HP 460A Operating Manual

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INSTRUCTION

AND

OPERATING

MANUAL

FOR

MODEL

460A

WIDE

BAND

AMPLIFIER

Serial

1996

and

Above

..

HEWLETT-PACKARD

COMPANY

275

PAGE

MILL

ROAD,

PALO

ALTO,

CALIFORNIA,

U.S.A.

#460A004

General

Description

The

Model

460A

Wide

Band

Amplifier

is

designed

to

faithfully

am-

plify

extremely

short

pulses

without

objectionable

ringing

or

over-

shoot.

The

high

frequency

response

matches

the

Gaussian

curve.

A

gain

of

20

db

is

obtained

with

this

amplifier

0

Up

to

five

ampli-

fiers

may

be

cascaded

for

additional

amplification.

The

Model

460A

is

useful

asageneral

laboratory

amplifier,

to

increase

voltmeter

and

oscilloscope

sensitivity,

and

in

television

work.

Parts

Substitutions

Difficulties

in

procuring

some

of

the

parts

used

in

this

instrument

may

cause

the

electrical

or

physical

values

to

deviate

from

those

shown

in

this

instruction

manual.

These

substitutions

have

been

made

so

as

not

to

impair

the

performance

of

this

instrument

o

Whenever

replacement

of

any

of

these

parts

is

necessary,

either

the

substitute

value

or

the

original

value

may

be

used.

SPECIFICATIONS

FOR

c§j)

MODEL

460A

WIDE

BAND

AMPLIFIER

FREQUENCY

RESPONSE:

GAIN:

OUTPUT:

INPUT

IMPEDANCE:

NOISE

FACTOR:

DELAY

CHARACT

ERISTICS:

RISE

TIME:

POWER

SUPPLY:

SIZE:

WEIGHT:

High

Frequency

-

closely

matches

Gaussian

curve

when

operating

into

a

lOO-ohm

resistive

load.

3

db

point

is

140

mc.

Low

Frequency

-

when

operating

from

a

200-ohm

source

and

O.

1

~f

blocking

condenser.

frequency

response

off

3

db

at3kc

into

an

open

circuit

or

succeeding

amplifier.

When

operat-

ing

intoa200

-ohm

load,

off3db

at

100

kc.

With

c§j)410B

VTVM

-

when

used

with

c§j)

46A

-95D

Adapter.

response

i:1

db.

ZOO

KC

to

200

MC.

Approximately

ZO

db

into

ZOO-ohm

load.

Gain

control

has

range

of6db.

Five

amplIfiers

may

be

cascaded.

Approx.

8 v

peak

open

circuit.

Output

impedance,

300

ohms.

ZOO

ohms.

Less

than

10

db.

Approx.

.0

14~sec.

Approx.

.

00z6

~

sec.

(10%

to

90%

amplitude).

No

appreciable

over-

shoot.

115/Z30

v

±10%.

50/1000

CPSD

35

watts.

19"

relay

rack

panel.

5-1/4"

high;

6-3/4"

deep.

11

pounds.

i

SECTION

I

OPERATING

INSTRUCTIONS

1-1

INSPECTION

This

instrument

has

been

thoroughly

tested

and

inspected

before

being

shipped

and

is

ready

for

use

when

received.

After

the

instrument

is

unpacked

a

it

should

be

carefully

inspected

for

damage

received

in

transit.

If

any

shipping

damage

is

found

a

follow

the

procedure

outlined

in

the

"Claim

for

Damage

in

Ship-

ment"

page

at

the

back

of

this

instruction

book.

1-2

CONTROLS

AND

TERMINALS

ON

This

toggle

switch

controls

all

the

power

supplied

to

the

instru-

ment

from

the

powerline.

Q)

:>

0

.g

"d

s::

cd

-.J:)

0"­0"-

....

....

cd

....

!-f

1-3

Q)

U)

I.!)
I.!)

-

0"-

-

N

....

-:t'

0

0

<

0

-.J:)

-:t'

GAIN

This

variable

resistor

controls

the

gain

of

the

amplifier.

FUSE

The

fuseholder

contains

a 006

ampere

cartridge

fuseo

The

fuse

may

be

replaced

by

unscrewing

the

fuseholder

cap

and

inserting

a

new

fuseo

Replacement

fuses

for

this

instrument

should

be

of

the

llslow

blow"

type

as

specified

in

the

Replaceable

Parts

Lista

INPUT.

OUTPUT

JACKS

AND

ACC

ESSORIES

The

input

and

output

jacks.

located

on

the

control

panel.

fit

special

connectors

and

cables

which

have

been

designed

for

use

with

Model

460A

because

it

is

not

possible

to

obtain

the

best

performance

with

this

type

of

device

if

standard

commercially

available

connectors

are

used

o

The

accessories

listed

below

are

not

supplied

with

the

instrument.

These

accessories

are

designed

to

solve

special

connection

problems

likely

to

be

encountered

in

the

use

of

the

Model

460A

o

The

acces-

sories

may

be

purchased

from

the

Hewlett-Packard

Companyo

cffp

MODEL

NO

o

46A-16A

DESCRIPTION

Patch

Cord

-

Special

200

ohm

cable

two

feet

in

length.

complete

with

two

No.

46A-

95B

Cable

Plugs.

for

inter-connection

of

two

amplifiers

in

cascade.

-1-

~

MODEL

NO.

46A-16B

DESCRIPT

ON

Patch

Cord

-

Same

as

No.

46A-16A

except

six

feet

in

length.

46A-95A

Panel

Jack-Special

low

capacita.nce

panel

jack

designed

for

ZOO

ohm

cable.

Mates

with

Nos.

46A-16A

and

46A-16B

Patch

Cords

or

No.

46A-95B

Cable

Plug.

Requires

1-1/8

inch

diameter

mounting

hole.

46A-95B

Cable

Plug

-

Low

capacitance

plug

de-

signed

for

use

with

ZOO

ohm

cable

o

Mates

with

No.

46A-95A

Panel

Jack

and

with

No.

46A-95E

Connector

Sleeve.

8lZ-5Z

Cable

Special

ZOO

ohm

cable

available

in

lengths

to

meet

customer

req"Girements.

The

input

circuit

of

the

Model

460A

isaterminated

transmission

line

with

a

characteristic

impedance

of

ZOO

ohms.

The

output

circuit

has

an

impedance

of

Z80

ohms

(resistive)o

The

load

impedance

determines

the

gain

of

the

amplifiero

Therefore,

it

is

not

necessary

to

match

the

load

to

the

output

of

the

amplifier

unless

the

gain

is

adversely

affected.

Shown

below

are

two

dia-

grams

for

connecting

a

matched

or

unmatched

load

to

the

Model

460A

using

a

ZOO

ohm

cable.

I-'

N

-

-.D

-

11l
11l

Adapter

for

connection

to

5XP

CRTo

50

Ohm

Adaptor

-

Provides

a

cyp~

N

con-

nection

for

coupling

a

50

ohm

transmission

line

to

the

input

ofaModel

460A

amp_i£ier~

Includes

a

terminating

resistor.

Connector

Sleeve

-

Provides

for

joining

two

Noo46A-95B

C3.ble

Plugs

in

order

to

interconnect

two

lengths

of

ZOO

ohm

cable

o

Adaptor

for

Model

410A/B

Voltmeter

Probe

-

Consists

ofabayonet

type

sleeve

with

which

a

Model

410A/B

Probe

may

be

directly

connected

to

the

output

of

a

Model

460A

Amplifier

o

Includes

the

proper

compensating

LC

components.

46A-95F

46A-95E

46A-95C

46A-95D

OPERATION

1-4

-Z

-

200
ohms
load

-(<e-T-(-~'~--

...

1

Model

460A

OUTPUT

Model

460A

OUTPUT

Connect

across

output

Jack

--

inside

ins

rument

--<~--f(-"+-\

--+~

620

To

any

ohms

load

#812-52

200

ohm

cable

LO
LO

-

0'

-

N

-

The

GAIN

control

will

vary

the

gain

of

the

amplifier

over

a

ange

of

approximately

6

db.

This

control

is

provided

so

that

the

gain

of

the

amplifier

can

be

set

toaknown

value

if

necessary.

There

is

no

feedback

in

the

amplifier

D

so

the

gain

is

directly

propor-

tional

to

the

Gm

of

the

tubes.

The

gain

is

also

determined

by

he

output

load

and

will

vary

with

output

load

in

accordance

with

th

relation

280

X

ZL

280

+

ZL

The

Wide

Band

Amplifier

can

be

used

with

the

0jJ

Model

410B*

Vacuum

Tube

Voltme

er

to

provide

additional

sensitivity

in

meas-

uring

high

frequencies.

A

special

adaptor

is

a

ailable

to

connect

the

probe

of

the

Model

410B*

to

the

output

terminal

0

the

amplifi

r.

The

overall

frequency

response

of

the

Model

460A.

in

combination

with

the

Model

410B.

is

within

1

db

out

to

190

mc.

This

combI-

nation

will

giveafull

scale

meter

reading

on

the

Model

410B

with

1/ 10

volt

applied

to

the

input

of

the

Model

460A.

Several

amplifiers

can

be

cascaded

when

more

than

20

db

gain

is

desired.

The

maximum

gain

which

can

be

used

will

be

limited

by

the

effective

noise

generated

in

the

input

circuit

of

the

amplifier.

The

noise

factor

is

approximately

10

db.

The

time

of

rise

ofasingle

unit

is

approximately

2.6millimicro-

seconds.

As

units

are

cascaded

D

the

time

of

rise

goes

up

as

the

square

root

of

the

sum

of

the

squares

of

times

of

rise

of

he

individual

stages.

Therefore.

for

two

stages

in

cascadeD

the

time

*

Also

Model

4l0A

-3

-

of

rise

will

be

approximately

3.7millimicroseconds

and

for

three

stages,

the

time

of

rise

will

be

approximately

4.4

millimicro-

seconds.

1-5

CIRCUIT

DESCRIPTION

The

Model

460A

isanew

type

amplifier

which

hasavery

wide

transmission

band.

It

has

two

stages

with

five

tubes

in

the

first

stage

and

seven

tubes

in

the

second

stage.

The

grids

of

these

tubes

are

connected

along

one

transmission

line

for

the

input

cir-

cuit

and

the

plates

of

the

tubesare

connected

along

a

second

transmission

line

for

the

output

circuit.

A

wave

traveling

down

the

input

line

excites

the

grids

in

succession

and

half

of

the

cor-

responding

wave

generated

in

the

plate

circuit

travels

down

the

plate

line

toward

the

output

and

is

reinforced

at

each

successive

plate.

The

part

of

the

wave

in

th

plate

line

which

travels

in

the

reverse

direction

is

absorbed

byatermination

of

the

other

end

of

that

line.

By

the

time

the

wave

in

the

plate

line

reaches

the

out-

put,

it

has

been

amplified

by

about

10

db.

The

second

stage

adds

another

10

db

to

make

a

total

of

20

db

gain

for

the

unit.

The

Model

460A

will

amplify

pulses

with

an

extremely

short

rise

time

and

with

vi

tually

no

overshoot.

The

time

of

rise

of

the

amplifier

itself

is

approximately

2.6

millimicroseconds.

The

amplifier

has

an

amplitude

response

closely

matching

the

Gaussian

Curve,

which

is

the

ideal

transmis

sion

for

pulse

amplifications

when

ringing

or

overshoot

cannot

be

tole=ated.

-4-

1000

MC

100MC

10NC

fllEQUENCY

INC

~

~

",.

..........

-

...

......:

~

.......

'V

~A

~

....

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\

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\

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\\

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,

A =

Amplifier

with

4l0B

Voltmeter

Adapter

\1

I

B •

Amplifier

working

into

200.1\-

Resistance

Load

1\

C =

Gaussian

Curve

-

Optimum

for

Pulse

\

o_

100

KC

2

4

6

8

14

16

18

20

22

~

12

.........

~

10

CQ

~

TYPICAL

RESPONSE

CURVES

MODEL

460A

WIDE

BAND

AMPLIFIER

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SCHEMATIC

DIAGRAM

OF

MODEL

460A

TRANSFORMER DETAIL

11

11''''

}>OY

II!V

WIDE BAND

AMPLIFIER

SER I

AL

19968

ABOVE

•

TABLE

OF

REPLACEABLE

PARTS

NOTE

Any

changes

in

the

Table

of

Replaceable

Parts

will

be

listed

onaProduction

Change

sheet

at

the

front

of

this

manual.

When

ordering

parts

from

the

factory

always

include

the

following

information:

Instrument

model

number

Serial

number

-hp-

stock

number

of

part

Description

of

part

Circuit

Ref.

R1,

RIO

TABLE

OF

REPLACEABLE

PARTS

-hp-

Description

Stock

No.

Resistor:

fixed,

composition,

270

ohms

23-270

±10%,

112

W

Electrical

value

adjus

ted

at

factory

Mfr.

*

~

Mfrs.

Designation

B

EB

2711

R2,

R3, R4,

Resistor:

fixed,

composition,

R5,R6,R7

12

ohms,

±10%,

1/2

W

Rll-R18

23-12

B

EB

1201

Cl-C7,ClO

Capacitor:

fixed,

ceramic,

C12-C19

001

\-.lf,500

vdcw

R8

R9

0

R20

R19

R21

R22

R23

C9abc

C8,

C20

Cll

Sl

T1
L25

F1

11

V1-V12
J1,

J2

Resistor:

fixed,

composition,

195

ohms,

± %. 1

12

W

Resistor:

fixe

do

composition,

5600

ohms,

±lO%,

112

W

Resistor:

fixe

do

composition,

195

ohms,

±1%,

1/2

W

Re

sistor:

fixed,

composition,

33

ohms,

±10%,

1 W

Resistor:

variable,

wirewound,

50

ohms,

±10%,

3

W,

linear

taper

Resistor:

fixed,

composition,

10

ohms,

±10%,

1 W

Capacitor:

fixed,

electrolytic,

40\-.lf,

l0\-.lf,

l0\-.lf,

150

vdcw

Capacitor:

fixed,

ceramic,

o

0082

\-.lf,500

vdcw

Capacitor:

fixed,

ceramic,

•

005

\-.lf,min

o

,

500

vdcw

Switch,

toggle:

SPST

Transformer:

power

Reactor:

6H

Fuse:

006

Amp,

Slo-Blo

type

Lamp:

6-8volt

#47

Tube:

electron,

5654

Jack:

panel

30-195

23-5600

30-195

24-23

210-2

24-10

15-43

18-8

15-46

15-47

310-11

910-133
911-47
211-49
211-47
212-5654

46A-76

Electra

MfgoCoo

Type

DC-1/8

B

EB

5621

Electra

Mfg

o

Coo

Type

DC-1/8

B

GB

3301

G

21-010-067

B

GB

1001

K

Type

BPD-10

x

K

Type

BPD

K

Type

BPD-5

D,

#81715
HP
HP

T,

#3130600

0,

#47

zz

HP

....

tv

-

-.0

.........

U1

U1

*See

"List

of

Manufacturers

Code

Letters

For

Replaceable

Parts

Table."

-5-

•

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If,

--.

0'-

-

N

-

TABLE

OF

REPLACEABLE

PARTS

Circuit

-hp-

Mfr.

* •

Mfrs.

Ref.

Description

Stock

No.

Desianation

CR-l

Rectifier:

selenium

212-50

M,

403Dx78A

Knob:

37-11

HP

Power

Cord:

812-56

HP

Fuseholder:

140-16

T,

#342003

*See

"List

of

Manufacturers

Code

Letters

For

Replaceable

Parts

Table.

II

-6-

•

LIST

OF

MANUFACTURERS

CODE

LETTERS

FOR

REPLACEABLE

PARTS

TABLE

Code

Letter

A

B

C

D

E

F

G

H

HP

I

J

K

L

M
N

o

P

R

S

T
V
X

Z

AA

CC

DD

EE

FF

HH

II

KK

LL

MM

ZZ

Manufacturer

Aerovox

Corp.

Allen-Bradley

Co.

Atnperite

Co.

Arrow,

Hart

and

Hegetnan

Busstnan

Manufacturing

Co.

Carborundutn

Co.
Centralab
Cinch

Manufacturing

Co.
Hewlett-Packard
Clarostat

Manufacturing

Co.

Cornell

Dubilier

Electric

Co.

Hi-Q

Division

of

Aerovox

Corp.

Erie

Resistor

Corp.

Federal

Telephone

and

Radio

Corp.

General

Electric

Co.

General

Electric

Supply

Corp.

Girard-Hopkins

International

Resistance

Co.

Lectrohtn,

Inc.

Littelfuse,

Inc.

Micatnold

Radio

Corp.

p.

R.

Mallory

Co.,

Inc.

Sangatno

Electric

Co.

Sarkes

Tarzian

Sprague

Electric

Co.

Stackpole

Carbon

Co.

Sylvania

Electric

Products,

Inc.

Western

Electric

Co.
Atnphenol
Dial

Light

Co.

of

Atnerica
Switchcraft,

Inc.

Gretnar

Mfg.

Co.

Carad

Corp.

Any

tube

having

RETMA

standard

characteristics

90BY013

CLAIM

FOR

DAMAGE

IN

SHIPMENT

The

instrument

should be tested as soon asitis received.Ifit fails to operate

properly, or is

damaged

in any way, a claim should be filed with the

carrier.

A full

report

of the

damage

should be obtained by

the

claim agent,

and

this

report

should

be forwarded to us. We will then advise you of the disposition

to

be madeofthe

equipment

and

arrange

for

repairorreplacement. Include model

number

and

serial

number

when

referring

to this

instrument

for any reason.

WARRANTY

Hewlett-Packard Company

warrants

each

instrument

manufactured

by

them

to

be free from defectsinmaterial

and

workmanship.

Our

liability

under

this

warranty

is limited to servicinGoradjusting

allY

instrument

returnedtothe factory

for

that

purpose

and

to replace any defective

parts

thereof. Klystron tubes as well as

other

electron tubes, fuses

and

batteries

are

specifically excluded from any liability.

This

warranty

is effective for one year after delivery to the

original

purchaser

when

the

instrument

is returned,

transportation

charges

prepaid

by the original

purchaser,

and

when upon

our

examinationitis disclosed to

our

satisfaction to be defective.

If

the fault

has

been caused by misuseorabnormal

conditionsofoperation,

repairs

will be billed at cost. In this case,anestimate will be submitted before the work is

started.

If

any fault develops, the following steps should be taken:

1. Notify us, giving full details of the difficulty,

and

include the model

number

and serial number. On receipt of this information,

we

will give you service

data

or shipping instructions.

2. On receipt of shipping instructions,

forward

the

instrument

prepaid, to the

factory

or

to the authorized

repair

station indicated on the instructions.Ifrequested,

an

estimate of the

charges

will be

made

before the work begins

provided

the

instru-

ment is not covered by the

warranty.

SHIPPING

All shipments of Hewlett-Packard instruments should be

made

via

Truck

or

Railway Express.

The

instruments should be packedina

strong

exterior

container

and

surrounded

by twoorthree inches of excelsiororsimilar shock-absorbing material.

DO

NOT

HESITATE

TO

CALL ON US

HEWLETT-PACKARD

COMPANY

..eab"rat"ry

#""trum.",,,

fur

eJ'/><.,1

a",l.5X!

auracy

275

PAGE

MILL

ROAD

PALO ALTO.CALIF. U.S.A.

CABLE

'I.

"HEWPACK"