HP 6259B Service manual

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REGULATED

DC

POWER

SUPPLY

MODELS

6259B,

6260B,

6261B,

6268B,

6269B

*

OPERATING

AND

SERVICE

MANUAL

FOR

MODEL

6259B,

SERIALS

1535A-00651

AND

ABOVE

MODEL

6260B,

SERIALS

1545A-01026

AND

ABOVE

MODEL

6261B,

SERIALS

1543A-00551

AND

ABOVE

MODEL

6268B,

SERIALS

1539A-01481

AND

ABOVE

MODEL

6269B,

SERIALS

1535A-01631

AND

ABOVE

*

For

instruments

with

serial

numbers

above

those

listed,

a

change

page

may

be

included.

HP

Part

No.

5950-1766

Printed:

March,

1976

TABLE

OF

CONTENTS

Section

Page

I

GENERAL

INFORMATION

_1-1

1-1

DESCRIPTION

.11

1-8

SPECIFICATIONS

.1-1

1-10

OPTIONS

.1-2

1-12

INSTRUMENT/MANUAL

IDENTIFICATION.1-2

1-

15

ORDERING

ADDITIONAL

MANUALS

.1-3

II

INSTALLATION

.

2

1

2-

1

INITIAL

INSPECTION.2-1

2-3

Mechanical

Check

.2-1

2-5

Electrical

Check.:

.

.

2-1

2-7

INSTALLATION

DATA

.2-1

2-9

Location

and

Cooling

.2-1

2-11

Outline

Diagram.2-1

2-13

Rack

Mounting

.2-1

2-15

INPUT

POWER

REQUIREMENTS

.2-1

2-17

INPUT

LINE

VOLTAGE

OR

FREQUENCY

CONVERSION

.

2-2

2-20

Converting

a

Standard

Instrument

to

208-Volt

Operation

(Models

6259B,

6261

B,

and

6268BL

.

.

2-2

2-22

Converting

a

Standard

Instrument

to

208-Volt

Operation

(Models

6260B

and

6269B).2-2

2-24

Converting

a

Standard

Instrument

to

115-Volt

Operation

(Models

6259B,

6261

B,

and

6268B).

.

.

2-2

2-26

Converting

a

Standard

Instrument

to

115-Volt

Operation

(Model

6260B)

.2-3

2-28

Converting

a

Standard

Instrument

to

50Hz

Operation

.2-3

2

30

INPUT

POWER

CONNECTIONS

.

2-3

2-

32

REPACKAGING

FOR

SHIPMENT.24

II!

OPERATING

INSTRUCTIONS

.3-1

3-

1

TURN-ON

CHECKOUT

PROCEDURE.3-1

3-3

OPERATING

MODES.3-2

3

6

NORMAL

OPERATING

MODE.

.

3-2

3-8

Constant

Voltage

Operation

....

3-2

3-10

Constant

Current

Operation

....

3-2

3-12

Overvoltage

Trip

Point

Adjustment.3-2

Section

Page

III

3-15

Connecting

The

Load

.3-3

(con't.)

3-20

Operation

With

No

Load.3-3

3-22

Operation

Beyond

Rated

Output

.3-3

3-24

OPTIONAL

OPERATING

MODES.3-3

3-27

Remote

Voltage

Sensing

.3-3

3-34

Remote

Programming

.3-5

3-51

Auto-Parallel

Operation.3-8

3-57

Auto-Series

Operation.3-8

3-67

Auto-Tracking

Operation.3-10

3-76

SPECIAL

OPERATING

CONSIDERATIONS.3

12

3-77

Pulse

Loading.3-12

3-79

Output

Capacitance.3-12

3-82

Reverse

Voltage

Protection

....

3-12

3-85

Reverse

Current

Loading.3-12

3-87

Battery

Charging.3-12

3-

91

Battery

Discharging.3-13

IV

PRINCIPLES

OF

OPERATION

.

.

4

1

4-

1

OVERALL

BLOCK

DIAGRAM

DISCUSSION_4-1

4-16

DETAILED

CIRCUIT

ANALYSIS.4-3

4-17

Preregulator

Control

Circuit

....

4-3

4-27

Overvoltage

Limit

Circuit.4-4

4-29

Series

Regulator

and

Driver

....

4-4

4-31

Short-Circuit

Protection

.4-4

4-33

Constant-Voltage

Comparator

...

4-4

4-40

Constant-Current

Comparator

...

4-5

4-45

Voltage

Clamp

Circuit.4-6

4-48

Mixer

and

Error

Amplifiers

....

4-6

4-52

Overvoltage

Protection

Crowbar.

.

4-6

4-58

Turn-On

Control

Circuit

.4-7

4-61

Reference

Regulator.4-7

4-66

Meter

Circuit.4-7

4-

70

Additional

Protection

Features

.

.

4-7

V

MAINTENANCE.5-1

5-

1

INTRODUCTION

.5-1

5-3

TEST

EQUIPMENT

REQUIRED.5-2

5-5

PERFORMANCE

TEST.5-2

5-7

CONSTANT-VOLTAGE

TESTS.

.

5-2

5

38

CONSTANT-CURRENT

TESTS.

.

5-6

5-49

TROUBLESHOOTING.5-8

iii

TABLE

OF

CONTENTS

(Continued)

Section

Page

Section

Page

V

5-54

OVERALL

TROUBLE-

V

5-100

Ripple

Balance

Adjustment

.

.

.

5-19

(con't.)

SHOOTING

PROCEDURES

.

5-8

(con't.)

5-102

Preregulator

Tracking

5-60

Disassembly

Procedures

.

.

5-15

Adjustment

.

.

.

5-20

5-69

REPAIR

AND

REPLACEMENT

.

5-16

5-104

Crowbar

Trip

Voltage

5-71

ADJUSTMENT

AND

Adjustment.

.

.

5-20

CALIBRATION

.

.

5-16

5-106

Maximum

Crowbar

Trip

5-73

Meter

Zero

Adjustment.

.

5-16

Voltage

Adjustment.

.

.

5-20

5-75

Voltmeter

Calibration

.

.

5-16

5-108

Disabling

the

Crowbar

.

.

.

.

.

.

5-20

5-77

Ammeter

Calibration

.

.

5-17

5-79

Constant-Voltage

Programming

VI

REPLACEABLE

PARTS

.

.

.

6-1

Calibration.

.

5-17

5-89

Constant-Current

Programming

VII

CIRCUIT

DIAGRAM

AND

Calibration.

.

5-18

COMPONENT

LOCATION

5-98

Load

Transient

Recovery

Time

DIAGRAMS

.

.

.

7-1

Adjustment

.

.

5-19

IV

SECTION

I

GENERAL

INFORMATION

1-1

DESCRIPTION

1

-2

The

five

constant-voltage/constant

current

power

supply

models

included

in

this

manual

use

a

transistor

series-regulator

combined

with

a

triac

preregulator

for

high

efficiency,

excellent

regulation,

and

low

ripple

and

noise.

These

supplies

are

packaged

in

7-inch

high

full-rack-width

cabinets

that

are

suitable

for

either

bench

or

relay

rack

operation.

1

-3

The

outputs

of

these

supplies

can

be

varied

from

zero

to

full

rated

voltage

or

current

by

setting

coarse

and

fine

voltage

and

current

controls

on

the

front

panel

or

they

can

be

programmed

remotely

by

resistance

or

voltage

inputs

to

rear

panel

terminals.

When

the

voltage

controls

are

used

to

establish

a

constant

output

voltage,

the

current

controls

establish

a

current

limit

that

can

protect

the

load

from

over¬

current.

When

the

current

controls

are

used

to

establish

a

constant

output

current,

the

voltage

controls

establish

a

voltage

limit

that

can

protect

the

load

from

excessive

voltage.

The

crossover

from

constant-voltage

to

constant-

current

operation,

or

vice

versa,

occurs

automatically

when

the

load

current

reaches

the

value

established

by

the

current

controls

or

the

voltage

reaches

the

value

established

by

the

voltage

controls.

The

output

voltage

and

current

can

both

be

monitored

continuously

on

front

panel

meters.

1-4

Output

loads

are

further

protected

by

a

built-in

fast-acting

overvoltage

protection

crowbar

circuit

that

automatically

shorts

the

supply's

output

terminals

if

a

preset

voltage

limit

is

exceeded.

A

front

panel

control

sets

the

voltage

at

which

the

crowbar

trips

and

can

be

adjusted

from

approximately

10%

to

110%

of

the

supply's

maximum

rated

voltage.

When

several

supplies

are

installed

in

the

same

system,

whether

in

series,

parallel,

or

independently,

their

crowbar

circuits

can

be

interconnected

so

that

all

will

trip

simultaneously

whenever

any

one

of

them

does.

1

-5

These

power

supplies

are

forced

air

cooled.

1-6

The

ac

input

connections

to

these

supplies

are

made

at

rear

panel

terminals.

All

dc

output,

remote

sensing,

and

remote

programming

connections

are

also

made

at

rear

panel

terminals.

Either

the

positive

or

negative

output

terminal

of

a

supply

may

be

grounded

or

the

supply's

output

may

be

floated

at

up

to

300

volts

above

ground.

1-7

Remote

programming,

remote

sensing,

and

several

methods

of

operating

supplies

in

combination

of

two

or

three

are

made

possible

by

rear

panel

terminals

that

allow

access

to

control

points

within

the

regulator

circuits.

These

capabilities

are

described

below.

a.

Remote

Programming.

The

power

supply's

output

voltage

or

current

(or

both)

can

be

controlled

from

a

remote

location

by

varying

a

resistance

or

a

voltage

input

signal

to

the

supply's

voltage

or

current

regulator

circuit.

b.

Remote

Sensing.

Connecting

the

voltage

regulator's

feedback

circuit

to

the

load

terminals

rather

than

to

the

supply's

output

terminals

prevents

the

voltage

drop

in

the

load

leads

from

impairing

voltage

regulation

at

the

load

when

operating

in

the

constant

voltage

mode.

A

separate

pair

of

sensing

leads

which

carry

no

load

current

extend

the

feedback

loop

to

the

load

terminals.

c.

Auto-Parallel

Operation.

Two

or

three

similar

supplies

connected

in

parallel

can

be

made

to

share

loads

equally

and

can

be

controlled

by

the

voltage

and

current

controls

(or

remote

programming

terminals)

of

one

of

the

supplies

designated

the

master

if

they

are

connected

for

auto-parallel

operation.

Normally,

only

supplies

having

the

same

model

number

are

connected

in

auto-parallel,

but

auto-parallel

operation

can

be

used

with

any

of

the

supplies

covered

by

this

manual

that

have

equal

current

capabilities.

d.

Auto-Series

Operation.

Two

or

three

supplies

can

be

connected

in

series

and

have

their

outputs

simultaneously

controlled

by

the

voltage

and

current

controls

(or

remote

programming

terminals)

of

one

of

the

supplies

designated

the

master.

The

voltage

contributed

by

each

slave

is

main¬

tained

in

a

constant

ratio

to

that

of

the

master.

These

ratios

can

be

set

as

desired.

Auto-series

operation

provides

higher

output

voltages

in

constant

voltage

operation

and

greater

voltage

compliance

in

constant

current

operation.

Any

HP

supply

that

offers

auto-series

operation

can

serve

as

a

slave

supply;

the

master

supply

does

not

have

to

be

an

auto-series

model.

e.

Auto-Tracking

Operation.

Auto-tracking

is

similar

to

auto-series

operation

except

that

two

or

three

supplies

share

a

common

negative

output

bus

and

are

interconnected

so

that

the

output

voltage

of

each

slave

supply

is

maintained

at

some

constant

fraction

of

that

of

the

master

supply.

All

of

the

supplies

are

controlled

through

the

master

supply,

and

each

supply

feeds

a

separate

load.

1-8

SPECIFICATIONS

1-9

Detailed

specifications

for

these

power

supplies

are

given

in

Table

1

-1.

M

1-10

OPTIONS

Option

No.

Description

1-11

Options

are

customer-requested

factory

modifica¬

tions

of

a

standard

instrument.

The

following

options

are

available

for

the

instruments

covered

by

this

manual.

Where

necessary,

detailed

coverage

of

the

options

is

included

throughout

the

manual.

Option

No.

Description

005

Realign

ment

for

50Hz

Operation

:

Standard

instruments

are

designed

for

57

to

63Hz

operation.

For

50Hz

operation,

a

resistor

in

the

preregulator

control

circuit

is

changed

and

the

preregulator

is

realigned.

007

T

en-Turn

Output

Voltage

Control:

A

ten-

turn

control

replaces

the

coarse

voltage

con¬

trol

for

improved

resolution

in

setting

the

output

voltage.

008

Ten-Turn

Output

Current

Control:

A

ten-

turn

control

replaces

the

coarse

current

control

for

improved

resolution

in

setting

the

output

current.

009

Ten-Turn

Output

Voltage

and

Current

Control

s:

This

option

includes

Options

007

and

008

in

the

same

instrument.

010

C

hassis

Slides

:

Factory

installed

slides

permit

convenient

access

to

the

interior

of

a

rack

mounted

supply

for

maintenance.

013

Three-Digit

Graduated

Decadial

Voltage

Control:

To

improve

mechanical

stability

and

permit

accurate

resetting

of

the

output

voltage,

Option

013

replaces

the

coarse

voltage

control

with

a

ten-turn

control

equipped

with

a

3-digit

turns-counting

dial.

014

Three-Digit

Graduated

Decadial

Current

Control

:

To

improve

mechanical

stability

and

permit

accurate

resetting

of

the

output

current.

Option

014

replaces

the

coarse

current

control

with

a

ten-turn

control

equipped

with

a

3-digit

turns-counting

dial.

016

Rewiring

for

11

5Vac

±10%

Single-Phase

Input

(Model

6260B

only):

This

factory

modification

replaces

the

circuit

breaker

and

power

transformer,

adds

a

resistor

to

the

A2

assembly,

and

reconnects

the

bias

trans¬

former,

preregulator

choke,

and

fans

for

11

5Vac

operation.

020

Adjustable

Voltage

Programming

:

Two

screwdriver-adjustable

controls

accessible

through

holes

in

the

rear

panel

allow

the

voltage

programming

coefficient

and

zero

output

voltage

to

be

adjusted

conveniently

to

an

accuracy

of

0.1%.

021

Adjustable

Current

Programming:

Two

screwdriver-adjustable

controls

accessible

through

holes

in

the

rear

panel

allow

the

current

programming

coefficient

and

zero

output

current

to

be

adjusted

conveniently

to

an

accuracy

of

0.1%.

022

Adjustable

Voltage

and

Current

Programming:

This

option

includes

Options

020

and

021

in

the

same

instrument.

026

Rewiring

for

11

5Vac

±10%

Single-Phase

Input

(Models

6259B,

6261

B,

and

6268B

only):

This

factory

modification

replaces

the

circuit

breaker

(except

in

the

Model

6259B),

adds

a

resistor

to

the

A2

assembly,

and

reconnects

the

power

transformer,

bias

transformer,

preregulator

choke,

and

fans

for

115Vac

operation.

027

Rewiring

for

208Vac

+10%

Single-Phase

Input:

This

factory

modification

reconnects

the

power

and

bias

transformers

for

208Vac

operation.

040

Interfacing

for

Mu

ltiprogrammer

Operation

:

This

factory

modification

prepares

standard

power

supplies

for

resistance

programming

by

the

6940B

Multiprogrammer

or

the

6941

B

Multiprogrammer

Extender.

Operation

with

either

of

these

instruments

requires

that

the

power

supply

be

subjected

to

a

special

calibration

and

a

protection

checkout.

The

special

calibration

insures

that

the

power

supply

can

be

accurately

set

to

zero

and

to

the

maximum

rated

output

voltage

or

current

when

programmed

by

the

multiprogrammer.

The

protection

checkout

insures

that

the

power

supply

will

not

be

damaged

by

the

rapid

repetitive

programming

possible

with

the

multiprogrammer.

This

option

includes

Option

022.

1-12

INSTRUMENT/MANUAL

IDENTIFICATION

1-13

Hewlett-Packard

power

supplies

are

identified

by

a

1-2

two-part

serial

number.

The

first

part

is

the

serial

number

prefix,

a

number-letter

combination

that

denotes

the

date

of

a

significant

design

change

and

the

country

of

manu¬

facture.

The

first

two

digits

indicate

the

year

(10

=

1970,

11

=

1971,

etc.),

the

second

two

digits

indicate

the

week,

and

the

letter

"A”

designates

the

U.

S.

A.

as

the

country

of

manufacture.

The

second

part

is

the

power

supply

serial

number.

A

different

sequential

number

is

assigned

to

each

power

supply,

starting

with

001

01.

1-14

If

the

serial

number

on

your

instrument

does

not

agree

with

those

on

the

title

page

of

the

manual.

Change

Sheets

supplied

with

the

manual

define

the

differences

between

your

instrument

and

the

instrument

described

by

this

manual.

1-15

ORDERING

ADDITIONAL

MANUALS

1-16

One

manual

is

shipped

with

each

power

supply.

Additional

manuals

may

be

purchased

from

your

local

Hewlett-Packard

field

office

(see

list

at

rear

of

this

manual

for

addresses).

Specify

the

model

number,

serial

number

prefix,

and

HP

part

number

shown

on

the

title

page.

Table

1-1

Specifications:

Models

6259B,

6260B,

6261B,

6268B,

6269B

INPUT:

230Vac

±10%,

single

phase,

57-63Hz

for

the

standard

models.

(For

other

input

voltages

or

50Hz

operation,

see

the

option

listings

in

paragraph

1-10.

Input

power

require¬

ments

are

listed

in

paragraph

2-1

5.

OUTPUT:

Model

6259B

0-10

volts

at

0-50

amps

6260B

0-10

volts

at

0-100

amps

6261

B

0-20

volts

at

0-50

amps

6268B

0-40

volts

at

0-30

amps

6269B

0-40

volts

at

0-50

amps

LOAD

EFFECT

(LOAD

REGULATION):

Constant

Voltage

—

Less

than

0.01%

of

output

plus

200pV

for

a

load

change

equal

to

the

current

rating

of

the

supply.

Constant

Current

—

Models

6259B

and

6261

B

-

Less

than

0.02%

of

output

plus

1

mA

for

a

load

change

equal

to

the

voltage

rating

of

the

supply.

Models

6260B,

6268B,

and

6269B

-

Less

than

0.02%

of

output

plus

2mA

for

a

load

change

equal

to

the

voltage

rating

of

the

supply.

SOURCE

EFFECT

(LINE

REGULATION):

Constant

Voltage

-

Less

than

0.01

%

of

output

plus

200pV

for

a

change

in

line

voltage

between

208

and

254Vac

(or

104

and

1

27Vac)

at

any

output

voltage

and

current

within

rating.

Constant

Current

-

Models

6259B

and

6261

B

-

Less

than

0.02%

of

output

plus

1

mA

for

a

change

in

line

voltage

between

208

and

254Vac

(or

104

and

127Vac)

at

any

output

voltage

and

current

within

rating.

Models

6260B,

6268B,

and

6269B

-

Less

than

0.02%

of

output

plus

2mA

for

a

change

in

line

voltage

between

208

and

254Vac

(or

104

and

127

Vac)

at

any

output

voltage

and

current

within

rating.

PARD

(RIPPLE

AND

NOISE):

(Measured

within

20Hz

to

20MHz

bandwidth)

Model

Constant

Voltage

Constant

Current

6259B

500pVrms/5mV

p-p

25mA

rms

6260B

500pVrms/5mV

p-p

50mA

rms

6261

B

500pVrms/5mV

p-p

25mA

rms

6268B

1

mVrms/5mV

p-p

20mA

rms

6269B

1mVrms/5mV

p-p

25mA

rms

TEMPERATURE

COEFFICIENT:

Constant

Voltage

-

Less

than

0.01%

plus

200pV

change

in

output

per

degree

Celsius

change

in

ambient

following

a

30-minute

warmup.

Constant

Current

-

Models

6259B,

6261

B,

and

6269B

-

Less

than

0.01

%

plus

4mA

change

in

output

per

degree

Celsius

change

in

ambient

following

a

30-minute

warmup.

Model

6260B

-

Less

than

0.01

%

plus

8mA

change

in

output

per

degree

Celsius

change

in

ambient

following

a

30-minute

warmup.

Model

6268B

-

Less

than

0.01%

plus

2mA

change

in

output

per

degree

Celsius

change

in

ambient

following

a

30-minute

warmup.

DRIFT

(STABILITY):

(Change

in

output

(dc

to

20Hz)

over

an

8-hour

interval

under

constant

line,

load,

and

ambient

temperature

follow¬

ing

a

30-minute

warmup.)

Constant

Voltage

-

Less

than

0.03%

of

output

plus

2mV.

Constant

Current

—

Models

6259B,

6261

B,

and

6269B

-

Less

than

0.03%

of

output

plus

10mA.

Model

6260B

-

Less

than

0.03%

of

output

plus

20mA.

Model

6268B

-

Less

than

0.03%

of

output

plus

5mA.

1-3

Table

1-1

Specifications:

Models

6259B,

6260B,

6261B,

6268B,

6269B

(Continued)

LOAD

TRANSIENT

RECOVERY

TIME:

Less

than

50/Jsec

is

required

for

output

voltage

recovery

(in

constant

voltage

operation)

to

within

lOmV

of

the

nominal

output

following

a

change

in

output

current

equal

to

the

current

rating

of

the

supply

or

5

amps,

whichever

is

smaller.

REMOTE

PROGRAMMING

COEFFICIENTS:

Output

Voltage

Programming

—

Resistance

Voltage

Model

Control

(±1

%)

Control

(±1%)

All

Models

200JT2/V

1V/V

Output

Current

Programming

—

Resistance

Voltage

Model

Control

(±10%)

Control

(±10%)

6259B

4I2/A

lOmV/A

6260B

2£2/A

5mV/A

6261

B

4L2/A

10m

V/A

6268B

6J2/A

16.7mV/A

6269

B

4L2/A

1

OrnV/A

REMOTE

PROGRAMMING

SPEED:

(Typical

time

required

to

nonrepetitively

change

from

zero

to

within

99.9%

of

the

maximum

rated

output

voltage

or

from

the

maximum

rated

output

of

that

voltage

above

zero.)

voltage

to

within

0.1

%

Model

Up,

Full

Load

Down,

Full

Load

6259B

70ms

10ms

6260B

70ms

5ms

6261

B

1

50ms

25ms

6268B

300ms

30ms

6269B

350ms

20ms

Model

Up,

No

Load

Down,

No

Load

6259B

70ms

200ms

6260B

70ms

200ms

6261

B

1

50ms

250ms

6268B

300ms

Isec

6269B

350ms

Isec

PANEL

METERS:

The

accuracy

of

the

front

panel

voltmeter

and

ammeter

is

±2%

of

full

scale.

The

ranges

of

these

meters

are:

Model

Model

6259B

12V,60A

6268B

50V,35A

6260B

12V,

120A

6269B

50V,

60A

6261

B

24V,

60A

TEMPERATURE

RATINGS:

Operating

0

to

55'C

Storage

-40

to

+75

C

COOLING:

These

power

supplies

are

forced

air

cooled.

The

Model

6259B

is

cooled

by

a

single

fan;

the

other

models

are

cooled

by

two

fans.

RESOLUTION:

(Minimum

output

voltage

or

current

change

that

can

be

obtained

using

the

front

panel

controls.)

Model

Constant

Voltage

Constant

Current

6259

B

1

m

V

50mA

6260B

1

mV

100mA

6261B

2mV

50mA

6268B

5m

V

30mA

6269B

5m

V

50mA

OUTPUT

IMPEDANCE

(TYPICAL):

Approximated

by

a

resistance

in

series

with

an

inductance

as

follows:

Model

Model

6259B

0.05mft,

IpH

6268B

0.2m£2,

1/uH

6260B

0.02m£2,

IpH

6269B

0.1m£2,

IpH

6261

B

0.01mS2,

IpH

OVERVOLTAGE

PROTECTION

CROWBAR:

To

avoid

false

tripping,

the

recommended

trip

margin

above

the

output

voltage

is

5%

of

the

output

voltage

plus

2

volts

for

Models

6259B,

6260B,

and

6261

B,

and

5%

of

the

output

voltage

plus

1

volt

for

Models

6268B

and

6269B.

The

approximate

crowbar

trip

voltage

ranges

are:

Model

Model

6259B

2V-12V

6268B

4V-45V

6260B

2V-12V

6269B

4V-45V

6261

B

2V-23V

OPTIONS

AVAILABLE:

(See

paragraph

1-10

for

descriptions)

All

Models

-

Options

005,

007,

008,

009,

010,

013,

014,

020,

021,

022,

027,

040.

Model

6260B

only

—

Option

016.

Model

6259B,

6261

B,

and

6268B

only

—

Option

026.

INPUT

POWER

CONNECTIONS:

Input

power

is

connected

by

way

of

a

3-terminal

barrier

Trip

on

the

rear

panel.

DIMENSIONS:

(See

Figure

2-1

outline

diagrams.)

WEIGHT:

Model

Net

Shipping

6259B

69

lbs.

(31.3

kg)

78

lbs.

(35.3

kg)

6260B

97

lbs.

(43.9

kg)

106

lbs.

(48.0

kg)

6261

B

78

lbs.

(35.3

kg)

87

lbs.

(39.4

kg)

6268B

76

lbs.

(34.4

kg)

84

lbs.

(38.1

kg)

6269B

89

lbs.

(40.3

kg)

98

lbs.

(44.0

kg)

1-4

SECTION

II

INSTALLATION

2-1

INITIAL

INSPECTION

2-2

Before

shipment,

this

instrument

was

inspected

and

found

to

be

free

of

mechanical

and

electrical

defects.

As

soon

as

the

instrument

is

unpacked,

inspect

for

any

damage

that

may

have

occurred

in

transit.

Save

all

packing

materials

until

the

inspection

is

completed.

If

damage

is

found,

file

a

claim

with

the

carrier

immediately.

The

Hewlett-Packard

Sales

and

Service

office

should

be

notified

as

soon

as

possible.

2-3

Mechanical

Check

2-4

This

check

should

confirm

that

there

are

no

broken

knobs

or

connectors,

that

the

cabinet

and

panel

surfaces

are

free

of

dents

and

scratches,

and

that

the

meters

are

not

scratched

or

cracked.

2-5

Electrical

Check

2-6

The

instrument

should

be

checked

against

its

electrical

specifications.

Section

V

includes

an

"in-cabinet”

performance

check

to

verify

proper

instrument

operation.

2-7

INSTALLATION

DATA

2-8

The

instrument

is

shipped

ready

for

permanent

rack

installation

or

bench

operation.

It

is

necessary

only

to

connect

the

instrument

to

a

source

of

power

and

it

is

ready

for

use.

2-9

Location

and

Cooling

2-10

These

instruments

are

fan-cooled

and

must

be

installed

with

sufficient

space

for

cooling

air

to

reach

their

sides.

These

power

supplies

should

be

used

in

an

area

where

the

ambient

temperature

does

not

exceed

55"C.

2-11

Outline

Diagram

2-1

2

Figure

2-1

shows

the

outline

shape

and

dimensions

of

these

supplies.

2-13

Rack

Mounting

2-14

This

instrument

is

full

rack

size

and

can

be

easily

rack

mounted

in

a

conventional

19-inch

rack

panel

using

standard

mounting

screws.

TERMINAL

STRIP

DETAIL

-esi;te

.*•:«»«

5.1

n

sing

336=?

tEPM

0

52

-!/«•

70

ffrON'

Cl¥ENOCHS

6

9e8:ir?*<p'

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*1*

5

50'.4

8»t

i

TOP

3'S

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54

9mr»|

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SIDE

Figure

2-1.

Outline

Diagrams

(Models

6259B,

6260B,

6261B,

6268B,

and

6269B)

2-15

INPUT

POWER

REQUIREMENTS

2-16

The

standard

instrument

is

wired

for

a

nominal

input

of

230Vac

57-63Hz

when

it

is

shipped

from

the

factory.

The

supplies

covered

by

this

manual

are

also

available

equipped

for

a

208-volt

input

(Option

027),

and

except

for

the

Model

6269B,

are

also

available

equipped

for

a

115-volt

input

(Option

026

for

Models

6259B,

6261

B,

and

6268B,

or

Option

016

for

the

Model

6260B).

In

addition,

all

five

models

are

available

in

a

50Hz

version.

The

input

voltage

and

frequency

required

is

marked

on

the

rear

panel

of

the

supply.

Except

for

the

Model

6269B,

which

cannot

be

converted

to

11

5-volt

operation,

a

standard

instrument

can

be

converted

by

the

user

to

208

or

11

5-volt

and

to

50Hz

operation

by

following

the

instructions

given

in

the

follow¬

ing

paragraphs.

The

standard

instrument

requires

the

input

current

and

power

listed

below

when

operated

at

full

load

from

a

230-volt

source.

When

the

supply

is

operated

from

a

115-volt

source,

the

input

current

is

approximately

twice

the

amount

listed.

Model

Input

Current

Input

Powe

6259B

6A

850W

6260B

12A

1600W

6261B

12A

1500W

6268B

12A

1600W

6269B

18A

2500W

2-17

INPUT

LINE

VOLTAGE

OR

FREQUENCY

CONVERSION

2-1

8

Converting

a

230-volt

instrument

to

208-volt

operation

is

simply

a

matter

of

changing

some

taps

or

jumper

connections

on

main

power

transformer

T1

and

bias

transformer

A3T2.

Converting

to

11

5-volt

operation

is

more

involved.

The

Models

6259B,

6260B,

6261

B,

and

6268B

require

an

added

resistor

and

some

jumper

changes

in

the

A2

RFI

assembly

and

a

changed

A3T2

transformer

tap.

In

addition,

the

6260B,

6261

B,

and

6268B

need

a

replacement

circuit

breaker,

and

the

6260B

needs

a

replace¬

ment

T1

power

transformer.

Complete

line

voltage

con¬

version

instructions

are

given

in

paragraphs

2-20

through

2-27.

2-19

Converting

a

60Hz

instrument

to

50Hz

operation

requires

that

one

resistor

be

replaced

and

some

adjustments

be

made.

Line

frequency

conversion

instructions

are

given

in

paragraph

2-28.

2-20

Converting

a

Standard

Instrument

to

208-

Volt

Operation

(Models

6259B,

6261B

and

6268B).

2-21

To

convert

these

230-volt

instruments

to

208-volt

operation,

proceed

as

follows:

a.

Disconnect

instrument

from

power

source

and

remove

top

and

bottom

covers.

b.

Remove

A2

RFI

assembly

as

described

in

steps

(a)

through

(c)

of

paragraph

5-65.

This

provides

access

to

bias

transformer

A3T2

(see

Fig.

7-2).

c.

Locate

the

wire

that

connects

circuit

breaker

CB1

to

the

A3T2

bias

transformer

terminal

marked

"230V”,

disconnect

it

from

the

transformer,

and

reconnect

it

to

the

terminal

marked

"208V".

Leave

the

wire

from

fan

B2

(not

used

in

the

6259B)

connected

to

the

terminal

marked

"230V"

(see

Fig.

2-2B).

d.

Re-install

the

RFI

assembly

by

reversing

the

proce¬

dure

of

step

(b)

above.

e.

Unsolder

the

wire

connected

to

terminal

5

of

power

transformer

T1

and

solder

it

instead

to

terminal

4

(see

Figure

2-3B).

2-22

Converting

a

Standard

Instrument

to

208-

Volt

Operation

(Models

6260B

and

6269B).

2-23

To

convert

these

230-volt

instruments

to

208-

volt

operation,

proceed

as

follows:

a.

Perform

steps

(a)

through

(d)

of

paragraph

2-21.

b.

Unsolder

the

wire

connected

to

the

terminal

marked

"230V"

on

power

transformer

T1

and

solder

it

instead

to

the

terminal

marked

"208V"

(see

Fig.

2-4B).

2-24

Converting

a

Standard

Instrument

to

115-

Volt

Operation

(Models

6259B,

6261B

and

6268B).

A

BIAS

TRANSFORMER

(A3T2)

CONNECTIONS

FOR

230

VOLT

OPERATION.

B

BIAS

TRANSFORMER

(A3T2)

CONNECTIONS

FOR

208

VOLT

OPERATION.

C

BIAS

TRANSFORMER

(A3T2)

CONNECTIONS

FOR

115

VOLT

OPERATION.

NOTE-

X

FAN

B2

IS

NOT

USED

IN

MODEL

62596

Figure

2-2.

Bias

Transformer

Primary

Connections

for

208Vac

Operation

(Modal

6259B,

6260B,

6261B,

6268B,

and

6269B)

and

115Vac

Operation

(except

Model

6269B).

2-2