Philips PM 6303 Bedienungsanleitung

RCL

meter

6303

9452

063

03001

Service

manual

9499

525

00911

8403

01/1

PHILIPS

Please

note

correspondence

concerning

this

instrument,

please

quote

the

type

number

and

serial

number

given

the

type

plate.

Bitte

beachten

Bei

Schriftwechsel

iiber

dieses

Gerat

wird

gebeten,

die

Typennummer

und

die

Geratenummer

anzugeben.

Diese

befinden

sich

auf

dem

Typenschild

der

Riickseite

des

Gerates.

Noter

Dans

votre

correspondance

dans

vos

réclamations

rapportant

cet

appareil,

veuillez

toujours

indiquer

numéro

type

numéro

série

qui

sont

marqués

sur

plaquette

caractéristiques.

Important

the

instrument

electrical

apparatus,

may

operated

only

trained

personnel.

Maintenance

and

repairs

may

also

carried

out

only

qualified

personnel.

Wichtig

das

Gerat

ein

elektrisches

Betriebsmittel

ist,

darf

die

Bedienung

nur

durch

eingewiesenes

Personal

erfolgen.

Wartung

und

Reparatur

diirfen

nur

von

geschultem,

fach-

und

sachkundigem

Personal

durchgefiihrt

werden.

important

Comme

I'instrument

est

équipement

électrique,

service

doit

@tre

assuré

par

personnel

qualifié.

méme,

I’entretien

les

réparations

sont

confier

aux

personnes

suffisement

qualifiées.

(c)

Philips

GmbH

—

Hamburg

—

Germany

—

1984

All

rights

are

strictly

reserved.

Reproduction

divulgation

any

form

whatsoever

not

permitted

without

written

authority

from

the

owner.

Issued

Philips

GmbH

-Unternehmensbereich

Elektronik

fiir

Wissenschaft

und

Industrie-

Werk

fir

MeBtechnik

Printed

Germany

0-3

CONTENTS

SAFETY

INSTRUCTIONS

1.1.

Safety

precautions

1.2.

Caution

and

warning

statements

1.3.

Symbols

1.4.

Impaired

safety-protection

1.5.

General

clauses

OPERATING

PRINCIPLE

2.1.

Description

the

block

diagram

2.2.

Measuring

principle

Fig.

One

single

measurement

Fig.

One

measurement

cycle

Fig.

Block

diagram

Fig.

Front

view

CIRCUIT

DESCRIPTION,

FAULT

FINDING,

with

figs.

-13

3.1.

Crystal

clock,

frequency

divider,phase

selector

3.2.

Component

connection,

buffer,

inverting

amplifier

3.3.

Current

voltage

converter

3.4.

Programmable

amplifier

3.5.

Band-pass

filter

3.6.

Level

detector

3.7.

Phase

sensitive

rectifier

3.8.

Analog

digital

converter,

ADC

3.9.

Central

processing

unit,

CPU

3.10.

Parameter

selection

3.11.

Liquid-crystal

display,

LCD

3.12.

Power

supply

3.13.

Self-test

program,

Error

messages

3.14.

Diagnostic

program

ACCESS

PARTS

4.1.

Dismantling

the

cabinet

4.2.

Unit

display

unit

4.3.

Pushbuttons

4.4.

Carrying

handle

PERFORMANCE

CHECK

5.1.

General

information

5.2.

General

functional

test

CHECKING

AND

ADJUSTING

6.1.

General

information

6.2.

Recommended

test

equipment

6.3.

Table

checks

and

adjustments

1-1

2-1

2-2

2-3

2-4

4-1

5-1

6-1

6-2

7.1.

7.2.

7.3.

7.4.

8.1.

8.2.

8.3.

8.4.

Fig.

Fig

10.

11.

.17

Fig.

0-4

SAFETY

INSPECTION

AND

TESTS

AFTER

REPAIR

AND

MAINTENANCE

THE

PRIMARY

CIRCUIT

General

directives

Safety

components

Checking

the

protective

earth

connection

Checking

the

insulation

resistance

SPARE

PARTS

General

Static

sensitive

components

Handling

MOS

devices

Parts

list

FIGURES

Handle:

spare

parts

Mains

cable:

spare

parts

Unit

component

lay-outs

Unit

circuit

diagrams

CODING

SYSTEM

FAILURE

REPORTING

FOR

QUALITY

ADDRESSES

FOR

SALES

AND

SERVICE

7-1

8-1

8-2

1.1.

1.2.

1.3.

1.4,

1.5.

1.5.1.

1.5.2.

1.5.3.

1.5.4.

1.5.5.

1.5.6.

SAFETY

INSTRUCTIONS

WARNING:

These

servicing

instructions

are

use

qualified

personnel

only.

reduce

the

risk

electric

shock,

not

perform

any

servicing

other

then

that

specified

the

Operating

Instructions

unless

you

are

fully

qualified

so.

Read

these

pages

carefully

before

installation

and

use

the

instrument.

‘The

following

clauses

contain

information,

cautions

and

warnings

which

must

followed

ensure

safe

operation

and

retain

the

instrument

safe

condition.

Adjustment,

maintenance

and

repair

the

instrument

shall

carried

out

only

qualified

personnel.

SAFETY

PRECAUTIONS

For

the

correct

and

safe

use

this

instrument

essential

that

both

operating

and

servicing

personnel

generally-accepted

safety

procedures

addition

the

safety

precautions

specified

this

manual.

Specific

warning

and

caution

statements,

where

they

apply,

will

found

throughout

the

manual.

Where

necessary,

the

warning

and

caution

statements

and/or

symbols

are

marked

the

apparatus.

CAUTION

AND

WARNING

STATEMENTS

CAUTION:

used

indicate

correct

operating

maintenance

procedures

order

prevent

damage

de-

struction

the

equipment

other

property.

WARNING:

Calls

attention

potential

danger

that

requires

correct

procedures

practices

order

prevent

personal

injury.

SYMBOLS

Protective

earth

(black)

(grounding)

terminal

IMPAIRED

SAFETY—PROTECTION

Whenever

it is

likely

that

safety-protection

has

been

impaired,

the

instrument

must

made

inoperative

and

secured

against

any

unintended

operation.

The

matter

should

then

referred

qualified

technicians.

Safety

protection

likely

impaired

if,

for

example,

the

instrument

fails

perform

the

intenced

measurements

shows

visible

damage.

GENERAL

CLAUSES

WARNING:

The

opening

covers

removal

parts,

except

those

which

access

can

gained

hand,

likey

expose

live

parts

and

accessible

terminals

which

can

dangerous

live.

The

instrument

shall

disconnected

from

all

voltage

sources

before

it is

opened.

Bear

mind

that

capacitors

inside

the

instrument

can

hold

their

charge

even

the

instrument

has

bein

separated

from

all

voltage

sources.

WARNING:

Any

interruption

the

protective

earth

conductor

inside

outside

the

instrument,

disconnection

the

protective

earth

terminal,

likely

make

the

instrument

dangerous.

Intentional

interruption

prohibited.

Components

which

are

important

for

the

safety

the

instrument

may

only

renewed

componerts

obtained

through

your

local

Philips

organisation

(see

also

chapter

8).

After

repair

and

maintenance

the

primary

circuit,

safety

inspection

and

tests,

mentioned

chapier”

have

performed.

2.1.

2-1

OPERATING

PRINCIPLE

DESCRIPTION

THE

BLOCK

DIAGRAM,

Fig.

The

MHz

crystal

clock

generates

the

basic

frequency

for

all

signals,

the

count

pulses

for

the

analog

digital

converter

ADC.

The

frequency

divider

generates

the

MHz

clock

pulse

for

the

microprocessor

and

the

kHz

test

fre-

quency

reference

phases,

namely

0°,

90°

and

180°.

the

phase

selector

the

CPU

selects

the

appropriate

reference

phase

0°,

90°

180°

for

the

phase

sensitive

rectifier

and

the

ADC.

The

band-pass

filter

converts

the

TTL

signal

into

kHz

sine

wave

signal.

The

test

voltage

amplifier

_amplifies

the

kHz

sine

wave

signal

Veff

open

circuit

voltage

the

component

under

test

(CUT)

connection.

the

‘Cs

biased’

mode

Vdc

are

added

the

kHz

signal.

‘

The

isolating

buffer

senses

the

voitage

the

CUT.

The

inverting

amplifier

feeds

compensating

current

via

capacitor

(90°

phase

shift)

into

the

current

voltage

converter

input

for

equalizing

the

stray

capacitances.

The

amplitude

the

compensating

current

set

TRIM.

The

current

voltage

converter

converts

the

current

through

the

CUT

into

proportional

voltage.

The

conversion

factor

can

switched

factor

10.

For

current

voltage

measurement

the

input

the

subsequent

differential

amplifier

switched

over

the

voltage/current

(V/l)

selector

controlled

the

CPU.

the

programmable

amplifier

gain

factors

x0.1,

x10

are

selected

the

CPU

depending

the

impedance

the

CUT.

For

the

reference

measurement

the

input

short-circuited.

The

kHz

band-pass

filter

suppresses

hum

interference

and

reduces

the

harmonic

components

the

kHz

measurement

signal.

The

level

detector

compares

the

output

voltage

band

filter

with

preset

reference

value.

this

value

exceeded,

the

CPU

switches

the

programmable

amplifier

lower

gain

factor.

The

phase

sensitive

rectifier

generates

voltages

which

are

proportional

that

component

the

measuring

voltage

being

in-phase

with

the

reference

voltage.

The

analog

digital

converter

ADC

converts

the

output

signal

the

rectifier

into

binary

number

which

can

processed

the

CPU.

The

central

processing

unit

CPU

with

the

inherent

microprocessor

controls

and

monitores

the

measu-

rement

process,

computates

and

stores

the

measurement

values

and

transfers

the

result

the

display.

The

LCD

control

transforms

the

serial

data

transmitted

the

CPU

into

parallel

data

and

contrds

the

liquid-crystal

display

which

operates

duplex

mode.

the

LED

control

the

parameter

key

actuations

are

verified

and

processed.

The

selected

parametr

indicated

LED.

Simultaneously

the

information

BCD-coded

and

sent

the

CPU,

whereby

the

most

significant

bit

directly

switches

the

Vdc

voltage,

when

the

parameter

Bias)

set.

The

power

supply

generates

the

required

stabilized

voltages

+15

-15

and

for

the

circuitrie.

2.2.

2-2

MEASURING

PRINCIPLE,

Figs.

The

measurement

principle

based

the

so-called

current

and

voltage

measurement

technique:

the

component

voltage

and

after

that

the

component

current

are

measured.

The

measured

values

are

con-

verted

binary

numbers.

From

these

numbers

the

CPU

computes

the

CUT

parameter

interest.

According

the

front

panel

parameter

selection,

either

the

dominating

component

—resistance,

capa-

citance

inductance—

one

the

other

selectable

parameters

displayed.

Each

measurement

cycle

lasts

approx.

0.5

comprises

single

measurements,

the

results

which

are

stored

the

microprocessor

data

memory,

subsequent

arithmetic

evaluation

and

final

transfer

the

result

the

display.

The

single

measurements

are

follows:

Reference

measurement:

the

beginning

each

measurement

cycle

reference

measurement

performed,

with

the

input

the

programmable

amplifier

short-circuited,

caused

low

signal

pins

27,

the

microprocessor

309.

The

programmable

amplifier

set

gain

x.1.

After

delay

time

for

each

the

single

measurements,

necessary

for

settling

the

zero

control

and

the

band-pass

filter

measurement

without

kHz

signal

performed,

comprehending

all

failures

within

the

signal

path

from

FET

switch

328

the

A/D

converter.

The

counter

contents

the

A/D

conversion

the

end

this

measurement

serves

reference

for

the

subsequent

measurements.

0°

voltage

measurement:

The

voltage

the

CUT

measured.

The

switching

phase

the

phase

sensitive

rectifier

O°.

For

voltage

sensing

the

CUT

the

inputs

the

differential

amplifier

are

connected

via

the

V/\

selector,

FET

switch

324,

the

measurement

input.

This

achieved

low

signal

the

microprocessor

309.30.

The

0°

switching

phase

activated

low

signal

309.33.

The

gain

the

programmable

amplifier

set

x.1.

After

settling

time

for

the

kHz

signal

amplitude

the

output

the

level

detector

sensed,

INT,

309.6.

overrange

detected

—correct

for

the

100

resistor

our

example—

the

gain

set

x1;

the

level

detector

sensed

again.

now

overrange

detected

the

gain

set

back

x.land

anA/D

conversion

started,

309.31.

For

low-ohmic

CUTs

the

gain

set

maximum

gain

x10

and,

overrange

detected,

the

measurement

performed.

90°

voltage

measurement:

The

voltage

the

CUT

measured.

The

switching

phase

the

phase

sensitive

rectifier

90°.

The

gain

the

programmable

amplifier

not

altered

with

respect

the

0°

voltage

measurement.

A/D

conversion

performed.

0°

current

measurement:

The

inputs

the

differential

amplifier

are

switched

over

the

output

the

current

voltage

conver-

ter.

;

The

current

through

the

CUT

measured.

The

switching

phase

the

phase

sensitive

rectifier

0°.

The

gain

the

programmable

amplifier

set

to.x.1

and,

for

voltage

measurement,

increased

with

regard

the

level

detector.

Next,

necessary,

the

conversion

coefficient

the

I/V

converter

increased

from

x10

(high

309.30)

and

—as

valid

for

our

example

with

100

resistor—

the

gain

the

programmable

amplifier

increased

x10

and

set

back

after

overrange

detection.

A/D

conversion

performed.

For

low-ohmic

components

slightly

different

sequence

performed:

for

voltage

measurement

the

gain

was

set

x10,

the

impedance

any

case

very

low,

resulting

maximum

current

flow.

The

current

measurement

performed

gain

x.1

without

trial

for

gain

changing.

90°

current

measurement:

The

current

through

the

CUT

measured.

The

switching

phase

the

phase

sensitive

rectifier

90°.

The

gain

the

programmable

amplifier

not

altered.

final

A/D

conversion

performed.

the

end

the

single

measurements

the

corresponding

binary

numbers

the

A/D

conversions

and

the

assigned

gain

factors

are

stored

the

microprocessor

data

memory.

From

this

the

micropro-

cessor

first

calculates

the

equivalent

series

resistance

Rs,

the

equivalent

series

reactance

and

the

quality

factor

Xs/Rs

the

CUT.

the

RCL

AUTO

mode

the

microprocessor

determines

the

dominant

component,

either

resp.

Rp,

Ls,

calculates

its

value,

dimension

and

equivalent-

circuit

symbol

arithmetic

routines

and

transfers

the

result

the

display.

one

the

other

para-

meters

selected

the

step

keys

this

parameter

calculated

and

displayed.

After

that

the

micropro-

cessor

starts

the

measurement

cycle

with

the

single

measurement

routines.

For

fault

finding

the

single

measurements

can

statically

controlled,

performed

the

diagnostic

program,

see

chapter

3.14.

0°/90°

VII

gain

delay

time

A/D

con-

storage

selection

setting

version

data

memory

Fig.

One

single

measurement

Xs,

Rs,

data

for-

computation

parameter

value

matting

averaging

verification

computation

transfer

displa

Fig.

One

measurement

cycle

(ca.

0.5

phase

selector

90°

416

MHz

frequency

band-pass

crystal

divider

filter

clock

TkHz

kHz

GUARD

MHz

1/select

bias

CPU

/off

+15V

-15V

+5V

power

supply

(2V

BIAS)

LED

control

parameter

selection

CPU

central

processing

unit

L___-4

RcLauTo

display

curr.

volt.

band-pass

33]

csbay

converter

fitter

sensitive

pie

ei,

/x1/x10

1kHz

rectifier

843

clock,

load,

-~@

RCL

AUTO

—

level

gain,

detector

11—~

data

from

inhibit

for

counter

SENSE

—

SENSE

;

BIAS

ref.

meas.

overrange

carry

from

QRs

counter,

end

jit

integr.

L—-

asc

;

integration

®Cs

ork

component

under

test

start

/reset

rks

{

POWER}

-/--

step

Sane

TRIM

hee

step

down

Fig.

Block

diagram

6303

REL

BHILIPS

Fig.

Front

view

3.1.

CIRCUIT

DESCRIPTION,

FAULT

FINDING

CRYSTAL

CLOCK,

FREQUENCY

DIVIDER,

PHASE

SELECTOR

The

accuracy

the

MHz

clock

frequency

moderate,

+5-

10°75.

fixed

load

capacitances

506,

504

are

inserted;

they

nevertheless

may

altered

test,

necessary.

The

output

the

oscillator

decoup-

led

inverter

307/2.

307/1

feeds

the

MHz

count

pulses

for

the

analog

digital

converter

ADC.

The

first

divider

stage

the

4-bit

binary

counter

308

generates

the

MHz

clock

pulse

for

the

micro-

processor.

Its

last

stage

feeds

MHz

the

frequency

divider

chain.

306

comprises

two

4-bit

BCD

counters,

the

division

which

used

for

dividing

the

frequency

down

kHz.

Further

division

results

kHz

signal

output

304.9,

the

basic

frequency

for

generation

the

kHz

signals

with

different

phase

relations,

see

fig.

The

trailing

(high

low)

edges

trigger

the

J—K

flipflops

303,

302.

The

kHz

signal,

phase

0°,

fed

the

band-pass

filter

the

output

the

multiplexer

301

0°

90°

signal

available,

selected

(‘select

y’)

the

microprocessor.

output

signal

shifted

90°

with

relation

available

for

synchronisation

the

analog

digital

converter

ADC.

SOG

tee

{

aes

302/15

Sima

sete

eer

kHz

{

302/1.6

ereearaa

(Se

Sane

——w}

250s

ego

Ims

Fig.5

Generation

the

kHz

signals

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