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PRECISION

INSTRUMENTATION

FOR

RESEARCH

Oak

Ridge

Technical

Enterprises

Corporation

OAK

RIDGE,

TENNESSEE

INSTRUCTION

MANUAL

MODEL

427

DELAY

AMPLIFIER

Serial

No.

Purchaser.

1

INSTRUCTION

MANUAL

MODEL

427

DELAY

AMPLIFIER

Date

Issued

OAK

RIDGE

TECHNICAL

ENTERPRISES

CORPORATION

p.

O.

BOX

C

OAK

RIDGE,

TENNESSEE

Telephone

(615)

483-8451

TWX

810-572-1078

I

Oak

Ridga

Technical

Enterprises

Corporation

1966

Printed

in

U.S.A.

CONTENTS

WARRANTY

PHOTOGRAPH

1.

DESCRIPTION

2.

SPECIFICATIONS

2.1

Electrical

2.2

Mechanical

3.

INSTALLATION

3.1

General

Installation

Considerations

3.2

Connection

to

Power

-

Nuclear

Standard

Bin,

ORTEC

Model

401/402

3.3

Signal

Connections

to

Model

427

4.

OPERATING

INSTRUCTIONS

4.1

Initial

Testing

and

Observation

of

Pulse

Waveforms

4.2

Connector

Data

4.3

Typical

Operating

Considerations

5.

CIRCUIT

DESCRIPTION

6.

MAINTENANCE

6.1

Testing

Performance

of

the

Delay

Amplifier

6.2

Changing

Amplifier

Gain

6.3

Suggestions

for

Troubleshooting

6.4

Tabulated

Test

Point

Voltages

7.

Model

427

Block

Diagram

427-0100-Bl

Model

427

Schematic

427-0100-Sl

r

i

I

i

t

i

STANDARD

WARRANTY

FOR

ORTEC

ELECTRONIC

INSTRUMENTS

DAMAGE

IN

TRANSIT

Shipments

should

be

examined

immediately

upon

receipt

for

evidence

of

external

or

con

cealed

damage.

The

carrier

making

delivery

should

be

notified

immediately of

any

such

damage,

since

the

carrier

is

normally

liable

for

damage

in

shipment.

Packing

materials,

waybills,

and

other

such

documentation

should

be

preserved

in

order

to

establish

claims.

After

such

notification

to

the

carrier,

notify

ORTEC

of

the

circumstances

so

that

we

may

assist

in

damage

claims

and

in

providing

replacement

equipment

when

necessary.

WARRANTY

ORTEC

warrants

its

electronic

products

to

be

free

from

defects

in

workmanship

and

materials,

other

than

vacuum

tubes

and

semiconductors,

for

a

period

of

twelve

months

from

date

of

ship

ment,

provided

that

the

equipment

has

been

used

in

a

proper

manner

and

not

subjected

to

abuse.

Repairs

or

replacement,

at

ORTEC

option,

will

be

made

without

charge

at

the

ORTEC

factory.

Shipping

expense

will

be

to

the

account

of

the

customer

except

in

cases

of

defects

discovered

upon

initial

operation.

Warranties

of

vacuum

tubes

and

semiconductors,

as

made

by

their

manufacturers,

will

be

extended

to

our

customers

only

to

the

extent

of

the

manufacturers'

liability

to

ORTEC.

Specially

selected

vacuum

tubes

or

semiconductors

cannot

be

warranted.

ORTEC

reserves

the

right

to

modify

the

design

of

its

products

without

incurring

responsibility

for

modification

of

previously

manufactured

units.

Since

installation

conditions

are

beyond

our

control,

ORTEC

does

not

assume

any

risks

or

liabilities

associated

with

the

methods

of

installation,

or

installation

results.

QUALITY

CONTROL

Before

being

approved

for

shipment,

each

ORTEC

instrument

must

pass

a

stringent

set

of

quality

control

tests

designed

to

expose

any

flaws

in

materials

or

workmanship.

Permanent

records

of

these

tests

are

maintained

for

use

in

warranty

repair

and

as

a

source

of

statistical

information

for

design

improvements.

REPAIR

SERVICE

ORTEC

instruments

not

in

warranty

may

be

returned

to

the

factory

for

repairs

or

checkout

at

modest

expense

to

the

customer.

Standard

procedure

requires

that

returned

instruments

pass

the

same

quality

control

tests

as

those

used

for

new

production

instruments.

Please

contact

the

factory

for

instructions

before

shipping

equipment.

ORTEC

€>

MODEL

427

DELAY

AMPLIFIER

.25

fiiec

.5/Mec

D

E

L

A

Y

0

U

T

ti%ec

D

E

L

A

Y

I

N

/isec

:

Msec

INPUT

output

©

Model

427

Delay

Amplifier

NOTICE

Slide

switches

are

used

in

the

Model

427

to

select

the

desired

amount

of

signal

delay.

The

contacts

of

these

switches

are

coated

with

a

lubricant

to

prevent

them

from

oxidizing.

If

this

lubricant

is

removed

from

a

portion

of

the

contact

oxidation

may

occur.

This

can

result

in

some

difficulty

with

these

switches

making

contact

properly.

This

problem

can

be

alleviated

by

operating

the

switch

a

few

times.

If

a

switch

does

not

make

contact

either

the

signal

will

not

appear

at

the

output

or

it

will

appear

at

a

reduced

amplitude.

If

this

happens,

simply

operate

the

switch

a

few

times

to

remove

the

oxide.

427112966

1-1

MODEL

427

DELAY

AMPLIFIER

1.

DESCRIPTION

The

Model

427

Delay

Amplifier

has

a

nominal

gain

of

unify

and

provides

the

capability

of

linearly

delaying

a

linear

or

logic

signal

from

zero

to

4.75

microseconds

in

0.25

micro

second

increments.

The

amount

of

delay

is

selected

by

five

front

panel

switches.

This

delay

is

accomplished

by

inserting

any

combination

of

five

delay

lines

of

0.25,

0.5,

1.0,

1.0,

or

2.0

microseconds

in

series

with

the

signal

path.

These

delay

lines

are

terminated

in

their

characteristic

impedance

at

both

ends

to

minimize

impedance

mismatch

and

resul

tant

pulse

reflections

on

the

lines.

NOTE:

The

427

has

a

limited

bandwidth

as

shown

in

the

specifications.

Due

to

this

fact,

it

should

not

be

used

to

delay

signals

of varying

bandwidth

such

as

the

output

of

a

biased

amplifier

(i.e..

Model

408).

If

a

biased

amplifier

is

used

in

a

system,

the

427

should

be

used

in

front

of

it

or

after

the

411

Pulse

Stretcher

where

the

pulses

have

a

uniform

bandwidth.

427112966

2-1

2.

SPECIFICATIONS

2.1

Electrical

Input

Polarity

Input

Signal

Span

Input

Impedance

Gain

Gain

Variation

with

Delay

Feedthrough

and

Delay

Ripple

Linear

Delay

Minimum

(Zero)

Delay

Maximum

Delay

Delay

Line

Tolerances

Rise

Time

and

Bandwidth

as

a

Function

of

Delay

Output

Output

Impedance

Linearity

Either

positive

or

negative

±10

volts

linear

range

Greater

than

IK

Unity

+2%

at

zero

delay

+

10%,

-2%

for

any

combination

of

delays

(1

psec

DRC

shaped

pulse)

Less

than

2%

(Ipsec

RC

shaped

pulse)

Any

combination

of

the

following:

0.25,

0.5,

1.0, 1.0,

and

2.0psec

60

nsec

4.75psec

±5%

Delay

Rise

Time

(ns)

Bandwidth

0

280

1.25

MHz

0.25

280

1.25

MHz

0.5

290

1.20

MHz

1.0

310

1.13

MHz

2.0

340

1.03

MHz

3.0

360

972

KHz

4.0

370

945

KHz

4.5

380

920

KHz

4.75

400

875

KHz

Linear

range

0

to

±10

volts.

0

to

±11

volts

maximum

Approximately

1

ohm,

short-circuit

protected

Integral

nonlinearity

less

than

±0.08%

from

0.1

to

10

volts

2-2

Temperai-ure

Stability

Operating

Temperature

Range

Input

and

Output

Connectors

Power

Requirements

Gain

shift

of

the

amplifier

is

less

than

±0.01%

per

°C;

and

additional

shift

of

-0,013%

per°C

should

be

expected

for

each

microsecond

of

delay

used.

0

to

5CPC

BNC

—

UG-1094

A/U

and

UG-1094/U

+24V

+12V

-12V

-24V

25

mA

14

mA

3

mA

37

mA

2.2

Mechanical

The

Model

427

is

housed

in

a

single-width

Nuclear

Standard

Module

(refer

to

USAEC

Report

TID-20893),

and

weighs

two

pounds.

The

Model

427

does

not

contain

a

power

supply

and

therefore

must

obtain

the

necessary

operating

power

from

the

Nuclear

Standard

Bin

and

Power

Supply,

ORTEC

Model

401/402.

All

signals

in

and

out

of

the

module

are

on

front

panel

BNC

connectors

and

the

input

power

is

via

the

AMP

202515-3

connector

on

the

rear

panel.

3-1

3.

INSTALLATION

3.1

General

Installation

Considerations

The

Model

427,

used

in

conjunction

with

a

Model

401/402

Bin

and

Power

Supply,

is

intended

for

rack

mounting,

and

therefore

it

is

necessary

to

ensure

that

vacuum

tube

equipment

operating

in

the

same

rack

with

the

Model

427

have

sufficient

cooling

air

circulating

to

prevent

any

localized

heating

of

the

all-transistor

cir

cuitry

used

throughout

the

module.

The

temperature

of

equipment

mounted

in

racks

can

easily

exceed

the

recommended

maximum

unless

precautions

are

taken.

The

Model

427

should

not

be

subjected

to

temperatures

in

excess

of

120PF

{5(fC).

3.2

Connection

to

Power

-

Nuclear

Standard

Bin,

ORTEC

Model

401/402

The

Model

427

contains

no

internal

power

supply,

and

therefore

must

obtain

power

from

a

Nuclear

Standard

Bin

and

Power

Supply

such

as

the

ORTEC

Model

401/402.

It

is

recommended

that

the

bin

power

supply

be

turned

off

when

inserting

or

removing

modules.

The

ORTEC

400

Series

is

designed

so

that

it

is

not

possible

to

overload

the

bin

power

supply

with

a

full

complement

of

modules

in

the

bin;

however,

this

may

not

be

true

when

the

bin

contains

modules

other

than

those

of

ORTEC

design,

and

in

such

cases,

the

power

supply

voltages

should

be

checked

after

the

insertion

of

modules.

The

ORTEC

Model

401/402

has

test

points

on

the

power

supply

control

panel

to

monitor

the

dc

voltages.

When

using

the

Model

427

outside

the

Model

401/402

Bin

and

Power

Supply,

be

sure

that

the

jumper

cable

used

properly

accounts

for

the

power

supply

grounding

circuits

provided

in

the

recommended

AEC

standards

of

TID-20893.

Both

clean

and

dirty

ground

connections

are

provided

to

ensure

proper

reference

voltage

feedback

into

the

power

supply,

and

these

must

be

preserved

in

remote

coble

installations.

Care

must

also

be

exercised

to

avoid

ground

loops

when

the

module

is

not

physically

in

the

bin.

3.3

Signal

Connections

to

Model

427

The

Model

427

input

is

compatible

with

all

linear

output

signals

of

the

ORTEC

400

Series

of

modular

electronic

instruments.

The

medium-speed

logic

pulse

of

the

400

Series

is

also

suitable

for

use

with

the

Model

427;

however,

the

rise

time

of

the

logic

pulse

will

be

increased

considerably

because

of

the

limited

bandwidth

of

the

Model

427.

(See

specifications

for

bandwidth

and

rise

time

vs

delay.)

The

signal

range

of

the

input

is

from

0

to

10

volts.

The

input

pulse

shape

can

be

as

wide

as

the

typical

preamplifier

output,

i.e.,

a

time

constant

of

50

microseconds,

or

as

narrow

as

300

to

400

nanoseconds.

The

connecting

coaxial

cable

should

be

terminated

in

its

characteristic

impedance

at

the

input

connector

when

cable

lengths

exceed

approximately

10

feet

(see

Figure

1),