Tektronix PS 503A Manuale utente

OOilAAN7TED

D~L

.LEIVCE

503

®tJAL



SUPPL

INSTRUCTION

MANUAL

Tektronix,

Inc

Box500

Beaverton,

Oregon

97077



Serial

Number

070-1834-01



First

Printing

SLPT

1974

Page

SECTION



OPERATING

INSTRUCTFONS



1-1

SECTION

;



SPECIFICATION

AND

PEFIFORMANCE

CHECK



2-1

The

remaining

portion

this

Table,of

Contents

lists

servicing

instructions

that

expose

personnel

hazardous

voltages

These

instructions

are

for qualified

service

personnel

only



SECTION



ADJUSTMENT

SECTION



MAINTENANCE

AND

INTERFACING

INFORMATION



4-1

SECTION



CIRCUIT

DESCRIPTIpN



5-1

SECTION



REPLACEABLE

ELECTRICAL

PARTS

LIST



6-1

OPTIONS

'SECTION



DIAGRAM

AND

CIRCUIT

BOARD

.ILI

.USTRATION



7-1

SECTION



REPLACEABLE

MECHANICAL

PARTS

LIST

AND

EXPLODED

VIEW



8-1

CHANGE

INFORMATION

WARNING

TABLE

CONTENTS

503A

Fig

1-1

503A

Dual

Power

Supply

plug-in

module

INTRODUCTION



diode

well

dimming

the

VOLTS

indicator

light

the

supply

output

voltage

above

approximately

These

functions

are

easily

verified

momentarily

shor-

Description



ting

the output

the

supply

The

503A

dual

0 to

constant-voltage,

current-limited,

floating

power

supply

designed

operate

the

high-power

compartment

the

504

506

Power

Module

the

high-powercompartment,

provides a

floating

dual

Oto

Vdc

Operating



installation

and

Removal

standard

compartment

500

Series

Power

Module,

the

503A

supplies

floating

dual

400



c~~

The

supply

designed

for

conveniently

powering

complementary

and

linear

integrated

circuits

such

operational

and

differential

amplifiers

as well

differen-

tial

comparators

ground

referenced

auxiliary

supply

(suitable

for

bipolar

logic,

light-emitting

diodes,

incandescent

displays

and

similar

applications)

also

included

With the

floating

supply

available for

powering

discrete

interface

circuits

and

level

shifting,

the

503A

can

used

for

many

digital/analog

applications

The

plus

and

minus

outputs

from

the dual

floating

power

supplies

are

independently

variable

variable-at

constant

ratio

common

controi



,--

;

/align

`the

PS503A

chassis

with

the

upper

and

lower

supply

provides

dither

plus

or'mir~us

0to 20

with



`guides

the

selected

compartment

Push

the

module

respect

the

common

terminal,

connecting

across

the



and

press

firmly to

seat

the

circuit

board

the

inter

plus

and

minus

terminals,

the

PS503A

can

provide



connecting

jack

Either

terminal

may

be grounded

floated

350

(dc

peak

ac)

Each

supply

also features

con-

tinuously

variable

current

limiting

from

less

than

mAto



remove

the

503A,

pull

the

release

latch

400

(standard

compartment)

(high

power

compartment)

both

and

output



located

the

lower

left

corner,

until

the interconnecting

jack

disengages

and

the

503A

will

slide

out

The

presence

and

variability

the

output

voltage

verified

the

VOLTS

indicator

light

the

front

panel

The

brightness

this

light

varies

with

output voltage

panel-mounted

light-emitting

diode

(LED)

indicates

when



Controls

and

Connectors

the

503A

operating

standard

compartment

500

Series

Power

Module

and

the

output

current



Refer

Fig

1-3

Even though

the

503A

fully

limited

maximum

400

Other

panel-mounted,



calibrated

and

ready

use,

the

functions

and

actions

light-emitting

diodes

indicate

when

either

the



the

controls

and

connectors

should

reviewed

before

supply

goes

into

current-limiting

Hard

limiting

in-



attempting

use

Press

the

OUTPUT

button

apply

dicated

maximum

brightness

the

light-emitting



power

the

503A

REV

CMAR

1977

CAUTION

Section

1-PS

503A

OPERATING

INSTRUCTIONS

Turn the

power

module

off

before

inserting the

plug-

;

otherwise,

damage

may

occur

the

plug-in

circuitry

Because

the high

current

drawn

the

503A,

also

recommended

that

the

power

module

turned

off

before

removing

the

503A

Refer

Fig

1-2

Check

see

that

the

plastic

barriers

the interconnectingjack

theselected

power

module

compartment

match

the

cut-outs

the

503A

circuit

board

edge

connector

OperatingInstructions-PS

503A

Load

and

Monitor

Connections

POWER

MODULE

rrier

Improper

connections

between

the

power-supply

out-

put

and

the

load

(s)

monitoring

devices)

are

common

cause

of errors

Multiple

loadsor

monitoring

devices

must

connected

directly

the

output

terminals

with

separate

pairs

leads

shown

Fig

1-4

Avoid

using

clip

leads,

since

their

contact

resistance

can

exceed

the

output

impedance

the

503A

and

cause

significant

measurement

error

Fig

1-2

Plug-in

module

installation/removal

Bottom

Groove

PLUG-IN

Groundedand

Floating

Operation

OPERATINGCONSIDERATIONS

The

503A

and

-20

"floating"

supply

since

internal

connections

are

made

to either

the

chassis

Overheating



ground

The

supply

can

thus

used

positive

The

503A

designed

operate

ambient



negative

supply

simply,

connecting

between

the

com-

fAmr

Qrature

from

0°G

+5G"C

~lowever,

when



mon

and

the

negative

positive

uutpur

terminal

operating

saveral

power

supplies

rpe~?

;

i-p!ug-in

pow~



However,

there

may

:,desirable

effects

caused

module,

especially

low

output

voltages,

when



grounding

the

supply

the

chassis

while

the

load

operating close

other

heat-producing

equipment,

inter-



grounded

some

point

removed

from

the

supply

chassis

nal

temperature

may

exceed

safe

limits

and

actuate a



Forexample,

remote

load

connected

shown

in Fig,

thermal cutout

the

power

module

Refer

the

power



1-5

ground

currents containing

the

power-line

frequency

module

instruction

manual

for

complete

informa-



could

result

and

create

excessive noise

and

ripple

series

tion



with

the

load

Thus,

floating

operation

recommended

ensure

against

problems

caused

undersirable

ground

currents

ReverseCurrent

some

bias

supply

and

digital

circuitry

applications

the

load

might

behave

as a

current

source

for

part of

its

operating cycle

Since

the

output

circuit

series-

regulated

supply

unidirectional,

current

will

not

pass

the opposite

direction

except

through

undesirable paths

The

internal

reverse-current

diodes

conduct

only

when

the

503A

terminal

voltage

reverses

and

therefore

will

not

work

when

the

voltage

correctly

polarized

Connec-

REV

MAR

1977

4p0

LIMIT

Indicator

Light

emitting

diode

in-

dicates

whenPS

503A

installed

'standard

compartment

power

module,

limiting

the

current

output

VOLTS

Controls

and

Indicators

Variable

coarse

and

tine

controls

provide

con-

tinuously

variable

or-

voltage

election

from

the

respective

0-20

voli

supply

The

presence

and

variability

output

voltage

verified

'by

voltage

indicalor

lights

(OUTPUT

button

pressed)

Brightness

lights

varies

with

output

voltage

REV

MAR

1977

Floating

Output

Terminals

Fig

1-3



503A

controls

and

connectors

5-way

binding

post

ter-

minals

that

provide

either

positive

0-20-

volts

between

the

binding

post

the

right (red)

and

:OMMON,

negative

t)-20

volts

between

the

binding

past

the

left

(green)

and

COMMON

When

the

PS503A

in-

stalled

high

power

compartment

aTM

504

506

power

module

that

has a

high

;

power

compartment,

current

available

either

the

- outputs

from

less

than

100

to at

least

When

the

503A

compartment,

the

current



Output

Terminals

available

from

ess

than

100

`to



`least



5-way

binding-posttermi-

400

volt

out-



nals



that



provide



put

s'obtained'

between



ground-referenced

the

and

output

ter-



fixed

output

urinals

Operating

Instructions-PS

503A

VOLTS

DUAL

TRACKING

Control

When

pulled

out,

vanes

both

the'-1-'and

outputs

from

volts

value

set

the

and

VOLTS

controls

The

ratio

be-

tween

the+and-outputs

maintained

throughout

the

range

the

VOLTS

DUALTRACKING

con-

trol

OUTPUT

Pushbutton

When

pressed,

applies

power

both

0-20V

binding

post

terminals

and

the

+5V

binding

post

terminal

CURRENT

LIMIT

Controls

and

Indicators

Continuously

variable

controls

that

select

the

and

-output

current

limit

Light-emitting

diode

in-

dicates'

when

hard

limiting

occurs

installed

in a

standard

1834-05

OperatingInstructions-PS

503A

NOTE

Supply

connected

for

output

Over-voltage

POWER

SUPPLY

VOLT

METER

ting

shunt

resistor

(Rs)

shown

Fig

.1-6

provides an

external,

reverse-current

path

the

power

supply

sources

delivers

current

only

The

503A

protected

from

over-voltageconditions

over-voltage

protection

circuit

that

shuts

down

the

power

supply

when

the voltage

rises

about

POWER



ACTIVE

SUPPLY



LOAD

NOTE

Supply

connected

for

output

Fig,

t-4

Monitor

and

load

connections



Fig

1-4

Reversr

current

shunt

(Rs)

with

active

load

NOTE

The

point

which

the overvoltage

protection

blows

the

fuse

may

changed

forspeclfic

applications

changing

the

Zener

diode

OPERATION

The

following

steps

demonstrate

the

use

the

PS503A

controls

and

connectors

install

the

503A

into'(preferably)

the

high-power

compartment

the

power

module

Press

the

OUT

button

apply

power

the

PS503A

.Observethatthe+and-VOLTSindicatoriights

come

(the

lights

will

very

dim

low

voltages)

Single

Supply

Operation

(t20

Maximum)

Set the

and

VOLTS

controls

for

approximately

Turn

the

CURRENT

LIMIT

controls

fully

ccw

(to

NOTE



protect

the

ammeter)

Connect

ammeter

between

the

supply

connected

for

output



common

terminal

and

the

terminal

and

adjust

the

appropriate

CURRENT

LIMIT

control

for

the

maximum



)

Fig

1-5

Ground

loop

created

by grounded

remote

lead



desired

current

output

REV

MAR

1977

Removethe

ammeter

Connect

the

load

between

the



Stair-Step

Operation

common

terminal

and

the+or-terminal

Adjust

the+or



The

503A

can

be operated

provide

"stair-step"



VOLTS

control

for

the desired

output



output

characteristic

choosing

certain

load

limits

and

control

settings

Forexample,

Fig

.1-7showsthestair-step

output

from

the

503A

when

variable

load

(RL)

connected

between

the

and

output

terminals

With

each

supply

set for

maximum

voltage

and

current

(40



A) theoutput

voltage

remains

constant

from

open

circuit

Combined

Supply

Operation

(40

Maximum)



until

the

load

reachesapproximately

illustrated

1 .



Set the

and

VOLTS

control

for

approximately



the

solid

line in

Fig

1-7

this

crossover

point,

theoutput



and

turn

the

CURRENT

LIMIT

controls

fully

ccw

(to



voltage

decreases

with the

load

and

the output

current

protect

the

ammeter)



limited

Therefore,

below

approximately

S2,

both

supplies

act as

current

sources

with

output

voltage

variable

with

the load

Since

both

supplies

are

set

for

the



Connect

ammeter

between

the

and

ter-



same

output

voltage,

each

supply

shares equally

the

urinals

First

adjust

one

CURRENT

LIMIT

control

for

the



Power

output



one

supply

set

for

lower

output

maximum

desired current

output

;

then

adjust

the

other



voltage

than the

other,

output

power

shared

the

same

CURRENT

LIMIT

control

until

the

CURRENT

LIMIT



ratio

the output

voltage

indicator

just

reaches

maximum

brightness,

both



supplies

the

same

CURRENT

LIMIT

setting

Remove

the

ammeter

Connect

the

load

between

the

and

terminals

and

set

the

and

VOLTS

controls

that

both

settings

added

togetherequal

thedesired output

voltage

(See

Dual-Tracking

Operation

for

varying

the

output

with

the

VOLTS

DUAL

TRACKING

control

Dual-Tracking

Operation

When

pulled

out,

the

VOLTS

DUAL

TRACKING

control

varies

the output

both

supplies

a constant

ratio

from

zero

the value

set

the

and

VOLTS

controls

For

example,

the

and

VOLTS

controls

are

set for

maximum

output (approximately 20

V),

both

outputs

can

varied

from

zero

with

the

VOLTS

DUAL

TRACKING

control

ratio)

Likewise,

one

supply

set for

and

the other

for

each

change

the

output

will

matched

change

the 20

output

ratio)



Note

also that

matter

where

the

VOLTS

DUAL



TRACKING

control

set,

the

outputs

will

return

the



voltage

selected

the

and

VOLTS

control

when

the



VOLTS

DUAL

TRACKING

control

pushed

Therefore,



rapid

selection

two

preset

outputs

from each

supply



achieved

merely

switching the

VOLTS

DUAL



TRACKING

control

or out

REV

MAR

1977

Now,

setting

supplyEzforacurrentlimitof0

Aand

varying the

load

over

the

same

range, the

supplies

act

constant-voltage

sources

until

the load

reaches

ap-

proximately

that

crossover

point,

the

supply

set

for

(Ez)

becomes

current

source

and

its

output

OperatingInstructions-PS

503A

When

the

+and

supplies

are

connected

described



under

Combined

Supply

Operation,

the

VOLTS

DUAL



CURRENT

AMPERES

TRACKING

control

will

vary

the

output

from

zero

the

value

selected

by the

and

VOLTS

controls

added



Fig

1-7

Output

characteristics

with

various

currents, voltages,

together



and

loads

OperatingInstructions-PS

503A

voltage

decreases

with

the

load

approximately



Parallel-Connected

Supplies

and

supply

longer

contributes

the

power

output

Subsequently,

supply

supplies

all

the output



"""'

power

and

operates

as a

constant-voltage

source

with



CAUTION

output

current

variable

with

the

load

Then,

ap-

proximately

f2,

supply

crosses over

and

becomes



Parallel

operation

not

recommended

unless

current

source

its

maximum

output

Thus,



forward biased

diode

capable

of handling

the

re-

choosing

the appropriate

load

limits

and

control

settings,



quired current

and

voltage

inserted

between

each

any

the

four

operating

characteristics

possible



power

supply

and

the

load

Failure

this

may

cause

power

supply

damage

second

stair-step

output

can

preselected

and

switched

out

with

the

VOLTS

DUAL

TRACKING



The

outputs

two

503's

can

connected

control

(see

Dual-Tracking

Operation

for

details

on the



parallel

shown

Fig

1-9

obtain

output

current

function

the

VOLTS

DUAL

TRACKING

control)



equal

the

sum

theoutput

currents

from

each

supply

Each

supply

must

be adjusted

individually

obtain

the

desired output current

Series-Connected

Supplies

The

outputs

two

503A's

can

con-

nected

series

shown

Fig

1-8

obtain

an output

voltage

equal

the

sum

the

output

voltages

from

each

supply

Each

supply

must be

adjusted

individually to

obtain

the

desired

output voltage

(see

Dual-Tracking

Operation

for

varying

the

output

both

supplies

with

the

VOLTS

DUAL

TRACKING

control)

One

supply

should

set for

the

desired

output

voltage

NOTE



and

the other

for

slightly

higher

voltage

The

supply

set

forthe desired voltage

will

then

become

a constant

voltage

The

503A

has

internal

diodes

connected

across



source, while the

supply

with

the

higher voltage output

the

output

protect

the

series-connected

supplies



becomes

current

source

(due

automatic

crossover),

against

reverse

polarity

the load

shorted,

one



which

results

their

output

voltage

decreasing

that

the

supplies

not



the

supply

with

the

lowest

output

voltage

POWER



POWER

SUPPLY



SUPPLY

LOAD

NOTE

Each

supply

connected

for

output

NOTE

The

and

supplies

are

internally

connected

series

Therefore,

the

and

supplies

cannot

externally

connected

parallel

obtain

output

current

equal

the

sum

the

currents

from

each

supply

POWER



POWER

SUPPLY



SUPPLY

NOTE

Each

supply

connected

for

output

Fig

1-8

Supplies

series-connected



Fig

1-9

Supplies

parallel-connected

REV

MAR

1977

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