POWER DESIGNS 3K10 Manuel utilisateur

-I-l

MODEL

3K10

HIGH

VOLTAGE

PRECISION

POWER

SOURCE

50

-

3,000

VDC

SERIAL

NU^mER

^/no

n/

The

Model

3K10

Laboratory

Power

Source

is

ideally

suited

for

operating

photomultipiier

tubes,

small

high-resolution

CRT

displays

and

other

devices

which

require

criticaily-stable,

noise-free

DC

power.

This

compact,

solid-state

supply

achieves

high

efficiency

and

reduced

size

through

the

use

of

new

high-frequency

technology.

A

novel

bail-handle

assembly

permits

the

front

panei

to

tilt

for

optimum

viewing

angle

and

control.

ELECTRICAL

CHARACTERISTICS

Input:

103-129

VAC,

47-440

Hz,

60

Watts.

Output:

Continuously

adjustable

between

50

and

3,000

VDC

at

0

-

10

milliamperes.

Stability:

The

Model

3K10

has

less

than

100

ppm

output

voltage

drift

per

hour

and

less

than

300

ppm

drift

per

24

hours

under

constant

load,

line

voltage

and

ambient

temperature

after

warm-up

(above

200

VDC).

Noise

and

Ripple:

10

millivolts

peak-to-peak

to

500

KHz.

Regulation:

0.001%

or

3

millivolts

(whichever

is

greater)

for

line

or

load

variations

within

the

operating

range.

Calibration

Accuracy:

0.25%

of

switch

settings

above

500

VDC;

0.5%

of

switch

settings

above

200

VDC;

typically

5%

above

50

VDC.

Resettability:

0.03%

or

0.1

volt

(whichever

is

greater)

in

any

24-hour

period.

Resolution:

25

millivolts

(fine

adjustment

potentiometer).

Temperature

Coefficient:

Less

than

50

ppm/°C

change

in

output

voltage

after

warmup.

Operating

Temperature

Range:

Continuous

duty

at

full

load

from

0°C

to

50°C.

^

high

voltage

AOWffi

SOOACE

•

}

2500

2000.

"

'00

H

.

«

POWER

DESIGNS

PACIFIC

PALO

ALTO

CALIFORNIA

Wf

SI

BURY,

NEW

YORK

FEATURES

Voltage

Controls:

The

Model

3K10

features

a

precision

calibrated

voltage

divider

which

provides

0-

2,500

volts

in

five

500-volt

steps;

0

-

400

voits

in

four

100

volt

steps;

and

0-100

volts

continuous

fine

adjustment

by

means

of

a

10-turn

potentiometer.

Protection:

Fast-acting

electronic

overload

and

short-circuit

protection

permits

the

Model

3K10

power

source

to

operate

into

a

short

circuit

or

overload

with

automatic

restoration

upon

fault

clearance.

Polarity

Reversing:

A

polarity

reversal

switch

located

on

the

rear

of

the

Model

3K10

permits

operation

with

either

positive

or

negative

output

terminal

at

ground

potential.

Output

Terminals:

Positive

or

negative

DC

output

is

supplied

from

two

standard

BNC

"safety"

high-voltage

receptacles

located

on

the

rear

chassis

surface

of

the

3K10.

POWER

DESIGNS

PACIFIC,

INC.

MIRANDA

AVE.,

PALO

ALTO,

CALIFORNIA

94304

POWER

DESIGNS,

INC.

1700

SHAMES

DRIVE

•

WESTBURY,

N.

Y.

11590

MODEL

3K1G

MECHANICAL

SPECIFICATIONS

Dimensions:

3"x

81/2

"x111/2".

Weight:

9

lbs.

Available

Options:

Overvoltage

protection.

Remote

resistance

or

voltage

programming.

Mounting:

Two

Model

3K10

units

may

be

mounted

in

a

3V2"

high

rack

adapter

designed

for

standard

19"

EIA

mounting.

Available

adapters

include:

RRG-4—Mounts

one

3K10

centered

$17.50

RRG-5—Mounts

two

3K10

units

$17.50

RRG-6—Mounts

one

3K10

on

right

or

left

side

$19.50

Finish:

Brushed,

anodlzed

aluminum

panel

with

etched

black

lettering.

Dust

cover

finished

in

attractive

blue

vinyl.

Price:

$390.00

FOB

Westbury,

New

York.

^.I73DIA.

(4-

HOLES)

(7

C7

I

/.500—I

POWER

DESIGNS

PACIFIC,

INC.

MIRANDA

AVE.,

PALO

ALTO,

CALIFORNIA

94304

COVER

(TOP

4

BOrrOM)

Z.6

70

POWER

DESIGNS,

INC.

1700

SHAMES

DRIVE

•

WESTBURY,

N.

Y.

11590

4

2

1

N

D

A

POWER

SUPPLY

MODEL

3K10

The

Schematic

Diagram

is

modified

as

follows;

1.

DS-4

is

wired

from

33

to

36

on

the

PE-310

block.

2.

Choke

L4

is

wired

between

0-102

and

3007-D

blocks

and

the

output

connectors.

3.

Q13

is

part

number

MJ421.

910

■c.'O

onrhn

'

A/7

f

C':-

tr.hry-

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..

i

•

"'■

;

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t'

i'":

R.iC;n>-

i'.

!

.

!yo'''*/r

'.hiu.

■-•'

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"*•

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'if

T)

T:

w

HIGH

VOLTAGE

POWER

SOURCE

MODEL

3K10

SECTION

1

DESCRIPTION

1-1.

GENERAL

,

The

Model

3K10

is

an

imusually

compact,

all

solid

state

labor-

power

source

with

^

output

continually

adjustable

from

50

to

3000

Vpc

at

0

to

10

milliamperes.

High

efficiency

and

size

reduction

are

achieved

through

the

use

of

new

high

frequency

technology.

^^0

Model

3K10

is

ideally

suited

for

applications

requiring

stable,

noise-free

DC

for

photomultiplier

tubes

and

small,

high

resolution

CRT

displays.

The

unit

is

housed

in

a

compact

cabinet

with

carrying

handle

and

bail

combination

to

tilt

the

front

panel

for

viewing

and

control

ease.

1-2.

ELECTRICAL

SPECIFICATIONS

Table

1

lists

the

electrical

specifications

of

the

Model

3K10.

1-3.

MECHANICAL

SPECIFICATIONS

Dimensions;

3"

x

8-|"

x

11^"

Weight:

g

its.

Finish:

Brushed

anodized

aluminum

panel

with

etched

black

lettering.

Dust

cover

finished

in

blue

vinyl.

Bail:

a

bail

at

the

bottom

front

portion

can

be

extended

j

lift

the

front

of

the

3K10

for

viewing

and

control

ease.

The

bail

when

extended

may

also

be

used

as

a

carrying

handle.

Mounting:

Two

units

may

be

mounted

in

a

3i"

high

rack

adapter

for

standard

19"

EIA

mounting.

901

1-1

TABLE

1

Parameter

Input

Output

Regulation

Noise

and

Ripple

Stability

Calibration

Aoburacy

Resettability

Resolution

Voltage

Controls

Temperature

Cofefficient

Operating

Temperature

Output

Terminals

Polarity

Reversing

Switch

Protection

3K10

ELECTRICAL

SPECIFICATIONS

Value

103

to

129

volts,

47

to

440

Hz,

50

watts

nominal

Continuously

adjustable

from

50

to

3000

volts

at

0

to

10

milliamperes

O.OOIfo

or

3

millivolts

(whichever

is

the

greater)

for

line

or

load

variations

with-

.

in

the

operating

range

10,millivolts

peak-to-peak,

to

500

KHz

Less

than

100

ppm

drift

in

output

voltage

per

hour;

less

than

300

ppm

per

24

hours

vinder

constant

load,

line

voltage

and

ambient

temperature

after

warm-up

(above

200

VDC)

0.25^

of

switch

settings

above

500

VDC:

0.5%

of

the

switch

settings

above

200

VDC

0.03%

or

0.1

volt

(whichever

is

greater)

in

any

24-hour

period

25

millivolts

(fine

adjustment

potentiometer)

Precision

calibrated

voltage

divider

0

to

2500

volt'j

in

five

500

volt

steps;

0

to

400

volts

in

four

100

volt

steps;

0

to

100

volts

(minimum

range)

fine

adjustment

by

means

of

a

10-turn

potentiometer

with

a

calibrated

dial.

Less

than

50

ppm

per

°C

change

in

output

voltage

after

warm-up

Continuous

duty

full

load

from

0

to

50°C

Two

BNC

"safety"

high

voltage

receptacles

on

rear

chassis

surface

Reversing

switch

on

rear

of

power

supply

permits

operation

with

either

positive

or

negative

terminal

at

ground

potential.

Past-acting

electronic

overload

and

short-

circuit

protection

permits

operation

into

a

short

circuit

with

automatic

restoration

upon

fault

clearance.

901

1-2

BldO

SECTION

2

INSTALLATION

AND

OPERATION

2-1.

INSTALLATION

The

Model

3K10

may

be

operated

on

a

bench,

or

two

units

may

be

mounted

in

a

3i"

high

rack

adapter

for

standard

19"

EIA

mounting.

2-2.

OPERATION

To

place

the

supply

in

service,

the

POTOR

ON

switch

should

be

set

to

the

"off"

position,

and

the

supply

connected

to

a

source

of

AC

power

of

the

correct

voltage

and

frequency

rating.

The

reversing

switch

on

the

rear

surface

of

the

unit

should

be

set

for

the

desired

polarity.

The

screwdriver

slot

on

the

shaft

points

to

the

output

polarity.

The

two

front

panel

rotary

switches

and

a

ten-turn

vernier

potentiometer

control

the

output

voltage.

The

output

voltage

is

the

sum

of

the

switches

and

vernier

settings.

The

PQiiVER

ON

switch

may

now

be

set

to

the

ON

position.

The

pilot

light

will

come

on

and

high

voltage

will

appear

at

the

output

of

the

supply.

CAUTION:

BECAUSE

OP

THE

HIGH

VOLTAGES

WHICH

THIS

POVfflR

SUPPLY

CAN

PRODUCE,

ALWAYS

OPERATE

THE

POWER

SUPPLY

WITH

A

THREE-WIRE

LINE

CORD,

OR

V/ITH

A

SOLID

GROUND

CONNECTION

TO

THE

CASE.

To

reverse

the

output

polarity,

turn

off

the

POWER

ON

switch,

wait

30

seconds

for

the

output

voltage

to

decay,

turn

the

reversing

switch

to

the

desired

polarity,

then

turn

the

POWER

ON

switch

back

on.

The

polarity

reversal

switch

should

not

be

operated

with

high

voltage

A

fast—acting

electronic

overload

and

short

circuit

protection

system

permits

indefinite

operation

into

a

short

circuit

with

auto

matic

restoration

upon

fault

clearance.

This

protection

system

operates

at

output

load

currents

of

13

milliampercs

nominal.

When

operation

is

attempted

below

50

volts,

the

output

voltage

abruptly

drops.

Regulation

in

this

region

is

uncertain.

The

nature

of

the

power

supply

regulator

is

such

that

high

frequency

switching

transients

appear

across

the

output

terminals.

These

transients

are-

fast

rise

pulses

in

the

order

of

a

microsecond

Ja

and

are

30

to

50

millivolts

peak-to-peak

amplitude

in

a

50

MHz

system.

901

2-1

3K10

SECTION

3

THEORY

OP

OPERiiTION

3-1.

GENERAL

The

Model

3K10

contains

two

separate

regulating

loops;

one

a

fast

regulator

of

the

conventional

series

pass

transistor

type;

the

other

a

pre-regulator

which

operates

to

hold

the

voltage

across

the

/

'

series

pass

transistor

constant

and

in

its

operating

range.

The

sub-assemblies

making

up

the

Model

3K10

are

encapsulated

in

a

series

of

epoxy

modules

to

minimize

corona

noise

and

provide

high

voltage

isolation

as

well

as

environmental

protection.

Since

the

power

supply

is

made

up

of

physically

separate

modules,

the

oper

ation

of

the

unit

will

be

described

in

terms

of

the

function

of

each

module.

3-2.

AUXILIARY

POVffiR

SUPPLY

This

section,

consisting

of

the

AS-OIA

module,

powered

by

trans

former

T1,

produces

bias

voltages

for

the

control

circuitry.

The

outputs

from

this

section

are:

+40

volts

(unregulated):

3

+20

volts

4

+15

volts

5

-20

volts

7

-10

volts

8

-

5

volts

9

3-3.

FEEDBACK

DIVIDER

This

is

a

voltage

divider

in

the

fast

regulator

loop

which

senses

the

regulated

output

voltage,

compares

it

with

a

reference

voltage,

and

feeds

an

error

signal

to

the

regulator.

The

high

voltage

end

of

this

divider

is

in

the

PB-01

block.

The

resistors

in

this

block

are

temperature

compensated.

The

low

voltage

end

of

the

divider

is

made

up

of

resistors

R21

vernier

potentiometer

R36.

These

low

temperature

coefficient

precision

wirewound

resistors

are

switched

in

and

but

of

the

circuit

by

means

of

the

front

panel

voltage

selector

switches.

Trimmer

potentiometer

R37

provides

a

small

voltage

adjustment

for

use

in

calibrating

the

power

supply.

3-4.

ERROR

AMPLIFIER

i

•

•.

This

is

a

two-stage

DC

amplifier

housed

in

modules

EA-01

(first

stage)

and

AA-01

(second

stage).

The

input

to

the

amplifier

is

derived

from

the

feedback

divider

and

an

AC

feedback

capacitor

(FB-01

block).

The

output

feeds

the

series

pass

transistor

in

such

a

manner

as

to

maintain

the

regulated

output

voltage

and

degenerate

output

noise

and

ripple.

901

3_1

3K10

3-5.

PASS

ELEEffiNT

Series

pass

transistor

013

is

mounted

externally

on

the

PE-310

module.

This

series

element

acts

as

a

variable

resistance

in

series

with

the

output

of

the

power

supply.

As

line

or

load

vary,

the

re

sistance

of

this

series

element

is

changed

electronically

to

hold

the

regulated

output

voltage

constant.

The

PE-310

module

also

contains

a

current

limiter,

which

limits

the

output

current

from

the

supply

to

13

milliamperes

(nominal)

under

^y

overload

condition,

including

a

short

circuit.

The

cur

rent

limiter

is

self-restoring,

so

that

the

power

supply

automatically

resumes

normal

operation

upon

removal

of

the

overload.

3-6.

PRE-REGULATOR

The

high

voltage

input

to

the

fast

regulator

is

generated

by

a

duty

cycle

controlled,

inverter

operating

at

about

4.5

KHz.

The

duty

cycle

of

the

inverter

is

controlled

by

the

PR-OIA

pre-regulator

module

which

senses

the

collector-emitter

voltage

of

the

series

pass

transistor

to

hold

it

constant

at

approximately

25

volts.

The

PR-OIA

pre-regulator

develops

drive

signal

for

the

inverter

power

transistors

Q2

and

Q3.

The

IV-101

module

rectifies

the

incoming

AC

line

to

provide

appropriate

DC

voltages

for

the

operation

of

the

inverter

power

transistors.

These

power

transistors

operate

on

DC

potentials

derived

directly

from

the

AC

power

line.

No

isolation

transformer

IS

employed

in

order

to

obtain

maximum

efficiency

and

minimum

weight

and

size.

Isolation

is

achieved

by

driving

these

transistors

from

transformer,

2001-H,

and

high

voltage

output

transformer,

JK—1001•

3-7.

LINE

FILTER

This

is

contained

in

the

3021C

module

and

is

intended

to

keep

transients

generated

in

the

inverter

section

from

feeding

back

into

the

AC

line.

This

filter

reduces

the

noise

level

to

less

than

1

millivolt

rms.

3-8.

OUTPUT

FILTER

This

is

housed

in

the

0102

module.

It

provides

energy

storage

on

the

output

of

the

supply

and

also

acts

as

a

filter

to

reduce

the

output

noise

and

ripple.

901

3_2

3K10

SECTION

4

IMINTENANCE

4-1.

GENERAL

All

maintenance

and

adjustments

should

be

made

with

the

power

supply

set

for

negative

output.

Most

of

the

low-level

regulation

circuits

are

tied

electrically

to

the

positive

output

bus.

Setting

the

supply

for

negative

output

brings

most

of

these

circuits

close

to

groxmd

potential.

4-2.

CALlBRilTlON

To

check

or

reset

the

calibration

of

the

unit,

the

power

supply

should

be

set

for

negative

output

and

the

voltage

selector

switches

set

for

2900

volts

out,

with

the

vernier

control

at

its

minimum

setting.

The

output

of

the

supply

should

be

connected,

through

an

appropri

ate

voltage

divider,

to

the

input

of

a

differential

or

digital

voltmeter

of

accuracy

0,1

fo

or

better.

Allow

the

supply

to

warm

up

for

10

minutes

or

more,

then

adjust

potentiometer

R37,

if

necessary,

until

the

output

voltage,

as

measured

on

the

external

meter,

agrees

with

the

selector

switch

settings

to

within

0.25^.

The

same

measuring

setup,

may

be

used

to

check

the

calibration

of

the

unit

at

other

output

voltages

and

the

tracking

of

the

vernier

control.

4-3.

LO/O)

REGULATION

To

adjust

load

regulation,

set

the

power

supply

for

negative

polarity

and

500

volts

output.

Monitor

the

output

voltage

by

means

of

a

differential

voltmeter.

Adjust

trimmer

potentiometer

R63,

if

necessary,

until

the

change

in

output

voltage

upon

application

or

removal

of

a.

10

milliampere

load

is

less

than

O.OOI^

or

3

millivolts

(load

regu

lation

can

generally

be

set

considerably

closer

than

this).

Load

regulation

should

also

be

checked

at

3

KV

output,

but

will

usually

be

well

within

specifications

at

this

voltage

level

if

it

has

been

cor

rectly

set

at

500

volts.

CAUTION:

THE

lV-101

BLOCK,

THE

TRANSISTORS

ON

THE

HEAT

SINK

AND

THE

PRIMARY

OF

T2

AND

THE

SECONDARY

OF

T3

ARE

OPERATED

DIRECTLY

'FROM

THE

LINE,

WITHOUT

AN

ISOLATION

TRANSFORIffiR.WHEN

SER

VICING

OR

TROUBLESHOOTING

THIS

SECTION

OF

THE

CIRCUIT,

THE

POWER

SUPPLY

SHOULD

BE

OPERATED

FROM

A

1;1

ISOLATION

TRANS-

FORT,lER

FOR

PERSONNEL

SAFETY

AND

TO

PREVENT

DAMAGE

TO

THE

IPOmR

SUPPLY.

DANGEROUS

POTENTIALS

T.5AY

EXIST

INSIDE

THIS

POWER

SUPPLY.

CAPACITORS

MAY

HOLD

THEIR

CHARGE

FOR

SOTIE

TIME

AFTER

THE

UNIT

HAS

BEEN

TURNED

OFF.

TAKE

ALL

PRECAUTIONS

NORMALLY

USED

IN

WORKING

ON

HIGH

VOLTAGE

EQUIPMENT

WHEN

SERVICING

THIS

SUPPLY,

IN

THE

POSITIVE

OUTPUT

POLARITY

POSITION

CONTROL

CIRCUITS

AND

SEMICONDUCTORS

ARE

OPERATING

AT

HIGH

VOLTAGE

AND

DANGEROUS

POTENTIALS

MAY

EXIST

ON

THE

SEMI-

/

CONDUCTOR

CIRCUITRY.

/

901

4_1

POWER DESIGNS 3K10 Manuel utilisateur

Manuels Générateur portable populaires d'autres marques