Philips PM6303A Service Manual

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PM

ArtekManuals => 2013

6303A

SAFETY

INSTRUCTIONS 1 - 1

1 SAFETY INSTRUCTIONS

1.1

WARNING: These servicing instructions are for use

risk

01

efectric shock, do not perform any servicing other than that specified

Operating Instructions unless you are fully qualified to do so.

Read these pages

The following dauses contain information. cautions and warnings which must safe operation and to retain the instrument shall

carefully before Installation and use of the instrument.

the Instrument

be carried out only

In

a safe

by

qualified personnel.

SAFETY PRECAUTIONS

Forthe correct tollow generally-accepted safety procedures in addition to the safety precautions specified ual. Specific warning and caution statements, where they apply, will Where necessary, the wamlng

and

safe use of this inslrumenlit

and caution statements and/or symbols are

Is

essential that both operating and seMcing personnel

by

condlUon

qualified personnel only.

1.2 CAUTION AND WARNING STATEMENTS

CAUTION:

WARN

ING: Calls attention to a potential danger that requires correct procedures or practices

Is

used

to

Indicate correct operating

damage to or destruction of the equipment or other property.

in

order to prevent personal injury.

or

maintenance procedures in order to prevent

To

reduce the

in

the

be followed to ensure

. Adjustment, maintenance and repair to

In

this man-

be

found throughout the manual.

mar14:ed

on

the apparatus.

1.3 SYMBOLS

Protective earth (black symbol (grounding) terminal

on

1.4 IMPAIRED SAFETY PROTECTION

Whenever tive and be secured against technicians. Safety protection is likely to be Impaired Intended measurements or shows visible damage.

it

is

likely that safety protection has been Impaired, the Instrument must

any

unintended operation. The matter should then

1.5 GENERAL CLAUSES

WARNING: The opening of covers or removal of parts, except those to which access can be

gaines

be

The Instrument shall Bear in mind that capacitors inside the instrument

separated from all voltage sources.

WARNING: Any interruption

or disconnection of the protective earth terminal, is likely to make the Instrument dangerous.

by

hand, is likely to expose live parts and accessible terminals which

dangerous to live.

be

disconnected from

of

the protective earth conductor Inside oroutside the Instrumen t,

Intentional Interruption

all

voltage sources before

can

yellow background)

be

made Inopera-

be

referred to

if

, for example, the Instrument fails to perform the

It

Is opened.

hold their charge even if the instrument has been

Is

prohibited.

qualHfed

can

Components which obtained through your local Philips organlzation (see also chapter 10).

After repair and maintenance in the primary circuit, safety inspection and tests, ter

9,

have to be performed.

are important forthe safety of the instrument may only

be

renewed

as

mentioned

by

oomponents

In

chap-

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PM

ArtekManuals => 2013

6303A

MAINS VOLTAGE SETTING

AND FUSES

2 MAINS VOLTAGE SETTING AND FUSES

2

-1

The safety Instructions

Before Inserting the mains plug

mains

voH:age.

WARNING : If the mains plug has to be adapted to the local sttuation,

On delivery from the factory the Instrument

Type

In

previous chapters must be followed.

Into

the mains socket, make sure that the instrument is set to the local

such adapUon should

is

be

done by a qualified person onty.

set

to

one

Coda no.

of the following mains voltages:

Mains

Delivered

voltage mains cable

PM 6303A PM

6303A

PM

6303A PM6303A PM 6303A 9452

The

set mains vohage and the corresponding

945206303101 945206303103 945206303104 9452

063

03105

063

03106

fU58

220 V Europe, Schuko 120 V North America

240

V England (U.K.)

220

V

240

V

are indicated on the

Switzerland

Australia

rear

panel.

Make sure that only fuses of the required current rating, and of the specified type, are used for renewal.

The

use of repaired fuses and/or the short drcutting of fuse holders are prohibited.

renewed only by a qualtfied person

who

Is aware of the hazard Involved.

The

fuse shall be

WARNING:

Instrument can be

The nom

inal voltages can be selected

the

mains socket.

to replacement of the fuse remove the mains sO'ewdriver (see

Select vised

one

fuse (T0.

drawing

of the vohage range

1A

or TO.2A) into the fuse holder Instead of the one bulb·ln.

The

Instrument shall be disconnected sources Instrument Is

set

to

The

fuse is located In a holder at the

).

when 8 fuse

to

be

the

followtng mains voh.ages:

by

means of the voltage selector, located at

s,

as appropriate, by turning

Is

to

be

replaced

adapted to a different

100

V, 120 V,

same

place .

cable and pry

open

the

selector. If necessary, insert the ad·

from

all vottage

or

when the

mains

vottage.

220

V and

240

the

rear

panel, adjacent

For

mains vohage selection or

the

compartment with a small

V a.c. These

THIS

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PM 6303A

ArtekManuals => 2013

OPERATING AND MEASUREMENT PRINCIPLE

3 OPERATING AND MEASUREMENT PRINCIPLE,

3-1

3.1

BLOCK DIAGRAM, Figs. 1

DESCRIPTION

The

16

MHz

crystal

analog

The

surement frequency ADC .

The

component connection. In the DC BIAS mode 2 V DC are added

The isolating

The current

voltage.

For voltage

over

to

digital converter

frequency

band~pass

test

divider

yoltage

buffer

to

The

conversion factor (gain) can be switched by 8 factor 10.

or

current measurement the input of

by

the

voltage/current

OF

THE

clock

generates the basic frequency for all signals,

ADe

generates the 8 MHz clock pulse for the microprocessor and the 1 kHz mea-

In

3 reference phases

filter

1 converts the

amplifier

senses the voltage at the component.

voltage

amplifies the 1 kHz

converter

BLOCK DIAGRAM, Fig. 3

.

TTL

converts the current through the component Into a proportional

(VII)

selector

to

5

0·.

90-.

or

180·

for

the phase sensitive rectifier and the

signal Into a 1 kHz sinewave signal.

sinewavs

the

controlled by the CPU.

signal to a 2 V open-circuit voltage at the

subsequent

so

to

the

1

kHz

differential

the count pulses for the

signal.

amplifier

is switched

the

programmable

In

the impedance

The 1 kHz

1

kHz

The this value is exceeded, the CPU swHches the programmable ampUllar

The measurement voltage being in-phase with the reference voltage.

The

which can be processed

The

process according to the keyboard setting. computates and stores

fers the result the TRIM

On by the decoder/driver.

band-pass

measurement signal.

level

detector

phase

analog

central

unit 2

sensitive

to

dlgl1al

processing

to

data

.

you

find the backlit

amplifier

of

the component. For reference measurement the Input is short-circuited.

filler

compares the output voltage of band-pass filter 2 wtth a preset reference value.

rectifier

convener

by

unit

gain factors x 0.1, x " or x 10 are selected by

2 suppresses

generates

ADC

the CPU.

CPU with the

hum

interlerence and reduces the harmonic contents on the

DC

voltages which are proportional

converts the output Signal

miaoprooessor

controls and monltores the measurement

of

the rectifier Inlo a binary number

the measurement values and trans-

the

display. It also comprises the

liquid

crystal

non-volatile

display

LCD

memory

wHh

2 backplanes controlled In duplex mode

the

to a lower

to

that component of the

forthe

keyboard settings and

CPU depending on

If

galn factor.

Overmore

The circuitries. It also comprises

power

on

unit 2 you find the

supply

generates

keyboard

the

required stabilized de voltages

the

power-down circuit for the non-volatile

with Its assigned

encoder

+15

.

V,

-15 memory

V,

+5

V, and

.

-5

V for the

3-2

ArtekManuals => 2013

OPERATING

AND

MEASUREMENT PRINCIPLE

PM

6303A

3.2

MEASUREMENT PRINCIPLE

The

component

vohage and after that the component current ara measured and converted into binary values.

nent From these values the

front panel parameter selection, etther the dominant component

(AUTO) - resistance. capadtance or inductance - or the sektcted parameter Each measurement cycle lasts approx.

of

which are stored

The 5 single measurements are

1 . Reference measurement.

Altha beginning of each measurement cycle a reference measurement the programmable amplifier grounded, caused cessor

0315. The

single measurements, necessary for settling of the zero without 1 kHz signal

to the

0103 serves

2.

The

as

O·

voltage at the component

The switchi

measurement

CPU

and

arithmetically evaluated.

programmable amplifier

Is

performed, comprehending all failures within the signal path from multiplexer

AJO

converter. The counter contents of the AID conversion at the end of this measurement

Is

based on the so-called current and vottage technique. The compo-

calculates the ektdrica! parameters at the component. According to the

Is

automatically displayed

Is

displayed.

0.5

as

follows:

S8oonds

is

set to gain xO.

. It comprises 5 singkl measurements, the results

Anal!y

by low

they are transferred

Signals

contr~

PAl, PA2 at pins

1.

After a delay time of 50 ms for each of the

and band-pass fltter 2, B measurement

to

the

display, S98 fig.2.

Is

performed, with the output of

1,

2 of the micro-pro-

reference for the subsequent 4 measurements.

voltage measurement:

is

measured.

ng

phase of the phase sensitive rectifler

Is 0·.

For voltage sensing at the component the Inputs of the differential ampltfter are connected via the VII selector. multiplexer 0101 , to the measurement Input. This is achleved by croprocessor 0315.3. The

progranmatNe ampttfierls set to xO. 1. Atter 5 ms settling time forthe 1 kHz signal the output of the

of the level detector ls sensed, OVR 0315 .12. tectorls sensed again. Is

started, 0315.5. For low-ohmic components the maximum gain

detected, the measurement

90·

3. voltage at the component

The

vottage measurement:

The switching phase of

O·

switching phase is acttvated

tf

no overrange

tf

nowoverrange is detected, the gain

Is

performed.

Is

measured.

the phase sensitive rectifler

Is

90·

by

low

slgnal'sMct

Is

detected, the gain

Is

set backtoxO.l and an

.

The gain of the programmable amplifktr is not shered with respect to the An

AJO

oonverslon is performed.

4.

The The inputs of the differential The switching phase of the phase sensitive rectifter

The gain

o·

current measurement:

current through the component is measured.

ampUfMK'

of

the programmable ampntier is set to

are swttched over to the ouput of the current to

x.

Is 0·.

l and,

as

for voltage measurement. Increased to with regard to the level detector. Next, if necessary, the conversion increased from set back to

xl

to

xl

0 (high at 0315.

xl

after overrange detection. An AID conversion

4)

and the

gatn

of the

prog

.

Is

performed.

ampUfler

kM

xl0

Is

set and, if

O·

coeffk::ient

Is

signal

VIS

4t', 0315.

Is

set to

xl;

AJO

no

v~tage

measurement.

vottage

of the

IN

Inc::reased

to

from the

14

. The gain

the level de-

m~

conversion

overrange

converter.

xl converter is xl

0 and evt.

Is

For low-ohmlc components the sequence

for vottage measurement the gain

If

ing

in maximum current to flow. The current measurement

was

Is

slightly different:

setto

xl

or xl

gain changing.

0,

the Impedance

Is

perfonned at gain xO.l without trial for

Is

In

any case very

low,

result-

ArtekManuals => 2013

PM 6J03A illlIOmahC

ArtekManuals => 2013

I

OO

DO

..

,

0

Fig. 4 Front view

potol

""""

RCl meIer

M<Q

DE

G

B.B.B.B

M,,,,oH

f.

r-it------;

I'IIN."

T

'~

......

l

.~

"YO

AUTO

jX

.rrn-

rp<

R

noz+

fllEO

lUI

Q

..

500

0 .. 0.002

OO

"IN A

"

...

" .....

AUTO 0 0

D D

"

D 0 D

epOfl,p

.

D 0

HH~

IEl

ER

..

c

...

ID

,

L •

•

D

Q - 0 - 1

OC

"

0

81AS

~,

D

.

,....

-

o

@~@r-

O@

~

.,

. .

~

PHILIPS

TAl

lO

D

@-=.

~

<:l'

I

OO

M'NANT.~

0·500

Q

..

0.002

o

.,

500

Q _ 0 .

002

OOMI

N "

N"~

-

jX

Fig. 5 Equivalent-circuit symbol and dominant parameter in the sectors of the

a,. 500

0 .. 0.002

phasor

plane (

AUT

O mode)

3-4

ArtekManuals => 2013

OPERATING AND MEASUREMENT PRINCIPLE PM 6303A

The

following phase diagrams and formulas show the mathematic basics for Internal calculation of the

component

Vq

value

.

--

----

-

--

V

I

V: voltage I: current

Vf. V2: O·

-voltage,

90

" -voltage

I

Iq

-

------e--

<I>

a

I

Vp

Ip

I

VI

The phase angle between I and V The phase angle between I and

V1

is

<p

Is a

In the diagram the phase relation between I and V is related

In

each measurement cycle the following components are determined : Vp, Vq, Ip, Iq.

From these components the series resistance and reactance are calculated.

Vplp

Ip2+

+ Vq Iq

Iq2

(1)

Xs.

jX

Rs

_

The following is valid:

-c:J---fZZJ---

Rs

Quality factor:

0.lon<l>.1/0_

Dissipation factor: 0 _ tan 6 _

The

magnitude of a and the sign of Xs determine which parameter of the component is dominant.

The

formulas for the various parameters are:

XS

1/0

'"

IXsl

Rs Rs

IXs I

<I>

(3)

(4)

to

Vqlp-Vp

Ip2+

Z

6

Rs R

a lossy Inductance.

Iq

Iq2

xs

(2)

tX

0 _

D _ 1

sl

As equation (3)

o

Rp-(1

Rs

+0

see Z

2

x Rs

)

see

equation (1)

-V

2 Xs2

R

- S +

Cp _ -,,--:-:::1'-,;,-,,.,--,-

00(1

(1

Lp

Cs -

Ls - - -

Impedance

Admittance

+

_

'---'----'-'--'-='-

-,-7.:;:-;-

rolXsl IXs I

00

+ 1/0

1/0

00

2

)

2

) IXs I

IXs I

Z _

Y _

R+jX

lIZ

ifXs

< O

ifXs

> O

ifXs<O

ifXs

> O

PM

ArtekManuals => 2013

6303A

Example:

By

means

las 1 and

From

this

OPERATING

of

the 5

measurements

2,

e.g.:

the

instrument

AND

MEASUAEMENT PAINCIPLE

the

instrument

As

• 3.037

Xs.

-15

calculated

:

has

calculated

.197

kll

As

and

Xs

in

accordance

wtth

3-5

formu-

The

instrument

according

The

calculation

to

displays

the

criteria

of

the

dominant

Cpo

0.IXSI.

tne

corresponding

of

the

diagram

equivalent-CirCUit

on

page 3 -4;

Inn,

, LI.LI , n F

DOMINAHT .. C

component

1

w(l

+

l/Q2)IXSI

'1

1

kHz

.,----,-'---:----:--;;-----.10

2n

Cp

(1

+ 1/5.004

As

was

.

5

OO4

In

this

case,

~

AUTO

done

according

2

)

'15.197

symbOl

as

FREQ

kll

wittl the

Xs

is

negative

1kHz

to

the

.068 nF

dominant

formula

component,

and

1 < Q <

:

500

:

whereby tolerance

The

D •

the .

calculation

..!... • ----L-

o 5.004

Ap.

As _

3.037

z •

Cs • .......,,;,-,

CP

: The

tan

CI>

and

gets

4>.

-78

2

(1

+ 0

kQ

~AS2

XsI

w l

Instrument

_

~

As

CI>

from

.7

DEG

instrument

01

)

'As

(calculated

+Xs

-

_ 15.197 kO _ 5,004

an Intemal

calculates

the

further

.0

.

(1

2 •

2n·'

calculates

3.037

selectable

.199

+ 5.0042) '3.037

by

~(3.037kll)2

kHz

kSl

t~e

at a higher

the instrument ace. to formula 1)

+(15.197 kll)2

·15.197kC

resolution.

parameters

kll

.79

.10.472

The

are

pertormed

.08 kG

_15.497kll

nF

maximum

as

follows

disp'ay

:

is 4 digits

± 1

digit

3-6

ArtekManuals => 2013

Cp

rC-r:J

Rp

OPERATING AND MEASUREMENT PRINCIPLE PM 6303A

y -

1 . C

Rp

+

Jto

P

Z_

Rp (1 1 + (wCpRp

Iw

CpRp)

)2

jX

/WC

~

IX

~

Cs

Rs

D _

wCpRp

P

Cs

_

(1

+ D

lI

Rp

R 1 + 0

R . 1

Z _

Rs

R

W~S

Z

0 _

Cp _

S-

wCsRs

1 + 0

1

I--

1

2) X Cp

w

CS

x Cs

2

Rs-

Rp _

D2

1 + 0

D2

x Rp

2

X

Rs

~

!.s

jX

/

Rp

c:vv:t:J

Lp

jX

~

Z .

As+jwLs

D_~

w!.s

W!.s

Lp

_ (1 + D

As R

y-

0 _ w

lI

Rp

R

l

/

wlP

Y

!.s _

1 1

-

Rp

1+0

Lp

2) X Cp

-j

-

1

2x

wLp

Lp

Rp _

Z _

Rs_

1 + 0

D2

Rp (1 + IRp/wLp)

1 + (RplwLp) 2

D2

1

+02 xRp

2

X

Rs

THIS

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INSERTED

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Philips PM6303A Service Manual

ArtekManuals

CONTENTS

SAFETY

MEASUREMENT PRINCIPLE