ORTEC 418A Service manual

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QfJYEC^

r^/si<s

20of

Model

418A

Universal

Coincidence

Operating

and

Service

Manual

S/V

Z/

/"V

US"

^09/r

Model

418A

Universal

Coincidence

Operating

and

Service

Manual

Printed

In

U.S.A.

ORTECf

Part

No.

733170

1202

Manual

Revision

B

Advanced

Measurement

Technology,

inc.

a/k/a/

ORTEC®,

a

subsidiary

of

AMETEK®,

Inc.

WARRANTY

ORTEC*

warrants

that

the

items

will

be

delivered

free

from

defects

in

material

or

workmanship.

ORTEC

makes

no

other

warranties,

express

or

implied,

and

specifically

NO

WARRANTY

OF

MERCHANTABILITY

OR

FITNESS

FOR

A

PARTICULAR

PURPOSE.

ORTEC's

exclusive

liability

is

limited

to

repairing

or

replacing

at

ORTEC's

option,

items

found

by

ORTEC

to

be

defective

in

workmanship

or

materials

within

one

year

from

the

date

of

delivery.

ORTEC's

liability

on

any

claim

of

any

kind,

including

negligence,

loss,

or

damages

arising

out

of,

connected

with,

or

from

the

performance

or

breach

thereof,

or

from

the

manufacture,

sale,

delivery,

resale,

repair,

or

use

of

any

item

or

services

covered

by

this

agreement

or

purchase

order,

shall

in

no

case

exceed

the

price

allocable

to

the

item

or

service

furnished

or

any

part

thereof

that

gives

rise

to

the

claim.

In

the

event

ORTEC

fails

to

manufacture

or

deliver

items

called

for

in

this

agreement

or

purchase

order,

ORTEC's

exclusive

liability

and

buyer's

exclusive

remedy

shall

be

release

of

the

buyer

from

the

obligation

to

pay

the

purchase

price.

In

no

event

shall

ORTEC

be

liable

for

special

or

consequential

damages.

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

If

it

becomes

necessary

to

return

this

instrument

for

repair,

it

is

essential

that

Customer

Services

be

contacted

in

advance

of

its

return

so

that

a

Return

Authorization

Number

can

be

assigned

to

the

unit.

Also,

ORTEC

must

be

informed,

either

in

writing,

by

telephone

[(865)

482-4411]

or

by

facsimile

transmission

[(865)

483-2133],

of

the

nature

of

the

fault

of

the

instrument

being

returned

and

of

the

model,

serial,

and

revision

("Rev"

on

rear

panel)

numbers.

Failure

to

do

so

may

cause

unnecessary

delays

in

getting

the

unit

repaired.

The

ORTEC

standard

procedure

requires

that

instruments

returned

for

repair

pass

the

same

quality

control

tests

that

are

used

for

new-production

instruments.

Instruments

that

are

returned

should

be

packed

so

that

they

will

withstand

normal

transit

handling

and

must

be

shipped

PREPAID

via

Air

Parcel

Post

or

United

Parcel

Service

to

the

designated

ORTEC

repair

center.

The

address

label

and

the

package

should

include

the

Return

Authorization

Number

assigned.

Instruments

being

returned

that

are

damaged

in

transit

due

to

inadequate

packing

will

be

repaired

at

the

sender's

expense,

and

it

will

be

the

sender's

responsibility

to

make

claim

with

the

shipper.

Instruments

not

in

warranty

should

follow

the

same

procedure

and

ORTEC

will

provide

a

quotation.

Damage

in

Transit

Shipments

should

be

examined

immediately

upon

receipt

for

evidence

of

external

or

concealed

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,

please

notify

ORTEC

of

the

circumstances

so

that

assistance

can

be

provided

in

making

damage

claims

and

in

providing

replacement

equipment,

if

necessary.

Copyright

©

2002,

Advanced

Measurement

Technology,

Inc.

All

rights

reserved.

*ORTEC®

is

a

registered

trademark

of

Advanced

Measurement

Technology.

Inc.

All

other

trademarks

used

herein

are

the

property

of

their

respective

owners.

Ill

CONTENTS

WARRANTY

ii

SAFETY

INSTRUCTIONS

AND

SYMBOLS

v

SAFETY

WARNINGS

AND

CLEANING

INSTRUCTIONS

vi

1.

DESCRIPTION

1

1.1.

GENERAL

1

1.2.

BASIC

FUNCTION

1

2.

SPECIFICATIONS

1

3.

INSTALLATION

2

3.1.

GENERAL

2

3.2.

CONNECTION

TO

POWER

2

3.3.

LOGIC

INPUTS

TO

THE

COINCIDENCE

UNIT

2

4.

OPERATING

INSTRUCTIONS

3

4.1.

FRONT

PANEL

CONTROLS

3

4.2.

CONNECTOR

DATA

3

4.3.

INITIAL

TESTING

AND

OBSERVATION

OF

PULSE

WAVEFORMS

3

4.4.

TYPICAL

OPERATING

CONSIDERATIONS

3

5.

CIRCUIT

DESCRIPTION

4

5.1.

INPUT

A

5

5.2.

INPUTS

B,C,D,

and

E

5

6.

CALIBRATION

AND

MAINTENANCE

6

6.1.

TESTING

PERFORMANCE

OF

SLOW

COINCIDENCE

6

6.2.

SUGGESTIONS

FOR

TROUBLESHOOTING

8

6.3.

TABULATED

TEST

POINT

VOLTAGES

ON

ETCHED

BOARD

8

^

#

r

o

Kk

IpJ

Al

SAFETY

INSTRUCTIONS

AND

SYMBOLS

This

manual

contains

up

to

three

levels

of

safety

instructions

that

must

be

observed

in

order

to

avoid

personal

injury

and/or

damage

to

equipment

or

other

property.

These

are:

DANGER

Indicates

a

hazard

that

could

result

in

death

or

serious

bodily

harm

if

the

safety

instruction

is

not

observed.

WARNING

Indicates

a

hazard

that

could

result

in

bodily

harm

if

the

safety

instruction

is

not

observed.

CAUTION

Indicates

a

hazard

that

could

result

in

property

damage

if

the

safety

instruction

is

not

observed.

Please

read

all

safety

instructions

carefully

and

make

sure

you

understand

them

fully

before

attempting

to

use

this

product.

In

addition,

the

following

symbol

may

appear

on

the

product:

ATTENTION-Refer

to

Manual

A

DANGER-Hlgh

Voltage

Please

read

all

safety

instructions

carefully

and

make

sure

you

understand

them

fully

before

attempting

to

use

this

product.

VI

SAFETY

WARNINGS

AND

CLEANING

INSTRUCTIONS

DANGER

Opening

the

cover

of

this

instrument

is

likely

to

expose

dangerous

voltages.

Disconnect

the

instrument

from

all

voltage

sources

while

it

is

being

opened.

WARNING

Using

this

instrument

in

a

manner

not

specified

by

the

manufacturer

may

impair

the

protection

provided

by

the

instrument.

Cleaning

Instructions

To

clean

the

instrument

exterior:

•

Unplug

the

instrument

from

the

ac

power

supply.

•

Remove

loose

dust

on

the

outside

of

the

instrument

with

a

lint-free

cloth.

•

Remove

remaining

dirt

with

a

lint-free

cloth

dampened

in

a

general-purpose

detergent

and

water

solution.

Do

not

use

abrasive

cleaners.

CAUTION

To

prevent

moisture

inside

of

the

instrument

during

external

cleaning,

use

only

enough

liquid

to

dampen

the

cloth

or

applicator.

•

Allow

the

instrument

to

dry

completely

before

reconnecting

it

to

the

power

source.

ORTEC

MODEL

418A

UNIVERSAL

COINCIDENCE

1.

DESCRIPTION

1.1.

GENERAL

The

ORTEC

418A

is

a

coincidence

unit

with

five

inputs.

Each

input

has

a

three-position

switch

associated

with

it

to

select

the

COINCIDENCE,

ANTICOINCIDENCE,

or

OFF

mode.

The

resolving

time

of

Input

A

is

controlled

by

a

front-panel

potentiometer

and

is

continuously

variable

from

100

ns

to

2

ps.

The

remaining

four

inputs

are

de

coupled

and

their

resolving

times

are

determined

by

their

input

pulse

widths.

By

means

of

a

front-panel

switch

1,2,3,4,

or

5

coincident

pulses

may

be

required

for

an

output

and

all

five

inputs

are

used

in

the

coincident

mode,

an

output

pulse

w

ill

be

obtained

when

a

coincident

occurs

between

anv

two

inputs.

Input

A

is

particularly

useful

for

anticoincidence

and

coincidence

strobe

operations

because

of

its

variable

resolving

time;

e.g.,

this

input

can

be

used

in

the

anticoincidence

m

ode

to

block

two

500-ns-wide

input

pulses

without

additional

external

pulse-shaping

equipment.

Two

positive

output

pulses

are

provided

on

BNC

connectors,

one

front

panel

and

one

rear

panel.

These

pulses

are

normally

500

ns

wide

but

their

width

can

be

altered

as

desired

by

changing

a

capacitor.

1.2.

BASIC

FUNCTION

The

418A

employs

an

"overlap"

type

of

coincidence

circuit.

Each

input

pulse

is

regenerated

into

a

current

pulse

which

has

a

fast

rise

and

fall

time.

These

current

pulses

are

fed

into

an

AND

circuit

which

produces

an

output

when

an

overlap

occurs.

The

width

of

the

current

pulse

from

Input

A

is

controlled

by

a

front-panel

potentiometer

and

can

be

varied

from

100

ns

to

2

jJs.

The

current

pulses

from

the

remaining

inputs

are

the

same

width

as

their

associated

input

pulses

at

the

1.8-V

level.

Since

these

inputs

are

dc-coupled,

their

current

pulses

can

be

made

infinitely

long

by

the

application

of

a

dc

voltage

to

the

input.

The

routing

of

the

individual

current

is

controlled

by

front-panel

toggle

switches.

They

can

be

routed

to

the

COINCIDENCE

or

AND

circuit,

ground

(OFF

position),

or

the

ANTICOINCIDENCE

circuit.

The

front-panel

COINCIDENCE

REQUIREMENTS

switch

alters

the

AND

circuits

so

that

1,2,3,4,

or

5

coincident

current

pulses

are

required

to

produce

an

output:

therefore

the

number

of

INPUT

CONTROL

toggle

switches

in

the

COINCIDENCE

position

must

be

equal

to

or

greater

than

the

number

selected

by

the

COINCIDENCE

REQUIREMENTS

switch

in

order

for

the

unit

to

produce

an

output.

A

current

pulse

routed

to

the

anticoincidence

circuit

blocks

all

pulses

routed

to

the

coincidence

circuit

for

the

duration

of

the

anticoincidence

pulse.

When

the

coincidence

requirements

are

met,

a

500-ns-wide

output

pulse

is

generated.

The

width

of

this

pulse

can

be

changed

as

desired

by

changing

the

value

of

capacitor

C9.

2.

SPECIFICATIONS

The

418A

is

housed

in

a

Nuclear

Standard

Module.

It

is

one

module

wide

and

weighs

1.5

lb.

It

contains

no

internal

power

supply

and

must

therefore

obtain

the

necessary

operating

power

from

the

Nuclear

Standard

Bin

and

Power

Supply,

ORTEC

4001A/4002A.

All

signals

in

and

out

of

the

module

are

on

front-panel

BNC

connectors,

and

an

additional

output

BNC

is

on

the

rear

panel.

PERFORMANCE

RESOLVING

TIME

(T).

INPUT

A

100

ns

to

2

[Js

controlled

by

20-turn

potentiometer.

INPUTS

B,C,D,E,

Controlled

by

input

pulse

width.

COINCIDENCE

REQUIREMENTS

Selectable

by

front-panel

switch;

i.e.,

1,

2,

3,

4,

or

5

coincident

pulses

may

be

required

to

yield

an

output.

For

example,

if

the

COINCIDENCE

REQUIREMENTS

switch

is

set

to

3

and

all

five

INPUT

CONTROL

switches

are

set

to

COINCIDENCE,

an

output

will

be

obtained

when

a

coincidence

occurs

between

anv

three

inputs.

INPUTS

POLARITY

Positive

2

V

minimum,

30

V

maximum.

PULSE

WIDTH

50

ns

to

dc.

IMPEDANCE

>1.5kQ,

dc-coupled

OUTPUTS

TEMPERATURE

STABILITY

Change

in

INPUT

A

resolving

time

(T)

is

less

than

0.1

%rC;

change

in

INPUTS

B,

C,

D,

and

E

resolving

time

(T)

is

less

than

0.5%/°C;

T

=

500

ns.

Two

each,

dc-coupled,

positive

5

V,

500

ns

wide;

impedance

<10Q.

MECHANICAL

AND

ELECTRICAL

OPERATING

TEMPERATURE

0

to

50°C.

CONTROLS

(INPUTS)

Each

input

has

a

three-position

locking

toggle

switch

associated

with

it

which

permits

any

input

to

be

used

in

the

COINCIDENCE,

ANTICOINCIDENCE,

or

OFF

mode.

When

the

OFF

mode

is

selected,

the

respective

input

is

disabled.

MECHANICAL

One

module

wide

and

designed

to

meet

the

recommended

interchangeab

ility

standards

set

forth

in

DOE

Report

TID-20893

(Rev.);

1.35

in.

Wide,

8.714

in.

High,

and

9.75

in.

Long.

POWER

REQUIREMENTS

+24

V,

105

mA;

+12

V,

50

mA;

-24

V,

90

mA;

-12

V,

30

mA.

3.

INSTALLATION

3.1.

GENERAL

The

418A,

used

in

conjunction

with

a

4001A/4002A

Bin

and

Power

Supply,

is

intended

for

rack

mounting;

therefore

any

vacuum

tube

equipment

operating

in

the

same

rack

must

be

sufficiently

cooled

with

circulating

air

to

prevent

any

localized

heating

of

the

all-transistor

circuitry

used

throughout

the

418A.

The

temperature

of

the

equipment

mounted

in

racks

can

easily

exceed

the

recommended

maximum

of

120°F

(50°C)

unless

precautions

are

taken.

3.2.

CONNECTION

TO

POWER

Because

the

418A

contains

no

internal

power

supply,

it

must

obtain

operating

power

from

the

Nuclear

Standard

Bin

and

Power

Supply

such

as

ORTEC

4001A/4002A.

It

is

recommended

that

the

bin

power

supply

be

turned

off

when

modules

are

inserted

or

removed.

The

ORTEC

NIM

modules

are

designed

so

that

it

is

not

possible

to

overload

the

NIM

power

supply

with

a

full

complement

of

modules

in

the

bin.

Since,

however,

this

may

not

be

true

when

the

bin

contains

modules

other

than

those

of

ORTEC

design,

power

supply

voltages

should

be

checked

after

the

modules

are

inserted.

ORTEC

4001A/4002A

has

test

points

on

the

power

supply

control

panel

to

monitor

the

dc

voltages.

3.3.

LOGICINPUTS

TO

THE

COINCIDENCE

UNIT

The

input

pulses

to

the

418A

may

come

from

any

source

of

logic

pulses.

The

input

impedance

is

approximately

2000Q,

and

some

care

must

be

given

to

ensure

that

reflections

do

not

occur

in

the

driving

transmission

cable.

Reflections

can

probably

best

be

avoided

by

terminating

the

driving

cable

at

the

inputs

with

the

characteristic

impedance

of

the

driving

cable.

The

amplitude

and

width

of

the

input

signals

are

specified

in

Section

2.2.

4.

OPERATING

INSTRUCTIONS

4.1.

FRONT

PANEL

CONTROLS

INPUT

A

RESOLVING

TIME

CONTROL

Each

input

pulse

is

regenerated

into

a

current

pulse

with

fast

rise

and

fall

times.

The

width

of

the

current

pulse

from

INPUT

A

is

continuously

variable

from

100

ns

to

2

fJ.

The

current

pulses

from

the

remaining

inputs

are

the

same

width

of

these

current

pulses

at

the

1.8-V

level.

The

width

of

these

current

pulses

determines

the

resolving

time

of

the

unit.

INPUT

A

RESOLVING

TIME

control

is

especially

useful

when

INPUT

A

is

used

in

the

anticoincidence

mode;

e.g.,

this

input

can

be

used

to

block

two

500-ns-wide

pulses

without

additional

external

pulse

shaping

equipment.

COINCIDENCE

REQUIREMENTS

The

position

of

this

switch

determines

the

number

of

coincidence

pulses

required

to

produce

an

output

pulse;

e.g.,

if

this

switch

is

in

the

2

position

and

all

input

control

switches

are

in

the

COINCIDENCE

position,

an

output

pulse

will

be

pr

educed

when

any

two

input

pulses

are

in

coincidence.

In

order

to

obtain

an

output

pulse,

the

number

of

input

control

switches

in

the

COINCIDENCE

position

must

always

be

equal

to

or

greater

than

the

number

of

selected

by

the

COINCIDENCE

REQUIREMENTS

switch.

INPUT

CONTROLS

Each

of

the

five

three-position

locking

toggle

switches

determines

the

routing

of

the

signal

applied

to

its

associated

input

connector.

The

three

positions

of

each

switch

and

their

function

are:

1.

COINCIDENCE

-

Input

signal

is

routed

to

the

coincidence

portion

of

the

circuit.

2.

OUT

-

Input

signal

is

routed

to

ground;

therefore

it

does

not

affect

the

coincidence

or

anticoincidence

portion

of

the

circuit

and

is

completely

out

of

the

system.

3.

ANTICOINCIDENCE

-

Input

signal

is

routed

to

the

anticoincidence

portion

of

the

circuit

and

will

block

all

coincidence

signals

for

the

duration

of

the

anticoinicdence

signal,

except

for

INPUT

A,

for

which

the

blocking

time

is

a

function

of

the

front-

panel

RESOLVING

TIME

control.

Any

combination

of

switch

positions

may

be

used;

however,

an

output

pulse

can

be

obtained

onlv

when

the

number

of

input

controls

in

the

COINCIDENCE

positions

is

equal

to

or

exceeds

the

number

selected

by

the

COINCIDENCE

REQUIREMENTS

switch.

4.2.

CONNECTOR

DATA

INPUT

A

is

a

front-panel

BNC

connector

de

coupled

to

the

internal

circuitry

and

has

an

impedance

to

ground

greater

than

1.5

kO.

To

minimize

reflections

when

driving

from

a

low-

impedance

source

into

this

connector,

a

terminator

equal

to

the

characteristics

impedance

of

the

driving

cable

should

be

shunted

to

ground.

A

positive

2-V

signal

with

a

minimum

width

of

50

ns

is

required

to

trigger

the

input

circuit.

The

resolving

time

of

INPUT

A

can

be

varied

from

ICQ

ns

to

2

|J

by

the

INPUT

A

RESQLVING

TIME

control.

INPUTS

B,C,D,E

-

Same

as

INPUT

A,

except

that

the

resolving

time

is

set

by

the

input

pulse

width.

OUTPUTS

Two

separate,

buffered,

dc-coupled

coincidence

outputs

are

provided

on

BNC

connectors.

The

output

pulses

are

5

V

in

amplitude

and

500

ns

wide.

The

output

pulse

width

can

be

altered

as

desired

by

changing

capacitor

09.

The

amplitude

can

be

increased

by

increasing

the

value

of

R75.

TEST

POINT

An

oscilloscope

test

point

is

provided

for

monitoring

the

output

signals.

The

test

point

has

a

470Q

resistor

connecting

it

to

the

associated

BNC

output

connector

on

the

front

panel.

4.3.

INITIAL

TESTING

AND

OBSERVATION

OF

PULSE

WAVEFORMS

Refer

to

Section

6

for

information

on

testing

performance

and

observing

waveforms.

4.4.

TYPICAL

OPERATING

CONSIDERATIONS

The

coincidence

circuit

is

an

overlap

type

or

it

can

be

described

as

an

AND

circuit.

The

2

T

resolving

time

of

INPUT

A

is

determined

by

the

INPUT

A

RESQLVING

TIME

control.

See

timing

diagrams

in

Figs.

4.1

through

4.5.