HP 6826A Service manual

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BIPOLAR

POWER

SUPPLY/AMPLIFIER

MODELS

6826A

AND

6827A

Valuetronics

Internationa

1

-

8

0

0

-

OPERATING

AND

SERVICE

MANUAL

FOR

SERIALS

1317A-00101

AND

ABOVE*

*For

Serials

Above

1317A-00101

a

change

page

may

be

included.

HEWLETT-PACKARD

Part

No.

5950-1702

Printed:

November,

1974

SECTION

I

GENERAL

INFORMATION

1-1

DESCRIPTION

1-2

This

instruction

manual

contains

operating

and

service

instructions

for

two

Bipolar

Power

Supply/Amplifiers

(Models

6826A

and

6827A).

The

Bipolar

Power

Supply/

Amplifier

(BPS/A)

is

a

general

purpose

instrument

useful

in

any

laboratory

engaged

in

the

research

and

development

of

electronic

systems,

circuitry,

or

components.

The

BPS/A

can

be

operated

as

a

power

supply

or

as

an

amplifier.

Ter¬

minals

on

the

rear

terminal

strip

permit

access

to

various

in¬

ternal

control

points

to

further

expand

the

operational

cap¬

abilities

of

the

unit.

The

resulting

flexibility

lends

the

BPS/A

to

an

almost

unlimited

number

of

applications.

Some

of

these

applications

are

outlined

in

Section

ill

of

this

manual.

The

following

paragraphs

describe

some

of

the

features

of

the

BPS/A

as

a

power

supply

and

as

an

amplifier.

1-3

POWER

SUPPLY

FEATURES

1-4

The

unit

can

be

made

to

function

as

a

regulated

dc

power

supply

by

setting

the

front

panel

MODE

switch

to

the

POWER

SUPPLY

position.

The

supply

can

furnish

either

a

Constant

Voltage

output

or

Constant

Current

out¬

put.

The

dc

output

is

bi-polar

and

is

continuously

adjustable

from

its

maximum

rated

positive

value

to

an

equal

negative

continuously

through

zero.

A

crossover

feature

automati¬

cally

changes

the

supply

from

constant

voltage

to

constant

current

operation

at

a

preset

or

programmed

voltage/current

point.

The

front

pane!

CURRENT

MODE

indicator

lights

for

constant

current

operation.

Both

the

supply

and

the

load

are

protected

against

overvoltage

and

overcurrent

conditions

by

internal

circuits.

Dual

output

voltage

ranges

are

provided

for

better

resolution.

The

front

panel

RANGE

switch

allows

selection

of

the

high

(X10)

or

low

(XI)

output

range.

1-5

The

output

voltage

can

be

programmed

locally

using

the

front

panel

VOLTAGE

control,

or

remotely,

by

means

of

a

resistance

connected

to

the

appropriate

rear

ter¬

minals.

The

output

current

can

be

programmed

locally

us¬

ing

the

front

panel

CURRENT

control,

or

remotely,

by

means

of

a

resistance

or

voltage

source

connected

to

the

appropriate

rear

terminals.

The

BPS/A

can

be

programmed

(controlled)

at

a

very

high

rate

of

speed

(less

than

BOpsec

for

output

voltage

change

over

the

entire

voltage

span).

Local

and

remote

programming

connections

are

described

in

Section

III.

The

output

voltage

and

current

ranges

are

as

follows;

Model

6826A:

-5V

to

+5V

at

0

to

1.0A

(low

range)

--50V

to

+50V

at

0

to

1.0A

(high

range)

Model

6827A:

-10V

to

+10V

at

0

to

0.5A

(low

range)

-100V

to

+100V

at

0

to

0.5A

(high

range)

1-6

The

BPS/A

can

sink,

as

well

as

source

current,

per¬

mitting

it

to

serve

as

a

variable

load

device.

The

BPS/A

can

sink

up

to

50%

of

the

rated

output

current.

1-7

AMPLIFIER

FEATURES

1-8

The

unit

can

be

made

to

function

as

a

variable

gain

or

a

fixed

gain

amplifier

by

setting

the

MODE

switch

to

the

VAR

GAIN

AMP

or

FXD

GAIN

AMP

position.

When

oper¬

ating

as

an

amplifier,

the

BPS/A

can

amplify

externally

applied

ac

or

dc

signals.

Variable

gain

can

be

controlled

locally

(VOLTAGE

control)

or

remotely

and

is

accurate

to

0.1%.

The

variable

or

fixed

gain

provided

is

as

follows;

Model

6826A:

Variable

Gain

Fixed

Gain

Model

6827A:

Variable

Gain

Fixed

Gain

0-2

(low

range),

0-20

(high

range)

IX

(low

range)

10X

(high

range)

0-4

(low

range),

0-40

(high

range)

2X

(low

range),

20X

(high

range)

1-9

The

variable

gain

amplifier

is

non-inverting

and

has

a

frequency

response

from

dc

to

15kHz.

The

fixed

gain

amplifier

is

inverting

and

has

a

frequency

response

from

dc

to

40kHz

(6826A)

or

from

dc

to

30kHz

(6827A).

Total

harmonic

distortion

is

0.1%

(maximum).

1-10

METERS

1-11

A

voltmeter

and

an

ammeter

on

the

front

panel

monitor

the

ac

or

dc

output

voltage

and

current

respective¬

ly.

Associated

front

panel

VOLTAGE

METER

and

CUR¬

RENT

METER

switches

allow

the

meters

to

monitor

either

an

ac

or

dc

output

and

also

provide

dual

range

monitoring

capability

for

better

resolution.

The

dc

meter

accuracy

is

±3%

of

full

scale

and

the

ac

meter

accuracy

is

±5%

of

full

scale.

1-12

SPECIFICATIONS

1-13

Detailed

specifications

for

the

two

models

are

given

in

Table

1-1.

1-1

Table

1-1.

Specifications,

Models

6826A

and

6827A

NOTE

Specifications

apply

to

all

models

unless

otherwise

specified.

GENERAL

SPECIFICATIONS

Input

Power:

Model

6826A:

104-127/208-254Vac

(switchable),

48-63Hz,

1.0A,

130W

Model

6827A:

104-127/208-254Vac

(switchable),

48-63Hz,

1.2A,

150W

Meters:

Individual

voltage

and

current

meters.

DC

accuracy

is

3%

of

full

scale.

AC

accuracy

is

5%

full

scale

with

sinu¬

soidal,

100Hz

input.

Meter

Ranges

(DC):

M

o

del

6826

A

:

±6V,±60V

±0.12A,

±1.2A

Model

6827

A:

±12V,

±120V

±0.06A,

+0.6A

Meter

Ranges

(AC):

Model

6826A:

4V

(uncal),

40V

rms

0.08A

rms,

0.8A

rms

Model

6827A:

8V

(uncal),

80V

rms

0.04A

rms,

0.4A

rms

Temperature

Ratings:

Operating:

0

to

55°C.

Storage:

--40

to

+75°C,

Cooling:

Convection

cooling

is

employed.

The

supplies

have

no

moving

parts.

Dimensions:

See

outline

diagram.

Figure

2-1.

Weight:

18

lbs.

(8.2

kg.)

net,

21

lbs.

(9.5

kg.)

shipping.

POWER

SUPPLY

SPECIFICATIONS

DC

Output:

Voltage

and

current

spans

indicate

range

over

which

output

may

be

varied.

Model

6826

A

:

XI

Range:

—5V

to

+5V,

0

to

1.0A

X10

Range:

-BOV

to

+50V,

0

to

1.0A

DC

Output

(Continued):

Model

6827A:

XI

Range:

-10V

to+10V,

0

to

0.5A

X10

Range:

-100V

to

+100V,

0

to

0.5A

Load

Effect

(Load

Regulation):

Voltage

load

effect

is

given

for

a

load

current

change

equal

to

the

current

rating

of

the

supply.

Current

load

effect

is

given

for

a

load

voltage

change

equal

to

the

voltage

rating

of

the

supply.

Model

6826A:

Voltage

(XI

Range):

0.01%+.5mV

Voltage

(XI0

Range):

0.01%+

ImV

Current:

.01%

+

250/iA

Load

Effect

(Load

Regulation)

Continued:

Model

6827A:

Voltage

(XI

Range):

,01%

+

.3mV

Voltage

(X10

Range):

.01%+ImV

Current:

,01%

+

250

/kA

Source

Effect

(Line

Regulation):

For

a

change

in

line

voltage

between

104

and

127Vac/

208

and

254Vac

at

any

output

voltage

and

current

within

rating.

Model

6826A:

Voltage

(XI

Range):

.01%

+

.5mV

Voltage

(X10

Range):

.01%

+

5mV

Current:

.01%

+

250pA

Model

6827A:

Voltage

(XI

Range):

.01%+

ImV

Voltage

(XI0

Range):

.01%+10mV

Current:

.01%

+

250/uA

PARD

(Ripple

and

Noise):

Rms/p-p

(20Hz

to

20MHz)

at

any

line

voltage

and

under

any

load

condition

within

rating.

Model

6826A:

Voltage

(XI

Range):

2mV

rms/IGmV

p-p

Voltage

(X10

Range):

6mV

rm$/35mV

p-p

Current:

8mA

rms/5mA

p-p

Model

6827A:

Voltage

(XI

Range):

2.5mV

rms/15mV

p-p

Voltage

(X10

Range):

lOmV

rm$/50mV

p-p

Current:

.4mA

rms/5mA

p-p

1-2

Table

1-1.

Specifications,

Models

6826A

and

6827A

(Continued)

POWER

SUPPLY

SPECIFICATIONS

(Continued)

Model

6826A:

Temperature

Coefficient:

Voltage

(XI

Range):

lOmV

Voltage

(X10

Range):

lOOmV

Current:

3mA

Output

change

per

degree

Centigrade

change

in

am-

Model

6827A:

bient

following

30

minutes

warm-up.

Voltage

(XI

Range):

20mV

Model

6826A:

Voltage

(XI0

Range):

200mV

Voltage

(XI

Range):

,01%

+

.35mV

Current:

1.5mA

Voltage

(X10

Range):

.01%

+

3mV

Current:

.02%

+

50juA

Output

Impedance

(Typical

to

50kHz);

Mode!

6827A:

Approximated

by

a

resistance

in

series

with

an

indue-

Voltage

(XI

Range):

.01%

+

.7mV

tance

(constant

voltage

operation).

Voltage

(XI0

Range):

.01%

+

6mV

Model

6826A:

1m£2&1.5qH

Current:

.02%

+

50juA

Model

6827A:

2mft

&

4/uH

Drift

(Stability):

DC

Output

Isolation:

Supply

may

be

floated

at

up

to

300V

above

ground.

Change

in

output

(dc

to

20Hz)

over

8

hour

interval

under

constant

line,

load,

and

ambient

following

30

Remote

Resistance

Programming:

minutes

warm-up.

Mode!

6826A

(Resistance

Coefficient):

Model

6826A:

Voltage

(XI

Range):

2000H/V

±

.1%

Voltage

(XI

Range):

.03%

+

1

mV

(Pot

wiper

jump

Voltage

(XI0

Range):

200£2/V

±

.1%

effect

may

add

5mV)

Current:

10£2/mA

+

.1%

Voltage

(X10

Range):

.03%+

lOmV

(Pot

wiper

Model

6827A

(Resistance

Coefficient):

jump

effect

may

add

50mV)

Voltage

(XI

Range):

1000H/V

+

.1%

Current:

.1%

+

200;uA

(Pot

wiper

jump

effect

may

Voltage

(XI0

Range):

lOOft/V

±

.1%

add

1.5mA)

Current:

10£2/mA±.1%

Model

6827A:

Voltage

(XI

Range):

.03%

+

2mV

(Pot

wiper

jump

Remote

Programming

Speed:

effect

may

add

5mV)

50/isec

are

required

to

change

between

1%

and

99%

of

Voltage

(X10

Range):

.03%

+

20mV

(Pot

wiper

the

maximum

+

and

—

voltage

limits.

jump

effect

may

add

lOOmV)

Current:

.1%

+

200,uA

(Pot

wiper

jump

effect

may

Remote

Programming

Temperature

Coefficient:

add

1mA).

Output

change

per

degree

Centigrade

change

in

am-

Load

Effect

Transient

Recovery

(Load

Transient

bient

using

an

external

control

resistor

(Rp)

at

output

voltage

(Vo)

or

current

(lo)-

%

T.C.

Rp

is

the

tern-

Recovery):

perature

coefficient

of

the

control

resistance

Rp.

Time

required

for

output

voltage

recovery

to

within

Model

6826A:

the

specified

level

of

the

nominal

output

voltage

Voltage

(XI

Range):

,25mV

+

.007%

(Vo)

+

following

a

change

in

output

current

equal

to

the

%

T.C.

Rp

(Vo

+

5}

current

rating

of

the

supply.

Voltage

(X10

Range):

2.2mV

+

.007%

(Vo)

+

Model

6826A:

%

T.C.

R

F

(V

0

+

50)

IQOpsec

is

required

for

output

voltage

recovery

Current:

.016%

(Iq)

+

33pA

+

%

T.C.

Rp

(l

0

)

within

50mV

of

nominal

output

voltage.

Model

6827A:

100/usec

is

required

for

output

voltage

recovery

Model

6827A:

within

lOOmV

of

nominal

output

voltage.

Voltage

(XI

Range):

,5mV

+

.007%

(Vq)

+

Resolution:

%

T.C.

Rp

(Vq

+

10)

Voltage

(X10

Range):

4mV

+

.007%

(Vo)

+

Typical

output

voltage

or

current

change

that

can

be

%

T.C.

Rp

(Vq

+

100)

obtained

using

front

panel

controls.

Current:

.016%

(Iq)

+

33/tA

+

%

T.C.

Rp

(Iq)

1-3

Table

1-1.

Specifications,

Models

6826A

and

6827A

(Continued)

POWER

SUPPLY

SPECIFICATIONS

(Continued)

Sink

Current

Compliance:

Maximum

current

that

the

supply

can

sink

when

con¬

nected

to

an

active

load.

Model

6826A:

Sink

current

is

limited

to

a

value

ranging

linearly

from

1A

@

OV

to

.5A

@

50V.

Externally

applied

voltages

to

output

terminals

in

excess

of

GOV

could

damage

the

instrument.

Model

6827A:

Sink

current

is

limited

to

a

value

ranging

linearly

from

,5A

@

0V

to

.25A

@

100V.

Externally

applied

voltages

to

output

terminals

in

excess

of

125V

could

damage

the

instrument.

POWER

AMPLIFIER

SPECIFICATIONS

Output:

Mode

l

6826A:

Voltage

(XI

Range):

10V

p-p

Voltage

(XI0

Range):

100V

p-p

Current:

1A

peak

Model

6827A:

Voltage

(XI

Range):

20V

p-p

Voltage

(X10

Range):

200V

p-p

Current:

,5A

peak

Voltage

Gain

(High/Low

Range):

Model

6826A:

Fixed

Amplifier

(Inverting):

10X

(high

range)/

1X(iow

range)

Variable

Gain

(Non-inverting):

0-20

(high

range)/

0-2

(low

range)

Model

6827A:

Fixed

Amplifier

(Inverting):

20X

(high

range)/

2X

(low

range)

Variable

Gain

(Non-Inverting):

0-40

(high

range)/

0-4

(low

range)

Frequency

Response

(+1,

—3dB

at

full

output):

Model

6826

A

:

Fixed

Gain:

dc

—

40kHz

Variable

Gain:

dc—15kHz

Model

6827A:

Fixed

Gain:

dc

—30kHz

Variable

Gain:

dc—15kHz

Distortion:

Total

harmonic

distortion

is

.1%

(maximum)

at

100

Hz

and

full

output.

Input

Impedance:

lOKfi

(Typical)

Fixed

Gain

Accuracy

(at

100Hz):

Model

6826A:

Low

Range

(XI):

.1%

+

.5mV

High

Range

(X10):

.1%

+

5mV

Model

6827A:

Low

Range

(XI):

,1%+lmV

High

Range

(X10):

.1%+10mV

Remote

Resistance

Programming

Variable

Gain

{Ay):

KR

f

Ay

~

-

—

———

-

f

where

K

is

the

constant

indi-

10.24

x

1

0

°

i2

cated

and

R

p

is

the

external

control

resistance.

Model

6826A:

R

c

Ay

at

low

range

(XI):-——

10.24

x

10

3

10

R

f

Ay

at

high

range

(X10):-

10.24

x

10

3

Model

6827A:

.

2R

Ay

at

low

range

(XI):

.-

—

10.24

x

I

O

3

,

^

20

R

f

Ay

at

high

range

(XI0):

.

——-

10.24

x

10

3

Table

1-1.

Specifications,

Mode!

s6826A

and

6827A

{Continued)

Variable

Accuracy:

Accuracy

in

high

range

at

100Hz

using

an

external

control

resistance

(Rp)

at

output

voltage

(Vo)-

%

Rp

is

the

accuracy

of

the

control

resistance

Rp.

Model

6826A:

(.05%

+

%R

F

)

V

0

+

5mV

Model

6827A:

(.05%

+

%Rp)

Vo

+

10mV

Remote

Voltage

Control

Coefficient:

Fixed

gain

amplifier

mode,

voltage

coefficient:

Model

6826A:

Voltage

(XI

Range):

1

volt/volt

±

.1%

Voltage

(X10

Range):

10

volts/volt

±

.1%

Model

6827A:

Voltage

(XI

Range):

2

volts/volt

±

.1%

Voltage

(X10

Range):

20

volts/volt

±

.1%

Constant

Current,

voltage

coefficient

(the

following

applies

to

variable

gain

amplifier,

fixed

gain

amplifier,

and

power

supply

modes

of

operation):

Models

6826A

and

6827A:

1

ampere/volt

±

.5%

1-14

OPTIONS

1-15

Options

are

customer-requested

factory

modifica¬

tions

of

a

standard

instrument.

The

option

described

below

applies

to

Models

6826A

and

6827A.

Option

No

.

Description

007

Ten-turn

Output

Voltage

Control:

Replaces

standard

single-turn

voltage

control

to

allow

greater

resolution

in

setting

the

output

volt¬

age

ir

gain

of

the

BPS/A.

Shunt

resistor

A1

R53

as

well

as

standard

VOLTAGE

con¬

trol

(HP

Part

No.

2100-3272)

A5R2

must

be

removed

when

the

ten-turn

output

volt¬

age

control

(HP

Part

No.

2100-1867)

is

in¬

stalled

in

the

A5R2

location.

1-16

ACCESSORIES

1-17

The

accessories

listed

in

the

following

chart,

may

be

ordered

with

the

instrument

or

separately

from

your

local

Hewlett-Packard

sales

office

(refer

to

list

at

rear

of

manual

for

addresses).

HP

Part

No.

5060-8762

5060-8760

11057A

1052A

Dual

Rack

Adapter:

Kit

for

rack

mounting

one

or

two

supplies

in

standard

19-inch

rack.

Blank

Panel:

Filler

panel

to

block

unused

half

of

rack

when

mounting

only

one

supply.

Carrying

handle

easily

attached

for

portabil¬

ity

and

handling

convenience.

Combining

Case

for

mounting

one

or

two

units

in

standard

19-inch

rack.

5060-0789

Cooling

kit

for

above

combining

case,

115

Vac,

50-60Hz.

5060-0796

Cooling

kit

for

above

combining

case,

230

Vac,

50-60Hz.

1-18

INSTRUMENT

IDENTIFICATION

1-19

Hewlett-Packard

power

supplies

are

identified

by

a

three-part

serial

number.

The

first

part

is

the

power

supply

model

number.

The

second

part

is

the

serial

number

prefix,

consisting

of

a

number-letter

combination

denoting

the

date

of

a

significant,

design

change

and

the

country

of

manufac¬

ture.

The

first

two

digits

indicate

the

year

(12

=

1972,

13

=

1973,

20

-

1980,

etc);

the

second

two

digits

indicate

the

week

(01

through

52);

and

the

letter

"A",

"G",

"J",

or

"U"

designates

the

U.S.A.,

West

Germany,

Japan,

or

the

United

Kingdom,

respectively,

as

the

country

of

manufacture.

The

third

part

is

the

power

supply

serial

number;

a

different

5-

digit

sequential

number

is

assigned

to

each

power

supply,

starting

with

00101.

1-20

If

the

serial

number

prefix

on

your

unit

does

not

agree

with

the

prefix

on

the

title

page

of

this

manual,

change

sheets

supplied

with

the

manual

or

manual

backdating

changes

in

Appendix

A

define

the

differences

between

your

instrument

and

the

instrument

described

by

this

manual.

1-21

ORDERING

ADDITIONAL

MANUALS

1-22

One

manual

is

shipped

with

each

instrument.

Add¬

itional

manuals

may

be

purchased

from

your

local

Hewlett-

Packard

field

office

(see

list

at

rear

of

this

manual

for

add¬

resses).

Specify

the

model

number,

serial

number

prefix,

and

HP

part

number

shown

on

the

title

page.

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

received,

proceed

as

instructed

in

the

following

paragraphs.

2-3

MECHANICAL

CHECK

2-4

If

external

damage

to

the

shipping

carton

is

evident,

ask

the

carrier's

agent

to

be

present

when

the

instrument

is

unpacked.

Check

the

instrument

for

external

damage

such

as

broken

controls

or

connectors,

and

dents

or

scratches

on

the

panel

surfaces,

if

the

instrument

is

damaged,

file

a

claim

with

the

carrier's

agent

and

notify

your

local

Hewlett-Packard

Sales

and

Service

Office

as

soon

as

possible

(see

list

at

rear

of

this

manual

for

addresses).

2-5

ELECTRICAL

CHECK

2-6

Check

the

electrical

performance

of

the

instrument

as

soon

as

possible

after

receipt.

Section

V

of

this

manual

contains

performance

check

procedures

which

will

verify

in¬

strument

operation

within

the

specifications

stated

in

Table

1-

1

.

This

check

is

also

suitable

for

incoming

quality

control

inspection.

Refer

to

the

inside

front

cover

of

the

manual

for

the

Certification

and

Warranty

statements.

2-

7

REPACKAGING

FOR

SHIPMENT

2-8

To

insure

safe

shipment

of

the

instrument,

it

is

recommended

that

the

package

designed

for

the

instrument

be

used.

The

original

packaging

material

is

reusable.

If

it

is

not

available,

contact

your

local

Hewlett-Packard

field

office

to

obtain

the

materials.

This

office

will

also

furnish

the

add¬

ress

of

the

nearest

service

office

to

which

the

instrument

can

be

shipped.

Be

sure

to

attach

a

tag

to

the

instrument

speci¬

fying

the

owner,

model

number,

full

serial

number,

and

ser¬

vice

required,

or

a

brief

description

of

the

trouble.

2-9

INSTALLATION

DATA

2-10

The

instrument

is

shipped

ready

for

bench

opera¬

tion.

It

is

necessary

only

to

connect

the

instrument

to

a

source

of

power

and

it

is

ready

for

operation.

2-11

LOCATION

2-12

This

instrument

is

convection

cooled.

Sufficient

space

should

be

allotted

so

that

a

free

flow

of

cooling

air

can

reach

the

top

and

rear

of

the

instrument

when

it

is

in

operation.

It

should

be

used

in

an

area

where

the

ambient

temperature

remains

between

0°C

and

+55°C.

2-13

OUTLINE

DIAGRAM

2-14

Figure

2-1

illustrates

the

outline

shape

and

dimen¬

sions

of

Models

6826A

and

6827A.

2-15

RACK

MOUNTING

2-16

The

Mode!

6826A

and

6827A

BPS/A's

may

be

rack

mounted

using

either

the

dual

rack

adapter

kit

or

the

com¬

bining

case

(with

appropriate

cooling

kit)

described

in

Para¬

graph

1-16.

The

necessary

installation

instructions

are

pro¬

vided

with

the

accessories.

Refer

to

Paragraph

5-91

before

proceeding

with

the

rack

mounting

installation

instructions.

2-1

2-17

INPUT

POWER

REQUIREMENTS

2-18

Models

6826A

and

6827A

may

be

operated

contin¬

uously

from

either

a

nominal

120

volt

or

240

volt,

48-63

Hz

power

source.

A

two-position

selector

switch

{

|

)

loca¬

ted

within

the

a-c

power

module

on

the

rear

panel

selects

the

power

source.

Before

connecting

the

instrument

to

the

power

source,

check

that

the

selector

switch

setting

matches

the

nominal

line

voltage

of

the

source.

If

required,

move

the

switch

to

the

other

position.

Note

that

the

power

cable

must

be

removed,

the

plastic

door

on

the

power

module

must

be

moved

aside,

the

fuse

extractor

must

be

pulled

out¬

ward

and

the

fuse

must

be

removed

in

order

to

gain

access

to

the

selector

switch.

2-19

When

the

instrument

leaves

the

factory,

the

proper

fuse

is

installed

for

115

volt

operation.

An

envelope

con¬

taining

a

fuse

for

230

volt

operation

is

attached

to

the

instru¬

ment.

Make

sure

that

the

correct

fuse

is

installed

if

the

position

of

the

slide

switch

is

changed

(2A

for

115

volt

op¬

eration,

and

1A

for

230

volt

operation).

2-20

POWER

CABLE

2-21

To

protect

operating

personnel,

the

National

Elec¬

trical

Manufacturers'

Association

(NEMA)

recommends

that

the

instrument

panel

and

cabinet

be

grounded.

This

instru¬

ment

is

equipped

with

a

three

conductor

power

cable.

The

third

conductor

is

the

ground

conductor

and

when

the

cable

is

plugged

into

an

appropriate

receptacle,

the

instrument

is

grounded.

The

offset

pin

on

the

power

cable's

three-prong

connector

is

the

ground

connection.

2-22

To

preserve

the

protection

feature

when

operating

the

instrument

from

a

two-contact

outlet,

use

a

three-prong

to

two-prong

adapter

and

connect

the

green

lead

on

the

adapter

to

ground.

2-2

SECTION

ill

DERATING

INSTRUCTIONS

Figure

3-1.

Bipolar

Power

Supply/Amplifier,

Models

6826A

and

6827A,

Rear

View

3-1

INTRODUCTION

3-2

This

section

describes

the

operating

controls

and

indicators,

the

turn-on

checkout

sequence,

and

operating

modes

of

Bipolar

Power

Supply/Amplifier

(BPS/A)

models

6826A

and

6827A.

Local

and

remote

programming

opera¬

tions

are

also

described.

3-3

REAR

TERMINALS

AND

AC

INPUT

3-4

The

Bipolar

Power

Supply/Amplifier

(BPS/A)

is

shipped

with

the

rear

terminals

strapped

for

local

program¬

ming

(using

front

pane!

controls)

as

shown

in

Figure

3-1.

Remote

programming

strapping

requirements

are

described

in

subsequent

paragraphs.

The

power

module

contains

fuse

FI

(2A

for

115Vac

or

1A

for

230Vac)

and

a

slide

switch

for

connecting

115Vac

or

230Vac

input

power

to

the

instru¬

ment.

To

turn

on

the

BPS/A,

set

the

LINE

switch

(item

(T)

,

Figure

3-2)

to

ON.

The

LINE

ON

indicator

(2)

should

light.

Fuse

FI

protects

the

main

power

supply.

At

initial

turn-on,

an

interna!

circuit

protects

any

loads

con¬

nected

to

the

BPS/A

from

turn-on

transients

by

shorting

the

output

terminals

and

disabling

the

BPS/A's

power

out¬

put

circuits.

This

circuit

operates

similarly

at

turn-off

to

protect

any

loads

from

turn-off

transients.

3-5

OPERATING

CONTROLS

AND

INDICATORS

3-6

MODE

SWITCH

3-7

The

MODE

switch

@

allows

the

BPS/A

to

oper

ate

as

a

power

supply,

variable

gain

amplifier,

or

a

fixed

gain

amplifier.

In

the

power

supply

operation,

the

BPS/A

pro¬

vides

a

variable

bipolar

dc

output

voltage

dependent

upon

the

RANGE

switch

(4)

and

VOLTAGE

control

(§)

settings.

The

dc

output

voltage

ranges

are

as

follows:

3-1