Eg&g Ortec 476 User manual

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Modei

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Mult'pl^^xer/Routar

instruction

Manual

Model

476

Multiplexer/Router

Instruction

Manual

Printed

in

U.S.A.

3080

02C

0379

STANDARD

WARRANTY

FOR

EG&G

ORTEC

INSTRUMENTS

EG&G

ORTEC

warrants

that

the

items

will

be

delivered

free

from

defects

in

material

or

workmanship.

EG&G

ORTEC

makes

no

other

warranties,

express

or

implied,

and

specifically

NO

WARRANTY

OF

MERCHANTABILITY

OR

FITNESS

FOR

A

PARTICULAR

PURPOSE.

EG&G

ORTEC's

exclusive

liability

is

limited

to

repairing

or

replacing

at

EG&G

ORTEC's

option,

items

found

by

EG&G

ORTEC

to

be

defective

in

workmanship

or

materials

within

one

year

from

the

date

of

delivery.

EG&G

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

agree

ment

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

EG&G

ORTEC

fails

to

manufacture

or

deliver

items

called

for

in

this

agreement

or

purchase

order,

EG&G

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

EG&G

ORTEC

be

liable

for

special

or

consequential

damages.

QUALITY

CONTROL

Before

being

approved

for

shipment,

each

EG&G

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,

EG&G

ORTEC

must

be

informed,

either

in

writing

or

by

telephone

[(615)

482-4411],

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

EG&G

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

nearest

EG&G

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

will

be

repaired

at

the

standard

charge

unless

they

have

been

grossly

misused

or

mishandled,

in

which

case

the

user

will

be

notified

prior

to

the

repair

being

done.

A

quotation

will

be

sent

with

the

notification.

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

EG&G

ORTEC

of

the

circumstances

so

that

assistance

can

be

provided

in

making

damage

claims

and

in

providing

replacement

equipment

if

necessary.

Ill

CONTENTS

Page

WARRANTY

ii

PHOTOGRAPHS

iv

1.

DESCRIPTION

1

1.1.

Purpose

•

1

1.2.

Description

1

1.3.

1

2.

SPECIFICATIONS

1

2.1.

Performance

1

2.2.

Controls

2

2.3.

Internal

Jumpers

2

2.4.

Inputs

2

2.5.

Outputs

2

2.6.

Data

Bus

Connector

2

2.7.

Electrical

and

Mechanical

2

3.

INSTALLATION

3

3.1.

General

3

3.2.

Connection

to

Power

.

3

3.3.

Input

Interconnections

3

3.4.

Analyzer

Interconnections

3

3.5.

Internal

Jumper

Selections

3

3.6.

Internal

Time

Constant

Selections

4

4.

OPERATION

4

4.1.

Threshold

Adjustment

4

4.2.

Fine

Gain

Adjustments

4

4.3.

Operating

Procedures

4

5.

CIRCUIT

DESCRIPTION

4

5.1.

General

4

5.2.

Linear

Circuit

5

5.3.

Logic

Gates

5

5.4.

Routing

Generator

5

5.5.

Routing

Outputs

and

Handshake

Signals

5

5.6.

Internal

Power

Distribution

6

6.

FACTORY

SERVICE

6

APPENDIX

7

Schematic

476-0201-SI

nultiKexer

'•%

0

m

LINEAU

CUT

CCNTRCL

EG&G

ORTEC

MODEL

476

MULTIPLEXER/ROUTER

1.

DESCRIPTION

1.1.

PURPOSE

The

EG&G

ORTEC

476

Multiplexer/Router

is

a

modular

nuclear

instrument

that

will

interface

a

quantity

of

detec

tor-preamplifier-amplifier

circuits

into

a

single

data

accumulation

system

and

provide

for

simultaneous

stor

age

of

their

separate

spectra.

Each

of

the

detector-pre

amplifier-amplifier

circuits

is

connected

to

the

analyzer

through

one

of

the

multiple

channels

in

the

476.

The

476

then

provides

the

multiplexed

analog

signals

for

all

chan

nels,

together

with

logic

levels,

to

indicate

the

unique

channel

through

which

each

analog

signal

was

processed.

If

the

data

acquisition

system

is

set

to

respond

to

the

logic

signals

as

intended,

its

total

memory

is

subdivided

so

that

a

unique

spectrum

can

then

be

accumulated

for

the

sig

nals

from

each

of

the

detector-preamplifier-amplifier

channels.

There

are

three

basic

versions

of

the

EG&G

ORTEC

476

Multiplexer/Router.

The

476-04

includes

four

input

chan

nels:

the

476-08

includes

eight

channels:

and

the

476-16

includes

16

channels.

This

manual

will

discuss,

primarily,

the

476-16

version.

The

principles

of

operation

and

the

logic

are

similar

for

each

of

the

other

two

versions.

1.2.

PHYSICAL

DESCRIPTION

The

476

is

built

in

a

double-width

NIM

module

that

must

be

installed

in

a

standard

bin

and

power

supply

for

opera

tion.

All

of

the

input

signal

connections

are

included

on

the

front

panel,

together

with

individual

fine

gain

controls

for

each

channel

and

other

operator

controls.

The

multi

plexed

analog

output

and

the

binary-coded,

logic

channel

identification

output

are

on

the

rear

panel.

A

common

threshold

control

is

included

on

the

front

panel.

This

permits

the

operator

to

adjust

an

input

ampli

tude

threshold

for

all

channels:

it

is

normally

set

just

above

system

noise.

A

toggle

switch

permits

the

operator

to

select

any

single

channel,

together

with

the

rotary

selector

switch

at

the

upper

right,

so

that

its

gain

can

be

adjusted

conveniently.

The

toggle

switch

is

normally

set

at

the

Multiplex

position,

and

the

rotary

switch

is

ineffec

tive

since

all

channels

are

active.

1.3.

The

design

of

the

476

Multiplexer/Router

is

compatible

with

the

EG&G

ORTEC

7000

Series

Data

Acquisition

and

Analysis

Systems

(DAAS),

and

can

be

easily

customized

for

operation

with

other

multichannel

analyzer

systems

such

as

the

EG&G

ORTEC

6240B.

Internal

jumper

selec

tions

permit

the

subgroup

selections

to

affect

any

two,

three,

or

four

adjacent

address

bits

from

2®

through

2".

This

allows

subgroup

routing

to

be

used

for

a

wide

variety

of

total

memory

capacities,

which

are

available

in

these

analyzers.

Mode

selection

signals

and

timing

logic

signals

are

also

included

in

the

interconnections.

To

permit

very

large

systems

to

be

developed,

there

is

a

provision

for

jumper

selection

to

activate

a

particular

476

where

there

can

be

as

many

as

four

of

these

units

in

the

system.

This

provision

could

conceivably

permit

a

system

to

be

organized

with

as

many

as

48

separate

detector-

preamplifier-amplifier

input

channels

and

with

unique

storage

of

the

spectrum

from

each

channel.

2.

SPECIFICATIONS

2.1.

PERFORMANCE

MULTIPLEXING

CAPACITY

One

to

16

linear

(analog)

channels

in

the

476-16:8

channels

in

the

476-8:4

channels

in

the

476-4.

EXPANSION

CAPABILITY

Provisions

to

expand

to

three

multiplexing

modules.

ANALYZER

MODE

IDENTIFICATION

Jumper

selec

tions

to

identify

any

one

of

three

possible

analyzer

modes.

TIME

CONSTANT

Each

channel

includes

switching

to

match

the

time

constant

of

the

amplifier

from

which

the

signals

are

furnished:

1-,

2-,

3-,

or

6-^8

shaping

can

be

matched.

ISOLATION

Typically

65

dB

from

any

off-channel.

OPERATING

TEMPERATURE

0

to

50°

0

(273

-

323K).

DC

LEVEL

SHIFT

<0.1

mV/°G.

INTEGRAL

NONLINEARITY

<0.1%.

NOMINAL

GAIN

=

unity.

GAIN

STABILITY

50

ppm/°G.

GATING

Internal

logic

gates

an

analog

signal

through

the

476

for

the

identified

channel

only:

automatically

locks

out

response

in

all

other

channels.

Also

accepts

external

ADG

Busy

signal

to

inhibit

switching

of

analog

signals

until

the

ADG

has

finished

processing

the

signal.

2.2.

CONTROLS

CHANNEL

SELECT

Front

panel

rotary

switch

selects

any

single

channel

continuously

for

calibration

or

testing

purposes.

16-position

switch

in

the

476-16;

8

positions

in

the

476-8;

4

positions

in

the

476-4.

SINGLE

CHANNEL/NORMAL

MULTIPLEX

Front

panel

toggle

switch

allows

either

the

Channel

Select

switch

or

internal

logic

to

control

the

linear

gate

channel

selections.

THRESHOLD

Front

panel

discriminator

threshold

con

trol

common

to

all

channels;

10-turn

Helipot;

range

0

to

100

mV.

FINE

GAIN

Front

panel

20-turn

control

for

each

chan

nel,

used

to

trim

the

unity

gain

adjustment;

range

~±0.34%.

TIME

CONSTANT

A

4-section

miniature

slide

switch,

mounted

on

the

printed

circuit,

permits

selection

of

1,

2,

3,

or

6

ius

to

match

the

shaping

time

con

stant;

one

switch

assembly

for

each

channel.

2.3.

INTERNAL

JUMPERS

7010/6240B

Jumper

selects

either

polarity

of

strobe

signal

from

476

SELECT

Jumper

selects

which

of

four

possible

476

modules

is

active;

must

match

the

ADC

to

which

the

476

is

connected.

ROUTING

BITS

Jumpers

select

the

high

order

bits

for

routing

according

to

memory

capacity

and

number

of

subgroups;

select

4

adjacent

bits

for

16

subgroups,

3

bits

for

8

subgroups,

or

2

bits

for

4

subgroups;

available

bit

identities

are

from

FED8

through

FED15.

MODE

SELECTIONS

Jumper

selects

which

of

three

modes

is

identified

to

the

analyzer

from

the

476;

BM1

identifies

a

PHA

type

request

normally

not

used.

2.4.

INPUTS

LINEAR

INPUTS

One

BNC

connector

per

channel

on

the

front

panel

accepts

0-

to

10-V

positive

pulses

from

an

amplifier,

shaped

with

1-,

2-,

3-,

or

6-ais

time

constant

or

stretched

>2

^lS.

Z,„

~100n,

dc-coupled.

ADC

BUSY

Rear

panel

BNC

connector

accepts

an

ADC

Busy

signal

from

the

analyzer

to

hold

a

routing

signal

until

storage

is

complete.

CONTROL

Rear

panel

20-pin

connector

carries

ex

ternal

control

signals

for

logic

gates;

signals

are

listed

in

Table

2.1.

A

low

logic

level

on

the

corresponding

FEC

line

+1

disables

that

input.

(FEC0

inhibits

channel

1,

etc.)

2.5.

OUTPUTS

LINEAR

OUT

Rear

panel

BNC

provides

the

analog

out

put

to

be

used

as

an

ADC

input

in

the

GATE

OUT

Rear

panel

BNC

provides

a

logic

pulse

to

be

used

as

a

gate

input

to

the

ADC.

Nominally

+4

V

from

discriminator

crossing

of

a

valid

pulse

until

ADC

Busy

returns

to

false.

Table

2.1.

Front

End

Control

Bus.

Signal

1

Gnd

11

Gnd

2

FEC0

12

FEC8

3

FEC1

13

FEC9

4

FEC2

14

FEC10

5

FEC3

15

FEC

11

6

FEC4

16

FEC12

7

FEC5

17

FEC13

8

FEC6

18

FEC14

9

FEC7

19

FEC15

10

Gnd

20

Gnd

2.6.

DATA

BUS

CONNECTOR

DATA

BUS

Rear

panel

50-pin

connector

provides

both

data

and

handshake

signals

between

the

476

and

the

re

lated

analyzer;

assignments

are

listed

in

Table

2.2.

2.7.

ELECTRICAL

AND

MECHANICAL

POWER

REQUIREMENTS

+12

V,

220

mA;

-12

V,

45

mA;

+24

V,

160

mA;

-24

V,

40

mA.

DIMENSIONS

NIM-standard

double-width

module

(2.70

by

8.714

in.front

panel)

per

TID-20893

(Rev).

Table

2.2.

Front

End

Data

Bus.

Signal

1

FED0

26

BM01

2

FED1

27

BM02

3

FED2

28

GND

4

FED3

29

FERDY

5

FED4

30

GND

6

FED5

31

COMP

7

FED6

32

GND

8

FED7

33

STROBE

9

FED8

34

GND

10

FED9

35

ENAB

11

FED10

36

GND

12

FED11

37

SEL0

13

FED12

38

GND

14

FED13

39

SEL1

15

FED14

40

GND

16

FED15

41

SEL2

17

FED16

42

GND

18

FED17

43

SEL3

19

FED18

44

GND

20

FED19

45

ADC

READY

21

FED20

46

GND

22

FED21

47

TX

COMP

23

FED22

48

GND

24

FED23

49

ADCSTROBE

25

BMO0

50

GND

3.

INSTALLATION

3.1.

GENERAL

The

476

Multiplexer/Router

is

used

in

conjunction

with

a

NIM-standard

bin

and

power

supply,

such

as

the

EG&G

ORTEG

401/402

Series.

The

bin

and

power

supply

is

designed

for

rack

mounting:

therefore

if

any

other

in

struments

which

generate

heat

are

mounted

in

the

same

rack,

it

is

important

that

sufficient

circulating

air

pre

vents

any

localized

heating

of

the

solid-state

circuitry

used

in

the

476.

Precautions

should

be

taken

to

ensure

that

the

476

is

not

subjected

to

temperatures

in

excess

of

120°F

(50°

0).

3.2.

CONNECTION

TO

POWER

The

476

contains

no

power

supply

and

must

obtain

its

dc

operating

power

from

the

NIM

bin

and

power

supply

in

which

it

is

inserted

for

operation.

Always

turn

off

power

for

the

bin

power

supply

before

inserting

or

removing

any

modules.

The

EG&G

ORTEC

modules

are

designed

so

that

it

is

not

possible

to

overload

the

bin

power

supply

with

a

full

complement

of

modules

in

the

bin.

Since,

how

ever,

this

may

not

be

true

when

the

bin

contains

modules

other

than

those

of

EG&G

ORTEC

design,

power

supply

voltages

should

be

checked

after

modules

have

been

in

serted.

The

EG&G

ORTEG

401/402

Series

Bins

and

Power

Supplies

are

designed

with

test

points

on

the

power

supply

control

panel

so

that

these

dc

voltage

levels

may

be

monitored

easily.

3.3.

INPUT

INTERCONNECTIONS

The

inputs

that

are

furnished

from

shaping

and/or

biased

amplifiers

are

located

on

the

front

panel

of

the

476.

They

are

numbered

from

1

through

16

and

are

to

be

used

arbi

trarily

except

that

each

will

generate

a

routing

signal

according

to

its

sequential

significance.

For

example,

the

inputs

that

are

furnished

through

connectors

1

through

8

will

provide

a

false

signal

through

the

most

significant

bit

(of

4

bits)

to

select

a

memory

segment

within

the

first

half

of

the

available

memory.

Those

inputs

through

connec

tors

9

through

16

will

provide

a

true

signal

through

this

same

line

to

select

the

upper

half

of

the

available

memory.

Thus,

if

only

two

of

the

available

16

inputs

were

to

be

used,

and

the

memory

were

subdivided

into

halves,

the

input

connections

should

be

furnished

to

connectors

8

and

16

of

the

476.

This

basic

logic

can

be

extrapolated

for

other

configurations.

To

use

4

inputs

and

operate

the

memory

with

division

into

quadrants,

use

input

connectors

4,8,12,

and

16

on

the

476.

When

used

with

a

7000

Series

Analyzer,

this

is

software-controlied

and

does

not

apply.

The

ADG

Busy

input

on

the

rear

panel

can

accept

this

signal

from

the

to

aid

in

the

timing

of

the

internal

gating

logic

of

the

476.

This

connection

is

recom

mended.

3.4.

ANALYZER

INTERCONNECTIONS

The

Linear

Out

connector

on

the

476

rear

panel

is

the

source

of

analog

signals

to

be

used

for

the

ADG

input.

Use

93fi

cable

to

connect

the

476

Linear

Out

connector

to

the

ADG

Linear

Input.

Use

of

the

Gontrol

connector

on

the

476

rear

panel

is

op

tional.

If

it

is

used,

the

analyzer

can

provide

a

ground

level

through

any

of

its

16

control

lines

to

inhibit

transfer

of

signals

through

the

associated

476

channel(s).

A

cable,

terminated

with

20-pin

connectors,

is

furnished

to

permit

this

interconnection

between

the

476

and

the

7000

Series

DAAS.

The

50-pin

Data

Bus

connector

on

the

rear

panel

must

be

connected

to

the

analyzer

because

it

contains

the

hand

shake

and

control

signals

that

are

used

between

the

in

struments

as

well

as

the

routing

signals

that

are

generated

in

the

476.

A

cable,

terminated

with

50-pin

connectors,

is

furnished

for

this

interconnection.

The

use

of

the

routing

signals

is

optional,

since

the

476

can

be

used

to

accept

inputs

from

several

detectors

that

are

to

be

analyzed

in

a

single

spectrum;

this

effectively

increases

the

detection

efficiency

according

to

the

geometric

positioning

of

the

several

detectors.

However,

the

routing

signals

are

gener

ated

and

furnished

to

the

analyzer,

whether

they

are

used

or

not.

3.5.

INTERNAL

JUMPER

SELECTIONS

Provisions

are

included

on

the

printed

circuit

board

in

side

the

476

for

selections

of

various

operating

param

eters,

and

these

must

be

examined

and

revised

as

re

quired

by

the

specific

application.

One

jumper

selects

either

of

two

alternate

settings;

one

is

marked

7010

and

the

other

is

marked

6240B.

The

pur

pose

is

to

select

which

of

two

complementary

Strobe

signal

polarities

will

be

accepted

to

enable

routing

selec

tions.

The

high-true

signals

are

furnished

from

the

EG&G

ORTEG

7000

Series

DAAS,

while

the

low-true

signals

are

provided

from

the

EG&G

ORTEG

6240B

Multichannel

Analyzer.

The

resulting

polarity

of

the

ADG

STROBE

output

and

the

mode

output

selections

is

correct

for

the

7000

Series

applications;

these

signals

are

not

used

in

the

6240B

applications,

so

their

inverted

polarity

does

not

make

any

difference.

There

is

a

block

that

accommodates

4

jumpers,

associ

ated

with

the

input

lines

marked

SEL0

through

SEL3.

No

jumper

is

required

if

the

476

output

is

furnished

to

an

analyzer

with

a

single

ADG.

If

it

is

used

in

a

multiple-ADG

configuration,

the

ADG

that

is

used

in

conjunction

with

the

476

must

be

identified

(SEL0,

SEL1,

SEL2,

or

SEL3),

and

a

jumper

must

be

instailed

in

the

476

to

match

the

ADG

identity.

A

third

jumper

block

includes

three

alternate

jumper

locations.

When

the

476

is

shipped

from

the

factory,

a

jumper

is

installed

to

the

BM01

output

selection,

and

this

is

used

in

a

7000

Series

DAAS

to

identify

each

data

trans-

fer

as

a

PHA

type

request.

The

alternate

settings,

BMO0

and

BM02,

are

reserved

for

possible

future

operations

that

may

be

selected

in

the

7000

Series

DAAS.

The

largest

jumper

block

permits

the

four

available

rout

ing

output

bits

to

be

connected

across

to

any

four

adja-

cent

address

bits

within

the

limits

of

FEDS

through

FED

15.

When

the

unit

is

shipped

from

the

factory,

these

jumpers

are

set

to

select

FED12

through

FED15;

software

in

the

DAAS

may

be

used

to

translate

these

selections

to

the

four

most

significant

bits

in

whatever

memory

size

is

included.

If

desired,

the

four

jumpers

can

be

moved

to

any

four

adjacent

output

lines

within

the

range

that

is

identified.

3.6.

INTERNAL

TIME

CONSTANT

SELECTIONS

Each

channel

in

the

476

has

an

input

circuit

that

includes

a

group

of

four

time

constant

selection

switches.

These

are

miniature

slide

switches

mounted

across

the

bottom

of

the

printed

circuit.

The

switch

assembly

toward

the

rear

panel

is

associated

with

channel

0

(the

Linear

Input

1

connector),

and

the

assembly

toward

the

front

panel

is

used

for

the

highest

numbered

channel.

The

four

switches

in

each

assembly

are

numbered

(1,

2,

3,

and

4).

Only

one

of

these

four

switches

is

to

be

set

at

the

On

position.

Use

the

switch

that

is

appropriate

for

the

shaping

time

of

the

input

pulses.

Use

switch

1

if

the

input

is

shaped

with

a

l-^s

time

constant

or

if

it

is

stretched

for

at

least

2

/js.

Use

switch

2

if

the

input

has

2-fiS

shaping.

Use

switch

3

for

3

nS.

Use

switch

4

for

6-ns

shaping.

Note

that

the

shaping

time

constant

selection

for

each

channel

is

completely

independent

from

all

other

chan

nels.

4.

OPERATION

4.1.

THRESHOLD

ADJUSTMENT

The

Threshold

control

at

the

upper

left

on

the

front

panel

is

used

to

set

the

discrimination

level

just

above

the

sys

tem

noise,

and

this

is

common

to

all

input

channels.

The

range

for

this

control

is

0

to

100

mV,

which

should

be

adequate

for

any

normal

application.

4.2.

FINE

GAIN

ADJUSTMENTS

Each

channel

in

the

476

includes

a

Fine

Gain

screwdriver

control

on

the

front

panel.

This

control

is

used,

when

required,

to

equalize

small

differences

in

the

linear

gain

between

channels.

The

range

of

each

control

is

limited

to

±0.34%.

Larger

gain

changes

should

be

controlled

at

the

input

amplifier

in

the

system;

this

is

for

trim

purposes

only.

The

intended

gain

factor

for

each

signal

that

passes

through

the

linear

portion

of

the

476

is

unity.

The

effective

gain

through

each

channel

can

be

measured

by

setting

the

front

panel

toggle

switch

at

Channel

Select

and

then

turning

the

Channel

Selector

switch

to

each

channel

that

is

to

be

examined.

A

dynamic

check,

using

a

radioactive

source

to

affect

each

is

recommended.

When

the

testing

has

been

accomplished,

return

the

toggle

switch

to

Normal

Multiplex

(the

Channel

Selector

is

ineffective

for

this

toggle

switch

setting).

4.3.

OPERATING

PROCEDURES

After

the

476

has

been

installed

according

to

the

informa

tion

in

Section

3,

and

its

threshold

and

gain

adjustments

have

been

made,

no

further

operating

controls

are

re

quired.

Each

input

pulse

from

any

of

its

sources

will

trigger

a

logic

response

that

will

generate

a

routing

output

identification;

the

response

to

one

input

will

also

inhibit

any

input

pulse

through

an

alternate

channel

until

the

first

pulse

has

been

transferred

to

the

ADC.

The

Busy

indicator

on

the

476

front

panel

provides

a

visual

indi

cation

that

input

signal

amplitudes

are

exceeding

the

threshold;

it

can

be

used

as

an

aid

when

adjusting

the

Threshold

control.

The

internally

generated

routing

signal

is

also

used

to

gate

the

linear

signal

through

to

the

Linear

Out

connector

on

the

rear

panel.

5.

CIRCUIT

DESCRIPTION

5.1.

GENERAL

The

schematic

for

the

EG&G

ORTEC

476

Multiplexer/

Router

is

476-0201-S1,

included

at

the

back

of

this

manual.

All

the

circuits

are

included

on

the

single

printed

circuit

board

and

on

the

front

and

rear

panels.

The

follow

ing

parts

are

included

in

the

circuits:

1.

Sixteen

Linear

Input

circuits.

Each

input

signal

is

furnished

through

a

Fine

Gain

adjustment

and

into

an

analog

multiplexer.

The

logic

circuit

selects

one

of

the

16

inputs

according

to

a

4-line

binary

code

(the

internally

generated

routing

signal).

2.

Each

input

signal

is

also

furnished

into

a

logical

gate

that

identifies

the

channel

into

which

the

signal

is

re

ceived

and

permits

gating

for

that

signal

together

with

lockout

of

any

subsequent

input

signal(s)

until

the

first

has

been

transferred.

3.

A

routing

signal

generator,

using

16

input

lines

and

a

4-bit

binary

decoder;

also

accommodates

any

single

channel

selection.

4.

Routing

signal

output

circuit

and

analyzer

handshake

signals.

5.2.

LINEAR

CIRCUIT

Input

1

can

be

used

as

the

typical

circuit.

The

signal

passes

through

ONI

and

Fine

Gain

adjustment

R185

and

is

applied

to

one

of

the

16

inputs

of

101,

19.

When

all

four

levels

at

pins

14

through

17

are

high,

the

input

at

19

is

switched

through

to

28.

The

linear

signal

then

passes

through

A2

and

A1

to

provide

the

Linear

Out

sig

nal

through

CN17.

Each

alternate

input

circuit

is

identical

to

the

Input

1

cir

cuit.

The

selection

between

the

16

inputs

to

101

is

a

func

tion

of

the

binary-coded

levels

at

its

pins

14

through

17,

and

this

combination

is

generated

by

the

routing

signal

generator.

5.3.

LOGIC

GATES

Each

of

the

16

inputs

is

also

connected

to

a

gated

dis

criminator.

Input

1

can

again

be

used

as

the

typical

circuit.

The

input

signal

from

ONI

is

furnished

through

01

to

buffer-shaper

105-8

(the

section

of

105

that

includes

8

as

the

output).

The

shaped

output

from

105-8

is

fur

nished

into

discriminator

109-2,

where

it

is

compared

to

the

level

furnished

from

Threshold

control

R20;

when

109-2

triggers,

this

sets

flip-flop

1026-13.

1017-8

provides

a

low

level

to

10

of

1016

to

indicate

that

an

input

has

been

acknowledged

through

channel

0

(the

Input

1

in

ternal

circuit).

Integrated

circuit

1016

encodes

the

signal

from

its

10

for

its

3-line

binary

output

and

switches

the

level

at

its

15

to

high.

1015-8

switches

to

low

to

latch

the

binary

code

from

1016

through

1013,

where

it

will

remain

until

the

signal

initiates

a

new

sequence.

The

low

at

1015-8

also

triggers

two

monostables;

1039-7

turns

on

the

front

panel

Busy

indicator,

and

1039-9

generates

an

in

hibit

to

all

gates

through

1040-3

and

IO40-6;

no

new

input

pulse

can

initiate

a

response

until

the

gate

signal

has

been

released.

The

gate

signal

from

1039-9

is

gated

through

1040-3

together

with

the

level

furnished

through

the

ADO

Busy

input

circuit,

ONI8,

and

the

response

through

all

channels

can

thus

be

inhibited

until

the

ADO

Busy

returns

to

a

low

level

after

the

signal

has

been

processed.

If

the

circuits

through

the

rear

panel

control

connectorare

used,

the

FEO0

line

(Front

End

Oontrol

for

channel

0)

can

be

used

to

aid

in

determining

the

exact

reset

time

for

flip-flop

1026-13,

or

it

can

be

held

as

a

low

input

to

inhibit

any

response

through

channel

0

as

a

function

of

the

soft

ware

in

the

analyzer.

An

input

through

channel

1

to

7

(0N2

through

0N8)

will

generate

a

logic

response

through

its

unique

circuit

to

trigger

its

flip-flop

within

the

group

from

1026-9

through

1024-7,

and

the

result

will

be

encoded

in

1016

for

the

rout

ing

identity

to

1013,

and

the

gating

will

be

provided

in

the

same

manner

as

described

above.

An

input

to

channel

8

(0N9)

will

generate

a

response

through

1022-13

that

is

furnished

to

1011.

When

this

occurs,

1011

generates

the

encoded

output

through

its

pins

6,

7,

and

9

and

also

switches

its

pins

14

and

15

to

high.

The

high

at

1011-14

causes

latch

1013

to

look

at

the

inputs

from

1011

instead

of

those

from

1016.

The

high

at

1011-15

carries

through

1016

and

initiates

the

responses

for

1015-8.

An

input

through

channel

9

through

15

(ON10

through

0N16)

will

generate

a

logic

response

through

its

unique

circuit

and

trigger

its

flip-flop

within

the

group

from

1022-9

through

IO20-4,

and

the

result

will

be

en

coded

in

1011

for

the

routing

identity

and

control

to

1013

in

the

same

manner

as

described

for

a

signal

through

channel

8.

5.4.

ROUTING

GENERATOR

A

low-true

binary

code

for

channels

0

through

15

is

pro

vided

at

pins

15,14,13,

and

12,

respectively,

of

1013.

This

information

is

obtained

as

described

in

Section

5.3above.

The

channel

code

is

furnished

as

one

of

the

two

input

groups

to

multiplexer

1014.

If

1014-1

is

high,

this

input

is

transferred

directly

to

the

4-line

output

of

1014

and

used

as

the

routing

code.

The

alternate

input

to

1014

comes

from

1023

and

is

ac

cepted

when

1014-1

is

low.

1023

encodes

the

selection

of

switch

317,

in

which

settings

1

through

16

of

817

corre

spond

respectively

to

channels

0

through

15

as

decoded

by

10

23.

Switch

S18

determines

whether

1014-1

is

at

a

high

or

low

level.

When

it

is

set

at

Normal

Multiplex,

1014-1

is

high

and

the

output

is

the

channel

code

from

1013.

When

switch

SI8

is

set

at

Single

Obannel

Select,

1014-1

is

low

and

the

output

is

the

channel

code

from

1023.

The

4-llne

output

from

1014

is

furnished

through

inverters

to

control

the

selection

by

101

(see

Section

5.2).

It

is

also

furnished

to

four

OR

gates,

1018-3,

-6,

-11,

and

-8,

for

transfer

as

routing

output

signals.

The

common

control

line

to

these

four

gates

must

be

held

low

to

permit

the

transfer

of

the

routing

code.

5.5.

ROUTING

OUTPUTS

AND

HANDSHAKE

SIGNALS

A

strobe

signal

must

be

furnished

from

the

associated

ADO

to

complete

the

transfer

of

the

routing

output

in

formation.

This

will

be

furnished

from

the

ADO

in

re

sponse

to

the

Linear

Out

analog

signal

that

has

been

furnished

through

0N17

(see

Section

5.2).

Ifasystem

has

more

than

one

ADO,

the

correct

SEL

line

must

also

have

been

pulled

to

a

high

level

and

this

information

trans

ferred

through

an

internal

jumper

to

9

of

1027-8.

If

the

7010/6240B

jumper

has

been

set

at

6240B,

the

input

strobe

from

the

analyzer

is

a

low

level

and

will

enable

the

transfer

through

the

OR

gates

in

1018.

The

combination

of

FED

lines

that

carry

the

coded

routing

signal

is

deter-

mined

by

the

jumpers

(see

Section

3.5).

No

other

transfer

signals

are

used

in

the

6240B,

so

the

remaining

signals

are

of

no

consequence.

If

the

7010/6240B

jumper

has

been

set

at

7010,

the

input

strobe

from

the

analyzer

must

be

a

high

level

signal.

IC27-8

must

have

been

enabled

as

described

above,

and

its

output

switches

to

low

when

the

strobe

is

furnished.

The

low

at

IC27-8

enables

the

OR

gates

in

1018

to

transfer

the

coded

routing

signal.

It

also

provides

the

BM1

output

(if

the

jumper

is

set

as

shown

in

schematic

476-0201-SI)

to

identify

this

as

a

PHA

request

to

the

analyzer.

These

signals

are

used

only

when

an

EG&G

ORTEC

800

ADC

is

connected

to

a

7000

Series

analyzer

in

parallel

with

the

476.

When

the

800

ADC

generates

an

ADC

READY,

it

passes

through

the

476

to

generate

a

FERDY

signal

to

the

7000

to

indicate

that

the

800

ADC

has

data

ready

to

trans

fer

to

the

7000.

The

7000

then

generates

a

strobe

signal

to

gate

the

routing

information

onto

the

FED

lines:

it

is

also

inverted

and

passed

to

the

800

ADC

as

an

ADC

STRCBE

to

place

the

address

information

in

the

ADC

onto

the

low-order

FED

lines.

A

CCMP

signal

from

the

7000

indi

cates

that

the

address

transfer

is

finished

and

this

signal

is

inverted

and

passed

to

the

800

ADC

as

a

TXCCMPLETE

signal.

5.6.

INTERNAL

POWER

DISTRIBUTION

The

circuits

of

the

476

require

operating

do

power

levels

at

±12

V

and

±24

V,

furnished

directly

from

the

bin

power

supply,

and

at

+5

V.

The

+5

V

level

is

derived

from

the

+12

V

input

through

regulator

IC41.

6.

FACTORY

SERVICE

This

instrument

can

be

returned

to

the

EG&G

CRTEC

factory

forserviceand

repair

at

a

nominal

cost.

The

EG&G

CRTEC

standard

procedure

for

repair

ensures

that

the

same

quality

control

and

checkout

procedures

that

are

used

for

a

new

instrument

will

be

used

for

the

repaired

unit.

Always

contact

Customer

Services

at

EG&G

CRTEC,

(615)

482-4411,

before

sending

in

an

instrument

for

repair

to

obtain

shipping

instructions

and

so

that

the

required

Return

Authorization

Number

can

be

assigned

to

the

unit.

This

number

should

be

written

on

the

address

label

and

on

the

package.

APPENDIX

REPLACEABLE

PARTS

ORDERING

INFORMATION

The

Replaceable

Parts

List

shown

below

contains

Infor

mation

needed

for

ordering

spare

and/or

replacement

parts.

Each

listing

indicates

the

reference

designator

number,

the

part

number,

a

description

of

the

component,

and

the

part

manufacturer

and

manufacturer's

part

number.

All

inquiries

concerning

spare

and/or

replacement

parts

and

all

orders

for

same

should

include

the

model

serial,

and

revision

("Rev"

on

rear

panel)

numbers

of

the

instru

ments

involved

and

should

be

addressed

to

EG&G

ORTEC

Customer

Services

at

100

Midland

Road,

Oak

Ridge,

Tennessee

37830.

The

Manager

of

Customer

Ser

vices

can

be

reached

by

telephone

at

(615)

482-4411.

The

minimum

order

for

spare

and/or

replacement

parts

is

$50.00.

ORDERING

INFORMATION

FOR

PARTS

NOT

LISTED

In

order

to

facilitate

the

ordering

of

a

part

not

listed

below,

the

following

information

should

be

submitted

to

Cus

tomer

Services;

1.

the

instrument

model

number,

2.

the

instrument

serial

number,

3.

revision

("Rev"

on

rear

panel)

number,

4.

a

description

of

the

part,

5.

information

as

to

the

function

and

location

of

the

part.

The

solid-state-device

(diodes,

transistors,

and

integrated

circuits)

types

installed

in

your

instrument

may

differ

from

those

shown

in

the

schematic

diagram

and

parts

list.

In

such

cases,

necessary

replacements

can

be

made

with

either

the

type

shown

or

the

type

actually

installed

in

the

instrument.

Replaceable

Parts

List

EG&G

ORTEC

item

No.

All

Models

476-8

&

476-16

Only

Capacitors

3

pF

10%

471520

072

10

pF

5%

Mica

500

V

417010

071

39

pF

5%

Mica

468750

079

47

pF

5%

Mica

468420

05,

6,

13,

15

019,

25,27,

30

032,

36,

41, 43, 46,

53,

55,

58

220

pF

2%

Mica

500

V

417080

075,

81

■

500

pF

20%

Mica

500

V

408930

01,

4,

12,

14

017,

24,

26,

29

031,

35,

40, 42, 45,

52,54,

57

1000

pF

Disc

436370

059

10000

pF

Disc

436380

02,

3,

8,

10, 11,

16,

018,

20,

21, 22, 23,

28

033,

34,

37,38,

39,

44,47,

60, 62,

67,

70, 77,

84,

48,

49,

50, 51,

56

88,89,

90,

91,

92,

93,

94,

95.

96,

97

10

mF

10%

35

V

409440

07,

61,

63,65,66,

68,

69,

74,

78,

82,

85,86,

87

15

mF

10%

16

V

409490

064,

76

33

mF

10%

16

V

409520

080,

83

Indicator

LED

Indicator,

mounted

637980

D1

Integrated

Circuits

HA1-4625-5

450710

105

104

102,

3

HA1-4905-5

450700

109

108

106,

7

HD1-0165-5

450730

1023

HI1-506-5

450720

101

LM340T

5

V

Regulator

440440

1041

SN7400N

440730

1040

SN7417N

654600

1019,

28,

37,

38

8

Replaceable

Parts

List

(cont'd.)

EG&G

ORTEC

Item

No.

All

Models

476-8

&

476-16

Only

74LS00

495310

IC27

74LS04

604480

IC32,

33,

36

IC29

74LS08

604650

IC35

IC34

IC30,

31

74LS10

495290

IC17,

25

iCIO,

12,

21

74LS32

495280

IC18

74LS148

656030

IC11,

16

74LS157

495160

IC14

74LS279

449190

IC26

IC24

IC20,

22

74LS298

655990

IC13

74L10

663630

IC15

9602PC

637520

IC39

Inductors

2.2

Hybrid

Operational

Amplifiers

HOA0101

HOA0201

Transistors

FD1735

MPS6531

Resistor

Assemblies

Seven

each

5.1

K

Resistors

ion

5%

1/4W

cc

611770

LI,

2.

3

51

n

5%

1/4W

CC

lOOn

5%

3W

WW

igen

i%

i/sw

mf

t2

200n

20T

Trim

pot

200n

20T

Pot

330n

5%

1/4W

CC

422n

1%

1/8W

MF

T2

51

on

5%

1/4W

CC

51

in

1%

1/8W

MF

T2

562n

1%

1/8W

MF

T2

909n

1%

1/8W

MF

T2

IK

1%

1/8W

MF

T2

IK

5%

1/4W

CC

IK

10T

Pot

1.1K

1%

1/8W

MF

T2

1.21K

1%

1/8W

MF

T2

1.96K

1%

1/8W

MF

T2

2.37K

1%

1/8W

MF

T2

3.48K

1%

1/8W

MF

72

679310

A1

679300

A2

480180

Q2

436550

Q1,3

658480

RA2,

3,

4

402020

R8,

10.

21, 24,

226,

231,

232,

234,

236,

244, 245,

249,250,

251

402710

R1,

11,

27,

35,

186,

188, 190,

192

406940

R223

468330

R241

435630

R239,

242

435820

R20

402160

R183

467630

R248

402200

R22,

26,

43,

45

467490

R6,

16,

32,

40

468120

R246

468030

R237,

240

467420

R238

402260

R218,

222,

224

437550

R185,

187, 189,

191

468000

R235,

243

467560

R2,

7,

12,

18,

28,

34,36,

42

617100

R247

617110

R3,

13,

29,

37

621100

R4,

14,

30,

38

R54,

57,

66.

69

R48,

58,

72,

80,

194,

196,198,

200

R67,

70,

88,

90

R53,

63,

77,

85

R193,

195, 197,

199

R49,

56,

59,

65,

73,

79,

81,

87

R50,

60,

74,

82

R51,

61,

75,

83

RA1

R99,

102, 111, 114, 143,

146,155,

158

R93,

103, 117, 125, 137,

147,

161,169,

202,204,

206,208,210,212,

214,

216

R112,

115, 133, 135, 156,

159, 177,

179

R98,

108, 122, 130,

142,

152,

166,

174

R201,

203, 205, 207,

209,

211,

213,

215

R94,

101, 104,

110,

118,

124, 126,

132,

138,

145,

148, 154,

162,

168, 170,

176

R95,

105,

119, 127,

139,

149,163,

171

R96,

106,

120, 128, 140,

150,

164,

172

Replaceable

Parts

List

(cont'd.)

EG&G

ORTEC

Item

No.

All

Models

476-8

&

476-16

Only

4.64K

1%

1/8W

MF

T2

468020

R9,

17.

33,

41

R55,

64,

78,

86

R100,

109,

123, 131, 144,

153, 167,

175

5.1K

5%

1/4W

CC

402390

R47,

184,

217,

R92

220,

221,

228

6.81

K

1%

1/8W

MF

T2

467680

R19

7.5K

1%

1/8W

MF

T2

468230

R5,

15,

31,

39

R52,

62,

76,

84

R97,

107, 121,

129, 141,

151, 165,

173

10K

5%

1/4W

CC

402450

R219

15K

5%

1/4W

CC

402480

R181

51K

5%

1/4W

CC

402800

R182

75K

1%

1/8W

MFT2

451710

R233

100K

5%

1/4W

CC

402570

R23,

25,

44,

46

R68,

71,

89,

91

R113,

116, 134, 136,

157,

160, 178,

180

147K

1%

1/8W

MF

T2

617070

R225,

227

EG&G ORTEC 476 User manual

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