HP 547A Service-Handbuch

CERTIFICATION

Hewlett-Packard Company certifies that this instrument met its published specifications

at the time

shipment from the factory. Hewlett-Packard Company further certifies that

its calibration measurements are traceable to the United States National Bureau

Standards,

the extent allowed by the Bureau's calibration facility, and to the calibration

facilities

other International Standards Organization members.

WARRANTY AND ASSISTANCE

This Hewlett-Packard product

warranted against defects in materials and workmanship

for a period of one year from the date of shipment. Hewlett-Packard will, at its option,

repair

replace products which prove to

defective during the warranty period pro-

vided they are returned to Hewlett-Packard, and provided the preventive maintenance

procedures in this manual are followed. Repairs necessitated by misuse

the product

are not covered by this warranty.

OTHER WARRANTIES ARE

EXPRESSED

IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF

MERCHANTABILITY AND FITNESS

FOR

A PARTICULAR

PURPOSE.

HEWLETT-

PACKARD

NOT LIABLE

FOR

CONSEQUENTIAL DAMAGES.

Service contracts

customer assistance agreements are available

for

Hewlett-Packard

products.

For any assistance, contact your nearest Hewlett-Packard Sales and Service Office.

Addresses are provided at the back of this manual.

CURRENT

TRACER

547A

OPERATING

AND

SERVICE

MANUAL

SERIAL

NUMBER:

AOOOS1

and above

This manual refers directly to

Model

547A

Current Tracers with Serial

numbers

A00051.

NEWER

INSTRUMENTS

The changes in Current Tracers with Serial numbers higher than

A00051

are described in "Change Sheets" included with the manual.

HEWLETT-PACKARD

COMPANY

1976

5301

STEVENS

CREEK

BLVD.,

SANTA

CLARA,

CALIF.

95050

Manual Part No. 00547-90006

Microfiche Part No. 00547-90007

Printed:

JAN

1978

Printed in U.S.A.

FJ/o-

HEWLETT

a:t:.

PACKARD

Modei547A

TABLE

CONTENTS

Tide

Page

Scope of Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Instrument Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Unpacking and Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Storage and Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Operating Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Current Tracer

Operation

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Theory of

Operation

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Performance Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Table

LIST

TABLES

Page

Model

547A

Current

Tracer Specifications . .. . . .. . . . . .. . . . .. . . . .. . . .

. . . .. . . .. . 2

Replaceable Parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Manufacturers

Code

list

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

Page

Figure

LIST

FIGURES

Page

Model

547A

Current

Tracer

......

. .

......

....

Wire-AND

Node

Fault . . . . . . . . . . . . •. . . •••. •. . . . . . . . . . . . . . . . . . . . . . . •. . . . . . . . . . . 4

Gate-to-Gate Faults . . . . . . •. . . . . . . . . . . . . . . . . . . . •. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Solder-Bridge in Printed-Circuit . . . . . . . . . . . . . . ••. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Multiple

Gate Inputs . . . . . . •. . . . . . . . . . . . . •. . •. •. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Exploded View

Current Tracer . . . . . . . . . . . . . . . . . . . . •. . . . . . . . . . •. •. •. . . . . .

. . 7

Setup

for

1 rnA Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Setup

for

1 A Test

.....•.....•............•...................................

Schematic Diagram . . . . . . . . . . . . . . . . . . . . . . •••. . . . . . . . . . . . •. . •. . . . . . . . . •. . . . . . . .

Model

547A

Page 1

Figure

Model

547A

Current

Tracer

SCOPE

MANUAL

This manual contains information about the Hewlett-Packard

547A

Current Tracer. Coverage includes a description

of the instrument, its applications, specifications, instructions in

its

use, theory

operation, maintenance, perform-

ance tests, adjustments, list

replaceable parts and how

obtain them, component locators, and schematics.

DESCRIPTION

The

547A

Current Tracer

a hand-held probe which enables the precise localization

low-impedance faults

in electrical systems. The probe

senses

the magnetic field generated by a pulsing current internal to the circuit

by current pulses supplied by

external stimulus

such

the

546A

10526T

Logic Pulsers. Indication

the

presence

current pulses

provided by lighting the indicator lamp near the Current Tracer tip. Adjustment of

probe sensitivity over the 1 mA

1A range

provided by the

SENSITIVITY

control near the indicator. The probe

self-contained and requires <75 mA at 4.5V

18V, from any convenient source.

INSTRUMENT

IDENTIFICATION

Hewlett-Packard

uses

6-digit

serial number

(AOOOOO)

identify the Current Tracer.

the serial number of

your instrument differs from

the

serial number(s) on the title page

this manual, there are other differences

between the manual and your instrument.

These

differences are covered in a

"MANUAL

CHANGES" sheet

which

included with the manual.

Model

547A

SPECIFICATIONS

Table 1 lists

all

specifications for

Model

547A

Current

Tracer.

Table

Model

547A

Current Tracer Specifications

INPUT:

Sensitivity: 1

rnA

Frequency Response:

light

indicates Single-step

current

transitions: single pulses

2:50

width; pulse trains

MHz (typically

MHz for current pulses

2:10

rnA)

Risetime: Light indicates

current

transitions with risetimes

:>.200

ns at 1

rnA.

POWER

SUPPLY

REQUIREMENTS:

Voltage: 4.5

Vdc

Input

Current:

rnA

Maximum Ripple: ±500

above 5 Vdc

Overvoltage Protection: ±25 Vdc for

one

minute

TEMPERATURE: 0°

55°C

WEIGHT: 113.4 g

oz.) net; Shipping Weight:

170

oz).

Size

Probe

body 15.24 em

in.); Cable, 110.38 em

(47

in.)

Page

200

n5 2 1'5

1'5

200

1'5

INPUT PULSE RISETIME

APPLICATIONS

The

Current

Tracer

operates

the

principle that whatever

driving a

low-impedance

fault

node

must

de-

livering

the

majority

the

current.

Tracing

the

path of this

current

leads directly

the

fault. Prob\ems

that

are

compatible with this

method

are:

a. Shorted inputs of integrated circuits.

b. Solder-bridges

printed-circuit

boards.

c. Shorted

conductors

cables.

d. Shorts

voltage distribution networks,

e.g.,

Vee-to-ground

shorts.

e. Stuck data buses, such

three

state,

open-collector,

Hewlett-Packard Interface

Bus

(HP-IB).

Stuck wire-AND structure.

UNPACKING

AND

INSPECTION

the

shipping carton

damaged,

ask that

the

carrier's agent

present

when

the

Current

Tracer

unpacked.

Inspect

the

instrument for obvious

damage

such

dents, scratches, etc.

the

instrument

damaged or

fails

meet

performance tests, notify

the

carrier

and

the

nearest Hewlett-Packard Sales and Service Office immediately.

Retain

the

shipping carton and

the

padding

material for

the

carrier's inspection. The Sales and Service Office

will

arrange for

the

repair

replacement

the

instrument without waiting for

the

claim against

the

carrier

settled.

STORAGE

AND

SHIPMENT

protect

valuable electronic

equipment

during storage

shipment, always use

the

best packaging methods avail-

able. Your Hewlett-Packard Sales

and

Service Office can provide packaging material such

that used for original

Modei547A

Page 3

factory packaging. Contract packaging companies in many cities

can

provide dependable custom packaging on

short notice. Environmental conditions during storage and shipment should normally be limited

follows:

Maximum altitude: 25,000 ft.

Minimum

temperature: -40°F (-40°C).

c. Maximum temperature: +149°F (+65°C).

OPERATING

CHARACTERISTICS

Three conditions must be met before the Current Tracer

can

properly respond

circuit stimulus:

The mark on the probe's tip must be aligned along the length

the printed-circuit trace.

The probe be held perpendicular

the printed-circuit trace -not

angle.

3. The printed-circuit trace must be conducting

alternating current, either from

internal source or,

from

external stimulus such

a Logic Pulser with a rise-time

~200

ns.

NOTE

The

voltage present on the

black

power

supply

lead

(negative side of

supply)

also

present on the

tracer's

anodized

aluminum

case. Do not

lay

the

tracer

any

grounded

area,

such

instrument

chassis,

unless

the

chassis

the

same

potential

the

black

lead.

Damage

to the

power

supply

may

result.

CURRENT

TRACER

OPERATION

Use

the Current Tracer

indicated when conventional troubleshooting reveals a low-impedance fal.lft. The

operator aligns the mark on the probe

tip

along the length of the printed-circuit trace

the driver and adjusts

the sensitivity control until the indicator lamp just lights. The probe

then moved along the trace

placed

directly on the terminal points

the nodes (or IC pins), while observing the indicator light. This method

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