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OPERATING

AND

SERVICING

MANUAL

OPERATING

AND

SERVICING

MANUAL

MODEL

460AR

WIDE

BAND

AMPLIFIER

SERIALS

PREFIXED:

046

)

OUTPUT

INPUT wlOE

•A

"ER

"OO[l

ct/J

HI.

,......'

GAIN

POWER

•

NORTH

SHORE

LTD.

1074

Cheltenllam

Rd.

Santa

Barbara,

Calif.

93105

)

HEWLETT-PACKARD

COMPANY 1956

1501 PAGE MILL ROAD,

PALO

ALTO, CALIFORNlA, U. S. A.

printed

1/61

00019-2

)FREQUENCY RESPONSE:

GAIN:

SINUSOIDAL OUTPUT:

PULSE OUTPUT:

INPUT IMPEDANCE:

OUTPUT IMPEDANCE:

NOISE FIGURE:

DELAY CHARACTERISTICS:

RISE TIME:

00019-2

SPECIFICATIONS

High FriO!uency-

closely

matches

Gaussian

curve

when

operating

into

a20

-ohm

resistive

load.

3db point

120

me.

Low

Frequency

-off

approximately

3db

20 kc when

operating

into

matched

load. Off

approximately

3db

3kc when

operating

into

open

circuit

(Le.,

CRT

plates).

With

4lOB VTVM -

whenusedwith~

46A-95DAdapter,

response

±1db, 200 kc

200

me.

Nominally

20db

into

200 ohm load. Gain

control

has

range

6db.

Five

amplifiers

may

cascaded.

Approximately

volts

peak

open

circuit,

less

than

distortion.

Positive

Pulse

Input:

Vopen

circuit:

+3.2

into

rated

load

Negative

Pulse

Input:

-20

Vopen

circuit:

-8

into

rated

load

200

ohms

300

ohms

Less

than 10 db

Approximately

0.014

lisec.

Nominally 0.003

sec

(10% to

90%

amplitude).

appreciable

overshoot.

115/230

volts

10%,

50/1000

cps,

watts

)POWER SUPPLY:

DIMENSIONS:

(Rack

Mount)

lit

REAR

4---19--_

Ita

)

WEIGHT:

ACCESSORIES AVAILABLE:

Net

lbs.

Shipping weight 18

Ibs.

~46A-16A

Patch

Cord;

200

ohms,

feet

long

~46A-16B

Patch

Cord;

200

ohms,

feet

long

46A-95A

Panel

Jack;

for

200-ohm

cables,

low

capacitance

46A-95B

Cable

Plug;

for

200-ohm

systems

812-52

Cable;

200

ohm

cable

in length to

specification

46A-95C SO-ohm

Adapter;

Type

460,

ohm

termination

46A-95D

Adapter;

410B VTVM to

460, no

termination

46A-95E

Connector

Sleeve;

Joins

two 46A-95B

Cable

Plugs

46A-95F

Adapter;

For

connecting

5XP

CRT

~46A-95G

Adapter;

Connect

~460 to

Tektronic

511

Oscilloscope

46A-95H

Adapter;

Type

t/iiJ

460, 200

ohm

termination

46A-95J

Adapter;

Type

Nto

460, no

termination

46A-95K

Adapter;

~410 VTVM to

460, 200 ohm

termination

460B-95A

Adapter;

For

connecting

to~

Model 150A

Oscilloscope

plates.

Section

TENTS

FOR

MODEL

460AR

WIDE

BAND

AMPLIFIER

GENERAL

DESCRIPTION

1-1

1-2

1-3

General.

• . • • • •

Accessories

Available

230-Volt

Operation

.•

Section

OPERATING

INSTRUCTIONS

2-1

2-2

2-3

2-4

2-5

Inspection.

.•••••

Controls

and

Terminals.

. • • •

Ins

tallation.

. • • . • • • •

Operation

•••••••••

Circuit

Description.

•

Section

III

MAINTENANCE

3-1

Cover

Removal.

-2

Tube

Replacements.

•

3-3

Power

Supply

• • • •

3-4

230-Volt

Operation

••••••

3-5

Trouble

Shooting.

• .

-6

Replacement

200

ohm

Cable

Connector

3-7

Test

Procedure

•••••••••••

Section

TABLE

REPLACEABLE

PARTS

. . . .

)

SECTION

GENERAL

DESCRIPTION

1-1

GENERAL

The

<$lModel

460AR

wide

band

distributed

amplifier

especially

designed

amplify

high

speed

pulses

high

voltage

levels

with

negligible

overshoot.

order

retain

the

fast

rise

time

and

shape

high

speed

pulses,

necessary

that

the

amplifier

have

wide,

reasonably

flat

frequency

response.

The

frequency

re-

sponse

the

~model

460AR

closely

approximates

the

gaussian

response

and

hence

retains

the

characteristics

short

fast

pulses.

gain

may

obtained

with

this

amplifier.

five

amp-

lifiers

may

cascaded

for

additional

amplification.

The

Model

460AR

useful

general

laboratory

amplifier,

increase

voltmeter

and

oscilloscope

sensitivity,

and

television

work.

)

1-2

1-3

ACCESSORIES

AVAILABLE

complete

line

accessories,

for

use

with

the

Model

460AR,

available

from

the

Hewlett-Packard

Company.

These

accessories

are

listed

the

Specification

page

and

the

end

the

Table

Replaceable

Parts

this

manual.

230

VOLT

OPERATION

This

instrument

can

easily

converted

for

operation

from

230

volt

power

source.

This

conversion

covered

the

maintenance

section

this

manual.

-1-

)

SECTION

OPERA

TING

INS

TIONS

2-1

INSPECTION

After

the

instrument

unpacked,

should

carefully

inspected

for

damage

received

transit.

any

shipping

damage

found,

the

procedure

outlined

the"

Claim

for

Damage

Ship-

ment"

page

the

back

this

instruction

book.

2-2

CONTROLS

AND

TERMINALS

This

toggle

switch

controls

all

the

power

supplied

the

instru-

ment

from

the

power

line.

GAIN

This

variable

resistor

controls

the

gain

the

amplifier.

FUSE

The

fuseholder,

located

the

panel,

contains

the

power

line

fuse.

Replacement

fuses

should

the

type

specified

the

Table

Replaceable

Parts.

POWER

CABLE

The

three-conductor

power

cable

supplied

with

this

instrument

terminated

polarized

three-prong

male

connector.

The

third

contact

offset,

round

added

standard

two-

bladed

a-c

plug

which

grounds

the

instrument

chassis

when

used

with

appropriate

receptacle.

adapter

may

used

con-

nect

this

plug

standard

two

contact

system.

When

the

adapter

used,

the

ground

connection

brought

out

short

wire.

This

ground

lead

should

then

connected

suitable

ground

for

the

protection

operating

personnel.

INPUT

AND

OUTPUT

The

input

and

output

jacks

the

control

panel,

require

special

200-ohm

connectors

and

cables.

2-3

INSTALLATION

special

precautions

are

necessary

except,

when

several

460

Amplifiers

are

used

cascade,

they

must

have

good

com-

mon

ground,

mounted

relay

rack,

and

the

high-voltage

-3-

output

must

kept

away

from

the

input

avoid

the

possibility

feedback.

2-4

OPERATION

The

input

circuit

the

Model

460AR

terminated

transmission

line

with

characteristic

impedance

200

ohms.

The

output

circuit

has

impedance

280

ohms

(resistive).

The

load

impedance

determines

the

gain

the

amplifier.

Therefore.

not

neces

sary

match

the

load

the

output

the

amplifier

unless

the

gain

adversely

affected.

Shown

below

are

two

dia-

grams

for

connecting

matched

unmatched

load

the

Model

460AR

using

200

ohm

cable.

Connect

acros

output

Jack

inside

instrument

200

ohms

load

,-,

4'-----+/-'

.-0--'

-----,

Model

460AR

OUTPUT

~~~----'

-L"""

200

ohm

cable

,\•

620

any

ohms

load

Model

460AR

OUTPUT

200

ohm

cable

The

GAIN

control

will

vary

the

gain

the

amplifier

over

range

approximately

db.

This

control

provided

that

the

gain

the

amplifier

can

set

known

value

nec-es

sary.

There

feedback

the

amplifier.

the

gain

directly

proportional

the

tubes.

The

gain

also

determined

the

output

load

and

will

vary

with

output

load

accordance

with

the

relation

280

The

Wide

Band

Amplifier

can

used

with

the

<$Model

410

Vacu-

Tube

Voltmeter

provide

additional

sensitivity

measuring

high

frequencies.

special

adaptor

available

connect

the

probe

the

Model

410

the

output

terminal

the

amplifier.

The

overall

frequency

response

the

Model

460AR.

combina-

tion

with

the

Model

410.

within

out

190

me.

This

combi-

nation

will

give

full

scale

meter

reading

the

Model

410

with

1/10

volt

applied

the

input

the

Model

460AR.

-4-

Several

amplifiers

can

cascaded

when

than

gain

desired.

The

maximum

gain

which

can

used

will

limited

the

effective

noise

generated

the

input

circuit

the

amplifier.

The

noise

figure

approximately

db.

When

amplifiers

are

cascaded.

the

rise

time

will

greater

than

that

single

unit

accordance

with

the

relation:

1/2

T • t

(n)

where:

total

rise

time

the

rise

time

single

unit

10-9

sec.)

the

number

460

units.

The

total

rise

time

any

number

460

Amplifiers

conjunction

with

any

load

may

found

approximately

the

following

relation:

[nt

(440C)2J

1/2

where:

)

2-5

CIRCUIT

DESCRIPTION

n •

number

460

Amplifiers

t -

rise

time

one

460

2.6

10-9

sec.

C •

total

shunt

capacitance

the

output

the

460

farads.

total

rise

time.

The

Model

460AR

amplifier

which

has

very

wide

transmiss-

ion

band.

has

two

stages

with

five

tubes

the

first

stage

and

seven

tubes

the

second

stage.

The

grids

these

tubes

are

con-

nected

along

one

transmission

line

for

the

input

circuit

and

the

plates

the

tubes

are

connected

along

second

transmission

line

for

the

output

circ

uit.

wave

traveling

down

the

input

line

ex-

cites

the

grids

succession

and

half

the

corresponding

wave

generated

the

plate

circuit

travels

down

the

plate

line

toward

the

output

and

reinforced

each

successive

plate.

The

part

the

wave

the

plate

line

which

travels

the

reverse

direction

absorbed

termination

the

other

end

that

line.

the

time

the

wave

the

plate

line

reaches

the

output.

has

been

am-

plified

about

db.

The

second

stage

adds

another

make

total

gain

for

the

unit.

The

Model

460AR

will

amplify

pulses

with

extremely

short

rise

time

and

with

virtually

overshoot.

The

time

rise

the

am-

plifier

itself

approximately

millimicroseconds.

The

amplifier

has

amplitude

response

closely

matching

the

Gaussian

Curve.

which

the

ideal

transmission

for

pulse

amplifications

when

ring-

overshoot

cannot

tolerated.

-5-

)

SECTION

III

MAINTENANCE

-1

COVER

REMOVAL

You

will

able

slide

the

one-piece

cover

off

the

instrument

after

removing

the

four

screws

the

rear

the

cover.

3-2

TUBE

REPLACEMENTS

many

cases

instrument

malfunction

can

corrected

replac-

ing

weak

defective

tube.

Before

making

any

internal

adjust-

ment

component

replacement,

check

the

tubes.

Adjustments

made

attempt

compensate

for

defective

tube

will

often

complicate

the

repair

problem.

good

practice

check

tubes

substitution

rather

than

the

use

"tube

checker".

The

res

ults

obtained

from

the

"tube

checker"

can

misleading.

Mark

original

tubes

insure

return

the

same

socket.

Replace

only

tubes

proved

weak

de-

fective.

Any

tube

with

corresponding

standard

EIA

(JEDEC)

characteristics

can

used

replacement.

3-3

POWER

SUPPLY

Rectifier

CRI

connected

half-wave

circuit.

The

output

voltage

between

ground

and

the

junction

C96

and

L25

should

110±:lO

volts

with

the

line

voltage

set

115

volts.

The

GAIN

control

should

set

fully

clockwise

maximum.

Ripple

voltage

can

quite

high

without

affecting

instrument

performance.

Low

power

supply

voltages

are

generally

due

weak

selenium

rectifier,

leaky

filter

capacitors,

shorted

tubes

off

value

plate

line,

grid

line,

screen

resistors.

3-4

230

VOLT

OPERATION

The

r$fJ

Model

460AR

can

quickly

and

easily

converted

operate

from

nominal

230

volt

50/1000

cps

power

source.

The

instrument

normally

supplied

with

the

dual

primary

windings

the

power

transformer

connected

parallel

for

115

volt

operation.

con-

vert

for

230

volt

operation,

reconnect

the

primary

windings

series

shown

the

schematic

diagram.

The

line

fuse

F I

must

also

changed

from

amp.

slow-blow

0.4

amp.

slow-blow.

-7-

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