realistic model
representing
source impedance at higher frequencies. Load
The load-wire size should
will

take care

to

the source inductance

considerations are especially

1) The load

2) The load

3) The

4) The load

5)

i

LOAD

3-1~

3-1

3-1

Kepco

i

I

at the rear
Although

as

a general guide in the

(Refer

to

the programming connector (PC-12) and
replaced at
FIG.
crowbar

the small d-e and

of

that),

is
is

output

has a primarily

All

other

cases

CONNECTION,

has

provided a group

of

the power

all

applications

to

FIG.

3-2). The Kepco

will,

3-2, the links are connected

level

with

for

a voltage stabilized

not

but

also the series inductance

of

important

constantly
switched

of

the power supply

where the

depending on the operating mode and

the power supply operating in the

changing in value.

"on"

GENERAL

of

supply,

tend

interconnection

soldered, links on the barrier strip

OR

THE

MATING

JACK

WILL

power

supply must,

low

frequency source impedance, in series

wire

selection should

only

be

selected

the power supply

if:

and

"off."

is

step programmed.

reactive characteristic.

dynamic

terminals

to

CAUSE

which

exhibit

power

for

must

front

output

on

permit

between power

supply

be tightened. LOOSE

MALFUNCTION

for

(Error

response

the

programming

maximum

their

own

is

shipped

to

the barrier

panel (local)

minimum

of

the load

Sensing cannot compensate

of

the

flexibility

problems, the basic

supply

from

strip

application

control

"slow"

mode. Links remaining on the mating jack

OF

for

therefore

voltage

connector

THE

drop

wire

must

power

supply

PC-12 and on the barrier

in

power

interconnections

and load.

the

factory

(TB201

of

the

of

the

output

WIRES

OR

POWER SUPPLY.

example, include a series resistance,

with

an

inductance, representing the

proceed

(Error

be

kept

is

supply/load

with

).

These

power

with

those facts in

Sensing,

as

considered

several

links

supply. Positioned

voltage,

as

small

as

possible compared

for

this). These

important.

interface techniques.

described may

jumper

may

output

mind.

discusses

I inks, connected

be

current

below,

dynamic

strip

(TB21 0)

be

used

removed and

as

shown in

and VP

must

LINKS

AT

THE

BARRIER

STRIP

be

ATE-REAR-

PROGRAMMING

CONNECTOR

PC-12

0

12

I I

14

31

16

5 I

18

71

110

91

112

II

I

114 131
116 151
118 171

t'2o"i9'1

22

21

24

23p

~:

~;I

f3o"29't

32

31

f'3433't

U

36

35

!~

;~I

t'424i't

44

43B

@

46 45

148

47

50

491

0

0

l

ll1~()~11~~~~()~1ll

-S

(-)

GRD.

(+)

+S

o---o

I

NOTE: Additions

I

I

D

oD

VENT-AREA

and

from

jumper
PC-12

application

connections

will

VENT-

AC

INPUT

c::J

c::J

or

deletions

the

standard

on

be

listed

diagrams.

AREA

on

_D

c::J

0

1

I

to I
all I

I

AT!E

l/4·2078

CONTROL

FIG.

OF

3-2

STANDARD

THE

OUTPUT

JUMPER

VOLTAGE,

LINK

CONNECTIONS

OUTPUT

CURRENT

FOR

AND

LOCAL

VP

CROWBAR

(FRONT

LEVEL

PANEL)

(SLOW

MODE).

3-3

3-19 LOAD CONNECTION,

3-20 (Refer

to

FIG.

3-3).
loads, located close
connection
The load leads should be

rules have been applied (refer
operation

from

may commence.

PC-12

12
14
16

18

110
112
114
116

to

the rear

~1-.=;.<)--------~rr

ATE

1/4

RACK

METHOD

The

most basic

the

power
output

tightly

I (LOCAL ERROR SENSING)

power

supply

interconnection,

supply,

terminals. Load

twisted

to

par. 3-3

or

for

loads requiring stabilized

wire

is

to

reduce

to

3-11),

"pick-up"

the

power

'T'

ODD

1-DDD

TO

ACINPUT

._j-

selected

from

supply can

to

primarily

current

as

described previously (refer

stray magnetic fields.

be

resistive, relatively

exclusively, consists

connected

NOTES:

1)

For
connections
the
be made
is

applied.

2)

Alternate

points

refer

31

Twist all

shielding

to

Operator

power

After

the

supply

before

signal ground

may

to

PAR.

wire

as

indicated.

constant

of

to

par. 3-15).

the

grounding

a-c

source and

Safety all

to

and

from

should

a-c

power

be chosen :

3-6.

pairs. Use

2-wire

3-21

3-22

NOTE:

FIG.

When

using

long

load

observed

and

at
CAPACITOR
SING

terminal

Remove

jumper
NECTOR.
terminal

Connect a short

on

FIG.

LOAD CONNECTION,

To

avoid excessive

from

the sensinq terminals

wire

(refer

to

positive sensing wire

For

lonq

wire

cases.

3-4

LOAD

CONNECTION,

USING

REMOTE

FIG.

runs,

output

34).
qoes

twisting

ERROR

ATTENTION

remote

error

sensing

sensing

the

load.

should

and

(45) -(47)

the

rear

wifes,
To

be

disconnected

reconnected

barrier-strip

with

low

frequency

eliminate

to

on

the

wire

from

(TB201).

the
from
the
REAR

3-3

LOAD

CONNECTION

METHOD

Observe polarities The negative sensing wire must

to

METHOD

large

problem

the

( - )

II

(REMOTE ERROR SENSING)

effects at remote loads, error sensing must

directly

SENSING.

capacitive

oscillations

( - )

to

the load

the positive load wire.

each sensing

II

loads

may

the

FEEDBACK

OUTPUT

OUTPUT

terminal.

PROGRAMMING

pin

47

to

the

(-)

OUTPUT

wire

and

be

SEN-

CON-

METHOD

will

with

I,

compensate

its associated load

PC-12

12
14
16

18

110
112
114
116

ATE

1/4.

LOCAL

for

RACK

ERROR

be

load

SENSING.

used. A

wire

wire

twisted,

voltage drops up

go

to

the negative load wire, and the

may give improved results in some

shielded pair

to

TB

201

0.5

of

volt

TO

ACINPUT

wire

per

~1-.=;.<'--------~rr

~

3-23 This method

current

poe

"~24

or

for

foe

of

load

interconnection

proqramming

rd

coonectioo;

is

suitable

with

gradually changinq waveforms (sine .vave, triangular wave shapes, etc.).

;ccitoble

lm

mpid

"""'

for

!oads

which

chooge;

do

io

the lmrl m

not

require rapid changes in voltage

IP

pcogmmmiPg.

3-4 I ATE

or

See

114-2078A

3-241

3

2~)1

LOAD CONNECTION, METHOD

Th1s

method
value, or
dynamic
tlccted at the

FIG. 3-41.

is

suiwhlc

if

th1;

power supply

perforrnance

powm

OPEN JUMPERS:

19-20),(4:3-45)

(

if

step clrorlqc:s in

is

expected

supply and lm>uDhi

PC-12

12

14
16
18

Ito

112

114

116

Ill

is

proqrarnrrwcJ

direcily

tiH~

load

with

at the

with

a heavy,

cHe

step

ll>dri

tcnnirrals.

twist~-ed-wirfc

rf, tor

functions

lrr

ex;:nn1>1e,

(square wave, pulse,

these

pair

TWIST 8

SHIELD

DOD

t-ODD

cases,

directly

r

TO

the load

the

AC

SOURCE

is

rapidly

Ec:tc.)

e:md

output

capacitor

to

the remote load (refer to

INPUT

chanCJing

maximum

isdiscon-

in

FIG.

3-5

LOAD

Since the
nected
the
connected in the power supply (by connecting ( 1 )-(3) and
with
times
load exclusively.
capacitor should
the external capacitor, the desired response and the
minimum,
should

NOrE:C

NO

0

Power Supplies (SEE

E:There

applications,
the

most
Engineering

to

power

another

be

be

output

the load,

achieved

comparable

supply

high

the RC

capacitor

it

is

quality
by

For

be

time

= C208 and R0 =

is,

unfortunately,

location

output

circuit

is

cases.

For

help in special

Department.

is

now

removed

may

be

p,'ssible in some

concerned.

disconnecting the internal C0 and operating

pulsed loads

paralled

constant

with

R11

"MAIN

no

and nature

of

great

If

oscillations are observed at the

capacitor

with a "bleeder"

the internal

rn

importance.

of

which

of

the external

output

1/2,3/4

SCHEMATIC,

"best"

and

method

of

the load requrre careful analysis

applications

a value equal

drop

R0 ext.

It

CONNECTION,

from

the

cases

to

;ero

resistor. The value

output

capacitor

C0 ext.,;;;; R0 C

full-rack

"SECTION

is

ATE

for

rnterconnecting the load and the

hoped

that

or

difficult

METHOD

output

that

to

amount

terminals

it

can

no

longer

(5)-(7)

on

or qreater than C

with

current

capacitor

(C

VI,

the preceeding paragraphs

during

of

of

output

(C0 ext.) and the bleeded resistor (R0 ext.)

)

and the bleeder resistor ( R

0

0

Power Supplres, C

FIG 6-3 FOR

problems,

G-

Ill.

of

the power supply and

perform

output

this

consult

or at the load, C

TB201).

.

Alternately,

0

an

externaly

the

"off"
resistor
current

= C6, R0 =

0

VALUES).

111

each

case.

directly

The load should

is
which

directly

its bypass

bypass capacitor across the

period, any external

determined

power

Groundmg

will

with

function

should

0

be

good results can some-

by

can

be

sacrificed.

),

so

that:

0

R2031n

be

1/4

supply.

a single

of

some assistance in

Kepco's

con-

as

far

be

decoupled

output

the value

As

rack

ATE

Individual

point

Application

as

left

of

a

in

3-2r

3-2,

ATE

VOLTAGE MODE OPERATION (FRONT PANEL CONTROL)

Once the load
rules have been applied

1)

Turn

and adjust

l/4-2078

B

REA

is

connected

VOLTAGE

I<

E R

"on"

VOLTAGE

to

the

output

as

described (refer

CONTROL

(The voltage mode

CONTROL

completely

to

terminals

to

VI X indicator

the

of

par's.

counterclockwise.

dc;s1red

the

3-1

output

ATE

through

should

voltage level.

Power

3-26),

be

"on").

Supply

power

Turn

and safety,

supply operation can proceed:

A-C POWER

Observe

Turn

a-c

as

well

SWITCH/CIRCUIT

front

panel

power

"off".

as

VOL

grounding

TM

E'TE

R

3-5

3-29

3-20

2)

Tum

the

current

3)

Apply

a short

CIRCUIT

4) Observe

value, plus 2%. In voltage rnode

point.

5)

Remove the short

CURRENT

Note:

Refer to Section

Apply

all safety and

3-16). Proceed

1 I BEFORE connectinq the load

CIRCUIT
VOLTMETER
Turn

terminals

2)

Turn
and adrust

indicate
CIRCUIT

3) Remove the short
If

resistance

front

Turn

MODE

as

A-C POWER

A-C POWER

that

the

ATE

increased, or the CUR R E

control

circuit

BREAKER

panel

A-C POWER

circuit

OPERATION

l,par.

output

follows

BREAKER

and adjust the

of

the

ATE.

SWITCH/CIRCUIT

CURRENT

the

power

BREAKER

circuit,

does

not

(R

L)

is

too

cornplctcly

across thr;

"on"

(the

CURI~ENT

SWITCH/CIRCUIT

frorn the

(FRONT

2-14

for

woundinq

"or"

SWITCH/CIRCUIT

co'ltrol

supply

"OFT'.

connect

enter the

high. Either R L rnust

r~T

cmmterclockwise.

outputtemlinals

current

METER

fast mode conversion

(the voltage rnode

VOLTAGE

to

is

current

CO

NT

mode

and adjust

operation,

output

PANEL

rules

to

the

the desired value. The
truly

the load

RO

this setting

BREAKER
terminals. The power

CONTROL)

as

describ~;d

power

control

BREAKER

BREAKER

in the

and

rnode

be

L setting rnust

of

the

ATE

VIX

indicator

CURRENT

will
"off"

of

the

in

pwvious

supply

VIX

current

(as

output

indicator

to

the required cornpliance

"off"

"on".

Observe the

current

rnode

turn

A-C POWER

indicated

by

decreased, or the

be

decreased. The

Power

Supply.

should

be

CONTROL

determine

supply

ATE.

paragraphs (refer

terminals

should be

and connect a short

mode

of

operation.

SWITCH/CIRCUIT

the

front

VOLTAGE

Turn

"on")

to

the

voltage/current

is

now

Turn

"on").

front

panel

VIX

indicator

Turn

panel

"VI

CONTROL

ATE

is

A-C POWER

the required load

"crossover"

ready

for

operation.

to

par's.

3-1

A-C POWER
Observe the

(output

circuit

CURRENT

A-C POWER

X"

indicator),

now

ready

front

voltage) level.

to

the

should

go

BREAKER

setting rnust

for

operation.

SWITCH/

current

through

SWITCH/

panel

output

METER

"on"

to

SWITCH/

"on".

the load

be

3-31

OVERVOLTAGE

3-32 The overvoltage

SCR conducts across the

if

such overvoltages
the actual operating
The

LEVEL

adjusted very close the the opet·ating voltage (rninimurn threshold =

whichever
crowbar.

3-33 SETUP

1)

2)

3)

All

AND

Without
Turn

VOLTAGE
operating voltage).

Depress the

wise,

4)

Turn

DISABLE!

NOTE:This

NOTE:1)

NOTE:2)

3-6

last

adjustment

the voltage at
your

load can tolerate.

5)

To
TROL
CATOR

supply

Readjustment

equilibrium.

If
par. 3-21,rnust

CROWBAR, SETUP

crowbar

control

is

greater). The

operating

CHECK

connecting the load

A-C POWER

until

the

VOLTAGE

button.

which

check

the

circuit

power

occur.

voltage

can

be

controls

PROCEDURE

SWITCH/CIRCUIT

CONTROL

DISABLE

crowbar

CONTROL

established the

the

power

adjusted

clockwise. Observe

larnp energizes. Correct

an

output

exjct

!

voltage
of

the

crowbar

be

used.

AND

CHECK

protects the load frorn rnornentary

supply

The

settinCJ

of

the

set frorn 3 volts

operation

are accessible at the

to

button
INDICATOR

supply

crowbar

to

LEVEL

point

output,

of

power

of

to

the

the desired value

(and keep

slightly

"threshold"

will

trigger level, depress

front

panel

its operating value.

control

at a remote load must

and the A-C POWER

the

front

supply and the

to

110%

the

crowbar

power

supply

BREAKER

it

energizes (simulated

counterclockwise

i.e., the

"crowbar".

VOLTMETER

LEVEL

rnay

adjustment

be

panel

front

depressed)

LEVEL

lc.vel

of

the rated

circuit

panel (refer

turn

"on",

at

which the crowbar

For

required

be

control

at

which

can

be

LEVEL

observe the

while

crowbar

to

difference

minimum

DISARM

and

note

as

described above

after

established, remote error sensing,

or

long-term overvoltages. The

SWITCH/CIRCUIT

determines the

the

crowbar

output

voltage. The

2%

of

rated

checked without

to

FIG.

2-2, SECT ION

control

fully clockwise.

front

must

turning

the

action).

circuit

output

panel

trigger

LEVEL

LEVEL

actually

VOLTMETER,

BREAKER

"threshold"

will

voltage

II).

(NOT

control

crowbar

is

tripped

between

be

activated.

control

may

or

0.5

triggering the

and set

to

the actual

counterclock-

volt,

the actual operating voltage. Release the

voltage between the

"false

triggering"

push

button

the voltage at

if

load and

power

supply have reached thermal

and

output

use

the largest threshold

turn
which
necessary, Reduce

voltage

VOLTAGE

the

crowbar

as

described in

ATE

CON­INDI-

power

l/4-2078

be

and

3-34 INTRODUCTION TO REMOTE CONTROL OF THE ATE OUTPUT

3-35

GENERAL
panel)
VOLTAGE
with
voltages for
amplifiers,

ted across the (+)15

3-36 By disconnecting the internal

remote
VOLTAGE
or

simultaneously on all three programming channels, although individual programming

discussed

PROGRAMMING THE VOLTAGE CONTROL CHANNEL

3-3~

GENERAL.

3-3~

control

REAR
VOLTAGE
method
supply at least 1 rnA

PAR. 3-41, and illustrated in FIG. 3-6.
Since all terminals

3~

PROGRAMMING
fier

offsets

preamplifier, versus the various influence quantities, are specified

I

1-2).

I

3-4

Making

basic

AMPL
input
ATE
presented

are possible

(REFER TO

control,

the jumper connections on the

control

PROGRAMMING

can

principle

ir,put,

source does

preamplifiers

the

PROTECTOR

the

VOLTAGE

while

the

circuitry,

PROTECTOR crowbar I eve!,

in

the

following

The

ATE

mode,

can

COMPARISON

of

voltage

be

used

as

of

each

preamplifier

use

of

the

to

will

in

the

following

with

the

THE

VOLTAGE

of

OVERVOLTAGE

volt

supply.

the

pari:lgraphs.

output

be

remotely

CONNECTOR

control,

of

control

of

two

independent preamplifiers (PREAMP

CONNECTOR,

an

uncommitted

ATE

preamplifiers allows the user

keep in mind

program the

not

have

can

be

used

paragraph should suffice

ATE

power supply.

FOLD-OUT

CONTROL

the

ATE

and

CURRENT

control

ATE

VOLTAGE

voltage which

controlled

AMPL

with

the

control

current. An application, demonstrating this

output

can

be

is

that

ATE

the required amplitude,

to

adapt most

DRAWING

CHANNEL,

are

locally adjusted

REAR

zeroed

output

PROGRAMMING

CONTROL

PROTECTOR

sources at the

and

can

be

programmed externally.

is

controlled

by

disconnecting the internal

(PC-12)

reference to the

signal must

voltage

operational

with

a 0

to

10 volts, 1 rnA signal, presented at the

over its rated

input

AT

THE

the

CURRENT

by

means

CONNECTOR

CHANNELS

"crowbar

REAR

CURRENT

and substituting

be

control

amplifier
the

built-in

to

or

if
sources and provide the required parameters. The examples
to

outline

level"

PROGRAMMING

CONTROL

by a front

PROGRAMMING

a positive going

"A",

can

be

using the applicable transfer functions. The static

ZERO controls. The offset variations

accommodate a variety

output

the required

the wide variety

exercised

END OF

an

in

voltage range.

THIS

CONTROL

of

the1r respective

are created

is

adjusted

CHANNELS,

Control

panel

VOLTAGE

VOLTAGE

external

COMMON. For this

0-10

PREAMP

in

Section I

control

SECTION.

CHANNEL

as

shown. The internal control

by

their

by a potentiometer,

CONNECTOR and substituting

can

be

CONTROL

CONTROL

control

many

signal at the

volt

d-e voltage source, able

control

"B")

are available at the

other

of

this manual (Refer to Table

of

programming sources. The

VOLTAGE

If

the available programming

current cannot

of

programming circuits which

For

local

(front

and the OVER-

front

panel controls,

individual

as

well

exercised

will

be

method

ways. Each preampli-

COM PAR I

be

control

connec-

as

the OVER-

individually

illustrated and

in the Local

AMPL

at

input

of

"direct

is

drive"

described

REAR

for

supplied, the

SON

the
the

to

in

each

OUTPUT VOLTAGE CONTROL WITH AN

An

interesting example
voltage
example, responds

signal
for

the

control,

PROCEDURE

1) Connect the

2) With the

3)

AT!=:

1/4-207

by

means

of

the

ATE.

while

PRECISION

Vary

M1

on

SN-488

8

SN-488

Since the

the

(VOLTAGE

SN-488

the

, should vary

output

of

the

of

a Kepco Digital Programmer. The IEEE

to

digital

is

a voltage

SN-488

other

may

EXT.

CONTROL

VOLTMETER

at zero,

input

voltage

to

zero volts.

direct

input

data and

from

has

be

used

to

CONTROL

(M1)

turn

from

the

from

approximately

EXTERNAL

drive method

can

be

zero

to

10 volts

two

independent

control
WITH

VOLTAGE,

the

AN

to

the

ATE

SN-488

the

ATE

"on".

0-10

VOLT

of

voltage programming

488

addressed either

or

zero

outputs

ATE

output

current

EXTERNAL

(SN-488
as

shown in

from

zero

zero volts

0-10

DIGITAL

to

10 volts. The

to

its

D-C

CONTROL SIGNAL

is

the

bus compatible Kepco

by

a computer, or manually. The

to 1 volt

(A,B),

FIG.

maximum

and

constitutes the

only

one

output

(See

par. 3-60).

VOLT,

3-6.

1 rnA D-C

PROGRAMMER),

ATE

rated

control

output
output

of

the

ATE

output

SN-488

is

needed

CONTROL

the

voltage,
voltage. Return the

system

input

for

LOAD

as

output

program

voltage

SIGNAL)

and the

read-out

for

3-7

3-44

CALl

BRA

Tl

ON (Refer to Section

1)

Check

E0 ZERO

2) Set the
exact

3)

Set

the

Correct

4)

Set the A 1 E
procedure
remote

the

PRECISION

control.

MODEL

maximum

MODEL
with

the

tront

~liven

control

REMOVE
(41)-(42)

VOLTMETER

SN--488

rated

output

SN-488

ATE

E

ZERO

0

panel CUR R E N1

in

PAR. 3-28 \2,3

of

~he

output

JUMPER:

ON

PC-12

II,

FIG.

inpU1

voltage

output

current

2 1

fur

the location

(M1)

to

10 volts. Observe

by

means

to

"zero"

control

,4

PC-12

if

CO

NT

,5), or

as

described

II

31

51

71

91

Ill

Ill I

required.

cf

ai

I internal controls).

for

"zero"

of

again and check the previously calibrated zero

RO

use

reading and correct,

Ml

and calibrate the

the

SN-488

L according

one

of

the

in

PAR.'s 3-60

calibration

to

your

output

or

3-64.

if

necessary,

ATE

output

control.

load requirements,

current programming

Ml

DIGITAL

VOLTMETER

with

the

voltage

point

following

circuits

on

ATE

to

the

M1.

the

for

L-------~~----~

SN-488

KEPCO

(+)

DIGITAL-

PROGRAMMER

~~w~B>=======1r:-

ATE

1/4

RACK

FIG.

3-6

OUTPUT

3-45 VOLTAGE CONTROL WITH A TWO-TERMINAL RESISTANCE

346

As

mentioned previously (refer

used

to

control

the

external

the

preamplifier
channel.
and

the
from

control

As

seen

external

the preamp\

VOLTAGE

the

ATE

voltage channel. By means

potential

can

be

used

in

FIG. 3-7, the

input/feedback
ifier

output.

CONTROL

to

PAR.'s 3-39,

can

be

amp I

to

perform

INT.

components

WITH

AN

EXTERNAL

340) a wide

ified,

inverted

remote,

REFERENCE

are

calculated

{0-10V,

variety

of

one or
and/or

two-terminal

SOURCE

to

produce the required 0

r

~

_j33

summed

-f-Al!lfF:

'---R--......:........

ODD

~ODD

1 mA) D-C

of

both

of

the
with

resistance programming

(6.2V@

41

P4

CONTROL

external programming sources

ATE's

uncommitted

an

internal d-e signal.

1 rnA)

is

connected

I

II II

II

0 0 0

TO

AC

SOURCE

0 0

INPUT

·r

J-

SIGNAL.

preamp\ ifiers,

Alternately,

of

the

ATE

to

PREAMP

to

10

volts

control

Rr----t>

i

can

voltage

be

"A"

signal

TO

,\TE

DRIVER

CKT.

3-8

Fl,.

3-7

TWO-TERMINAL

USING PREAMP

RESISTANCE

"A"

AND

THE

PROGRAMMING

INTERNAL

REFERENCE

OF

THE

VOLTAGE

SOURCE.

CHANNEL,

ATE

1/4-2078

I

3l

I

(Refer

to

F I

c;.

which

(Ep,

Since

If

lb

0

to
and thereby
control
tance

potentiometer
REF. SOURCE
up

from a 8KS1

PROCEDURf=:,

1)

2)

3)

is

the

ratio

is

selected

10K

ohm

control

resistance

value, making

Connect the external components, the
shown

With

the

Vary
voltage,

Return the

3-7). The preamp I

made equal

EretiRr

to

reostat, decade or

is

available,

is

fixed,

VOLTAGE

in

FIG. 3-8.

EXT.

the

EXT.

as

to

rnay

be

1 rnA

the

ATE

is

not

available, the

use

of

a (nominal) 6.2

and a

CONTROL

VOLTAGE

VOLTAGE

read

out

EXT.

VOLTAGE

the

required

be

expressed

EP

for

example

output

the

preamplifier

the

control

2KS1

on

M1,

ifier

functions

= E

0

other

variable resistance

voltage

control

current

volt,

the external

trim

resistor

WITH A TWO-TERMINAL

CONTROL

CONTROL

should vary

CONTROL

here

control

(Preamplifier)=

voltage

where:

as a control

(Control

Currents frorn

from

current

output

(lb)

(lb

CAU.

LOAD

at

;ero

from

trom

to

its

;ero

in

the

inverting

"Ej")

current

1

Rf

0

will

to

its

(lb)

can

equation (Eq. 2).
must be. 10V/15KS1 = 0.66
Rr

must

and the PRECISION

ohms,

turn

zero ohrns

approximately

;ero

ohrn

configuration,

according

(EretiRr = lb),

(Eq. 2)

produce the required

maximum

be

be

the

position.

to

the equation:

Ext.

Preamp!
equal
voltage (

Eref Internal Reference Voltage
Rf

approximately

changed

6.2V/0.66

RESISTANCE

ATE

to

its

Ext.

(Voltage

Eq. 1

rated value.

to

accommodate the available resis-

If,

for

mA ~ 9.4KS1,

VOLTMETER

"on".

maximum

zero volts

producing its

Reference resistor

ifier

output

to

the required
Ej·)

Feedback Resistor

Control)

can

be

simplified

0.1

to 1 mA

0-10

example, a

mA.

resistance. The

to

its rated

can

volt

If a 0-1

15K

Since the

which

(M1)

output

voltage

voltage

control

to

be

selected), a

control

potential

OK

ohrn voltage

ohrn precision

built-in

can

be

to

the

ATE

ATE

output

maximum

6.2V

read:

INT.

rnade

as

value.

ATE

1/4-2078

FIG.

ON

PC-12:

AOD

JUMPER

(33)-(41)

REMOVE

(33)-(34),

3-8

JUMPERS:

CONNECTIONS

(41

)-(42)

FOR

VOLTAGE

CONTROL

TB
201

L-1-+------'--1

L-------4-+-----~0

I

r o o

DOD

~ooo

TO

(}

WITH A TWO-TERMINAL

RESISTANCE.

Ml

PRECISION

VOLTMETER

II

II II

0 0

AC

INPUT

I

3-9

3-50

CALIBRATION

1) Check the PRECISION

PREAMP

2) Set

EXT.

voltage

3)

4)

Set

EXT.

M1

and correct

Set the
procedure given
remote

as

described

5)

Operation
dynamic

supply

face and grounding (PAR.'s. 3-6

fast mode operation.

3-51

VOLTAGE CONTROL WITH A H!GH IMPEDANCE CONTROL SOURCE

3-52 External

using one
shown

control

of

the preamplifiers

in

FIG.

(Refer

"A"

VOLTAGE

to

the exact
VOLTAGE

ATE

control

in

can

stability

output

sources

3-9.

to

Section

II,

FIG.

2-1

VOLTMETER

ZERO

control.

CONTROL

r;~axirrurn

CONTROL

with

the PREAMP

front

p5;1ei

in

PAR. 3-28

of

the

output

to its rraxirnurn resistance. Observe

rated value

to

"A"

CURREr·JI

(2,3,4.~))

current

PAR. 3-31.

now

proceed. Check the

and

output

is

dynamically

ripple anrplitude. Refer
unstable \oscillations), review the paragraphs

through

which

cannot supply at least

in

the non-inverting

for

the location

(M1)

for

by

adJUSting

Lero ohms again, re-check the previously calibrated zero

ZERO

control

CONTROL

or

use

as

described

ATF

3-26). AdJust the E0 LAG

configuration.

of

a// internal

"Lero"

reading and correct,

the

EXT.

if

required.

accordinq

one

of

the

in

PAR.'s 3-60 or 3-64. Set the overvoltage

power supply

to

PAR. 3-6

lb

to

the

output

output,

controls).

M1

and calibrate the

CAL.

control.

LOAD

current

by

means

if

high ripple

requirements,

programming circuits

on

100J.1A

of

control

The

control

control

current

can

source

if

the

be

is

if

necessary,

ATE

fo!lowmg

of

an

oscilloscope,

is

present.

power

ATE:

If

supply/load

is

configured

best accommodated

connected

to

with

output

point

protector

the

power

inter-

the

ATE

the

on

the

for

for

for

by

as

3-53 (Refer

calculating the external resistors

to

FIG.

RI(EXT.)

,---------

1

PC-121

I

FIG.

3-9 USING PREAMP

3-9). The

preamplifier

R1

PART

OF:

22,24,26

POTENTIAL

(Rl,

+ R2

R2

PR,f~,MP

A

"A"

TO

GENERATE

FROM A HIGH

output

voltage ( Ep)

R2)

for

the required gain, using the equation:

3),

(Eq.

33

THE

IMPEDANCE

is

where

0-10V@

rna

de

1

mA

SOURCE.

equal

e·

I

R1, R2

CONTROL

to

the required drive voltage

Preamplifier
equal

Output

to

the required drive

voltage (Ei)

Available
E xterna

control

I feedback resistors.

Vcltage,

source.

"Ej"

TO

ATE

DRIVER

CKT.

by

3-54

It,

fm

example, a 0
R2) over R2 must equal
match

is

replaced

3-10

needed, i.e.,

by

a short

to

0.5

volt

control

10/0.5

= 20,

it a 0-10

circuit

volt

and the preamplifier operates

source

so

source

trat

is

available, the preamplifier gain, and therefore the ratio

R1, R2

is

can

available,

be 38KS1 and

but

cannot deliver 1 rnA

as

a voltage-follower.

2KS1

respectively.

of

control

If

only

current,

an

impedance

R1

ATe

l/4-2078

(R

can

1 +

be

PROCEDURE,

1)

Connect the external components,
shown

2)

With

the

3)

Vary

the

as

read

EXT.

ON

ADD

(33)-(41)
REMOVE JUMPERS:

(24)­(41)-(42)

VOLTAGE

in

FIG. 3-10.

EXT.

CONTROL

EXT.

out

on

CONTROL

PC-12:

JUMPER:

(35),

(33)-

CONTROL

CONTROL

M1,

should vary

SOURCE

(34

),

WITH A HIGH

the

LOAD

SOURCE at zero,

SOURCE

to

its zero position.

PC-12

31

51

71

Ill

131

from

from

approxir:~atelv

II

9J

IMPEDANCE

and the PRECISION

turn

the

ATE

"on".

zero

to

its 'Tlaximum

zero volts

CONTROL

VOLTMETER

output

to

its rated

SOURCE

level. The

maximum

(M1)

to

the

ATE

output

value. Return the

ATE

as

voltage,

FIG.

3-10

CALIBRATION

1)

Check the PRECISION

PREAMP

2)

Set

EXT.

tage

to

SOURCE.

3)

Set

EXT.

correct

4)

5)

with

Set

the
procedure given in PAR.
remote

as

described in PAR. 3-31.

Operation
dynamic
suppllf
face and grounding (PAR.'s

fast mode.

CONNECTIONS

(Refer

to

Section

"A"

ZERO

CONTROL

the exact

CONTROL

ATE

control

can

stability

output

maximum

the PREAMP

front

panel

of

the

now

and

is

dynarn ically unstable ( osci I lations) review the paragr·aphs on power supply /load inter-

FOR

VOLTAGE

II,

FIG.

VOLTMETER

control.

SOURCE

rated value

SOURCE

"A"

CURRENT

3-28

output

proceed. Check the

output

ripple

3-6

CONTROL

2-1

for

to

maximum

to

zero again, re-check the previously calibrated

ZERO

control

CONTROL

(2,3,4,5),

current

as

amplitude.

throllgh

L--------'

ODD

~ODD

rt

I

II

ooooo

·_

TO

AC

SOURCE

([;]~)-~(}

WITH A HIGH

the location

(Mi)

tor

"Lero"

output.

by

adjusting the Calibrating

if

required.

according

or

use

one

described

ATE

3-26).

in

PAR.'s 3-60 or 3-64.

power supply

Refer to PAR. 3-6

AdJUSt

IMPEDANCE

of

a// internal controls).

reading and correct,

Observe

of

the E0 LAG

the

M1

and calibrate the

to

the

LOAD

output

output,

if

control,

Control

current programming circuits

by

high ripple

INPUT

requirements,

Set

the overvoltage

means

if

the

II

II

INPUT

SOURCE.

if

necessary,

in the

;ero

of

an

is

present.

ATE

I

with

ATE

output

EXT.

CONTROL

point

on

following

protector

oscilloscope,

If

the power

is

configured

M1

the

vol-

and

the

for

for

for

ATE

l/4-2078

3-11

3-57

PROGRAMMING

3-58

GENERAL.
control

EXT.
volt
EXT.
external

RENT
SLIGHTLY

ing this

If

3-59

mitted
volt),

ing paragraphs.

THE

The ;';,TE

mode,

can

be

CURRENT

r.xternal

CURRENT

control

CONTROL

control

the available

preamplifiers may

or provide the correct

COMPARISON

control

COMPARISON

source.

St:TTING

HIGHER

method

prograrnmin~1

CURRENT

output
remotely

signal

IN

THAN

is

described in PAR. 3-60 and illustrated

be

CONTROL

current,

controlled

AMPL

with

reference

AMPL

ALL

CURRENT

OF

THE

THE

suwce dt!es

used

polarity.

CHANNEL

controlled

by

disconnecting the

at the

GEAR

to

the

is

used,

PROGRAMMING

ATE

ACTS AS A

REQUIRED

1101

11ave

to

scal8

t'1E

Typical t:Xdr''fJies

by a front

ATE

only

MAXIMUM

the required

programming source

panel

CURRENT

15V

bias

PROGRAMMING

COMMON

the small

"BACK-UP"

of

some pus:;ibie applications are provided in the

terminal. Since the non-inverting

amplifier

APPLICATIONS,

CURRENT

OUTPUT

CURRENT.

in

FIG.

amplitude

to

CONTROL

from

the non-invertincJ

CONNECTOR,

bias current must

THE

LIMIT
An

3-11.

or

polarity,

the required

rheostat in the local

and

applying

be

FRONT

AND

application,

one

of

the

control

potential

input

input

supplied

PANEL

MUST

demonstrat-

ATE's

of

a 0

to

of

by

CUR-

BE

SET

uncom-

(0

to

follow-

thr.

1
the
the

1

3-60 OUTPUT

3-61

An interesting example
SN-488
can
the
Since the

output

3-62 PROCEDURE

1)

2)

3)

CURRENT

Digital Programmer. The

be

addressed either

SN-488

SN-488

may

Connect
PRECISION

Note· The
the load
current
voltmeter
volt

loops.
With

Vary
M1,

to

zero volts.

CONTROL

of

by

is

a voltage

be

used

(OUTPUT

the

or,

measuring resistor (RM)· RM should

full

scale

the

SN-488

the

should vary

from

has

two

to

control

EXT.

VOLTMETER

output

as

indicated

can

be

reading.

input

voltage from the

from

REMOVE JUMPER:

(40)-(44)

WITH

AN

d1rect drive

a computer

zero

independent

the

CURRENT CONTROL

CONTROL

current

used, e.g.,

If

output

approximately

ON

111ethod

SN--488

to 1 volt

ATE

(M1)

value

in

FIG. ::l-11,

for

an

electronic

at zero,

PC-12

or

manually

outputs

output

VOLTAGE,

to

can

a 10 ampere

turn
SN-488

EXTERNAL

1s

tlw

control

responds

and constitutes

tr1e

be

zero volts

PC-12

12

14

16
Is

110

112

114

Lly

(A,

volteiCJC

WITH

(Model

ATE

as

measured

indirectly

voltmeter

the

ATEC

from

to

8)

(Sec

be

output

0 TO

1V

CONTROL

of

the

ATE

digital

input

signals,

means

uf

CJ

keyboard. The attenutated

th~C

input

and

onlv

une

par.

::J-!~1

).

AN

EXTERNAL

SN--4b8

shown

in F IC].

directly

by

selected such that a convenient range on the precision

current,

is

used,

"on".

zero

to 1 volt.

to

its

maximum

Digital Pro(Jrammer), the

311.

by

means

means

of

use a 0.1

it

should

SIGNAL

output

program

;s

needed

0-1

the precision

The

rated value. Return the

current

is

IEEE-488

for
for

VOLT,

of

a suitable ammeter

ohm,

be

batter-operated

ATE

output

by

the

ATE

current

D-C

CONTROL

voltmeter

resistor

current,

bus compatible and

means

of

a Kepco

output

signal

current channel.

control,

to

the

other

SIGNAL)

LOAD

and the

in

series

(M1) across a

produce a one

to

avoid ground

as

read-out on

SN-488

output

with

of

3-12

SN-488

KEPCO

DIGITAL-

PROGRAMMER

FIG.

3-11

CONTROL

0-1

v

(+)

CONNECTIONS

SIGNAL

FOR

ATE

OUTPUT

(KEPCO

1/4

SN-488

'T'

ODD

l-000

TO

ACINPUT

~1-:;l-)-------lrr

RACK

CURRENT

DIGITAL

CONTROL

PROGRAMMER).

WITH A 0-1

VOLT

~

ATE

1/4-2078

3-63

CALIBRATION

1)

Check

ZERO

2) Set
maximum

the
control.

the

(Refer

PRECISION

Model

rated

3) Set the Model
Correct

4) Set the
output

PAR's 3-37

with

.1\

TE

VOLTAGE

through

to

SN-488

output

SN-488

the

ATE

front

Section

II,

VOLTMETER

output

current

output

1

ZERO

0

panel

VOLTAGE

programming

3-56.

FIG.

2-1

to 1 volt.

by

means

to

"iero"

control

circuits

tor

the

(M1)

Observe

of

location

"zero"

the

of

reading and

M1

and calibrate the

SN-488

all internal

correct,

calibration

controls).

if

ATE

control.

necessary,

output

again and check the previously calibrated Lero

if

required.

CONTROL

for

according to

remote

control

your

load requirements,

of

the

output

VOLTAGE

with

current

or

as

the

ATE

to

the exact

point

on M1.

use

one

of

described in

1

the

0

OUTPUT CURRENT CONTROL

3-65

In

this

source,

external

control
to

mode, one

produce the 0

current

control.

L--------.1-<

FIG.

3-12

WITH A TWO-TERMINAL

of

the

to 1 volt

~-'------'J-

PC-12

PART OF:

TWO-TERMINAL

USING

THE

PREAMPL

ATE's

preamplifiers

control

siC]nal.

RESISTANCE

AND

RESISTANCE

is

used

in

conjunction

with

one

The external feedback resistor (Reel serves

+

- INT.

REF.

SOURCE

6.2

V @ I m A

PROGRAMMING

THE

INTERNAL

OF

THE

REFERENCE

CURRENT

SOUHCE.

CHANNEL

of

OF:

the

as

ATE's

the

two-terminal

reference

TO

CURRENT

SENSING

TO

DRIVER

CIRCUIT

ATE

1/4-2078

(Refer

voltage

to
(Ep,

FIG.

Ei=Ep=ErefxRf

Since the

ratio

(EretiRr = lb),

If

lb

is

selected

0

to

1 K

ohm,

and

thereby
control
tance

resistance

value, making

potentiometer

REF.

SOURCE is a

from

a 8KD.

3-12). The

which

is

made equal

Rr

EretiRr

may

Eq. 1 can

to

be 1 mA

rheostat, decade

control

is

the

not

use

is

available, the

(nominal)

fixed,

and a 2KD.

preamplifier

to

(Eq.1),

be

expressed

be

simplified

for

or

ATE

output

available,

of

the

control

6.2
trim

functions

the required voltage

where·

as a control

to

read

Ei

= Ep =

example

preamplifier

(control

other

variable resistance

current

the

control

from

current

output

current

volt,

the external Rr

resistor

(lb

CAL.).

here in the inverting

"Ei")

according

current:

lbRf

(Eq. 2)

current

(lb)

from

zero

to

(lb)

equation

must be

must

approximately

will

produce

its

maximum

can

be
(Eq. 2).
1V/1.5KD. = 0.66

be:

6.2V/0.66

to

Eref
Rcc

the required

changed

If,

configuration,

the

equation:

Ext.
Preamp

equal

producing

Reference resistor

I

ifier

output

voltage

to

the required drive

voltage (Ei)

Internal Reference Voltage
Ext.

Feedback Resistor

(Current

rated value.

to

accommodate the available resis-

tor

example, a 1.5K

mA

"'='9.4KD.

0.1

Control)

to 1 mA

0-1

volt

If a 0-1 K ohm

mA.

Since the

which

can

be

control

ohm

can

built-in

its

output

6.2V

selected), a

potential

voltage

precision

INT.

be

made

up

3-13

3-68

PROCEDURE,

1)

Connect the external components, the
shown
ammeter
voltmeter

range on

to

~

2)

With

3)

Vary
current,

EXT.

ATE

OUTPUT

in

FIG.

3-13.

in

series

(M1) across a current

thle

precision

produce one

::Jund

loops.

the

EXT.

CURRENT CONTROL

the

EXT.

as

read

CURF{ENT

ON

PC

12:

ADD

JUMPER:

(29)-(44)

REMOVE JUMPERS:

(29)-

(30).

(40)-(44)

NOTE:

with

volt

full scale.

CURRENT

out

on

CONTROL

CURRENT

The

the load or,

voltmeter

CONTROL

M1,

should vary

to

PC-12

131
151

CONTROL

output

as
measuri11g
can

be

If

an

electronic

its

;ero

II

31
51

71

91

Ill

WITH A TWO-TERMINAL

LOAD

and the PRECISION

current value

indicated

resistor

used, e.g.,

at

;ero

ohms,

from

;ero

from

ohm

position.

can

in

FIG.

(RM)·

RM should

for

a 10 ampere

voltmeter

tum

ohms

is

the

to

approximately

RESISTANCE.

VOLTMETER

be

measured

3-13,

used,

ATE

its

;ero

maximum

directly

indirectly

be

selected such

output

current,

it

should

"on".

to

its

be

resistance. The

maximum

~~1----11

(M1)

by

by

means

use a 0.1

battery

Ml

PRECIS

VOLTMETER

II

II

means

ION

II

00000

to

the

ATE

as

of

a suitable

of

the precision

that

a convenient

ohm resistor

operated

ATE

to

avoid

output

value. Return the

I

3-69

CALIBRATION

1)

Check the PRECISION
PREAMP

2)

Set

EXT.

current

3)

4)

5)

Set

EXT.

M1

and correct

Set the
the

output

Operation
stability
output

grounding PAR's 3-5

ATE

1/4

FIG.

3-13

(Fiefer

CONNECTIONS

to

Section

A

TWO-TERMINAL

II,

FIG.

VOLTMETER

"B"

ZERO

CONTROL.

CURRENT

to

the exact

CURRENT

ATE

front

maximum

with

the PREAMP

panel

CONTROL

rated value

CONTROL

VOLTAGE

Voltage programming circuits

can

now

proceed. Check the

and

output

is

dynamically

ripple

amplitudE~.

unstable (oscillations), review the paragraphs

through

3-26).

1'

ODD

1-DDD

<€[l!]i-7oL--)

RACK

FOR

ATE

OUTPUT

RESISTANCE.

2-1

for

the location

(M1)

tor

to

its

maximum

by

adjusting the

to

Lero ohms again, re-check the previously calibrawd

"B"

ZERO

control

CONTR

Refer

0 L according

for

remote

output,

to

------l(}OURCE

CURRENT

ota//

"Lero"

CONTROL

internal controls).

reading and correct,

resistance. Observe

EXT.

if

required.

to

control

by

means

PAR. 3-6

as

of

if

high ripple

lb

CAL.

the

described

an

oscilloscope across

TO

AC

WITH

M1

and calibrate the

control.

LOAD

requirements,

in

PAR's 3-37 through 3-56.

is

present.

on

power

INPUT

supply/load interface and

if

necessary,

ATE

;ero

or

RM·

for

If

the power supply

with

output

point

use

one

dynamic

the

on

of

3-14

ATE

1/4-2078

3-70 PROGRAMMING THE OVERVOLTAGE PROTECTOR

3-71 The

3-72 REMOTE CROWBAR LEVEL CONTROL WITH AN

3-73 The

ATE

overvoltage

(SET

LEVEL).

be

independently remotely controlled

SET

LEVEL

at

the
"tracking
overvoltage
Typical examples

ATE
example
signals and
0

to 1 volt

control

OVEF~VOL

mode",

protector,

crowbar level

of

such a control

can

per channel and

protector

This local operating mode

completely counterclockwise and applying

TAGE

i.e., the

of

be

controlled by

INPUT.

0-10

so

that

these programming applications are presented

can

be

source

serves

"crowbar

volt

the crowbar level

level"

is

normally

has

been

previously described in PAR. 3-31. The crowbar level

by

setting the internal crowbar level

In another programming mode, the crowbar level

output

voltage programming signal

automatically

EXTERNAL

remotely controlled

is

the Kepco

computer

as

the

or

input

by

an

SN-488

manually. The

to

the

ATE

3-74 PROCEDURE, CROWBAR LEVEL CONTROL WITH AN

1)

Turn

front

2)

3)

4)

5)

6)

7)

CROWBAR SET

Connect a substitute
the

EXT.

CONTROL

Turn

the

ATE

"on"

the

level at which the

NOTE:

connect a precision
Slowlv

crowbar
Turn

circuit
Test the previously

counterclockwise and observing the voltmeter.
level, correct the setting
one

Turn
requires.

Monitor

reduce the level

level.

the

breaker.

turn

counterclockwise, re-activate the

the

the power supply voltage either

voltmeter across the load.

ATE

front

set

ATE

front

LEVEL

LOAD

and the

SOURCE

and adjust the

ATE

is

to

of

the

panel

VOLTAGE

crowbar level again by turning the

of

the

panel

VOLTAGE

completely counterclockwise.

EXT.

CONTROL

to

its

shut

EXT.

EXT.

maximum

front

down,

CONTROL

CONTROL

CONTROL

value.

panel

VOLTAGE

not

to

SOURCE and note

If

ATE

circuit

CONTROL

set

by a

front

panel (screwdriver adjusted)

to

zero,

turning

an

external

"tracks"

in

the

following

(0-10

external 0

Digital Programmer, which responds

output

overvoltage

EXTERNAL

your

by

means

one

the

ATE

SOURCE,

breaker

to

to

10

of

the

protector.

SIGNAL

SOURCE

load voltage level.

turn

the exact operating voltage which the

to

CONTROL

of

the

counterclockwise and re-activate the

front

does

not

turn

and

control

can

simultaneously

the

output

paragraphs.

VOLT

D-C, 1

volt,

1 rnA d-e

SN-488

the

ATE

to

the desired crowbar/eve/, i.e.,

front

panel meter, or

if

the

ATE

panel

VOLTAGE

shut

down

front

panel

test again.

signal (0

can

voltage level

rnA)

is

from

as

shown

shuts

at the intended crowbar

VOLTAGE

the

front

to 1 OV

be

controlled in a

be

applied

of

SIGNAL

control

down

source. One

to

digital

zero

to

10 volts

in

FIG.

if

at the correct

CONTROL

CONTROL.

control

can

panel

d-e)

to

the

the

ATE.

input

or

3-14.

Set

required,

ATE

slowly

LOAD

ATE

1/4-2078

ON

PC

12:

REMOVE JUMPER:

(26)-

(36)

FIG.

3-14

PC-12

12

14

I&
IB

Ito

112

114

I~

REMOTE

(0-10V

~f-7.L-)

CROWBAR

D-C@ 1 rnA)

.__-++---11

'-------t--+-1'::-r---1

----1(}

LEVEL

CONTROL

SIGNAL

WITH

SOURCE.

DOD

1-DDD

AN

EXTERNAL

Ml

PRECISION

VOLTMETER

II II

0 0 0 0 0

TO

AC

INPUT

II

I

3-15

3-75 AUTOMATIC (TRACKING) CONTROL OF THE CROWBAR LEVEL

3-76

In

thrs application, an ATE's voltage

which

rs

c,,;:Jultaneously applied as a

.1ow

progrnmmed

levei

is

"tracking"

thus provrding

by the external

the

output

automatic

overvoltage

output

programming

voltage, i

is

remotely

control

sigrJa! to the

source

e,

it always remains higher than the instantaneous ATE

protection

controlled

throughout

throughout

by a 0-10 volt external

overvoltage

the

the range.

protector.

specified

As the ATE

range of the ATE, the

3-77 PROCEDURE, AUTOMATIC (TRACKING) CONTROL OF THE CROWBAR LEVEL, (ATE

1)

Connect
switch

2)

Connett

J) To test the overvoltage

PROGfRAMMING SOURCE to a nominal value.
tor
breaker

4)

Remove

the ATE
set front panel
that is, the

jumpers

on the REAR PROGRAMMING CONN ECTOR as indicated

(S1) as shown. Turn front pane!

a substitute LOAD and the

protector

willicrowbar

the ATE output.

will trip.

S1,

and

connect a jumper

circuit

breaker

and

CROWBAR LEVEL

ON

PC-12:

ADD

JUMPER.

(36)-(49)

REMOVE

(26)-t(36)

difference

JUMPERS:(24H50),

AND

(41)-(42)

'

....

/

voltage

EXT.

action, turn ATE

Tile

CROWBAR

between

commence

control

between

PC-12

12

II

14

31

16

51

IB 71

!IO

91

112

Ill

114

131

116

151

118

171

t'2oi9'+

t'iz

211

t'24

z3+=1

CROWBAF1

PROGRi\MMING

operation. Should

Switch

indicator

(41

)-(50) of

LEVEl_

"on"

S1

control

SOURCE as shown

and set

from
will be

PC-

12.

erratic

slrghtly clockwise. This will

the

crowbar

level and the operating voltage.

fully

counterclockwise.

output

voltage by

position A to

"on"

momentarily

Connect

the

triggering

increase

programming

output

voltage is

crowbar

output

voltage,

IN

"SLOW"

in

FIG. 3-15 and

in

FIG. 3-15.

B.

The overvoltage protec-

means

MODE)!1J

connect

of the

and the ATE

actual

LOAD,

reactivate

occur

in

actual

operation,

the

"threshold"

voltage;

signal

EXT.

circuit

0-IOV

PROGRAMMING (

SOURCE

!-!(_-.!...)

+--+-...J

B~CLOSED

~SI

A

FIG.

3·15

(1)

If

the

1)

Do

2)

Do not

All

OUTPUT

other

ATE

lis

operated in the

not

&dd

r~move

descriptions

CONNECTIONS
VOLTAGE

jumper

jumper

OPEN

AND

(36)-(49)

(24)-(50)

are

applicable

~

ATE

FOR

SIMULTANEOUSLY

THE

CROWBAR

"FAST"

mode, the

for

~!-+--)

1/4

RACK

LEVEL

3)

Connect

4)

In

parragraph, 3-77 Step

both,

"FAST"

PROGRAMMING

(AUTOMATIC

following

51-Common and 100K

connections

and

"SLOW"

DOD

t-ODD

----i(}OURCE

THE

TRACKING).

to

PC-12

to

4,

connect

operating

ATE

pin

r

must

36

pins

mode.

TO

ACINPUT

be changed:

(36)

and

(41)

3-16

3-78 PROGRAMMING THE OUTPUT

VOLTAGE

MEANSOFEXTERNAL,REMOTECONTROLVOLTAGES

3-79 The

TO

output
means
current channels over the rated
for

the Current Channel. An ideal programming source

which provides

NOTE.

IEEE488

voltage,

of

remotely located variable voltage sources. The

FOR
FIERS
THE

BUS

and

two

independent

CONTROL

MAY

BE

AVAILABLE

REMOVE JUMPERS:

(40)-(44)AND

ON

the

output

SOURCES

output

control

current

range

voltages

NOT

USED, AS DESCRIBED IN PAR.'S 3-45 TO 3-56

CONTROL

PC-12

VOLTAGE

(41)-(42)

AND

of

the

are

0 to 10

of

WITHIN

THE OUTPUT CURRENT

ATE

power supply

control

volt

at 1

is

the Kepco

can
voltages required
mA

for

the Voltage Channel

SN-488

SIMULTANEOUSLY

be

controlled simultaneously by

to

drive the voltage

Digital Programming System,

the correct magnitude per programming card.

THE

UP

GIVEN

OR

SPECIFICATIONS, THE TWO PREAMPLI-

AND

3-64 TO 3-69, TO SCALE

DOWN AS

REQUIRED.

VOLTS

I

II II

0 0 0

VOLTS(M2)

I

II

II

II

I

~~

0 0 0

BY

and

and 0 to 1 volt

(MI)

II

11----,

(+)

(-)

KEPCO

MODEL
SNR-488-4
INTERFACE

VOLTAGE
CONTROL

SIGNAL

KEPCO

M 0

DEL

c..::C:..:O;,:.:;Mc:....

SN488-B/D

PROGRAMMING

CARD

~------__.coNTROL

FIG. 3-16

CONNECTIONS

VARIABLE

'

OUTPUT

B

CURRENT

SIGNAL

CONTROL

---+-....1

FOR

CONTROL

VOLTAGES,

PC-12

ATE

II

31

51

71

91

Ill

131

1/4

RACK

OF

OUTPUT

SUPPLIED

1

DOD

~ODD

([i]~)>

----~rr

TO

ACINPUT

~

VOLTAGE

BY

THE

AND

KEPCO

OUTPUT

SN-488

CURRENT

DIGITAL

BY

PROGRAMMING

MEANS

OF

EXTERNAL,

SYSTEM.

ATE

l/4-2078

3-17

3-80 PROCEDURE, OUTPUT CONTROL WITH

SN-488
STEP

STEP

STEP

STEP 4: Open S1.

3-81

CALIBRATION,

(Refer
(Refer

1)

21

3)

4) This

1: Connect external

FIG. 3-16.

2:

With

the

VOLTAGE

CONTROL

3:

Close S1.
supply
output

output
voltage.

output
current.

Vary

voltage,

VOLTAGE CHANNEL

to

Section

to

your

Open S1.

"zero"

Set
output

full-scale cal.
Set

and correct

approximajtely

II,

SN-488

Set

reading and correct,

VOLTAGE

vo11tage

VOLTAGE

concl1udes the calibration

compom~nts,

CONTROL

SIGNAL

Vary

FIG.

control).

with

(Channel

the

CURRENT

current,

Leave

CURRENT

the

VOLTAGE

as

read-out on

2-1

for

system manual

VOLTAGE

CONTROL

to

the exact

CONTROL

the power supply

1/3

its n1axirnum setting.

as

read-out on

the

lo:.:

CONTROL

if

necessary,

SIGNAL

maximum

SIGNAL

the LO.L\D, the PRECISION

Blat

CONTROL

M1,

for

of

EXTERNAL

SIGNAL

Lero,

CONTROL

M2,

CONTROL

should vary

--.,-,fall internal power supply controls).

the location

SIGNAL

with

to

its

rated value

to

Lero again, re-check the previously calibrated zero

"E0 ZERO"

the voltage channel.

CONTROL VOLTAGES, SUPPLIED BY THE KEPCO

VOLTMETERS

(Channel

turn

power supply

SIGNAL

should vary

SIGNAL

SIGNAL

of

the

maximum

A)

at some

from

from

at its

from

from

approximately

the system calibration controls).

to

zero. Check the PRECISION

"E0 ZERO"

value. Observe

by

adjusting

control

if

required.

Leave

non-;ero

"on".

zero

to

its

approximately

maximum

its

initial

control.

che

the

setting.

setting

;ero

M1

external

VOLTAGE

maximum

to

and calibrate the

and the RM

value and the

value. The power

zero

to

the rated

to

its

maximum

the rated

control

maximum

VOLTMETER

voltage (Channel

CONTROL

as

shown

CURRENT

maximum

value. The

output

(M1 I for

power

supply

point

on

SIGNAL

in

A,

M1

at

3-82

CALIBRATION,

Note:

or,

resistor

for

used,

1)

2) Set

3)

'.:-S3

Operation
ripple

(osci

3-18

CURRENT CHANNEL

The

output

as

indicated

(RM)·

one ampere

it

should

Close S1. Set
"zero"

outpt..:t cuiTrent
full-scale cal.

Set CURR;ENT

and

can

amplitude.

I lations) review the paragraphs on power supply /load interface and grounding (PAR's 3-6 through 3-26).

current value

in

FIG. 3-16,

RM should

output

current,

be

battery-operated

CURRENT

reading and correct,

CURRENT CONTROL

to

control).

correc~

with

now

proceed. Check the

Refer

to

can

indirectly

be

selected such

use a 0.1

the exact

CONTROL

the power supply

PAR. 3-6

be

measured

by

means

that

a convenient range on the precision

ohm

resistor

to

avoid ground loops.

CONTROL

if

necessary,

SIGNAL

maximum

SIGNAL

if

high ripple

SIGNAL

to

to

"10 ZERO"

output,

its

rated value

zero again, re-check the previously calibrated zero

by

directly

of

the precision

to

with

the

maximum

means

is

present.

by

means

of

a suitable ammeter in series

voltmeter

produce

to

power

control

100mV

zero. Check the PRECISION

supply

value. Observe M2 and calibrate the power supply

by

adjusting the external

if

required. Open S1.

of

an

oscilloscope,

If

the power supply

(M1) across a current measuring

full

scale.

"10 Z E R

for

voltmeter

If

an

0"

control.

control

dynamic

output

can

electronic

VOLTMETER

voltage (Channel B,

stability

is

dynamically

with

the load

be

used, e.g.,

voltmeter

(M2)

pomt

on M2

and

output

unstable

ATEl/4-2078

is

for

3-84 THE USE

3-85 The

3-86 The design

output

INT.

CURRENT

SIMPLIFIED

available, via the

amplifier
both

inputs
CONNECTOR
feedback

the (open loop) gain

Since
tion

with

requires constant

is

back
Control"

sup

Note: Depending

might be advisable.

OF

THE

"EXT.

CURRENT COMPARISON

of

the

ATE

power supply

COMPARISON

SCHEMATIC

EXT.

has

previously been shown in

of

the

EXT.

(PC-12),

from

such divers physical phenomena

an

appropriate external

of

the required external

illumination,

pi

ied

by a photo

is

required

upon

DIAGRAM

CURRENT

CURRENT

it

can

of

cell, the

to

adjust various

the

characterisitics

be

this

control

supplied

is

normally

AMPLIFIER,

(See

end

COMPARISON

an

application

COMPARISON

used

adavantageously

third

control

are required.

circuitry

output

illumination

by

is

a lamp,

of

of

both,

AMPLIFIER"

controlled

depending on the prevailing operating mode. A glance at the

of

Section

AMPLIFIER,

as

light, temperature, pressure, chemical reactions and the like.

channel

shown

which

which

levels.

either

Ill),

for

external current

AMPLIFIER

to

is

very high,

by

means

is

connected at the power supply

is

0-1

OOmV, depending on the I ight

lamp and photo-cell, fast mode

FOR GENERAL FEEDBACK CONTROL

by

the

VOLTAGE

however, shows

which

is

normally
control

are available at the

control

the power supply

only

of

the

following

minute

COM PAR I SON,

that a third

"biased

(See

feedback signals

example: A

operation

control

off".

par.'s 3-57

REAR

PROGRAMMING

output

output.

input.

of

or

by the

channel

The

use

of

to

3-63. Since

in

response

in

combina-

"targer"

A "Brightness

the

object

The feed-

ATE

this

is

to

------29

r--------

1

I

I PREAMP "a"

3o

I

I

I

I INT.

I I SOURCE

1 L

__

s.2~@~mA_T

I

L__

L---------

__

PART

FIG.

OF

3-17

REF.

+

-=-

__

J37-

PC-12

ILLUMINATION

46-----

NOTE: DEPENDING

LAMP
OPERATE

CONTROL

CIRCUIT

FROM

VOLTAGE

CHANNEL

FROM

CURRENT

CHANNEL

___

UPON

LOAD AND PHOTO

CHARACTERISTICS OF

BETTER

WITH

IN

THE

FAST

ATE

_j

CELL,

THE ATE MAY

MODE.

ATE

POWER SUPPLY.

(-)

(+)

BOTH,

OUTPUT

3-87 (Refer

the

control
saurce
able in the

a fixed external source

3-88 In

ATE

the example, the

0-100mV),

AMPLIFIER.

control

1/4-2078

to

FIG.

3-17). Assuming the

circuit

can

be

connected

range

from 0 to 1 OOmV

which

The external reference resistor

signal, similar

ATE

power supply

may

be

designed

as

indicated

is

used

ATE

internal preamplifier

is

compared

to

the example described in a previous application

tor

a constant

with

as

shown

with

with

the dashed lines

if

illumination

illumination

the photo-cell

(Rrl

is

compatible

one

of

the

control

level.

(PREAMPL

output
and the

with

the requirements

ATE

preamplifiers, or,

in

FIG. 3-17. The external source should

is

desired, or

"B")

at the

control

it

should

is

used

to

input

to

the

rheostat (Reel are selected

(See

par. 3-64).

an

external

have

a means

develop the

EXT.

CURRENT

of

the lamp load,

control

of

calibration

control

signal (Ei =

COMPARISON

to

produce the

voltage

be

adjust-

if

3-19

FIG.

ON

REMOVE JUMPERS:

(29)-(30),(40)-(44)
(38H46

ADD

(29)-(44).

3-18

CONNECTIONS

PC

12:

JUMPER:

l.

I

BRIGHTNEss!

FOR

AND

Rcc

IOO.!l.

ILLUMINATION

CONTROL,

OUTPUT

r

DOD

c-000

TO

AC

SOURCE

INPUT

~=======::i(}

USING

THE

EXT.

CURRENT

COMPARISON

AMPL.

3-89 PROCEDURE,

1)

Connect the external
Adjust

2)
values required
channel are
lamp requirements serve

photo-cell

3)

Turn
Vary
brightne1ss should vary

3-90

CALIBRATION

Turn

the

control

3-91

MULTIPLE

3-92 In applications where several

malfunction
where all system
controller.
circuit
connections in a
shown in
include

until

connections are terminated at the rear

as

ILLUMINATION

both,

ATE

not

be

lost.

the external
the

BRIGHTNESS

BRIGHTNESS

the

maximum

POWER

on! a single

ATEi

FIG.

many

SUPPLY AND SYSTEMS OPERATION

power

power

multi-unit

;3-19.

Although

ATE

power supplies

front

by

the

in

control

BRIGHTNESS

CONTROL

supply

supplies

supplies are ideally suited

CONTROL

components

panel

LAMP

as a "back-up"

CONTROL

from

desired brightness

power

forces its

application

only

to

VOLTAGE

which

in this

application,

CONTROL

Lero (dark)

(Rcc)

supplies are

shut-down.

can

be

shut-down

can

three

as

are required.

ATE

the

ATE

power supply

and

CURRENT

represents the

the

setting

voltage and

to

its mid-range and

through

to

its

is

be

its range and observe its

to

the

approximate

maximum

measured.

used

it

is

often

Sometimes, a

with

a single manual switch

for

mult-unit

PROGRAMMING

externally

power supplies are shown, the

wired

CONTROLS

power

supply load.

of

current

maximum

clockwise

necessary

poeration since all necessary

CONNECTOR

to

as

shown in

the

front

limit

position

"PANIC

form

FIG.

3-18.

approximately

Although

panel

output

should feedback

turn

the

ATE

effect

on the

brightness.

and adjust the external

to

shut

down

BUTTON"

or a common

(PC-12).

a closed loop

control

fault-detection

loop

10% beyond the

the voltage

controls

power supply

all power supplies

arrangement

The

may

control

LAMP.

signal

crowbar

crowbar

be

or

close

from

The lamp

lb

is

circuit

extended

current

to

the
the

"on".

CAL.

if

desired,

fr•-Jm
control
control

ilS

to

a

a

3-20

ATE

l/4-2078

"PANIC"

BUTTON

REFER

TO

PAR

3-11

AND

FIG.3-31

TO

MODE

ATE

POWER

SUPPLY

NO. I

3-93 In

3-94 SERIES

3-95 Kepco

addition

to

the crowbar terminals,

NECTOR (PC-12)
operating mode

of

CONNECTION

ATE

power supplies may

ATE

units

is

described here,

Two

basic methods
configuration.
supply
power supplies

The choice between these

control

is

is

of
each

desired, the

to

method, some general rules should

1)

Series- connect supplies only up
the

ATE

power supply.

2) Series

3)

4)

- connect supplies only

the

same

load current.

Use

error-sensing,

NOTE

MODE

SENSING

OPERATION

The load-wires should
wire

pair

tightly.

FIG.

3-19

MULTIPLE

each

ATE

power supply. These signals may

ATE

power supply

OF

ATE

POWER SUPPLIES

be

but

several units, up

of

series connection are

"Automatic"

be

controlled

simultaneously, the

be

if

as

shown in the diagram

LEADS

ARE

EXCLUSIVELY.

be

as

short

Approximate

ATE

POWER

SUPPLY

N0.2

POWER SUPPLY

optically

isolated flag signals are available at the

(See

FIG. 3-19).

connected in series

to

commonly

two

methods

FAULT

for

an

output

used

will

depend on the

increased voltage

voltage total

The

series connection should be used.

"MASTER/SLAVE"

remembered:

to a total

they

NOT

as

equal lengths

of

500

volts

output

have similar current rating

(See

FIG.

3-20),

REQUIRED

IF

practicable. Select the load-wires

of

load-wire between each pair

DETECTION

be

used

to

"AUTOMATIC"

application

voltage,

or,

if

to

compensate

THE

APPLICATION

ATE

POWER

SUPPLY

NO.3

LOOP

PROGRAMMING

indicate the crowbar status and the

output.

of

500

If

method

this

the

current

as

heavy aspossible and

Series connection

volts may

and the

at hand.

the

output

is

is

the isolation voltage

be

"MASTER/SLAVE"

If

of

the interconnected

recommended.

control

for

load-wire drops.

CALLS

of

supplies

of

inter-connected.

individual power

For

limit

can

be

adjusted

FOR

CURRENT

twist

the load-

is

recommended.

CON-

two

either

for

to

ATE

Use

the

5)

6)

All

Fault

previously described programming

series connected system.

1/4-2078

Detection

Loop,

as

described

in

circuits

par. 3-91.

may

be

used

on the

MASTER

power supply,

to

program the

3-21

3-96

PROCEDURE,

1)

Without
on each supply

load).

2)

Adjust
power
supply.

a-c

3) Make all load connections

4)

Turn
should
(VOLTAGE

5) On those supplies
VOLTAGE

6)

If

that

in

Operation can

AUTOMATIC

connecting the

the

"off"_

Turn

power

a-c

power

be

current

the

CURRENT

the

voltage mode

SERIES

to

the required level (the sum

current

"off".

identical on all series connected supplies and all s:tpplics should operate in the voltage mode

MODE

mode

control

Connect a short

a-c·

power

Remove shorting wires

"on".

Observe

MODE

indicator

not

operating in the voltage mode,

indicator

operation

MODE

of

operation).

now

proceed.

CONNECTION

power

supplies

on each

circuit

"on"

and adjust each

as

shown in the diagram (refer to

output

"on").

energiLes.

is

desired

indicator

to

the load,

of

power

supply

consisting

metering and fror1t

turn

is

of

ATE

from

output

one

front

just energizing (the n;maining supply (supplies) should remain

turn

the

output

to

a short

Curwrlt

terminals.

turn

panel

a-c

power·

voltages

its extreme

wire

across the

Control

F"

I C. 3-20).

pa•1cl

MODE

current

current

"on",

and

adJUSt

will

be

the voltage applied

counterclockwise

otrtput

to

the required load

indicators. The

control

control

slightly

slightly

the

output

position.

terminals

counterclockwise

of

each

current.

output

clockwise

voltage

to

Turn

power

Turn

current

until

the

a-c

the

such

FIG. 3-20

SERIES

AUTOMATIC

CONNECTION

ON,PCI2:

REMOVE 1 JUMPERS:

(23)-(2!5)

ALL

UNITS

ON

I

PC-12

12
14
16
18
Ito

2

14

H:

116
118

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271

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14
16
18
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118

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LEADS

L

0

A

D

3-22

ATE

1/4-2078

3-97

MASTER/SLAVE

the
supplies

3-98 As

is
from

supply.

series

connection

"follow"

seen

from

disconnected

the

output

SERIES

is

the

output

the diagram

from

the

voltage

OPERATION.

controlled

voltage

(FIG.

3-21) in each

output

of

the

of

MASTER

from

o~

the

the

In

this mode

a common

"Master".

SLAVE

VOLTAGE

supply

of

operation the

"Master"

supply, the

CONTR 0 L

(E0m) and applied via a coupling resistor

supply,

input

amplifier

total

while

to

and

output

the voltage

the

VOLTAGE
an

external drive signal

voltage

output

of

all supplies

of

the

COMPARISON AMP

is

(Rt)·

to

the

in

"Slave"

derived

SLAVE

DRIVE

SIGNAL

3-99 The

input

1

mA.

r

Eom

(Ei.)

1

FIG.

output

voltage

signal

Since the null

Rt

'VVV

3-21

to

its

41

<

I

I

I

24

<

I

DEVELOPING

ATE

POWER SUPPLIES

of

each

SLAVE

VOLTAGE

junction

voltage (E) equals

-

Ib=O-ImA

-

THE

DRIVE

FOR

THE

WITH

supply

COMPARISON AMP (Ei)

(E0s)

;ero

MASTER/SLAVE

RATED

will

at balance,

OUTPUT

be

from 0 to

is

proportioned

Rf (int.)

COMMON

SERIES

VOLTAGE>

its

maximum

to

-

..

GATE

PART

OF

SLAVE SUPPLY

ATE

-

CONNECTION,
6V.

rated

output

produce a control current

voltage

I

I

I

if

(lb)

the

of

or, Rt =

Since lb =

For example,

planned
resistor

Let E0m = 0-55V (MASTER SUPPLY), then the
MASTER

R

t 1mA

ATE

1/4-2078

=

is

55V

for

selected

supply

lmA,

Ri =

lOK

if a series

an

application requiring a voltage supply

as

follows

is

varied over its

-lOK = 45K

Eom-

ohm

in all

connection

ohms, and connecting the system

lbRi

lb

ATE

of

output

power supplies, Rt (K

two

ATE

supplies

from

SLAVE

voltage range. Calculating the coupling resistor.

ohms=

with

maximum

0 to

SUPPLY

as

shown

Eorr1 -lOK

lmA

output

91

volts

(E0s)

rnust vary frorn zero to 36 volts,

in

FIG. 3-22

voltage

into

a common load, the coupling

will

of

36

and

55 volts

as

the

produce the desired result.

3-23

is

3-100

PROCEDURE,

1) Connect

2)

3)

4)

5)

6)

7)

FIG.
SERIES
POWER SUPPLIES
GREATER
VOLTAGE

MASTER/SLAVE

each

individual

front

panel Current

ting

of

a short

Turn

a-c

a-c

power

Interconnect

be

added.

Turn

a-c

be

should
Slowly,

load voltage
output

voltage meter.

Set

the
terclockwise,
then

turn

If

current mode operation

CURRENT

ter"

supply,

and deliver additional compliance voltage

REMOVE

(23)-(25)

3-22

MASTER!SLAVE

CONNECTION,

THAN
ONLY)

wire

power

"off",

power supplies

Turn

power

"on"

turn

MASTER

is

OLJJtput

until

each

slightly

MODE

the

JUMPER:

I

ATE

(WITH

6V

OUTPUT

"on"

remove short

MASTER
"on".

and all

the sum

current

each

"Slave"

SERIES

ATE

power supply,

Control

length across the

indicator

on

each

and adjust

circuit.

as

shown

supply

Observe

front

voltage

of

All

limit

supply just transfers

clockwise again,

supply

I

r----

-

front

[Janel

control

the

MASTER

output

current meters should

point

is

desired,

is

energi;ed. While the

will

PC-12

12

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14

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output

each

ATE

in

FIG. 3-22

VOLTAGE

panel

mPters sl>ould

clockwise,

and all

by

turning

until
leave

still operate in the voltage mode

tr>

WITH

to

be

connected

completely

terminals

Current

Note

CONTROL

MODE

each

thR

INDICATORS.

rRad

until

SLAVE

the current

into

the current

VOLTAGE

the setting

load).

-S

-OUT

TWO OR

counterclockwise. Connect a

of

each

Control

Only

to

apmoxi:r:atf'!y

the desired

output

read

the identical load current.

control

of

the

output

GRD.

+OUT

REMOVE
LINK

cur~ent

(~f-7-LJ-------i,·

MORE

ATE

SUPPLIES

in

series,

to

the

a-c

power I

ATE

supply.

to

the required load-current plus

one

SLAVE

its

maximum

All

uuwut

voltage

on all series connected supplies coun-

rnoc:e

MODE

"Master"

can

+S

unit

counterclockwise

"VOLTAGE

;no.

voltage level

as

read

CURRENT
indicator

current

now

be

(VOL

TAG[

is

out

MODE

energizes again.

controlled

MODE

v TWIST

1\

in

short-circuit,

shown,

MODE"

is

on

each

indicator

control

such

indicator

SENSING-

LEADS

[ )

v

'T'

DOD

!-ODD

TO

AC

INPUT

(}

e.

AdJust the

consis-

5%.

Turn

but

more

can

position.

indicators

reached. The

front

panel

"on",

that

the

by

the "Mas-

"on"

D

L

0

A

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(23H25)AND(41)-(42l

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(~h-)L---------{{1=-

1/4

RACK J

-S

-OUT

GRD.

+OUT

+S

l )

v.EMOVE

i~·

------------+-~[~)

LINKS

TWIST

LEADS

X

___________

v

PAR.

3-99

VALUE

FOR

SELECTION)

..

c-

DOD
ODD

ttl

·1

TO

AC

INPUT

SOURCE

SENSING-

ATE

_

1/4·2078

3-101

MASTER/SLAVE

SERIES OPERATION

Rf

I...---

WITH

ATE

6V

POWER SUPPLIES

PART

OF

PC-12

41------

-

--------

=1

(+) DRIVE SIGNAL

Eom(El)

(-)

(OUTPUT

FROM

3-102

VOLTAGE

MASTER

SUPPLY)

FIG.

3-23

DEVELOPING

ATE

power

3-97. Instead, the

par.

to

be

driven

unit

may

input

voltage (Ei)
voltage
ingly.
(
Ri (the closed

3K,

is

The values

Rf

+ Ri

Ri must

available

(E0m)

)/R

sup

pi

through

be

used

is

i.

For

loop

be

approximately

for

calibration.

I

.l

R

"I

I

I

I

24

(

...

_____

COMMON

_

------------------

THE

DRIVE

FOR

THE

MASTER/SLAVE

ies

with 6 volts

MASTER

its

full

to

proportion

to

the

VOLTAGE

amplified,

for

the example

gain

using

these resistors are calculated on the basis

of

maximum

output

output

the drive signal

PREAMP

of

two 6 volt

PREAMP

5K ohms.

ou

tru

voltage

voltage range.

COMPARISON

"A")

Rf

"A",

ATE

must

may

(6V)

by

As

to

selecting the value

supplies in series

be

be

r

Ib=O-ImA

diOV

SERIES

CONNECTION

t vol tJge cannot

must first

seen

the required level.

AMP

6 x

selected

be

amplified

from

FIG.

must

be

0-10

of

the

connection

(Rf + Ri)/Ri

to

be

a rheostat,

IOK

------

FOR

6V

be

master /slave connected

to

10

volts

3-23, one

for

equation:

= 10

of

the preamplifiers

For

a

0-1

rnA

volt.

Therefore, the

the external resistors

Eout

E0m =

or

(Rf + Ri)/Ri

so

that

a convenient gain

\,....---4--

Rf

(int.)

(+)

VOLTAGE-

COMPARISON AMP.

PART

SLAVE SUPPLY

_____

ATE

SUPPLIES.

as

described in

if

the

SLAVE

control

MASTER

(preamp)=
6V,

therefore (

""='

1.7.

ot

current

(Rt.

Ri) accord-

Ei

Letting

supply

the

(I b) the

= E

Rf + Ri

control

FEEDBACK

OF

slave

output

0111

Rf

I

I

ATE

_,

is

x

)/

=

3-103

3-105 As in the previously described

ATE

PARALLEL

3-104

Normally,
supply,
absorb the
setup
is

can
application
range
the
operation

1)

2)

3) Load wires should

4)

1/4-2078

working

of a fault-detection

"crowbared"

be

chosen

of

a single

maximum

in the voltage or
Parallel
Error

drops.

tightly.
Use

OPERATION OF ATE POWER SUPPLIES

crowbar

total

at hand.

the

equipped power supplies

in a parallel

output

for

for

rating

only

sensing,

Approximately
fault

any

paralleling

For

power

of

supplies

as

detection

current.

loop,

reason.

constant loads

supply),

a single

current

shown in the

be

configuration,

In the

which

shuts

"series"

ATE

power sup pi

or

the

"Automatic"

power

mode.

which

can

be

following

as

short

as

equal lengths

loop

circuit,

can

not

be

connected in parallel, since a triggered

would

present a short

ATE

power

supply,

off

all

power

supplies in a parallel

connections,

small load variations (load changes smaller than the

supply,

For

either

adjusted

pr3cticable. Select

of

as

described in par. 3-91.

an

"Automatic"

ies.

The choice between the

parallel

the

"Master/Slave"

method,

to

the

same

diagrams, can

wire

shoulrl

circuit

to

all

other

crowbar

connection

some general rules should

wire

be

used.

control

or a "Master

can

method

compliance

be

used

gauge

circuitry

configuration

two

be

used.

is

(output)

to

compensate

as

heavy

supplies and

is

/Slave"

methods

For

suitable.

be

voltage.

as

possible anrl

crowbar

would

provided,

if

one power supply

connection

wi

II

depend on the

maximum

load changes exceeding

Both

methods

observed:

for

load

have

allowing

method

output

wire

voltage

twist

in one

to

the

allow

wires

3-25

NOTE:

parallel rnode. As

#2

The diagram

since there

is

below

seen

from

FIG.

an

inital CJrljustment

(refer

to

FIG.

3-24) shows

3-24, load variations should

error

(6E

between the

)

0

how

the

be

confined

two

two

power supplies

to the stabiliLation negion

sucJ1Jiies.

opere~tc

/

/

/

in

the

automatic

of

SUPPLY

3-106

If

stabililcd

except

ing

initially

#2

just switches

that

output

error

in the

FIG.

current

sensing

"voltage)'

to

the

OUTPUT CURRENT

'\

3-24

"AUTOMATIC"

(rather than stabiliLed

is

not

needed.

mode (SUPPLY

"cwnmt"

mode (observe

MAumo

SUPPLY

------

\_OUTPUT

PARALLEL

For

stabiliLed

~t;

85U<O

~~z

No.

I

VOUAGE

OUTPUT

SUPPLY No.I i

VOLTAGE I

SUPPLY

No.2

OUTPUT CURRENT,

OPERATION

output

output

#2)

is

readjusted (counterclockwise)

front

panel

t'""""""~

~(!;

cr~

ucr

-<;\II

0:;~E·:~::E

' BETWEEN SUPPLY

I

voltage)

current,

MODE

""·

m ! /

SUPPLY

No.2

VOLTAGE;f'l

AND

SUPPLY

CURRENT

lo -

(TWO SUPPLIES).

is

iildicators.

LIMIT

SUPPLY No.I

desired, all previous cormnents arc

the

Current

~l~

e.-o

ozZ

~~

No.2

No.

Control

to

Q:LLJ

uoc

I

such a value

I

_jL

£).Eo

II

II

CURRENT

I

I

I

I

of

the supply operat·

that

SUPPLY

AND

SUPPLY

LIMIT
No.I

No.2

valid,

3-107

PROCEDURE,

Note.

1)

2)

3) Make all load

4) Place the

5)

3-26

AUTOMATIC

The parallel

Without

output
Adjust

power

current

identical,

voltage than the

maximum

of

rest
MODE

The

Current

SUPPLY

connection

connecting the

voltage on each
both

power

"off".

interconnections

individual

meters and rnode !ights on

one

of

load

the load

indicator

Cor1trol

#1

and SUPPLY #2, anrl

supply

a-c

the

power

other

current

current

"on").

of

PAR/\LLEL

of

two

power

supplies

supply

to

current

as

power

switches

supplies

(to

be

and

will

is

delivered

SUPPLY

CONNECTION

ATE

power

sup pi

to

the load

the desired value.

controls

shown in the

both

(to

designated

operate in the

by

#1

can

operation

to

connection

of

the

units. Since the

be

designated SUPPLY

SUPPLY

SUPPLY

r1ow

be

can proceed.

ies

is

or

their

power

described, although

to

each

other,

maximum

supplies in the

(extreme clockwise) po:oitiort.

diagram (refer

initial

output

#1

),

turn

will

more

can

be

a-c

power

"on",

and adjust the

to

FIG.

3 25).

"on"

position.
voltage adjustrnerlts were
be

at a

slightly

Observe

~1iqher

#2). Consequently, SUPPLY #1) vvill deliver its

current

#2

which

adjusted,

mode,

CURRENT

is

operatif)g in the voltage mode

as

to

equalize the

MOOt.

total

indir.c1tm

iuad

current

ATE

connected.

Turn

a-c

output

not

output

"on".

The

(VOLTAGE

between

1/4-2078

ON

PC-12:
REMOVE
(23)-(2!1)
ALL UNITS

JUMPER:

ON

I

PC-12

II

12

31

14

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16

71

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110

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~I

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DOD

l-000

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r

TO

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SOURCE

(}

~LOAD~

ATE

l/4-2078

:I

PC-12

II

12

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14

51

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71

IB
110

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1--

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491

ATE

1/4

3-25

CONNECTIONS

....

-S

l®l!r-t.-

'l~i!'f

t--

t-

SUPPLY#

~w~

RACK

FOR

-OUT

GRD.

,._,

...

-.

REMOVE LINKS

AUTOMATIC

+OUT

+S

j@1~1®1J~I

2

l-000

PARALLEL

r

ODD

TO

ACINPUT

SOURCE

(

}

OPERATION.

3-27

3-108

MASTER/SLAVE

3-109 This rnethod

required and all
MASTER/SLAVE
nected

from

3-110

MASTER
SENSING
current
mode, the

PROCEDURE,

1)

supply delivers load

AMPL

of

the

MASTER

All

power supplies

paralleling,

2)

Make all load and sensing connections
Turn

3)

supply
on

the

PARALLEL

is

especially convenient

control

connections

parallel rnodc, the

its

15V

bias and

changes

SLAVE

unit

is

trorn

units frorn

can

be

MASTER/SLAVE

to

be

set

edch power supply voltage

all power supplies

output

SLAVE

controls
supplies should

CONNECTION

with

ATE

power

supplies, since no external

can

be

made via the

EXT.

driven instead

current

1ero

;ero

from

to 1 volt.

to

the rnaxirnum Vdlue. While all Slave

CURRENT

from
;ero

Applied

COMPARISON

the

common

to

its rated maxinlUrn value, the signal

to

operated in either the voltage

PARALLEL

paralleled rnust

"on".

Observe trorn panel meters and

tor either voltagr:

be

CONNECTION

be

as

shown in

"on".

able;

to dclivrer the required cornpliance (load) voltage. Before

control

to this voltage.

FIG.

or

current

ATE's

rear

PROGRAMMING

MASTE:R

each

SL."'.VE:

or

the

current

3-26.

MODE

mode operation.

current

AMPL

on

each

CURRENT

unit,

SENSING

this signal programs the

units

will

rnode.

indicator(s).

All

CURRENT

sensing resistors

CONNECTOR.

SLAVE

unit
AMPL.

from

its

CURRENT

operate in the

AdJUSt

th~

MODE

indicator(s)

ar·e

In

the

is

discon-

As

the

output

current

MASTER

3-28

ATE

1/4-2078

ON

PC
REMOVE
(23)

-(25)

12:

JUMPER:

PC-12

12 II

14

31

J6

51

IS

71

110

91

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~-~14

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v

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ATE

1/4

(MASTER)

- S -QUT

GRD.

+OUT

r-DDD

([]]~~

--~=G-

+ S

DOD

r

,

TOAC

SOURCE

INPUT

IC~D

~LOAD~

ATE

1/4-2078A

ON

PC

12:

REMOVE

JUMPERS

(19)-

(20)

,(23)-(25)

AND(40)-(44)

ll

PC-12

:!

~:

16

51

Ia

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ho

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l12

4--l--414

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'ln®~~f0Jl®li8~

+S

v I

•------+------.1

/

•--•R•E•M•OV-E•L•IN•K--.P-------------.1

T

ODD

~ODD

TOAC

SOURCE

INPUT

<€~W~~~===~G-

l ATE

1/4

(SLAVE)

FIG. 3-26

RACK

MASTER/SLAVE

PARALLEL

J

CONNECTIONS

3-29

3-111

REDUNDANT

3-112

Two

ATE

fai1s

or

is

two

power supplies

be

rated

3-113 The

problem

configuration

now

an

redundant

disconnect the overvoltage sensing

remove

C26, thus successfully solving the

PARALLEL OPERATION

Power Supplies

interrupted

for

the

maximum

encountered

is

that

overvoltage occurs on either power supply, both supplies

circuit.

can

be

connected in parallel

in

any

other

manner, the

are

isolated

the overvoltage sensing leads are ususally

In the

from

each

other

load voltage and current

in

operating power supplies

ATE

power supplies, provisions are made on the

from

the errol sensing term ina!, reconnect it

problem

other

will

by

means

of

the

with

described.

to

a load

in

such a way

continue

of

ATE

overvoltage detection circuits

to

supply

external diodes

units used.

permanently

will

shut

(See

FIG. 3-27).

that
uninterrupted

(0"1,

02

wired

to

down,

defeating the purpose

control

to

REAR PROGR. CONN. PC-12

it

one

of

the power sup pi

load current. The

in

FIG.

3-28)

which

in

a redundant parallel

the error sensing leads.

circuit

P.C.

card

the

output

term ina! and

of

(Al),

ies

must

If

the

to

~-UNSOLDER

.------RECONNECT

®

R4 7 HERE

FIG.

3-27

HERE

IC71

LOCATION

IC61

OF

C22

OVERVOLTAGE

HERE

SENSING

LEAD

IC2

DISCONNECT.

AI

COMP.

SIDE

3-30

ATE

l/4-2078

3-114

PROCEDURE,

1) Remove covers
described in par. 3-113 and

and

2) Make

3)

Turn

(Supply
will
the
read-out on its

ATE

REDUNDANT

as

illustrated in

from

PARAL_LEL

both

ATE

FIG.

3-27.

as

illustrated in

all load and sensing connections

a-c

power

"on"

and

set

both

#1)

will

consequently

controller,

output

current.

invariable

be

increase its

front

be

at

in

contml

of

output

pam' I meters.

power supplies, locate A-1 P.C. card and rewire overvoltage sensing

4) Test the redundant parallel system
supply. The

other

supply should

now

OPERATION

FIG.

3-27. Remove capacitor C26

as

shovvn in

ATE

sunplies

CJ

sliqhtly

the load,

volt<,cw

slightly,

It

is

recommended the loading

by

manually

hiqher

while

FIG.

to
output

Supply
until

shutting

deliver the power

as

3-28.

the desired load voltage. One

voltage than the

#2

will

it takes

control

be

off

the

to

the load.

other

be

cut-off.

of

at least 10%

a-c

power

(Supply

If

the load

on the

as

described in par. 3-113

of

the

ATE

supplies

#2).

Supply

Supply

#2

is

as

evidenced

of

the rated maxirnurn

controlling

desired

by

power

#1

as

the

PC-12

12
14

16

Ia
IIO

112
114

116

ATE

1/4

SUPPLY#

I

l-000

<f[J]~)

RACK

FIG.

-~(}OURCE

3-28

REDUNDANT

'I"

DOD

PARALLEL

TO

ACINPUT

CONNECTION

PC-12

II

01

31

51
71

91

Ill

131
151

SUPPLY

#2

TB

201

TO

ACINPUT

~[j]~)-~(}

WITH

ATE

POWER SUPPLIES.

ATE

1/4-2078

3-31

3-115 PROGRAMMING WITH REFERENCE TO THE

3-116

/\TE

power supplies may

ii possible

standard power supplies. One example
common
power supplies, either the programming source
would

3-117 This problem

a

differential

programming signal back to the requied level

must

be

required.

to

solve application problems which

be

is

readily solved

attenuator,

be

used

the negative

permitting

in many unique applications. The

of

such

output

by

side

the

ATE

a level shift

of

power supply

(0-10V).

NEGATIVE

would

an

application problem

the power supply, rather than the positive side. With standard

would

of

the programming source,

POWER

require special

have

to

be

(See

FIG.

SUPPL

V OUTPUT

two

uncommitted

circuitry

is

the

completely

3-29). PREAMP

ATE

preamplifiers make

or additional equipment

case

in

which the programming

isolated, or

while

an

"A"

is

used

PREAMP

isolating interface

to

"B"

with

perform

brings the

as

1

PROGRAMMING

SOURCE

o'!,or---

~r~--~\tV\~----1.-~~~-r~--~~-----.----~

,.______

Rb

Ri(ext.)

33----

:11"30

1

I

___,.

~~~·

.. L ______

1 r

mr~~·~O]H''~~or•

------------------

Rf(ext.)

------

..

~~-~-1

_____

..

(+)

3-32

FIG.

3-29

PROGRAMMING

WITH

REFERENCE

Definition
E

0

Ea

=PREAMP
Eb
Ep'=
EP

R = R '

a a Voltage Divider

Rb = Rb'

of

Symbols

= Power Supply

=PREAMP

Common Mode Voltage

= Programming Voltage

"A"

"B"

Output

Output
Output

TO

in

THE

FIG.

Voltage
Voltage
Voltage

Network

NEGATIVE

3-29·

Limit

(10

OUTPUT

Volts

max.)

SIDE OF

THE

ATE.

ATE

1/4·20/L'

3-118

Component
output

voltage.

its

full

output
output
voltage,

PREAMP

Note:

side

Ep' < 10V,

The equation

selection

AN

voltage range

of

the

"A"

can

will

depend on the parameters

EXAMPLE·

ATE

is

we let

be

expressed

for

the standard

of

the programming source and the

An

ATE

model

with

an

output

by

a programming source (Ep)

grounded. Selecting the voltage

Ra

= Ra'

=1M

ohrn,

Rb = Rb'

by

differential

amplifier

of

0-10

divider

=lOOK

is

derived

voltage

volt

IRa',

ohm.

in

of

0-100

Volt

which

can

Rb'),

such

In this

Burr-Brown's

AT£=

is

programmed through

supply

0.1

rnA. The negetive

that

the common mode

case

the

output

"Operational

power supply

voltage

Amplifiers".

for

3-119 The

Since

thereby

must
the

Selecting a 1 K
Note:

close

3-120

PROCEDURE,

1)

2)

3)

next

step

is

to

select the

an

input

voltage (Eb)

the power supply

be

reversed and

output

equation is:

ohm

The selected resistors should

to

the

PROGRAMMING

PROGRAMMING

Connect
shown in

With
Vary

should vary
to

the

the

zero.

the

FIG.

EXT.

EXT.

output

amplified

resistor

approximately

for

external components,

3-30.

CONTROL

CONTROL

input

resistor

ot 0 to

CONNECTOR

10 volts

voltage) over its rated range, the previously derived signal

with

a gain

Ri

(ext.),

be

high

WITH

SOURCE at zero,

SOURCE
from

IRi

ext.)) and the feedback resistor

is

required

of

10. PREAMP

Rf

(ext)

must

quality

REFERENCE

the

zero voltage

components

terminals

LOAD

from

zero

to

drive the

"B"

be

10K

as

possible.

TO

THE

and the PRECISION

turn

ATE

"on".

to

10 volts. The

to

the rated value. Return the

is

used

ohrn
with

VOLTAGE

in the inverting

to

achieve the desired result.

a tolerance

NEGATIVE

ATE

VOLTMETER

output

(Rf

ext)

tor

COMPARISON

from

configuration,

of

1%.

They should

POWER SUPPLY

(M1)

voltage,

EXT.

as

CONTROL

PREAMP

AMPL

PREAMP

for

be

OUTPUT

to

the

read

out

SOURCE

"B".

(and

"A"

which

wired

ATE

on

as

as

M1,

FIG.

3-30

CONNECTIONS

Ra

EXT.

SOURCE

ON

PC-12:

REMOVE

(24)-

(35),(29)-

(33)-(34)

ADD

JUMPEr<:

(29)-(41)

Rb

CONTROL

FOR

JUMPERS:

(30)

AND(41

)-(42)

PROGRAMMING

PC-12

WITH

II

31

51

71

91

Ill

131

REFERENCE

L-----=----~1

r

Ra'

([il]~)

TO

THE

NEGATIVE

ODD

~ODD

TO

-----fa-

POWER SUPPLY

PRECISION

VOLTMETER

Ml

II II II

ooo

0

AC

INPUT

SOURCE

OUTPUT.

I

ATE

1/4-2078

3-33

3-121 APPLICATIOI\j OF THE ISOLATED FLAG SIGNALS

3-122

Two

opto-isola~ed

the

ATE

operating mode (Voltage
crowbar
Optical
verted

has

Isolator

to

TTL

(1) standard

supply,

the flag signal

flag signals are provided at the rear programming

or

been

tripped.

and change

logic signals

TTL

load

Both

as

(1.6rnA).

is

the

form

Current

flag signals consist

their

impedance frorn high

indicated in FIG. 3-31. The

Since the
of

a pulse, rather than a permanent level

Mode), the

crowbar

of

flag signal

PART

other

one provides a signal

the

Collector/Emrnitter

to

low

if

photo

is

followed

OF

PCI2

connector

(PC~12).

to

terminals

activated. The

ATE

transistors are capable

by

the shut-down

shift.

One

of

them signals

indicate

of

that

a Photo-Transistor

flag signals rnay

of

sinking at least one

of

the

ATE

the

be

power

ATE

con-

LOW=

CROWBAR

"oN"<MoMENTARYl

HIGH=

CROWBAR

11

11

0FF

LOW=

CURRENT
MODE

HIGH=VOLTAGE

MODE

COMMOM

FIG.

3-31

ISOLATED

7

I

I

8

PART

OF

ATE

ASS'Y.

MODE

FLAG

2

-

FLAG

SIGNAL

OUTPUTS.

I

3-34

ATE

1/4·2078