HP 546A Logic Pulser Operating And Service Manual

OPERATING

AND

SERVICE

MANUAL

LOGIC

PULSER

546A

Flio-

HEWLETT

PACKARD

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,orcontact

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
RueduBois-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

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

BureauofStandards,tothe

extent

allowedbythe

Bureau's

calibration

facility,

and

to the

calibration

facilitiesofother

International

Standards Organi-

zation members.

WARRANTY AND ASSISTANCE

This

Hewlett-Packard

productiswarranted against defects in materials and

workmanship

for

a period

of

one

year

from the dateofshipment.

Hewlett-Packard

will, at its

option,

repairorreplace

products

which

prove

to be defective

during

the

warranty

period provided

they

are returned to

Hewlett-Packard,

and prOVided the preventive

maintenance

proceduresinthis

manual are followed. Repairs necessitated

by misuse

of

the

product

are

not

covered

by

this

warranty.

NO

OTHER

WARRANTIES ARE EXPRESSED

OR IMPLIED,

INCLUDING,

BUT

NOT

LIMITED

TO,

THE

IMPLIED WARRANTIES OF

MERCHANT-

ABILITY

AND

FITNESS FOR A

PARTICULAR

PURPOSE.

HEWLETT-PACKARDISNOT

LIABLE

FOR

CONSEQUENTIAL

DAMAGES.

Service

contractsorcustomer

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 backofthis manual.

010000-A-237

This

change

supersedes

all

earlier

dated

changes.

***

Make

all

corrections

listed

under

ERRATA

before

making

other

changes.

********************

*

INSTRUMENT:

546A

*

*

Logic

Pulser

Operating

and *

*

Service

Manual *

* *

***

Check

following

table

for

your

instrument's

serial

prefix,

series

number,

or

date

code

and

make

listed

change(s)

to

manual.

*
*

SERIAL

PREFIX:

*

*

DATE

PRINTED:

*

HP

PART

NO:

*

MICROFICHE

NO:

* ********

1644

MAY

1977
00546-90005
00546-90006

*******

*

*
*

*.

*
*

* ***

n

INDICATES

NEWORREVISED

ITEM

>

INDICATES

ACTIONTOBE

TAKEN

00546-60100 ...1

Series

1732

SERIAL

PREFIX,

MANUAL

SERIES

NUMBER

OR

DATE

CODE

CHANGE(S)

thru

4

thru

5

thru

6

MANUAL

CHANGE(S)

..••1

thru

3

01A2132.
01A2312.
02A2312.

00546-60100 .

Series

2012

**
**

**

SERIAL

PREFIX,

**

SERIES

NUMBER

**

OR

DATE

CODE

**--------------------

**
**
**
**
**

...••

1,2

00546-60100

Series

2008

(C5460SX) 1=6809,6812/2=8886E/3=9712E/4=12414,12007/5=14585

Flin-

HEWLETT

PACKARD

MANUAL

CHANGES

MODEL

546A

(00546-90005)

Page

i

Insert

this

Warning

after

the

Certification/Warranty

and

Assistance

which

is

the

inside

front

cover.

WARNING

This

product

should

be

connected

to

a power

source

that

is.

sufficiently

isolated

from

the

main

supply

to

prevent

the

risk

of

electric

shock.

To

further

reduce

the

risk

of

electric

shock,

refer

to

the

service

manual

for

the

equipment

under

test

(when

applicable)

and

follow

the

manufacturer's

service

and

safety

precautions

particularly

when

voltages

exceeding

30

VRMSor50

VDC

are

present.

i

#ERRATA
Page

30,

Figure

14,

NOTE*:

>Change

note

to

read

"MP3

NOT

USEDINALL

PULSERS.

SEE

PAGE

33."

Page 33,

Table

6,

Replaceable

Parts:

>Change

HP

part

number

for

A1R4

to

0686-1325.

Page 36,

Figure

16,

A1

Schematic

Diagram:

>Add

two

short

parallel

arrows

adjacent

to

DS1

to

indicate

a

light

emitting

diode.

>Change

NOTE3to

"U1

PIN

12

MAYBECONNECTEDTOCOMMONINSOME

PULSERS".

>Add

"+"

symbol

adjacent

to

top

terminal

of

C2

to

indicate

the

positive

side

of.

the

electrolytic

capacitor

for

C2.

Page 32,

Table

6,

Replaceable

Parts:

>Change

A1MP1

from 00546-20202

to

0570-0662

in

HP

Part

Number

and Mfr.

Part

Number

columns.

CHANGE

1 (00546-60003

Series

1732)

NOTE

--

The

circuit

board

is

changed

mechanically

to

incorporate

an improved

push

switch.

The

new

00546-60003

circuit

board

is

electrically

identical

to

the

00546-60002

SERIES

1644

circuit

board.

CHANGE1(cont'd)
Page

30,

Figure

14,

Pulser

Disassembled:

>Change

MP4toMP14.

>Change

MP5toMP15.

>Change

MP8toMP9.

Page

32,

Table

6-1,

Replaceable

Parts:

>Change

A1

part

number from 00546-60002

to

00546-60003

for

HP

& Mfr.

Part

No.

>Change

A1

Series

number from 1644

to

1732.

Page 33,

Table

6,

A1

(00546-60100)

Replaceable

Parts:

>Change

A1S1

from 00546-00001

to

0546-00002

in

HP

and Mfr.

Part

Number

columns.

Page

33,

Table

6,

Miscellaneous

Parts:

>Change

MP4toMP14

and

Part

Number

in

HP

and Mfr. columns from 00546-20201

to

00546-20202.

>Change

MP5toMP15

and

Part

Number

in

HP

and Mfr. columns from 00545-20203

to

00545-20205.

>Change

MP8toMP9

and

Part

Number

in

HP

and Mfr. columns from 00546-40001

to

00546-40004.

>Add

MP10;

00546-40003;

RETAINER-SWITCH,

BLK

PLASTIC;

28480; 00546-40003.

>Add

MP11;

0624-0340; 2;

SCREW-SELF

TAPPING

0-42

(MP10

MTG);

28480;

0624-0340.

>Add

MP12;

7120-5268;

NAMEPLATE;

28480; 7120-5268

(BOTTOM

HALF).

>Add

MP13;

7120-5274;

LABEL-OPERATING:

28480; 7120-5274

(TOP

HALF).

-

1-

I

CHANGE1(cont'd)
Page 36,

Figure

16,

A1

Schematic

Diagram:

>Change

HP

Part

Number

for

A1

from 00546-60002

to

00546-60003

SERIES

1732.

>Add

to

arrows

by

DS1

to

indicate

a

LED.

>Change

"U1

PIN

2"

in

NOTE3to

U1

PIN

12.

CHANGE

2 (00546-60003

Series

200B)

Page 32,

Table

6,

Replaceable

Parts:

>Change

A1

from

series

1732

to

200B.

>Add

A1CB;

0160-0576;

CAPACITOR

FXD

0.1UF

20%

50VDC

CER;

26654;

2130BR050R104M.

Page 36,

Figure

16,

A1

Schematic

Diagram:

>Change

A1

series

number from 1732

to

200B.

>Add

0.1u

capacitor

CB

across

power

supply

input

between

emitter

of

Q3

and

circuit

board

common.

CHANGE

3 (00546-60003

Series

2012)

Page

32,

Table

6,

Replaceable

Parts:

>Change

Al

from

series

2008

to

2012.

>Change

A1C1

(0160-4422)

to

0160-5238;

CAPACITOR-FXD

.B2UF

20%

50VDC

DISC

CER.

Page 36,

Figure

16,

Al

Schematic

Diagram:

>ChangeAl

Series

from 2008

to

2016.

>Change

A1Cl

from

1uf

to

.82uf.

I

HCHANGE

4

Title

Page

SERIES

NUMBERS

NOT

LISTED:

>Change

to

read

as

follows:

For

Logic

Pulsers

with

series

numbers

higher

than

1644,

or

with

condensed

Series

Numbers

provided

on

the

Date

Code

label,

a

MANUAL

CHANGES

sheet

is

included

with

this

manual. For

series

numbers below 1644,

refer

to

the

Backdating

paragraph

in

this

manual.

Page 1

SERIES

NUMBER:

>Delete

the

paragraph

under

"SERIES

NUMBER".

>Replace

with

the

following

information:

SERIES/DATE

CODE

This

product

is

identified

byaSERIES

CODE

and

DATE

CODE,

located

on a

vinyl

label

affixed

to

the

inside

of

either

the

top

or

bottom

of

the

pulser

shell.

The

Series/Date

Code

format

used

in

all

logic

probes

is

as

follows:

"01A2132"

The

first

two

digits

represent

a

condensed

Series

Code.

When

a change

occurs

to

any model

of

HP

logic

probe

family

which

affects

the

schematic,

parts

list,

or

specifications,

the

condensed

SERIES

CODEisincremented

by

one.

The

letter

"A"

designates

the

country

of

origin;

"A"

indicates

USA.

I

CHANGE4(cont'd)

The

last

four

digits

represent

the

Date Code.

The

Date

Code

identifies

the

date-of-manufacture

for

the

pulser.

The

first

two

digits

indicate

the

year

the

product

was

manufactured;

the

last

two

digits

indicate

the

week

of

that

year.

Datecoding

originated

in

the

year

1960,

at

which

time

the

code

"00"

was used

for

the

first

two

digits

to

represent

1960. Every

year

after

1960

the

code

was

incremented

by

one;

for

example,

the

Date

Code

"2012"

indicates

the

product

was

manufactured

in

the

12th

week

of

the

year

1980

(1960+20).

Your

pulser

will

have

either

a

four-digit

Series

Number

stamped

on

the

printed

circuit

board

or

a condensed

Series

Code,

prefixing

the

Date

Code

on

a

vinyl

label

affixed

to

the

inside

of

the

pulser

shell.

WHICH

CHANGES

APPLYTOYOUR

LOGIC

PULSER?

There

isaSERIES/DATE

CODE

number

listed

on

the

cover

of

the

MANUAL

CHANGES

sheet.

As

changes

are

made,

the

condensed

Series

Code

is

incremented

by

one.

Make

all

changes

to

your manual

for

Series

Codes

less

than

or

equal

t(

your

pulser

Series/Date

Code.

CHANGE

5

Page 32 and 33,

Table

6.

Al

(00546-60003)

Replaceable

Parts:

>Change

C6

from 0160-4343

(.lUF)

to

0180-0291

lUF

+-10%

35

VDC

TA.

>Change

R3

from 0698-7284

(lOOK)

to

0698-7260

10K

1%

.05WFTC=O+-100.

Page 36,

Figure

16.

Al

Logic

Pulser

Assembly

Schematic

Diagram:

>Change

the

value

for

C6

from .1UF

to

lUF.

>Change

the

value

for

R3

from

lOOKto10K.

IICHANGE

6

On

the

Title

page,

Change

the

Configuration

Code

from

01Ato02A.

-

..

_------

Figure1.HP

546A

Logic

Pulser

SCOPE

OF

MANUAL

This manual provides

operating

and service

information

for

the

Hewlett-Packard

Model

546A

Logic

Pulser (Figure 1). The

information

includes a descriptionofthe

Logic Pulser, accessories available,

specifications, unpacking,

operating

characteristics,

operating

procedures, applications, theory

of

operation,

maintenance, replaceable parts, and a schematic diagram.

DESCRIPTION

The

HP

546A

Logic Pulserisa

hand-held

logic

node

stimulator

used

for

injecting

controlled

pulses

into

digital logic circuits. The electronics are housed in a

hand-held

probe.

Automatic

pulse

control

is

prov'ided

for

TTL,

OTL,

RTL,

HTL,

MaS,

and

CMOS

logic. Pulse

amplitude

depends

on

the logic

supply voltage (3-18V)

whichisalso

the

supply voltage

for

the Logic Pulser. Pulse

current

and pulse

width

depends on the load

being

pulsed. The

frequency

and

number

of

pulses generated by the

pulser

is

controlled

by

operationofa push-slide switchonthe pulser

probe.

A flashing

LED

indicator

located in the

tip

indicates

the

output

mode.

Refer

to

Table 1

for

Logic Pulser specifications and to

Figure 2

for

accessories available.

SERIES

NUMBER

The Logic Pulser does

not

have a serial

number.Itdoes have a

four

digit

series

number,

which

is

stamped on the

printed

circuit

board. Refer to this

number

and the

circuit

board part

number

in any

correspondence

pertainingtomaintenance.

Table1.Specifications

Output'

Logic

Family Power Supply Voltage

Output

Current

Pulse

Width

Typical

Output

Voltage

2

High

Low

TTL

5.0 ±10%

vdc

:5.650

mA

?0.5

j.ls

?3

vdc

:5.0.8

Vdc

CMOS

3-18

vdc

:5.100

mA

?5

j.ls

?Vsupply-1vdc

:5.0.5

vdc

15V

maximum

Tip

Output

Overload

Protection:

Power Supply

Input

Protection:

±25V

for

one

minute

±25V

for

one

minute

Short

Circuit

Protection:

Time

Base

Accuracy:

±10%

Continuous

Operating

Temperature:

0-55°C

Impedance:

<2 ohms active;

Accessory

Included:

Ground

Cable

>1

megohm

off

Assembly, HP Part No. 00545-60105

Power Supply

Requirements:

Accessory

Available:

Tip Set,

HP

Operating

Voltage Range:

Part No. 00545-60104

TTL

.................

5±

10%

vdc

CMOS

................

3-18

vdc

Operating

Current:

:5.35

mA

'Specifications

apply

over

stated

operating

voltages

and

temperatures

for

all

pulse

output

modes.

2With

ground

clip

attached

near

load.

Tip

Kit:

00545-60104

10526-60002

Multi-Pin Stimulus

Kit

Figure2.546A

Logic

Pulser Accessories

Available

UNPACKING

If

the

shipping

packageisdamaged,

ask

that

the

carrier's agent

be

present

when

the package

is

opened.

Inspect

the

Logic Pulser

for

obvious

physical damage (dents, scratches, etc.). If

the

Logic

Pulser

is

damaged

or

fails

to

meet

specifications,

notify

carrier and nearest Hewlett-Packard

Sales

and Service

office

immediately.

(Sales

and Service offices are listedatthe

backofthis manual.) Re-

tain

shipping

package and packaging material

for

carrier's inspection. The

Sales

and Service

office

will

arrange

for

replacement

of

your

Logic Pulser

without

waiting

for

claim against carriertobe

settled.

POWER

SUPPLY

The

power

leads are

connected

to

the

power

supplyofthe

logic

being

pulsed(3to

18V). Reverse

polarity

and excess voltage

protection

are

provided.

The red

power

leadisconnectedtothe

positive

side

of

the

power

supply.

OUTPUT

GROUND

CABLE

A

connector

for

the

ground

cable

providedislocatedatthe

tipofthe

Logic Pulser.

When

maximum

current

outputisdesired,

use

the

ground

cable supplied

with

the

Pulsertomake

the

common

return

path

as

shortaspossible.

Current

pulses

from

the

Pulser can be

more

than

650

mAo

The

ground

cable

reduces the

IR

drop

and

the

lead

inductance.

OPERATING

CHARACTERISTICS

The HP 546A Logic Pulser generates pulses

as

programmed

by a

fingertip

push-slide switch. The

Pulser

is

programmed

by

pushing

the

switch

once

for

each single pulse

output,

or

a specific

number

of

times

for

continuous

pulse streamsorpulse bursts at selected frequencies. The

numberoftimes

to

push

the

switchtoselectanoutput

modeislabeled adjacenttothe

switch andisdescribed in Table 2.

On

the

label a

dot

(e) represents a push; a dash

(-)

represents a

hold.Asshown in Table 2,

the

pulses

appliedtothe

LED

indicatorsinthe

tip

are slowed

down

for

visibility.

Pressing

the

switch

automatically

drives a TTL, DTL,orCMOS

logic

output

or

input

from

LOW

to

HIGHorfrom

HIGHtoLOW.

The

high

source and sink

current

capabilityofthe

Pulser can

override

integrated

circuit

output

points,

originallyineither

the

HIGHorLOW

state. The

nominal10jJ.s

pulse

width

is

long

enough

for

even slow

CMOS

circuitstoaccept,

but

heavy

circuit

loads (suchasTTL

drivers) result in

narrower

pulses that

limit

the

amountofenergy

deliveredtothe

device

under

test.

The Pulser's

outputisthree-state. In

the

off-state,

the

probe's

high

output

impedance

ensures that

circuit

operationisunaffected

by

probing

until

the

Pulser switchispressed. Pulses can

be

injected

while

the

circuitisoperating

and

no

disconnections

are

needed.

The

multi-pin

stimulus

kit

(Figure

2)

is

useful

for

stimulating

uptofour

inputsofa gate at

the

same

time,orfor

stimulating

four

different

circuit

nodes.

The Pulser's

power

input

and

output

(tip)

circuits are

protected

against

overvoltage

and reverse

polarity.

Switch Action

Output

Pulse Rate

Output

Pulse

Mode

LED

Indication

(±10%)

Push

single

1 Pulse

One

short

flash

Push-hold

100 Hz 100 Hz

(Continuous)

10

Hz

rate

Push/push-hold

100 Hz 100

Burst.

10 Hz

rate

during

burst

Push/push/push-hold

10 Hz 10 Hz

(Continuous)

5 Hz

rate

Push/push/push/

100 Hz

10 Burst •

Two

short

flashes

and

push-hold

a

l-second

pause

Push/push/push/

1 Hz 1 Hz

(Continuous)

One

flash/second

push/push-hold

• 1

second

burst

for 100

pulses

every

two

seconds

.

• 0.1

second

burstof10

pulses

once

each

second.

(

0

1

10

Hz

rrn,ill

546A

LOGIC

PULSER

]

z

100

-

'0

BURST

.. -

0

100

aURST . ,

H'

....

HEWLETT·PACKARD

A push-push action

of

the switch must

occur

within

less

than 1 second to be effective.

A

hold

actionofthe

switch

for

greater than 1 second begins executionofthe

pro-

grammed

output.

Any

function

can be locked on by the push-slide actionofthe

switch.

Releasing

the

switch

midway

through

a burst does

not

terminate

the

burst.

The single pulses generated

when

a burstisprogrammed

are subtracted

from

the

first burst, e.g., a

100

burstisoutputas1-1-98, lOa, lOa, etc.

Releasing the switch in any

output

mode

other

than

midburst

terminates

output

and allows a

new

mode

to

be

programmed

immediately. Releasing the switch

for

longer than 1 second, erases the

programmingofprevious pushes.

(3)

(4)

(5)

(6)

OPERATING PROCEDURES

To operate the Pulser, observe

the

following

procedures:

NOTE

In the

following

step, be sure to

connect

the red

power

leadofthe Pulser

to

the positive sideofthe

powersupply.

a.

Connect

the

power

leads

of

the

pulser

to

the

power

supply

of

the

logic being pulsed

(3to18V). (The Pulser may be

powered

fromadifferent

source,

provided

the voltageisthe

same

as

thatofthe

circuit

under

test and a

common

groundisused.)

b.

Contact

the

logic

nodetobe stimulated

with

the

tipofthe

Pulser.

c.

program the generation

of

pulses by pushing

the

switch

per

adjacent markings (refer

to

Table 2

for

details). Characteristicsofthe

switch

operation

are described in the

following

steps.

(1)

(2)

ing

the

lamp flash bursts allows

controlofa precise

numberofoutput

pulses.

APPI.ICA

liONS

Hewlett-Packard makes several instruments

which

assist

the

troubleshooter

in testing logic circuitry

with

the Logic Pulser. These instruments are listed in Table 3 and examplesoftheir

applications are

given in

the

following

paragraphs.

Table3.Logic

Test

Instruments

. Typical Digital

Ie

HP Instruments

Troubleshooting

Stimulus

Response

Shorted IC

Input

546A Pulser

547A

Current

Tracer and

545A Logic Probe

Stuck Data

Bus

546A Pulser

545A Logic Probe and
547ACurrent

Tracer

Internal

Open

in IC

546A Pulser

545A Logic Probe

Solder Bridge

546A Pulser

547A

Current

Tracer

Sequential Logic Fault

546A Pulser

548A Logic

Clip

ShortstoVccorGround

546A Pulser

545A Logic Probe

Multi-Pin

Testing 546A Pulser 10529A Logic

Comparator

Logic Gate Testing

A logic gate may be tested by pulsing the gate's

input,

while

monitoring

the

output

with

a Logic Probe

(see

Figure 3). The Logic Pulser generates a pulse opposite

to

the stateofthe

input

line and can

change the gate

output's

state. This assumes the

outputofthe gateisnot

clamped in its state by an-

other

input,

e.g., a HIGHonthe

other

inputofan

OR gate.

SL

SL

NO

CHANGE

OF

STATE, INVERTER

IS FAULTY

GATE UNDER
TEST

Figure3.Logic

Gate

Testing

If

the pulseisnot

detected at the

output,

pulse the

output

line

(see

Figure

4).

If the

outputisnot

shortedtoVccor

common

return,

the Logic Probe should indicate a pulse opposite to

its

original

indi-

cation.Ifnot,

check

for

external shorts (solder bridges, etc.)

before

removing the integrated circuit.

Refer also

to

Gate-to-Gate Faults paragraph.

I

I

H

L

PROBE

PULSE SWITCH

IS

PROBE

LIGHT

DOES NOT

CHANGE

STATE:

LINE

IS SHORTED

TO

Vee

OR

GROUND.

Figure4.Testing

for

Shorts

Counter, Shift Register, and Flip-Flop Testing

MSI

Ie's,

suchasshift registers and counters, typically have several

output

pins

where

data must be

monitored

when

testing. The Logic Pulser, usedasa manually

controlled

clock, allows the Logic Clip

to simultaneously examine all

output

dataatrates

convenient

for

viewing.

When

the Logic

Clipisplaced

on

an

IC, the

LED's

on

the

clip
indicate the logic stateofeach
pin

(see Figure 5).Asthe Pulser

clocks . the

input,

the

indi-

cationsonthe

Clip

can be

com-

paredtoa

truth

table.

Figure

5.

Multi-pin

Testing

with

Logic

Clip

The 10529A Logic

Comparator

(Figure6)is

an

IC

troubleshooting

tool

that electrically compares a

reference IC

to

an

IC

under

test. The reference IC shares the

power

and

input

signals

with

the test

Ie.

When

comparing the outputsofthe

two

Ie's,

any level

difference

existing

for

0.2

j.lsormore

will

lightanLEDonthe comparator, thereby indicating a fault.

The Logic Pulser allows

in-cir-

cuit

stimulation,

so

test pulses

may be

introduced

at

circuit
nodes. Thus, resetorsynchro-
nizing pulses may be injected

to

reset the comparator's IC to

the

same initial stateasthe test

Ie.
This allows the reference IC
and

the

test ICtobegin

oper-

ation

from

the same reference

point.

Figure6.Multi-pin

Testing

with

Logic

Comparator

Wire-AND

Node

Oneofthe

most

difficult

problems

encounteredintroubleshooting

integrated

circuitsisa stuck

wire-

AND

node.

Typically J

oneofthe

open-collector

gates may still

continue

sinking

current

after it

has

been

turned

off.

The Logic Pulser and

Current

Tracer

providesaneasy

methodofidentifying

the

fault

gate.

Referring

to

Figure 7 place

the

Current

Traceronthe

gate sideofthe

pull-up

resistor.

Align

the mark

on

the

probe

tip

along

the

lengthofthe

printed-circuit

trace and adjust

the

probe's

sensitivity

control

until

the

indicatorisjust

fully

lighted.Ifthe

indicator

will

not

light

- use a Logic Pulser

programmed

to

the.100 Hz

continuous

modetoexcite

the

line.

Place

the

tracer

tip

on

the

output

pinofeach gate;

only

the

faulty gate

will

cause

the

indicatortolight.

Gate-to-Gate

Faults

Whenalow-impedance

fault

exists

between

two

gates

J

the

Current

Tracer and Logic Pulser

combine

to

quickly

pinpoint

the

defect.

In Figure 8 gate A's

outputisshorted to

ground.

Place the pulse

mid-

way

between

the

two

gates and place

the

Current

Tracer's

tiponthe

Pulser's

pin.

Pulse

the

line in

the

100

Hz

continuous

mode

and adjust

the

Current

TracerJs

sensitivity

control

until

the

indicator

just

lights. First place

the

Current

Tracer

tip

nexttogate A and

then

gate B

while

continuing

to excite the

trace. The tracer

will

light

only

on

the

gate A sideJsince gate AJ(the

defect

in this example),issink-

ing

the

majorityofthe

current.

+5V

LOGIC PULSER
(IF NECESSARY)

CURRENT

PATH

TRACER

WILL

LIGHT

HERE

BUT NOT ON OTHER GATES

Figure7.Wire-AND

Node

Fault

LOGIC
PULSER

CURRENT
TRACER

THE

MAJORITYOFPULSE CURRENT

"oWS'"W'''coYcmA

]

I

¢

Figure8.Gate-to-Gate

Faults

LOGIC

PULSER

The

major

circuitsofthe

Pulser are

contained

in integrated

circuit

U1asshown in

Figure

9.

Operating

voltageissupplied by a

power

supply and

outputs

are senttothe

output

drive

circuits andtothe dis-

play LED's.

Power Supply

The

power

supply converts

thedcinput

voltagetoa regulated voltage

for

low

power

logic. The

circuit

provides reverse voltage and overvoltage

protection.

Integrated Circuit U1

Several

functions

are

provided

by

U1asdescribed in

the

following

paragraphs.

VOLTAGE REGULATOR. Provides voltage and

temperature

compensated reference and

control

cir-

cuitry

for

the

low

voltage

logiconthe

Ie.

MODE

SELECT

CONTROL

Determines

whether

the

instrumentisprogrammingamodeorexecut-

ing a

mode

and

whentoreset.

SWITCH INPUT

CONTROL

Presets

the

time

base/counter

and burst

control

circuit;

generates a

single-shot pulse

to

the

output

and

debounces

the

switch.

L

I---

TIP

OUTPUT

DRIVE

CIRCUITS

DISPLAY

'"

I/

I

DISPLAY

DRIVE

MODE

SELECT

CONTROL _

I

L

/1"

I

-Ir-"-R-O-M

.......: ...-__-_-_-_

-....,

0"""

I

,..

CONTROL

-,

L

f--

I

I

I L '-----' I

I I

1-

BURST TIME BASEl

"+-t-t----l

I _ COUNTER r CLOCK I

I I

POWER

SUPPLY

k--------:=I

I

VOLTAGE

REGULATOR

V+

Figure9.Pulser

Block

Diagram

BURST

CONTROL.

Controls

the

start, stop, and

countofa burst.

DISPLAY

DRIVE.

Controls

the

LED

displaytoindicate

Pulser activity.

ROM. A 256-bit special purpose

read-only-memory

that

controls

the

operationofthe Pulser.

TIME

BASE/COUNTER.

Usedastime

base

for

the

ROMtogenerate the 1, 10, and

100Hzcontinuous

stream pulses,asa

counter

for

the

burst counts and

for

overall system

timing.

CLOCK.

Free-running

100

Hz

RC

controlled

clock actsasa

time

base

for

operationofthe

Pulser.

OUTPUT. Provides single positive and negative pulses at

controlled

rates, widths, and levelstothe

output

drive

circuits.

Senses

the

charge

deliveredtothe

external load and

will

automatically terminate

(shutdown),anoutput

that exceeds a

predetermined

limit.

Detailed Circuit Analysis

As shown in

Figure

16, transistor

Q3isa series

pass

element

for

a voltage

regulatorinUl

which

generates a 2.7

volt

reference

voltage. Resistor

R4

acts

as

a series

pass

helper

resistor,

diverting

someofthe heat

normally

generated in

Q3,

especially at high voltage. Capacitors

C5

and C7 act

as

low

impedance

filter

capacitors

to

the

2.7

volt

supply. The

LED

for

DSlisdriven

by a switchable

constant

current

driver

on

U1

to

indicate

the

output

mode.Adifference

exists

between

the

light

output

of

the

LED

and

the

tip

output

of

the

probe.

Since

the

human

eye

cannot

see a

100

Hz,

10

J.ls

blink,

the

LED

pulses are actually slowed

down

and stretched,

driving

the

LEData slower

rate,

indicating

the

particular

activity at

the

tip. Switch

S1isused

to

program

the

modeofU1.

Resistor

R3

and capacitor C6 are

the

timing

elements

that

control

the

accuracy and

frequency

of

the

voltage and

temperature

compensated 100

Hz

clock in

Ul.

OUTPUT

STAGE.

(Pins 2,1,16,15.)

Capacitor

C2isa charge storage

capacitor

thatischarged

through

an

internal

resistortothe

supply

voltage

(V+j,

the

"1"

output

level. This capacitor allows

the

Pulser

to

delivery

high

output

current

without

causing heavy surges

on

the

power

lead. Breakdown

diode

CRl

protects

Ul(l)

from

high

voltages. Transistor

Qlisthe

drive

transistor

for

the

logic

"1"

pulse and

Q2isthe

drive

transitor

for

the

logic

"a" pulse.

CapacitorCland resistorRlare

coupling

elements

to

the

tipofthe

probe.

CapacitorCldecouples

highdclevels

from

the

tipofthe

probetothe

output

cir-

cuitry

and also actsasan

overload

sensing

element,

activating

the

shutdown

circuitryinUl

(pin 16).

Between

output

cycles resistor R1 discharges any residual chargeoncapacitor

Cl.

ResistorR2limits the

current

into

Ul

on

this sense

line,

and capacitor

C3isa

speedup

capacitor. Capacitor C4

on

pin

14

controls

the

normal

output

pulse

width

of

both

the

"1"

and "a"

throughaone-shotinUl,

typically

10).Ls

(may vary

between

5-15

).Ls).

ResistorR5stabilizes

the

output

stage.

Overcurrent

Output

Shutdown

If

the

circuit

under

test presentsanoverloadtothe

Pulser's

output,

a sensing

circuit

within

Ul

causes

the

overcurrent

shutdown

cycletooccur

and

turn

off

the

output

transistor.Ifthe

overload

presents a

low

impedance

to

V+,

the

"a"

overcurrent

cycle occurs.Ifthe

load presents a

low

impedance

to

ground,

the

"1"

overcurrent

cycle occurs. These cycles are described in

the

following

paragraphs.

Waveforms

of

the

overcurrent

conditions

are

shown

under

test

procedure

paragraphs.

Immediately

priortoany

output

pulse cycle, capacitor C2ischargedtoV+,

capacitorClis

discharged

by resistor

Rl

to

avolts, transistors

Ql

and

Q2

are

off

and

Ul

pin16isatthe

tip

voltage.

U1

(pin

16)

begins measuring

voltage

on

the

tip

through

resistorR2and capacitor C3.

With

transistor

Q2

conducting

heavy

current

from

the

load

through

the

tip,

capacitor C2 develops a voltage charge.

When

this voltage reaches

approximately

0.8 volts (relativetoground)

pulse

shutdown

occurs in

the

U1

sensing

circuit

and transistor

Q2

turns

off.

"1"

OVERCURRENT CYCLE. The

"1"

cycleissimilar

to

the

"0"

cycle except that transistor

Q1

saturates,

the

direction

of

current

flowisreversed and

the

shutdown

threshold

voltageisreferenced

to

V+

(set to

approximately

V+

minus

1.5 volts).Inaddition,

capacitorC2supplies mostofthe

output

current

through

transistor Q1 thus

reducing

current

surges

on

the

V+

line.

In

either

overcurrent

cycle

the

fast

turn

on

and

turn

offoftransistors Q1 and

Q2

provides sharp pulse

edge transitions

through

logic

threshold

transition

regions. The

"1"

or

"0"

overcurrent

output

cycle

is

repeated each

timeahigh

current

pulseisoutputted.

MAINTENANCE

The

following

paragraphs

provide

test

procedures,

probe

disassembly and assembly and parts re-

placement

information.

Test Procedures

The

following

performance

tests ensure that

the

Pulserisoperating

properly.

Test

equipment

re-

quiredislisted in Table4.Test

equipment

having

equivalent

characteristics may be substituted.

NOTE

The

HP

180C

oscilloscope

listed in Table 4isrecommended

as a usually

available

type.

However,astorage

scope

suchasthe

HP

181Aispreferable

to

use

for

the

performance

tests.

Table4.Test

Equipment

Required

Instrument

Required Characteristics

RecommendedHPType

Oscilloscope

35

MHz,10mV/div,

0.1

I.<s/div

180C/1807A/1821A

Power

Supply

0-20V,O-lA

6201B

Counter

0-10

MHz

5300B/5301A

Resistor

TRMR, 200, 10%

2100-2413

Resistor

6.2.0, 5%, .25W

0683-0625

Resistor 3.6.0, 5%, .25W

0683-0365

Resistor

(2)

lK,

5%, .25W

0683-1025

Capacitor

10

MF,

±10%,

20V

0180-0374

Functional Output Test

Using the test setup shown in Figure 10,

proceedasfollows:

a.

Set

power

supplyto+5V.

b.

Press

Pulser

pushbutton

and latch

(100

Hz mode)

while

observing oscilloscope

for

the wave-

form

shown in Figure 10.

c. The Pulser

LED's

should

flash

once

when

the

pushbuttonispressed and

continuously

when

the

switchislatched.

d. Repeat step (b)

while

varying

the

power

supply

output

over

the

rangeof3to18

volts and

check

waveform.

Change

the

scope vertical scale

factorasrequired.

The

output

pulse

width

will

normally

decrease in

the15to18volt

range.

"0"

Output Pulse at

5V

Test

Connect

the

equipmentasshown

in

Figure

11

and

proceedasfollows:

a.

Set

the

power

supplyto+5V.

b.

Press

Pulser

pushbutton

and latch

while

observing oscilloscope

for

the waveform shown in

Figure 11.

l80C/
l807A/1821A

SCOPE

NOTE:

KEEP

LEADS SHORT

rnrn

546A

+5V

62018

POWER

SUPPLY

1V/DIV
5/LS/DIV

OV

Figure

10.

Functional

Output

Test

6.2.11

180e/
1807A/1821 A

SCOPE

10M.

20V

iIJJ]]

546A

+5V

62016

POWER

SUPPLY

lV/DIV
O.51J.S/DI V

NOTE:

KEEP

LEADS

SHORT

OV

Figure 11.

"0"

Output

Pulse

at

5V Test Setup

"0"

Output

Pulse

at 12V Test

Connect

the

equipmentasshown in

Figure

12

and

proceedasfollows:

a.

Set

the

power

supplyto+12V and set

the

variable resistorto200

ohms.

b.

Press

Pulser

pushbutton

and latch

while

observing oscilloscope

for

waveform

A,

Figure

12.

"0"

Output

Pulse

at 12V and Variable

Load

Test

Connect

the

equipmentasshown in

Figure

12

and proceedasfollows:

a.

Set

the

power

supplyto+12V.

b.

Press

Pulser

pushbutton

and latch.

c.

Set

the

variable resistortothe

values listed

below

while

observing the oscilloscope

for

the

out-

puts shown in

waveformBfrom

lefttorightinorderofthe

values listed

below:

10

ohms

50

ohms

100

ohms

200

ohms

62018

0-200.11

+12V

POWER

r----..f)N'--------------------=-----l

SUPPL Y

180e!
1807A!1821A

seOPE

NOTE: KEEP LEADS SHORT

546A

2V/DIV
2/lS!DIV

OV

B

2V!DIV
2/lS!DIV

OV

Figure

12.

"On

Output

Pulse

at

12V

Test Setup

"1"

Output Pulse Test

Connect

the

equipmentasshown

in

Figure

13

(except

omit

the

counter)

and

proceedasfollows:

a.

Set

the

power

supplyto+5V.

b. Set

the

variable resistorto0 ohms.

c.

Press

Pulser

pushbutton

and latch

while

observing

oscilloscope

for

waveform

A,

Figure 13.

d. Set

power

supplyto+12V and variable resistorto200

ohms

while

observing oscilloscope

for

waveformB,Figure

13.

e. Set

the

variable resistortothe

values listed

below

and observe

the

oscilloscope

for

the

out-

puts shown in

waveformCfrom

lefttorightinorderofthe

values listed

below:

10

ohms

50

ohms

100

ohms

200

ohms

Frequency and

Mode

Test

Connect

the

counterinthe

test setup

shown

in

Figure

13

and

proceedasfollows:

a.

Set

the

power

supplyto+5V.

b. Set

the

variable resistorto200

ohms.

c. Set

counter

in Totalize

mode.

d.

Press

Pulser

pushbutton

and release

while

observing

counter.

The

counter

should totalize

each repeated

action.

e. Program

the

Pulser

per

the

switch

action

column

in Table2.The

counter

should

indicate

the

frequency

and burst

action

showninthe

table.

180C/

62018

53008/5301 A

1807A/1821A

B-u

POWER

SCOPE

SUPPLY

NOTE:

KEEP

LEADS SHORT

EIlJJl

546A

3.6S1

1V/DIV

2V/DIV

2V/DIV

A

O.5/JS/DIV

B

2/JS/DIV

C

2/JS/DJ V

5V

''1''

SHUTDOWN

OV

OV

OV

12V

"1"

OUTPUT

12V

"1"

FAMILY

OUTPUTS

Figure 13.

u1"

Output

Pulse Test Setup

To disassemble the Pulser refer

to

Figure

14

and proceedasfollows:

a.

With

fingers, unscrew (ccw) the Pulser

tip

(MP1).

b. Remove

indicator

window

(MP2).

Note

position

of

slots inside

window

for

reference

when

pulseristo

be reassembled.Ifwindow

hasaprotruding

rear stud} skiptostep d.

c.

With

Pulser

tip,

carefully remove retainer ring (MP3).

d. Slide

bottom

shell (MP5)

off

the Pulser.

e.

Lift

top

shell (MP4)

off

the

Pulser.

PULSER

ASSEMBLY

Pulser assemblyisessentially

the

reverseofthe

above disassembly

procedure.

CAUTION

BE

CAREFUL

WHEN

REPLACING

PARTS

ON

THE

FRAGILE

PRINTED-

CIRCUIT

BOARD.

EXCESS

HEAT

CAN

RUIN

THE

BOARD.

USEALOW

WATTAGE

($.25

WATTS)

IRON

AND

APPLY

THE

MINIMUM

HEAT

NECESSARYTOUNSOLDER

THE

LEADS.

MP7

TIP

COVER

NOT

SHOWN.

*NOTE

MP3

NOT

USED

IN

ALL

PULSERS.

SEE PAGE

23.

MP6

/

-

-

Figure

14. Pulser Disassembled

TROUBLESHOOTING

To

troubleshootamalfunctioninthe

Pulser's

operation,

conduct

the

performance

tests to

determine

specific symptoms

then

refertoTable 5

for

the

most likely causeofthe

problem.

NOTE

To check integrated

circuit

U1, measure the voltageatpin5for

2.7 (±O.3)

volts. Check

pin7with

a scope

for

the clock

waveform

shownonthe

sche-

matic diagram.

Table

5.

Troubleshooting

Isolation

Symptom Check (in order listed)

No

output-no

LED

indication

Power cable W2, U1, Q3,

51,

C6, C5,

R3,

and

C7

No

"1"or"0"

output

U1, C1,

Q2, Q1,

and

C4

No

"1"

output

Q1, U1, CR1, C2, and

R5

No

"0"

output

Q2

and

U1

Overcurrent

shutdown

failstooperate U1, C1, and

R2

Program

mode

failure

U1, Q3, and

51

Qty

Description

Designation

Number

Code

Part Number

Al

00546-60002

1

Logic

Pulser

Assembly (Series 1644)

28480 00546-60002

A1Cl

0160-4422 1

Capacitor

Fxd, 1 UF,

±20%,

50V

28480

0160-4422

A1C2 0180-0690 1

Capacitor

Fxd, 2.2 UF, ±20%,

20V

28480 0180-0690

A1C3 0160-4545

1

Capacitor

Fxd, 220

PF,

±20%,

50V

28480

0160-4545

A1C4 0160-3879 1

Capacitor

Fxd,

.01

UF, ±20%, 100V

28480

0160-3879

A1C5

0180-2623

1

Capacitor

Fxd, 12 UF, ±10%,

6V

28480

0180-2623

A1C6

0160-4343 1

Capacitor

Fxd, 0.1 UF,

±5%,

100V

28480

0160-4343

A1C7 0160-0576 1

Capacitor

Fxd, 0.1 UF, ±20%,

50V

26654 2130BR050Rl04M

A1CRl 1902-3205 1

Diode,

Zener,

15.0V, 5%, 400MW

04713

SZ10939-233

A1DSl 1990-0582

1

LED,

Red

28480

1990-0582

A

lJl

1251-4259 1

Connector,

Sgl

Contact

71279

460-2983-01-03

A1MPl

00545-20202 1

Stud,

Tip

28480

00545-20202

A1Ql

1853-0271

1 Transistor, PNP,

51

04713

2N4403

A1Q2

1854-0568

1 Transistor, NPN,

51

28480

2N5845A

A1Q3

1853-0389 1

Transistor, PNP,

51

28480

1853-0389

Reference HP Part

Qty

Description

Mfr Mfr

Designation Number

Code Part Number

A1R1 0698-5999 1

Resistor, 470-D, 5%,

1/8W

01121 BB4725

A1R2 0698-5426 1 Resistor, 10KD, 10%,

1/8W

01121

BB1031

A1R3 0698-7284

1

Resistor, 100KD, 2%, .05W

24545

C3-1/8-

TO-1003-G

A1R4 0698-1325 1

Resistor,

1300D, 5%, 112W

01121

EB1325

A1R5 0698-3111 1 Resistor, 30D, 5%,

1/8W

01121 BB3005

A1Sl

00546-00001 1

Switch,

push/Slide

28480

00546-00001

A1U1

1820-1487

1

Ie,

Bipolar 28480 1820-1487

MISCELLANEOUS

PARTS

MP1 5060-0418 1

Tip

Assembly

28480

5060-0418

MP2 00546-40002

1

Window

28480 00546-40002

MP3.

00545-20204 1

Ring,

Retainer

28480 00545-20204

MP4

00546-20201

1

Body,

Top

Half 28480 00546-20201

MP5 00545-20203 1 Body,

Bottom

Half 28480 00545-20203

MP6

10230-62101 2

Grabber

28480

10230-62101

MP7

00547-40005 1

Cover,

Tip 28480 00547-40005

MP8 00546-40001 1

SWitch,

Slider

28480 00546-40001

W1 00547-60100 1

Cable

Assembly,

Probe

28480 00547-60100

W2

00545-60105 1

Cable

Assembly

with

Grabber

28480

00545-60105

.NOT

NEEDED

WITH 00546-40002

WINDOW

WHICH

HAS

PROTRUDING STUD

ON

REAR.

IF

00545-40001

WINDOW

(LESS

REAR

STUD)ISUSED, MP3ISREQUIRED.

Mfr

No.

01121

24546

26654

28480

-71279

04713

Manufacturer Name Address

Allen-Bradley

Co.,

Milwaukee,

WI

Corning

Glass

Works

(Bradford),

Bradford,

PA

VaradyneInc.,

Capacitor

Division,

Santa

Monica,

CA

Hewlett-Packard

Co.

Corporate

Hq.,

Palo

Alto,

CA

Cambridge

Thermionic

Corp.,

Cambridge,

MA

Motorola

Semiconductor

Products,

Phoenix,

AZ

Zip

Code

53212

16701

90404

94304

02138

85008

PART

NO.

00546-60002

CIRCUIT

BOARD

SERIES

1624

AND

1644.

(LIGHT

EMITTING

DIODE

DS2

ONLYINSERIES 1624)

PART

NO. 00546-60001

CIRCUIT

BOARD

SERIES

1608,1616.

AND

1624.

(BREAKDOWN

DIODE

CR1

ONLYINSERIES 1624)

Figure 15. Pulser

Component

Locators

I

JI

I

00546-8-3

R2

10K

1. REFERENCE

DESIGNATIONS

WITHIN

THIS

ASSEMBLY ARE

ABBREVIATED.

ADD

ASSEMBLY NUMBER TO

ABBREVIATION

FOR COMPLETE DESCRIPTION.

2.

UNLESS OTHERWISE

INDICATED:
RESISTANCE IN OHMS;
CAPACITANCE IN PICOFARADS

Ul

PIN 2

MAYBECONNECTED TO

COMMON IN SOME PULSERS.

R3
lOOK

3.

6

13

7

CLOCK

2

CRI

R5

QI

15V

30

I

UI

I

16

C3

I

220

CI

III

)---7

TIP

14

8

15

OV

051

+

C5

C7

12#

.111

2.7±0.3V

/

5

NOTE

3

12

4

3

O.5V/DIV
5MS/DIV

1300

Figure

16.

A 1 Logic Pulser Assembly (00546-60002) Series 1644, Schematic Diagram

To

adapt

this

manualtothe

circuit

boardsinTable8}perform

the

backdating

changes

that

applytothe

circuit

boardinyour

Pulser.

Table 8.

Manual

Backdating

Ckt

Bd

Manual

Part

No.

Series

No.

Backdating

Changes

00546-60001 1608or1616

1,

2,3

00546-60001 1624

1, 2

00546-60002

1624

1

CHANGE 1 (00546-60002 Series 1624)

Page 32,

Table6,Replaceable

Parts:

Change

A1

series

number

to

1624.

Add

A1DS2; 1990-0582; 1;

LED,

Red.

Page 36, Figure 16, A1

Schematic

Diagram:

Change

A1

series

number

to

1624.

Add

DS2

LEDinparallel

with

DS1.

Change

A1C3to0160-3878;

Capacitor,

Fxd, .001 UF, 20%, 100V; 28480; 0160-3878.

Change

A1C4

quantitytotwo.

Change

A1C7to0160-3879;

Capacitor,

Fxd,

.01

UF, 20%, 100V; 28480; 0160-3879.

Change

A1CR1to1920-3234;

Diode,

Zener,

19.6V 5%; 04713; SZ10939-266.

Change

A1Q1to1853-0390;

Transistor,PNP,

SI, 2N6067; 28480; 1853-0390.

Delete

A1R5

resistor

HP Part

Number

0698-3111 (30

ohms).

Page

36, Figure 16, A1

Schematic

Diagram:

Change

A-I

Part

Number,attopofdiagram,to00546-60001 (Series 1624).

Change

A1C3to.001

i-LF

and

A1C7to.01

i-LF.

Change

A1CR1to19.6V.

DeleteA1R5

and

connect

A1Q1

base

directlytoA1U1pin 1.

CHANGE 3 (00546-60001 Series 1608 and 1616)

Page

32,

Table6,Replaceable

Parts:

Change

A1

series

numbertoSeries 1608

and

1616.

Delete

A1CR1

breakdown

diode

HP Part

No.

1902-3234.

Page

36, Figure 16, A1

Schematic

Diagram:

Change

A1

series

numbertoSeries 1608

and

1616.

Delete

A1CR1

breakdown

diode.

LOGIC

PULSER

OPERATING AND

SERVICE

MANUAL

SERIES

NUMBER: 1644

This

manual

applies

directly

to

Hewlett-Packard

Model

546A Logic

Pulsers

having

the

above

series

number.

SERIES

NUMBERS

NOT

LISTED

For

series

numbers

higher

than

1644, a

"Manual

Change"

sheet

is

included

with

this

manual.

For

series

numbers

below

1644,

refer

to

Backdating

paragraphinthis

manual.

Copyright

HEWLETT·PACKARD

COMPANY

1976

5301

STEVENS

CREEK

BLVD.,

SANTA

CLARA,

CALIF.

95050

Printed:

MAY

1977

MANUAL

PART

NO.

00546-90005

MICROFICHE

PART

NO.

00546-90006

PRINTEDINU.S.A.

HEWLETT

PACKARD

Title

Page

ScopeofManual

1

Description 1

Series

Number

1

Unpacking

4

Power Supply 4

Output

Ground

Table.

.............................................................. 4

Operating

Characteristics 5

Operating

Procedures 7

Applrcations 8

Logic Gate Testing 9
Counter,

Shift Register, and Flip-Flop Testing

11

Logic

Comparator

12

Wire-AND

Node

13

Gate-to-Gate Faults

13

TheoryofOperation

16

Power Supply

16

Integrated

Circuit

U1

16

Detailed

Circuit

Analysis

18

Overcurrent

Output

Shutdown

19

Title

Page

Maintenance

20

Test

Procedures

20

Functional

Output

Test 22

"0"

Output

Pulseat5V

Test

22

"0"

Output

Pulseat12V Test

25

"0"

Output

Pulseat12V

and

Variable

Load Test

25

"1"

Output

Pulse Test 27

Frequency

and

Mode

Test.

......................................................27

Pulser Disassembly 29
Pu

Iser

Assembly

29

Troubleshooting

31

Backdating

(Older

Pulsers)

37

IJ

1.

2.

3.

4.

5.

6.

7.

8.

Specifications 2
Output

Mode

Selection 6

Logic Test Instruments 8

Test

Equipment

Required

21

Troubleshooting

Isolation

31

Replaceable

Parts

List

32

Manufacturers

Code

List

34

Manual

Backdating

37

Figure

1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

16.

Page

HP

546A Logic Pulser 0

546A

Logic Pulser Accessories Available 3

Logic Gate Testing 9

Testing

for

Shorts

10

Multi-pin

Testing

with

Logic

Clip

11

Multi-pin

Testing

with

Logic

Comparator

,.

12

Wire-AND

Node

Fault

14

Gate-to-Gate Faults

15

Pulser Block Diagram

17

Functional

Output

Test

23

"0"

OutputPuIseat5V

Test Setu p

24

"0"

Output

Pulse at 12V Test Setup

26

"1"

Output

Pulse Test Setup

28

Pulser Disassembled

30

Pulser

Component

Locators

35

A1 Logic Pulser Assembly (00546-60002) Series 1644

36

MANUAL

PART

NO.

00546-90005

F/iOW

HEWLETT

PACKARD

P-RINTEDINU.S.A.