HP 548A Service manual

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A

ND

SERVICE

M

ANUA

AL

LOGIC

CLIP

l

HEWLETT

|hﬁ_,

PACKARD

CERTIFICATION

Hewlett-Packard

Company

certifies

that

this

instrument

met

its

published

specifications

at

the

time

of

shipment

from

the

factory.

Hewlett-Packard

Company

further

certifies

that

its

calibration

measure-

ments

are

traceable

to

the

United

States

National

Bureau

of

Standards,

to

the

extent

allowed

by

the

Bureau’s

calibration

facility,

and

to

the

calibration

facilities

of

other

International

Standards

Organi-

zation

members.

WARRANTY

AND

ASSISTANCE

This

Hewlett-Packard

product

is

warranted

against defects

in

materials

and

workmanship

for

a

period

of

one

year

from

the

date

of

shipment

except

that

in

the

case

of

certain

components

listed

in

Section

|

of

this

manual,

the

warranty

shall be

for

the

specified

period.

Hewlett-Packard

will,

at

its

option,

repair

or

replace

products

which

prove

to

be

defective

during

the

warranty

period

provided

they

are

returned

to

Hewlett-Packard,

and

provided

the

preventive

maintenance

procedures

in

this

manual

are

followed.

Repairs

necessitated

by

misuse

of

the

product

are not

covered

by

this

warranty.

NO

OTHER

WARRAN-

TIES

ARE

EXPRESSED

OR

IMPLIED,

INCLUDING,

BUT

NOT

LIMITED

TO,

ThHE

IMPLIED

WARRAN-

TIES

OF

MERCHANTABILITY

AND

FITNESS

FOR

A

PARTICULAR

PURPOSE.

HEWLETT-PACKARD

IS

NOT

LIABLE

FOR

CONSEQUENTIAL

DAMAGES.

If

this

product

is

sold

as

part

of

a

Hewlett-Packard

integrated

instrument

system,

the

above

warranty

shall

not

be

applicable,

and

this

product

shall

be

covered

only

by

the

system

warranty.

Service

contracts

or

customer

assistance

agreements

are

available

for

Hewlett-Packard

products.

For

any

assistance,

contact

your

nearest

Hewlett-Packard

Sales

and

Service

Office.

Addresses

are

pro-

vided

at

the

back

of

this

manual.

010000-A~238

OPERATING

AND

SERVICE

MANUAL

LOGIC

CLIP

548A

548A

LOGIC

CLIP

INSTRUCTIONS

Printed:

JUN

1977

Manual

Part

No.

00548-90009

Microfiche

Part

No.

00548-90010

Printed

in

U.S.A.

Page

0

Model

548A

AUXILIARY

POWER

CONNECTOR

CAUTION

The

30

volts

maximum

input

to

the

548A

Logic

Clip

is

an

absolute

value

which

must

not

be

exceeded.

Any

application

of

a

dc

voltage

or

a

pulse

greater

than

30

volts

may

cause

permanent

damage

not

cov-

ered

by

warranty.

No

damge

will

occur

if

the

548A

is

clipped

directly

to

an

integrated

e

T

circuit

with

dc

voltages

up

to

30

volts

P

—

if

the

clip

is

removed

within

1

minute.

|

Test

leads

should

not

be

used

to

make

connections

to

the

548A

if

there

is

any

possibility

of

encoun-

tering

a

voltage

greater

than

18

volts

dc.

Test

lead

inductance

may

cause

noise

spikes

or

pulses

in

excess

of

30

volts

and

permanently

damage

the

logic

clip.

Figure

1.

HP

Model

548A

Logic

Clip

Model

548A

Page

1

APPLICATION

The

548A

Logic

Clip

light-emitting-diodes

(LED’s)

will

indicate

logic

levels

on

most

integrated

circuit

(IC)

logic

families,

including

TTL,

HTL, DTL,

CMQOS,

and

NMOS.

It

displays,

simultaneously,

logic

levels

for

all

8,

14

or

16

pins

of

a

dual

in-line

IC

which

operates

from

a

supply

of

4

to

18

volts.

The

clip

can

test

flip-flops,

gates,

counters,

buffers,

adders,

and

shift

registers.

All

16

input

gates

are

electronically

buffered

to

minimize

loading

on

any

IC

being

tested.

Sixteen

high-efficiency

LED’s

provide

HIGH

(LED

on)

and

LOW

(LED

off)

logic

level

indication.

No

power

supply

connections

are

necessary;

the

Logic

Clip

powers

itself

from

the

V.

and

ground

pins

of

the

IC

under

test.

NOTE:

Accidental

connection

of

up

to

+30

volts

on

548A

clip

pins

for

a

minute

will

not

damage

548A

circuits.

SPECIFICATIONS

Input

Protection:

30V

absolute

maximum

for

one minute.

Input

Current:

=15

uA

maximum

over

the

range

of

+0.5V

to

Vsupply

-

0-5V.

Supply

Voltage:

4

to

18V

across

any

two

pins.

Supply

Current:

50

mA

maximum

with

15

LED’s

on.

Auxiliary

Positive

Supply

Voltage:

+4.5

to

+20V

applied

to

connector

on

top

of

clip

(ground

supplied

by

IC

under

test).

Supply

must

be

at

least

1.5V

more

positive

than

any

pin

on

IC

under

test

to

prevent

drawing

power

from

the

IC.

Input

Threshold

Voltage

Range:

V55|,

x

(0.4

+

0.06).

Example:

at

+5Vgypply

LED’s

will

be

off

below

1.7V

and

on

above

2.3V.

Logic

Family

Compatibility:

DTL,

TTL,

HTL,

CMOS

and

NMOS

in

dual

in-line

packages

up

to

16

pins.

Operating

Temperature

Range:

0

to

55°C.

Indications:

LED

Indication

On

Pin

voltage

above

threshold

or

no

connection

(open)

Off

Pin

voltage

below

threshold

Dim

Pin

voltage

pulsating

Page

2

Model

548A

OPERATION

(See

Photo)

Squeeze

the

Logic

Clip

to

open

the

contact

jaws

and

place

the

clip

on

the

pins

of

the

IC

to

be

tested.

Pin-to-pin

contact

must

be

good.

The

LED’s

will

indicate

the

logic

level

(LED

on

=

logic

HIGH

and

LED

off

=

logic

LOW)

on

the

corresponding

IC

pin.

There

are

no

operating

controls

or

service

adjustments

on

the

clip.

OPERATION

WITH

AUXILIARY

POWER

SUPPLY

If

the

IC’s

being

tested

use

low

voltage

(below

4V)

or

if

power

may

not

be

drawn

from

circuit

under

test,

an

external

voltage

applied

to

the

548A

top

terminal

(see

photo)

allows

complete

use

of

the

clip.

Refer

to

the

“Specifications”

for

details.

An

auxiliary

power

cable

is

supplied

with

the

clip.

NOTE:

Input

threshold

with

auxiliary

power

supply

is

nominally

0.4

x

(Vgypply

-

0.8).

TESTING

If

faulty

operation

of

the

Logic

Clip

is

suspected,

each

pin

network

should

be

tested.

A

4

to

18

volt

supply

can

be

used

to

check

for

correct

operation.

With

the

supply

connected

across

any

two

pins,

the

V¢

LED

and

the

remaining

14

LED’s

should

light.

Ground

each

pin

separately

(except

the

V.

LED),

and

each

LED,

when

that

pin

is

grounded,

should

go

off.

A

separate

adjustable

voltage

power

supply

can

be

used

to

check

the

threshold

voltage

of

each

Logic

Clip

pin.

Test

leads

can

be

used

for

testing

provided

the

applied

voltage

does

not

exceed

18V

dc

maximum.

The

threshold

voltage

which

will

switch

one

LED

on

is

variable,

and

it

depends

on

the

IC

supply

voltage.

See

the

specifications.

Test

the

threshold

by

applying

a

steady

monitored

supply

voltage

to

a

pair

of

548A

pins

(e.g.,

+5

volts),

and

connect

a

monitored

variable

threshold

test

voltage

to

each

LED

pin

to

be

tested.

Increase

the

test

voltage

from

zero

and

note

the

threshold

voltage

(e.g.,

1.7

to

2.3

volts)

for

each

LED.

MAINTENANCE

The

Logic

Clip

internal

electronics

assembly

is

a

single

molded

part

and

is

not

repairable.

To

obtain

other

replace-

ment

parts,

address

inquiry

to

the

nearest

Hewlett-Packard

Sales

and

Service

Office.

Give

Logic

Clip

model

number

and

identify

parts

by

description.

HEWLETT-PACKARD

SALES

AND

SERVICE

OFFICES

To

obtain

servicing

information

and

order

replacement

parts,

contact

the

nearest

Hewlett-Packard

Sales

and

Service

Office

in

HP

Catalog,

or

contact

the

nearest

regional

office.

IN

THE

UNITED

STATES:

CALIFORNIA

3939

Lankershim

Blvd.

North

Hollywood

91604

GEORGIA

P.O.

Box

28234

450

Interstate

North

Atlanta

30328

ILLINOIS

5500

Howard

Street

Skokie

60076

NEW

JERSEY

W.

120

Century

Road

Paramus

07652

IN

CANADA:

QUEBEC

Hewlett-Packard

(Canada)

Ltd.

275

Hymus

Blvd.

Pointe

Claire

IN

EUROPE:

SWITZERLAND

Hewlett-Packard

(Schweiz)

AG

Rue

du

Bois-du-Lan

7

P.O.

Box

85

CH-1217

Meyrin

2

Geneva

IN

AFRICA,

ASIA,

AND

AUSTRALIA:

Hewlett-Packard

Intercontinental

3200

Hillview

Ave.

Palo

Alto,

California

94304

IN

CENTRAL

AND

SOUTH

AMERICA:

Hewlett-Packard

Intercontinental

3200

Hillview

Ave.

Palo

Alto,

California

94304

MARUAL

CHANGES

CHANGE

DATE:

Moy

5,

1983

MANUAL

DESCRIPTION

This

chonge

aupersedes

nll

ecarlier

EEEEREEEEEEEEEEEEEE

doted

changea,

®

INSTRUMENT:

518A

Logle

Clip

¥

.

Operating

and

Service

Monunl

*

#8%

Moke

all

changes

listed

as

"

"

ERRATA,

’

'

g

.

*

SERIAL

PREFIX:

None

'

.

0

*

DATE

PRINTED:t

JUN

1976

’

"

4P

PART

NO:

00548-90009

:

®

NICROFICHE

KOt

005/8-90010

.

N

EEEEREEEEEEE

NN

¢

INDICATES

NEW

OR

REVISED

ITEM

>

INDICATES

ACTION

TG

BE

TAKEN,

ERRATA

Page

|,

Specificutionst

>Change

"Input

Voltoge

Limit"

to

the

followling:

Input

Protection:

30V

asbsolute

maximum

for

1

minute,

>Change

"50

mA"

for

supply

current

to

"55

mAM,

Page

2,

Testing:

YAdd

the

following

sentence

at

the

end

of

the

[irst

paragraph

under

Testing

hend}

"Test

leads

caon

be

used

for

testing

provided

the

applied

voltage

does

not

exceced

18Y

dc

moximum,"

(é]

HEWLETT

P8

PACKARD

MANUAL

CHANGES

MODEL

%484

(00548-90009)

Page

&

Insert

this

Warning

nfter

the

Certificntfon/Warranty

and

Assistonce

which

is

on

the

inside

{'ront

cover,

WARN

ING

This

product

should

be

connected

to

o

power

source

that

is

sufficiently

isolnted

from

the

main

supply

to

prevent

the

risk

of

elnctriec

shack,

To

further

reduce

the

risk

of

eleastric

shock,

refer

to

the

service

manunl

for

the

equipment

under

test

(when

applicable)

nnd

follow

the

manufacturer's

service

and

snfety

precautions

particularly

when

voltoges

exceeding

30

VAMS

or

50°

VDC

are

present,

)

PACKARD

ai

Printed

in

U.S.A.

HEWLETT

|

Manual

Part

No.

00548-90009